Contain all the articles from this issueICEEM /02 PLENARY SESSION:"Environmental Engineering and Management in the Context of Sustainable Development"Design for sustainability (D4S): towards advanced product conceptsHan Brezet, Sacha SilvesterICEEM/02 - ENVIRONMENTAL ENGINEERING SECTION"Water and Wastewater Treatment Technologies"Complex approach to the problem of persistent organic pollutants degradation in water environmentVictor Covaliov, Olga Covaliova, Angela Cincilei, Gilles Mailhot, Pasca...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25176

Include urmatoarele articole:� Cost sensitivity analysis by Monte Carlo simulation� Mathematical modeling of gas drying by adsorption� Methyl isobutyl ketone combustion over Pt/Al2O3 catalyst� Distribution of oxygen transfer rate in stirred bioreactors with simulated broths� Unsteady heat transfer inside an elliptic cylinder� Triphasic external-loop airlift reactors. Hydrodynamic and dispersion studies� Sustainable combined utilization of renewable forest resources and coal in Roma...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25209

AbstractThis paper presents an overview of research related to use of surfactant modified natural zeolites (SMZ) in water and wastewater treatment. The most common natural zeolite, widely used as starting material is clinoptilolite, but other natural zeolites have also been used (chabasite, heulandite, mordenite). In the first part, the preparation methods and the influence of process parameters on the final product properties is reviewed. The discussion is focused on the influence of surfactant...
Autori: , Cezar Catrinescu, Roxana Elena Apreutesei
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25241

AbstractLaboratory scale experiments were conducted in order to investigate the photolysis of Reactive Blue 19 (RB 19) dye using UV as the irradiation source in alkaline solution. The effects of operating parameters such as, pH, initial dye concentration, UV dosage, hydrogen peroxide and oxygen have been evaluated. The results indicate that the UV photolysis process in alkaline solution is ideal for decolorizing of RB 19 and it can be taken as a starting step to establish the economical feasibil...
Autori: Abbas Rezaee, Ebrahim Hajizadeh, Gholamreza Mosavi, Mohamadtaghi Ghaneian, Seyyed Jamalodin Hashemian
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25245

AbstractEquilibrium and kinetic studies regarding the sorption of the copper phtalocyanine dye Alcian Blue 8 GX were carried-out within batch experiments. The sorption equilibrium revealed that the pure natural clay can uptake up to 18 mg of Alcian Blue 8 GX per 1 g mass of clay. The cationic dye sorption was best fitted by Freundlich model that is applicable to sorption on heterogeneous surfaces (surfaces with non-equivalent energetic sites). The pseudo-second order kinetic model may be efficie...
Autori: , Maria Gavrilescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25257

AbstractThe paper proposes a suitable solution for a one step treatment process of the wastewaters resulted from the textile industry, using a mixture of anatase and modified fly ash. The dyes photo-degradation on TiO2 anatase is well known. The use of fly ash in advanced wastewater treatment, for heavy metal adsorption, represents an environmental friendly process, efficient if the fly ash surface charge is controlled by solubilisation/reprecipitation. The first step in implementing the single ...
Autori: Anca Duta, Maria Visa
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25292

â€? Bioremediation of contaminated air using a bioscrubberâ€? Quality risk evaluation of the groundwater resources on the moldavian areaâ€? Electrochemical characterization of some dental materials in accelerated environmental testingâ€? Preliminary study of simple and Fenton oxidation with hydrogen peroxide applied on final effluents from a zootechnical farmâ€? The environmental impact assessment caused by the dykes failureâ€? Revaluation of beer industry byproducts – medical implicationsâ€? ...
Autori: http://www.ecozone.ro/reviste.php?RID=25372

Abstract Textile industry is one of the most pollutant and water consuming industries. Large quantities of water are required in materials preparation and dyeing, so consumption and waste generation have become serious concerns for textile manufacturers and finishers. Textile effluents are characterized by high values of quality indicators such as BOD and COD, suspended solids and heavy metals. A serious environmental problem and also an aesthetic problem is the color of the effluent. Reactiv...
Autori: Daniela Cailean, George Barjoveanu, Corina - Petronela Musteret, Liliana Rozemarie Manea, Nicolae Sulitanu,
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25420

