Contine urmatoarele articole:??Â?Â? Alternative energy sources in transition countries. The case of bioenergy in Ukraine??Â?Â? Catalytic destruction of aromatic VOCs on SCR-DeNOx commercial catalyst??Â?Â? Ecological Economics And Transport Systems??Â?Â? Bioleaching of uranyl ions from uranium ores by some algae??Â?Â? Irreversible affinity immobilization of lentil seedling??Â?Â? Evaluation of artificial neural network techniques for river flow forecasting??Â?Â? Hydrogen and sustainable energy. Re...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25194

AbstractIt was investigated the bioleaching of uranyl ions from uranium ores, in aquatic medium with algae: Scenedesmus quadricauda and Nostoc linkia under different experimental conditions. The oxidation of U(IV) to U(VI) species, like uranyl ions was done by means of the atomic oxygen generated through photosynthesis by the aquatic medium from solution above of uranium ores.After almost 10 days of direct contact with the given microorganisms, it was observed a bioleaching degree between 10% an...
Autori: Alexandru Cecal, Rodica Calmoi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25107

AbstractThe goal of this paper is to examine the potential for ecologically and economically sustainable kraft pulp mills. This paper reviews technical and scientific literature on a wide range of factors that will influence the overall impact of a pulp mill on its total environment. The emphasis is on efforts to achieve "closed-loop," or Totally Effluent Free (TEF) mills which eliminate all liquid effluent and minimize the quantity and environmental impact of air and land discharges. An attempt...
Autori: Adrian Puitel, Dan Gavrilescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25202

This study presents an evaluation of the catalytic performances of Fe containing clay-based catalysts for the wet hydrogen peroxide catalytic oxidation (WHPCO) of 4-chlorophenol (4-CP) aqueous wastes. The catalysts were prepared by well-established techniques, their properties being determined by DRX, BET and chemical analysis techniques. All the tests were performed on a laboratory scale set-up. The ion-exchanged clays were the most active catalysts (100 % 4-CP and 84 % COD removal for Fe-Mt) b...
Autori: , Cezar Catrinescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25157

Contain all the articles from this issueICEEM /01 PLENARY CONFERENCETen years of Environmental Engineering and Management education and research at the Technical University of IasiMatei Macoveanu, Carmen Teodosiu ICEEM/01  - Environmental Engineering SectionRemoval of nitrogen oxides from Diesel exhaust: Laboratory studies for development of an SCR-catalyst-system using solid urea as reducing agentWerner Weisweiler High temperature desulphurization of hydrogen sulphide containing ...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25167

Contain all the articles from this issueICEEM/02 - ENVIRONMENTAL ENGINEERING SECTION"Treatment Technologies for Gaseous Fluxes"Surface chemistry studies on molybdena–alumina catalystTatiana Yuzhakova, ?kos R?Šdey, Endre Domokos, J??zsef Kov??cs, Monica Caldararu, Cristian Hornoiu, Mariana Carata, G.Postole, Cornel Munteanu, Larisa Strukova, Jozse FazakasHebicidal behaviour of a new N,N'- biquaternary salt of 4,4'- bipyridineServilia Oancea, Marinela Irimia, Gabriela Carja, Anton Airinei, Nicu...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25189

? Kinetics considerations concerning the oxidative degradation by photo-fenton process of some antibiotics ? Catalytic wet hydrogen peroxide oxidation of 4-chlorophenol over iron-exchanged clays ? Researches on the negative effects assessment (slugging, clogging, ash deposits) developed at the biomass-coal co-firing ? Contribution to the study of the environmental heritage of a former chemical plant ? Impact of chemicals on derivatives with important therapeutic activity in C...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25376

AbstractAn assessment of acide drainage forming potential for a mining waste material resulted in a former mine of nonferrous and precious metals ore has been made. The waste material has the following contents: 2,20?ˇ2,28% sulphide sulphur, 2,53?ˇ2,58% Fe, 0,07% Cu, 0,05% Zn, 0,36?ˇ0,40% Pb, 0,008?ˇ0,013% Ca and 3,85?ˇ7,97% sulphate. Bacterial leaching tests in percolating columns during 380 days have been made. The leaching liquor has been recirculated at a liquid:solid ratio of 1L:1kg. After ...
Autori: Vasile Oros
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25239