Abstract The use of fly ash (FA) in wastewater treatment received a lot of attention for the immobilization of heavy metal cations, mainly Cd2+, Pb2+, Ni2+, Zn2+, Cu2+. For an up-scalable wastewater treatment process, the substrate must have good adsorption efficiency and relatively constant behaviour. Modifying the fly ash surface can be a solution for reaching both goals. The use of FA for heavy metals removal, from wastewaters resulted in the dye finishing industry, faces a supplementary p...
Autori: Maria Visa, Anca Duta
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25471

Abstract The paper presents the results obtained when using thin films (doctor blade) of titanium oxide powder (Degussa P25) and fly ashactivated with NaOH, for advanced treatment of complex waters resulted in the textile industry. There are studied the heavy metal(cadmium, copper) adsorption and the dyes (methyl orange and methylene blue) photo-degradation using these novel substrates.The thin films crystallinity (XRD), morphology and roughness (AFM) were evaluated and no significant changes...
Autori: Anca Duta, Luminita Andronic, Maria Visa
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25500

Abstract The individual physical, chemical, and biological interactions that determine the exposure of plants and animals to chemicals associated with soils are of great importance in the assessment of contaminants bioavailability. Understanding of bioavailability processes is at last needed to improve the scientific basis of risk assessment and is the purpose of the present research. Since bioavailability processes are embedded within existing human health and ecological risk frameworks, so...
Autori: Brindusa Mihaela Robu, Camelia Smaranda, Florentina Anca Căliman, Laura Carmen Apostol, Lucian Vasile Pavel, Maria Gavrilescu, Raluca Maria Hlihor
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25516

Abstract Sorption is one of the several methods that have been successfully utilized for dyes removal. A large number of materials have been used as suitable sorbents for decolourization of industrial effluents: activated carbon (the most common but expensive adsorbent), polymeric resins, various low-cost adsorbents (agricultural and industrial by-products, peat, chitin, silica, bentonite, other clays, fly ash). Our paper is a review about our researches regarding different types of industri...
Autori: Daniela Suteu, Carmen Zaharia, Augustin Muresan, Rodica Muresan, Alina Popescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25532

Abstract Tartrazine, (CI 19140) is an azo dye widely used in pharmaceuticals, cosmetics and foodstuff, as well as for coloring the textiles, hence it can be easily found in municipal wastewaters or wastewaters originating from textile, food, drugs and cosmetic industry. In this work, the capacity of a Romanian soil to retain Tartrazine from aqueous solution by sorption onto soil particles of different size has been investigated. The sorption kinetics was studied by applying five kinetic model...
Autori: Florentina Anca Căliman, Laura Carmen Apostol, Dumitru Bulgariu, Laura Bulgariu, Maria Gavrilescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25534

Abstract In the textile finishing and dyeing industries, the total volume of water consumed is around 150 millions tons/year, and thus very large quantities of water are processed and produced as wastewater by textile plants. Quality indicators of textile wastewaters, like BOD and COD, have values which, in some cases, exceed 5 times the maximum concentration value (allowed by the national quality standards). One of the greatest concerns in wastewater treatment of a textile effluent is the co...
Autori: Daniela Cailean, , Florin Brinza
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25538

Abstract The textile wastewaters have a diverse composition depending both on the used raw materials and applied manufacturing technologies. These wastewaters may contain various pollutants such as organic compounds (e.g. residual dyes), suspended solids, metal ions etc. Most of dyes are synthetic compounds with aromatic molecular structures and non-biodegradable. The oxidative destruction via homogenous oxidation processes with hydrogen peroxide (simple chemical oxidation with H2O2 or advanc...
Autori: Carmen Zaharia, Daniela Suteu, Augustin Muresan, Rodica Muresan, Alina Popescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25570

Abstract Wastewaters of textile and leather dying industries contain significant quantities of water-soluble dyes. Moreover the temperature and pH of these wastewaters may be controlling variables affecting the biosorption performance. In this study the sorption of dark blue dye by Aspergillus biomass and peat was studied as a function of temperature, initial dye concentration, and initial pH values. In addition, the effects of sorbent dosage on the sorption processes were systematically stud...
Autori: Cornel Cojocaru, Cornel Pohontu, Igor Creţescu, Mariana Diaconu, Roxana Elena Benchea
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25587

Abstract The use of biomaterials as biosorbents for treatment of wastewaters will provide as a potential alternate to the conventional treatment methods. The main advantages of biosorption are high selectivity , cost effectiveness and good removal performance. World wide numerous low cost bio materials have tried for biosorption of dyes. In this present investigation, the dead biomass of Penicillium sp. fungus and wood sawdust was used as biosorbents and their capacity to removed malachite gr...
Autori: Cornel Pohontu, Florin Luca, Igor Creţescu, Manea Liliana, Mariana Diaconu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25593

Abstract In this study, the effect of adding granular activated carbon (GAC) to aerobic sequencing batch reactor (SBR) on possibility to treat a wastewater containing a reactive dye (Brill Blue KN-R) was investigated. Experiments were performed in four cylindrical Plexiglas reactors for 68 days (5 days for acclimatization of sludge and 63 days for normal operation in two separate phases). Initial dye concentrations were adjusted to 20, 25, 30 and 40 mg/L in the reactors R1, R2, R3 and R4, res...
Autori: Amir Asadi Vaigan, Hossein Hashemi, Mohammad Reza Alavi Moghaddam
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25624

Abstract Textile dyeing process is an important source of contamination responsable for the continous pollution of the environment. Control of water pollution has importance for both organisms, which live in water and those who benefit from water. Many dyes reaching the water source are difficult to decompose and cause many problems due to their carcinogenicity. Consequently, it is important to remove these pollutants from wastewater before their final disposal. This paper reports the resuls ...
Autori: Alina Dughila, Alina Stefanache, Cornel Pohontu, Igor Creţescu, Mariana Diaconu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25633

Adding ferric or bio-ferric agent is method to improve membrane fouling and prolong membrane life.This paper analyses the influence of ferric content on treatment effect of printing and dyeing wastewater, through examining the change of COD and dyestuff content in supernatant with the change of ferric content in sludge and in supernatant. COD in supernatant is reduced with increase of ferric content in sludge, and the dyestuff content in supernatant is reversed, which might be due to the adsorpt...
Autori: Shifeng Ji, Chunmei Gao, Hong Yang, Ming Chu, Chunfeng Wanghttp://www.ecozone.ro/reviste.php?RID=25711

Abstract:The textile industry uses high quantities of water which in many cases are disposed to the environment with inadequate treatment.In this work the effluents from the polyamide textile industry containing Bemacid Gelb, Bemacid Rot and Bemacid Blau weretreated by heterogeneous photodegradation. Treatment performances have been evaluated in terms of conductivity, turbidity, totaldissolved solids (TSD), chemical oxygen demand (COD), total organic carbon (TOC), biochemical oxygen demand (BOD5...
Autori: Luminita Andronic
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25720

Abstract:Methyl orange and methylen blue are two dyes resulted from the textile industry. They are not raising just esthetical problems, butthey are toxic and hence harmful to aquatic animals. The aim of this study is to test the capacity of three types of sawdust (oak,willow and white poplar) and mixed substrates, sawdust: fly ash (FA), to remove the methyl orange (MO) and methylen blue(MB) from wastewater. The influence of contact time, solution pH and initial concentration of dyes on the blea...
Autori: Anca Duta, Dora Lucaci
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25752

Abstract:Ash is a waste that can be an efficient substrate in wastewater treatment for the immobilization of heavy metals and for dyesremoval. For an up-scalable wastewater treatment process, efficient substrates, with relatively constant behavior are needed andmodifying the adsorbent surface can be a feasible solution. Fly ash, resulted from coal burning, and wood ash are mixtures mainlycontaining metal oxides and carbon in various proportion, depending on the initial raw material.The paper pre...
Autori: Maria Visa, Mihaela Nacu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25771

The aim of this work is the study of activated sludge floc samples stained with different dyes and imaged by Confocal Laser Scanning Microscopy (CLSM). Activated sludge flocs were stained for lipids, sugars and esterase enzyme producing bacteria. Images were acquired for different samples to analyze the structural characteristics of the bioaggregates. The analysis of the CLSM images allowed for the localization and estimation of the quantity of different build-up materials. The 3-D reconstructio...
Autori: Bela Abraham, Botond Raduly, Dan Niculae Robescu, Szabolcs Lanyi, Szabolcs Szilveszter, Szilard Bucs
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25937