AbstractIn this work it had been tested the recovery of some compounds like: Fe2O3, TiO2, PO4 3- ions, Al2O3 from the sludges, which result in the industrial facilities for output of pure uranium dioxide. Solubilization of the chemical compounds from the uraniumwastes was performed in strong acidic media, using adequate methods....
Autori: Alexandru Cecal, Doina Humelnicu, Romeo Iulian Olariu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25288

Include urmatoarele articole:� Removal of nickel from aqueous solution by Nordmann FIR (ABIES Nordmanniana (STEV.) SPACH SUBSP. Nordmanniana) cones� Determination of heavy metals in extracts and macerates from garden flowers� Biological phosphorus removal in a high performance single reactor � Advanced Cd2+ removal on dispersed TioO2-fly ash � Remediation techniques for contaminated soils� Separation of uranium(vi) from soils by extraction in aqueous PEG (1550) - Na2SO4 - Na2CO3 two-...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25296

AbstractThe present article deals with the study of the quality of the soils in the Cordun area – the waste dump. This refers to the characteristics of the analyzed location site (geomorphological, geological considerations, the pedological and agrochemical characterization of the soils in the area outside the plant), but also to the establishment of the pollution rate in the location site (experimenata data, results and debates). The conclusion of the present article is that the analyzed area...
Autori: Elena Doinita Carlig, Matei Macoveanu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25315

â€? Photocatalytic properties of titania - fly ash thin filmsâ€? Study of the viscosity of some biodiesel – diesel oil blendsâ€? Aspects refering to technical and leaching properties of the secondary aluminium slags - cement compositesâ€? Studies regarding phenol and 4-chlorophenol sorption by surfactant modified zeolitesâ€? Cu-Ni nanostructured electrocatalysts obtained by electrocodepositionâ€? Molecularly imprinted poly (vinyl alcohol) films for the selective absorption of glycyrrhizinic ac...
Autori: http://www.ecozone.ro/reviste.php?RID=25373

â€? Photocatalytic properties of titania - fly ash thin filmsâ€? Study of the viscosity of some biodiesel – diesel oil blendsâ€? Aspects refering to technical and leaching properties of the secondary aluminium slags - cement compositesâ€? Studies regarding phenol and 4-chlorophenol sorption by surfactant modified zeolitesâ€? Cu-Ni nanostructured electrocatalysts obtained by electrocodepositionâ€? Molecularly imprinted poly (vinyl alcohol) films for the selective absorption of glycyrrhizinic ac...
Autori: http://www.ecozone.ro/reviste.php?RID=25374

Abstract The purpose of this work is to investigate the secondary Al slag (SAS) relating to its technical and environmental properties and, as consequence, to its compatibility with Portland cement matrix. This study may be a contribution to establish of SAS potential valorization as secondary raw material (SRM) in low strength cement matrix composites, as construction products. DRX mineralogical analyses revealed that SAS includes transition alumina compounds, especial boehmite. The hydrati...
Autori: Maria Gheorghe, Nastasia Panait, Romanita Teodorescu, Maria Roman
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25498

Abstract The use of appropriate leaching tests and leaching models can help to predict the hazardous components release from cementbased solidified waste during either utilization or disposal. Numerous parameters influence the leaching rates such as grain size/specimen size,ccc liquid-to-solid ratio, pH value of the leachate, leaching time etc. This study evaluates the effect of initial liquid-to-solid ratio of cement paste on the release of copper from cement-based solidified waste. Dynamic ...
Autori: Constantin Bobirica, Liliana Bobirica, , Ionel Constantinescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25527

Abstract Heavy metals produced and released by anthropogenic activities generate serious environmental problems. Ions of toxic metals can bind to the mineral surface in a number of ways, including absorption, adsorption, precipitation, ion exchange. The paper shows that the fate and migration of heavy metals in soils strongly depend on the physical properties and chemical and mineralogical composition of such environments. Cadmium is one of the most toxic metals with carcinogenic and teratog...
Autori: Vasile Lucian Pavel, Dumitru Bulgariu, Laura Bulgariu, Raluca Maria Hlihor, Maria Gavrilescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25577