2This study shows the dyeing behaviour and impact over the wastewaters quality resulted from dyeing wool fibres, of a new synthesized premetalated dyes, derived from new acid dye, sodium(E)-2 –((1-amino-4-sulphonatonaphthalen-2-yl)diazenyl)-6- methoxybenzo[d]thiazole- 5 or 7 –sulphonate, as a result of interaction with Ni(II) and Zn(II) ions. In order to characterize the complexed dyes they were studied in both phase: solution and solid phase. The dyeing performances assessment and the envir...
Autori: Ion Sandu, Laura Chirila, Maria Marcela Tarlea, Romen Butnaru, Viorica Vasilache
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25886

AbstractMultifunctional materials based on iron substituted anionic clays and their derived mixed oxides owning specific porousproperties and textural characteristics are synthesized, characterized and tested as photocatalysts in the process of the azo-dyesdegradation from aqueous solutions. The features of X-ray diffraction patterns point out the modification of the lattice parameterswhen Fe3+ is substituted Al3+ in the brucite like layer. N2 adsorption-desorption analysis reveals specific poro...
Autori: Carmen Gherasim, Gabriela Carjă, Magda Puşcaşu, Mihaela Bîrsanu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26024

AbstractGallinaceous feathers are an abundant solid waste from the poultry processing industries, which poses disposal problems. Akinetic study dealing with the adsorption process of wool reactive dye, Yellow Lanasol 4G (CI Reactive Yellow 39), ongallinaceous (Gallus gallus, Cobb 500) feathers was carried out. The main research goals of this work were to evaluate theviability of using this waste as adsorbent and to study the kinetics of the adsorption process, using a synthetic effluent. Thechar...
Autori: Sónia Adriana Figueiredo
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26203

AbstractThe aims of this study were to investigate the performance of anaerobic up-flow column reactor (AUFCR) and immobilizedactivated sludge biomass (ASB) potential for the adsorption of dye drimarene Blue-K2RL (Db-K2RL) and removal of chemicaloxygen demand (COD) from textile wastewater (TWW). AUFCR with ASB at flow rate of 50 mL h-1 and hydraulic retentiontime (HRT) of 10 h showed 95% dye adsorption at pH 4 and 87% COD reduction at pH 6 while non-activated sludge (NAS)showed only 60% of adsor...
Autori: Anwar Ahmad
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26246

AbstractThe handloom sector constitutes a distinct feature of the rich cultural heritage of India and plays a vital role in the economy and cultural identity of the country. It is an ancient industry and is source of livelihood for many villages in India. Its spread varies in style, practice and scale throughout the country - in certain regions it is has a proficient industry, while in others its establishment is localized, where it is a family-based activity. While, hand-woven fabrics are well-...
Autori: Monto Mani, Nallaval Chinnaswamy Balaji
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26285

AbstractSecondary aluminium production inherently generates significant amounts of slag of variate composition and including dangerous compounds. Consequently, a care treatment of the resulted slag is imperatively necessary for preventing the environment pollution and for recovering valuable materials even if present in low amounts. The aluminium recovering procedure is based on a chemical and hydrometallurgical slag treatment, leading to the technical grade aluminium sulphate (AS), possible to ...
Autori: Carmen Tociu, Cristina Maria, Elena Diacu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26295

AbstractA new cell design which makes an efficient use of the cathodically evolved H2 to improve the mixing efficiency and thefloatation ability during electrocoagulation was used to remove dyes from waste solution. In this study, the decolorization andCOD reduction of colored solutions containing reactive and basic dyes by electrocoagulation was investigated using aluminumelectrodes in a batch mode. The effect of operating parameters such as current density, initial dye concentration, NaClconce...
Autori: El Sayed Zakaria El Ashtoukhy
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26303

AbstractThe paper compares the electrocoagulation performance during the removal of Acid Brown 14, Acid Yellow 17, Acid Blue 113and Acid Black 172 dyes from aqueous solutions. For this purpose, pH changes and effectiveness of main parameters includinginitial dye concentrations and current densities for the selected dyes were examined. In addition, effluent turbidity, energyconsumption and amounts of released aluminum were also investigated. The present work shows that Acid Yellow 17 removaleffic...
Autori: Mahsa Taheri, , Mokhtar Arami
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26310

AbstractGraphene oxide (GO) was prepared from expandable graphite by a modified Hummers’ method and characterized by TEM,XRD, FTIR, and Raman spectroscopy. The batch adsorption experiments were carried out to study the effect of variousparameters, such as the initial concentration, adsorbent dosage, initial pH, contact time and temperature on adsorption propertiesof cationic red X-GRL onto GO. The Langmuir and Freundlich models were used to fit the experimental data of adsorptionisotherms. The k...
Autori: Jiankun Sun
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26570

Abstract This study evaluates the potential of Crambe abyssinica press cake, a residue from crambe oil extraction and/or biodiesel production, as an adsorbent for removal of cationic dyes from wastewaters. Batch adsorption tests were performed at 30, 40 and 50oC. Adsorption kinetics and equilibrium were satisfactorily described by the pseudo second-order and Freundlich models, respectively. Adsorption was spontaneous and exothermic. Fixed bed adsorption (breakthrough curve) was satisfactoril...
Autori: Adriana S. Franca
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26597

Abstract Activated carbon was prepared from renewable plant material, that is Euphorbia rigida, by chemical activation using zinc chloride as activating reagents. The adsorption of Basic Blue 9 (BB9) onto activated carbon was investigated in a batch system with respect to contact time, pH and temperature from aqueous solutions. The experimental data indicated that the adsorption isotherms are well described by the Langmuir isotherm model and the calculated maximum adsorption capacity of acti...
Autori: Özgül Gerçel
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26627

Abstract Hydrogel membranes obtained by neat polyvinyl alcohol (PVA) or PVA with various bio insertions like: Scleroglucan (Scl), Zein (Zein) or Cellulose (Cel), were subjected to diffusion and sorption/desorption experiments using different type of dyes such as: Crystal Violet (CV), Methylene Blue (MB), Congo Red (CR). If the sorption, desorption or diffusion of a dye in/from/through a hydrogel is usually monitored by the dye solution analysis, in this case the transport phenomena are follo...
Autori: Adina Papancea
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26649

Abstract Established applications of emulsion liquid membranes (ELM) refer to refining in hydrocarbons and hydrometallurgical processing, rehabilitation of poisoned patients. In this work we investigated the separation of aromatic compounds of biological interest, more often encountered as intermediates in dyes and drugs industry: aniline, nitrobenzene, ortho and para-toluidine, using emulsion liquid membranes. The experimental results showed that in the case of basic substances separation t...
Autori: Alexandra Raluca Miron
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26650

Abstract A new catalytic mixture of nanosized dioxide (CeO2) and zinc oxide (ZnO) powders have been synthesized by surfactant-assisted solvo-thermal route, characterized and evaluated for photocatalytic activity. The prepared catalysts were characterized by TG, XRD, SEM and EDAX methods. SEM analysis showed that the catalyst particles have spheroidal shape and their sizes range from 50 to 80 nm, organised as uniform distributed aggregates with large surface area, leading to the existence of ...
Autori: Gabriela Antoaneta Apostolescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26655

Abstract The class of xanthene dyes has a complex chemical structure, which showed to be toxic for mixed culture of microorganisms (i.e. anaerobic granular sludge). Because of the unwanted effects of Erythrosin B (Ery B) on environmental components and some food confirmed previously, the dye was chosen in this study to evaluate its ecotoxicity. Also, the Ery B photocatalytic degradation products were assessed in terms of their ecotoxicity. Three-days of seed germination and root growth test...
Autori: Laura Carmen Apostol
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26660

Abstract In the current study, the structural and adsorptive properties of the micro crystalline cellulose beads, Cellets 200 and 350, as well as the possibility to use them as adsorbents for removal of reactive dye Brilliant Red HE-3B and cationic dye Methylene Blue from aqueous solutions have been investigated. Batch experiments were conducted to study the effect of adsorbent particles size (200-500 μm), initial solution pH (1-11), adsorbent dose, dye concentration, temperature (2-450C)...
Autori: Daniela Suteu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26668

Abstract This study was carried out to investigate the adsorption of methylene blue (MB) onto pumice powder, as a low-cost adsorbent for the removal of dyes. The experiments were designed based on a central composite design (CCD) and the process was analyzed and modeled using response surface methodology (RSM). In order to study the adsorption process, three important factors viz. pumice dosage (20- 50 mg/50mL), MB concentration (20-40 mg/l) and contact times (5- 35 min) were chosen as varia...
Autori: Kiomars Sharafi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26729