Abstract In the last decades there has been a rapid evolution of techniques for production of bleached pulp. Much of these processes have been environmentally driven. New techniques have been developed in order to replace chlorine-based reagents in producing bleached pulp. Reducing the environmental impact of pulp production can be attain by using non-pollutant bleaching reagents like oxygen and related compounds. This paper deals with present findings and general trends in environmentally-s...
Autori: Adrian Catalin Puitel, Alexandru Botar, Dan Gavrilescu, Gheorghe Dutuc, Grigore Craciun
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25592

Abstract Chlorophenols were selected for this study because most of them are toxic and difficult to biodegrade. They represent a particular group of priority toxic pollutants listed by the US EPA in the Clean Water Act and by the European Decision 2455/2001/EC. The efficiency of advanced oxidation processes for degradation of chlorophenols has been extensively documented. The catalytic wet hydrogen peroxide oxidation process, involving oxidation with H2O2 and solid catalysts in mild reaction ...
Autori: Brindusa Dragoi, , Cezar Catrinescu, Daniela Arsene
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25601

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:The oxidation of low grade complex concentrates (Cu, Pb and Zn) in aqueous media (weak alkaline) oxidized nonferrous metalsconcentrates is carried out at high pressure. Leaching is the subsequent processing step in metal extraction. The paper studies theinfluence of some parameters (temperature, time, L:S ratio, excess) on the leaching efficiency of nonferrous metals from oxidizedconcentrate. The optimum parameters determined are: S/L ratio of 10/1, 25% reactive excess, leaching tempera...
Autori: Cornelia Lupu, Dragoş Taloi, Liliana Gherghe, Luminita Mara, Teodor Velea, Vasile Predica
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25774

The paper aims to present the environmental impact of pulp and paper manufacturing and the most important production and control practices to minimizing this impact. The environmental consequences of manufacturing pulp and paper from pulping and bleaching processes are discussed in qualitative and quantitative terms. In these processes, sulfur compounds and nitrogen oxides are emitted to the air, and chlorinated and organic compounds and nutrients are discharged to the wastewaters. Large quantit...
Autori: Adrian Catalin Puitel, Dan Gavrilescu, Gheorghe Dutuc, Grigore Craciun
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25857

AbstractIn this study, as part of developing a green recycling process of spent lead-acid battery that can avoid both smelting and electrowinning, leaching agent citric acid and other additives (such as sodium citrate and hydrogen peroxide) in aqueous media were reacted with spent lead-acid battery paste. PbO, PbO2 and PbSO4, which are the three main components in a spent lead-acid battery paste, were leached to form lead citrate precursor which was crystallized and then separated from the solut...
Autori: Xinfeng Zhu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26215

AbstractWater system integration can minimize both fresh water consumption and wastewater discharge from the paper mills. In thepresent study, Pinch Technology was used to analyze and optimize the water network of an integrated paper mill. A system wasdeveloped and a limiting constraint (COD concentration) was identified based on investigations for water quality, and thenminimum fresh water and wastewater targets were determined without considering water losses. The analysis was extended byestim...
Autori: Sudheer Kumar Shukla
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26240

AbstractWashing black aluminum (Al) slag to obtain soluble salts is an important stage of the smelting slag treatment at technologicalprocess. This process is used to recover Al as a coagulant for water purification. This research aims at establishing the optimalconditions for washing (e.g. temperature (T), solid: liquid ratio (S : L), time, the recirculation waters in the system). The goal ofresearch was to determine: a) the removal with maximum efficiency of the soluble salts from black Al sla...
Autori: Romanita Teodorescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26243

AbstractThis paper continues the previous investigations regarding the technology for the Aluminum (Al) recovery as Al sulfate fromblack Al slag. Leaching is the next compulsory step in the Al extraction process. The paper studies the influence of mothersolutions´ (MS) recirculation resulted from the process within the system over the quality of Al sulfate and the siliceous residue(R) and, the aluminum nitride (AlN) hydrolyses in the leaching process. The optimum parameters determined are: *the ...
Autori: Romanita Teodorescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26250

AbstractThe paper analyses the opportunity of recycling sewage sludge in the manufacturing of ceramic building materials. Wastewatertreatment plants (WWTP) produce annually a great volume of sludge and its processing become more difficult. On the otherhand, there is an increased need to develop new alternatives beyond the already known methods. The use of WWTP sludge asraw material for the production of bricks may become an interesting alternative, both from an industrial and environmental point...
Autori: Anna-Maria Szőke
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26251