Abstract The aim of this study is to evaluate adsorption kinetics, isotherms and thermodynamic parameters of anionic textile dye (Acid Red 88) onto montmorillonitic clay from aqueous solutions. The parameters of pH, initial dye concentrations, temperature, and the adsorbent dosage were investigated experimentally. Four kinetic models including pseudo-second order, pseudo-nth order, Bangham’s equation and double exponential equation (DEE) were selected to follow the adsorption process. ...
Autori: Sedef Dikmen
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26731

Abstract Optimum conditions for the reusability of red mud were explored testing both dried and HCl-activated red mud as a coagulant in the treatment of dyehouse wastewater. Treated dyehouse wastewater was further reused in five dyebaths with different mixture ratios of distilled water (D) and treated wastewater (W) for dyeing fabrics at three color strengths of three reactive dyes. Sludge obtained from the optimum dosage of HCl-activated red mud was tested for its reuse potential in the pro...
Autori: Aylin Yildiz
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26738

Abstract This study concentrates on the reactive biosorption of dyes such as Reactive Red 3:1 (RR3:1), Reactive Orange 13 (RO13), Reactive Blue 13 (RB13), Reactive Blue 72 (RB72). The modified fungal biosorbent, Paecilomyces sp., had a higher dye biosorption yield in our study. 100% of biosorption yield observed on RR3:1 and RB13 and 94.09% of color removal of RO13 with the chemically modified biosorbent were great. Also, such modified biosorbent exhibited remarkable performance in simulate...
Autori: Ahmet Çabuk
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26860

Abstract This study investigated the use of tea waste to decolorize refractory dyestuff from textile wastewater. The influence of the solution pH and the contacting time were examined for various adsorbents, namely green tea-leaf powder (GTP), black tea-leaf powder (BTP), and powdered activated carbon (PAC). Results from batch experiments revealed that the reduction in true color (ADMI) increases with decreasing pH. The ADMI reduced from 1106 to 150 with 0.8 g/L of GTP at pH 2. The results a...
Autori: Chih-Huang Weng
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26863

Abstract In this study, Moringa oleifera seed extract was applied as coagulant under different pH values (2.5 - 9.5), coagulant dosages (200-600 mg/L), initial dye concentrations (50-300 mg/L) and different settling times (0- 60 minutes) for R. Blue 19 and R. Red 120 dyes removal. Results revealed that with increase in pH (from 2.5 to 9.5), removal efficiency decreased from 95% to 87.3% for R. Blue 19 and from 97.2% to 62% for R. Red 120. By increasing coagulant dosage to 400 mg/L, removal e...
Autori: Ali Jafari
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26864

In this work biodegradation of basic fuchsin and methyl red by the blue green algae Hydrocoleum oligotrichum and Oscillatoria limnetica was investigated. The degradation of basic fuschin after 7 days by H. oligotrichum and O. limnetica was 92.44% and 90.23%, respectively. On the other hand, the degradation of methyl red by H. oligotrichum and O. limnetica after 7 days was 53.23% and 50.18%, respectively. The degradation of these dyes by algae seems to be related to the molecular structures of...
Autori: Ghada W. Abou-El-Souod
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26949

The adsorbent gels utilized in this research project were synthesized from non-commercially available chitosan, obtained by deacetylation of chitin, which was isolated from fermented shrimp waste by a major local industrial food biopolymer. Chitosan-based adsorbent gels were used for the removal of a tris-azo dye (Direct Blue 71) from aqueous solutions. Sorption experiments focused on the chemical modification of chitosan using two cross-linking agents, sodium tripolyphosphate (TPP) and glutaral...
Autori: Reyna G. Sánchez-Duarte
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27184

Various azodyes containing one or more sulfonic groups were removed from aqueous solutions by biosorption on untreated wood shavings from Picea abies. The sorption kinetics was described by the pseudo-first-order (PFO), pseudo-second-order (PSO) and modified pseudo-n-order (MPnO) equations, from which the MPnO model provided the best fit to the experimental data. The surface reaction was identified as a rate-limiting step governing the dye sorption on wood shavings, but a mixed kinetics (with a ...
Autori: Pavel Janoš
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27207

The application of advanced oxidation processes (AOPs) emerged as an interesting topic during the last decade. Many studies have been devoted to the complexity of phenomena imposed by AOPs, and a lot of effort was made to justify the application of AOPs. However, the reliability of AOPs has not been an issue of any extensive work. In this work, failure analysis and comparative reliability study were performed for the chosen AOP system, i.e. a laboratory scale photo- and sonoreactor, during the p...
Autori: Ivana Grčić
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27220

This study was carried out to assess the efficiency of down-flow hanging sponge (DHS) system for decolorizing the reactive dyes wastewater. The reactor was operated at different hydraulic retention times (HRTs) of 1.7, 3.5 and 6 h., and organic loading rates (OLRs) of 3.6, 2.2 and 1.3 g COD/l.d., respectively. The results obtained indicated that increasing the HRT from 1.7 to 3.6 h., significantly increased color and CODt removal efficiencies from 81±6.7 to 91.7 ±8.7% and from 24.2...
Autori: Ahmed Tawfik
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27224

The remarkable photocatalytic properties of titanium dioxide and the high adsorption capacity of the mesoporous materials were combined to obtain active photocatalysts for the decomposition of Rhodamine 6G dye. The mesoporous TiO2 was obtained by the controlled hydrolysis-condensation of titanium isopropoxide, using hexadecyl-trimethyl-ammonium bromide as template, followed by calcination to remove the organic matter. Subsequently, this sample was doped with sodium wolframate and platinum. T...
Autori: Doina Lutic
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27325

In this work, magnetic alginate was synthesized by encapsulating of Nickel Zinc Ferrite nanoparticle within Ca-alginate. The synthesized magnetic alginate was modified by ethylenediamine using microwave radiation to remove anionic dye from wastewater. The characteristics of magnetic nanoparticle, magnetic alginate and magnetic alginate amide (MAA) were studied using Fourier transform infrared (FTIR) and Scanning electron microscope (SEM). FTIR analysis confirmed the amidation of alginate. Di...
Autori: Niyaz Mohammad Mahmoodi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27424

This study evaluated the performances of adsorption and Fenton oxidation for the removal of multilan red (MLR) and multi-active blue (MActB) dyes from aqueous solution. Zeolite, the adsorbent used in the study was modified using two surfactants: hexadecyltrimethylammonium bromide (HDTMA-Br) and cetyltrimethylammonium bromide (CTAB). The modified zeolite characterized using FTIR, SEM and XRD analysis. The modification studies revealed that HDTMA-modified zeolite exhibited better performance than ...
Autori: Jacob Kitinya
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27505

Galvanocoagulation (GC) utilizing metallic iron chips and granular coke was studied as a potential technique for decolorization of dye-containing aqueous solutions. GC and chemical coagulation by inorganic metallic coagulants such as iron sulfates (Fe2+, Fe3+) were examined for the removal of individual dyes, used in the fur industry, from model aqueous solutions. The role of metal cations when progressively electrogenerated in situ was compared to when they are added simultaneously. The superio...
Autori: Marina R. Sizykh
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27526

A simple and efficient method for preparing Ag-doped TiO2 nanoparticles was successfully developed, by associating the sol-gel method and the impregnation-reduction. While titanium dioxide is one of the most used solids as photocatalyst, silver is particularly interesting for applications in biological and chemical detection and for its antibacterial properties. Moreover, in photocatalysis silver acts as an electron sink and donor in capturing the photogenerated electrons. The structural and mor...
Autori: Catalina Nutescu Duduman
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27566

The mineralization of azo dyes could be realized through solar photocatalytic degradation that is a green method where non-harmful end products are produced. The aim of this study was to investigate the mineralization of Orange G (OG) and New Coccine (NC) using ZnO as catalyst. The degradation of the azo dyes was conducted at different experimental conditions, and parameters such as effect of sunlight to the degradation rate, initial azo dye concentration, amounts of catalyst dosage, pH and effe...
Autori: Wan Fadhilah Khalik
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27643

The influence of initial metal ion concentration and temperature on the adsorption of Zn(II) from aqueous solution onto amino ethyl cellulose (AEC) functionalized with Orange 16 reactive dye, was examined. Batch experiments were performed at pH of 4.0 and adsorbent dose of 8.0 g/L previously established as optimum, ranging the initial Zn(II) concentration between 22.74-181.92 mg/L and temperature between 2 and 60 C. Three isotherm models (Langmuir, Freundlich and Dubinin – Radus...
Autori: Gabriela Nacu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27904

In the present work, acid treated natural oil palm trunk powder (OPTP) has been utilized as novel adsorbents for the removal of methyl orange (MO) from aqueous solution. The batch method was employed to study the adsorption behavior of MO which was subsequently determined by UV/Visible spectrophotometer. The adsorption characteristics and operational parameters were determined by monitoring different parameters such as pH, contact time, dye concentration and temperature. The acid treated OPTP an...
Autori: Akil Ahmad
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27975

In this paper, several image analysis techniques have been applied aiming to obtain useful information regarding the processing of municipal solid waste polymers. An automated color extraction method has been applied in order to quantize the color distribution in the polymer wastes aiming their resource and time-efficient separation according to their color. Also, by processing different density fractions from the polymer waste the color of the final material has been predicted, as well as th...
Autori: Silvia Patachia
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27994

To produce drinking water, the water treatment plants generate huge quantities of sludge, this sludge is a waste and they are evacuated to the dump. The valuation of these sludge will be benific This study focuses on the development of composite alginates beads and sludge activated chemically by sulphuric acid and thermally for the removal of dyes from aqueous solutions. Two dyes were studied; a basic cationic dye (methylene blue) and an acidic anionic dye (Congo red) to compare the adsorption m...
Autori: Hasna Elmontassir
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28125

Soluble dyes are intensively used in various industrial activities. They represent an important class of water pollutants from which they are rather difficult to remove. This paper focusses on the elimination of Congo Red (CR) ionic azo dye by adsorption on a low cost material. Cherry stones were used for activated carbon preparation by carbonization method. A temperature of 600 °C and a time of 4 h were found as adequate parameters for the physical activation and led to a final white powder...
Autori: Cristina-Gabriela Grigoraș
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28153

The Cellets product represents a cellulose material, which combines different properties such as the perfect sphericity, fine particle size distribution, low friability and solubility, and inertness. The experiments were carried out with Cellets 200 granulated celluloses used as a filling material for a laboratory glass column, using diluted dye solution (9-10 mg of dye /L of solution) at adequate initial pH (4.7). The effect of flow rate was investigated, and the modeling of experimental data f...
Autori: Iulia Nica
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28155

The textile industry has been contributing to the generation of wastewater containing dyes during the dyeing process. In this sector, Reactive Blue BB is a dye used on a large scale. One method widely applied to dyes wastewater treatment is adsorption. This technique is inexpensive since it can apply industrial by-products as adsorbents. In this work, the adsorption of Reactive Blue BB dye by the sugarcane bagasse, a by-product from the sugar and alcohol industry, was evaluated in batch syste...
Autori: Handria Hariane Piffer
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28226

Release of dyes without performing adequate treatment into the water can lead to environmental risk and serious health problems. The development of effective and economic adsorbent materials for the removal of dyes from industrial wastewaters has gained great consideration in recent years. In the present study, a novel bio-based nanocomposite has been developed for ultrasoundassisted adsorption of malachite green (MG) from aqueous solutions. The synthesized adsorbent consisting of both hydropho...
Autori: Mohsen Nekoeinia
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28232

In the wake of advance industrialization, the intensive growth of modern textile production and inappropriate wastewater treatment strategies have led to the release of noxious and carcinogenic contaminants like azo dyes directly or indirectly into the environment. Therefore, to ensure the protection of the humankind and natural bionetwork, cost-effective and efficiently regulated control measures are necessary. On this account, recent developments in biotechnology and microbiology have driven ...
Autori: Geetanjali Rajhans
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28318

The present study describes the facile synthesis of silver nanoparticles (AgNPs) by green method using aqueous extract of Gazania rigens. The size, morphological, compositional and optical properties of silver nanoparticles were examined through X-ray diffraction (XRD), Energy Dispersive X-ray spectroscopy (EDX), Scanning Electron Microscope (SEM), and UV-Vis spectroscopy respectively. Ultraviolet-Visible spectra showed the absorbance band between 425–460 nm which indicated the synthesis o...
Autori: Tayyaba Shahzadi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28349