AbstractThe efficiency of solar disinfection (SODIS) was evaluated and enhanced by concentrating sunlight at low pH values in a solar collector disinfection (SOCODIS) system at different sunlight intensities and is highlighted in the author’s earlier findings. In order for further improving the rainwater disinfection, simple technique like wrapping the PET bottles with heat-resistant plastic bags (Wp) were used for enhancing the thermal/synergistic effects of solar radiations. An analysis of the...
Autori: Abdulrahman Ali Alazba, Mooyoung Han, Muhammad Nasir Amin, Muhammad Tahir Amin
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26298

AbstractThe possible recovery of three microelements contained in the sludges resulted after chemical leaching of uranyl ions fromuranium ores was investigated, using four types of zeolites as adsorbents. The variation of the retention degree in time of 3cations: Fe3+, Ti4+ and Ni2+, adsorbed on: ETS-10, ETS-4, ZSM-5 and mordenite was followed. The characteristic adsorptionparameters connected to Langmuir and Freundlich isotherms were also determined. For a given adsorbent, the rate of globalret...
Autori: Alexandru Cecal, Dumitru Gânju, Maria Ignat, Nicoleta Melniciuc-Puica, Petrisor Mugurel Samoila
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26327

AbstractAcid rain is a general term used to describe acid depositions, i.e. rain, fog and snow (known as wet deposition), as well as acidgases and particles (known as dry deposition). Acid rain is of particular environmental concern in Romania, as many soils havelately become acidic, causing serious damages to plants, animals and human beings. The purpose of this study is to evaluate bysimulation the impact of acid rain on a podzol sample taken from the Retezat National Park, a Romanian protecte...
Autori: Clementina Moldovan
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26399

AbstractThis study aims to understand the acid-leaching behavior of metals from 2 to 4 mm waste printed circuit boards (WPCBs)containing 22.0% ą 1.1 Cu, 6.7% ą 0.2 Ca, 0.68% ą 0.02 Sn, 0.59 ą 0.01 % Pb, 2.71% ą 0.08 Al, 0.22% ą 0.01 Fe, etc..Copper leaching was increased for sulfuric acid concentrations up to 1.2 mol/L and hydrogen peroxide concentrations of 10.0vol% for a pulp density of 100 g/L at 50°C over 4 h, whereas for the same concentrations of sulfuric acid and hydrogen peroxidecopper l...
Autori: Manoj Kumar
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26566

AbstractWe reported the results of an isotopic study aimed at evaluating the medium to long-term effects of different water qualities anddeficit irrigation strategies on the ecophysiology of grapefruit in a 7-year-old plantation in SE Spain. For a better understandingof the interaction between nitrogen and salts from reclaimed water, RW, an experiment using natural abundance (δ) of 15N wasconducted. This study showed that in grapefruit crop irrigated with RW leaf δ15N value increased. ...
Autori: Cristina Romero-Trigueros
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26573

Abstract Cadmium leaching experiments from hazardous waste containing 16.5 wt% CdO were conducted using H2SO4. Dominant experimental and process parameters were determined by factorial design. Six controlling factors were considered, i.e. solidliquid ratio, acid concentration, reaction time, particle size, stirring speed and temperature. Analysis of variance (ANOVA) was used to identify main effects and their interactions. An empirical model, based upon experimental results, was developed to...
Autori: Mahdi Gharabaghi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26590

Abstract In Hungary, 0.5 million m3 of thermal water is exploited every day for diverse purposes. After utilization, this enormous amount of thermal water becomes sewage water with a high concentration of salts, heavy metals, ammonia, nitrate, an unfavorable ion composition and high temperature. A common treatment is to dispose of waste water into a surface recipient through uninsulated channels surrounded by arable land. By infiltration, sewage water can cause potential salinization/sodific...
Autori: Andrea Farsang
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26742

Abstract This study is focused on the removal of leachable lead present in CRT (cathode ray tube) glass employing different chelating agents, NTA (nitrilotriacetic acid) and ATMP (amino trimetilen phosphonic acid), and then on the evaluation of their extractive capability. The operating conditions are the following: T=80°C, t=1h, pH=10, solid/liquid weight ratio=1/10, reagent concentration= 0.1 M. Afterwards a number of leaching tests at controlled pH were performed in the 5-9 range for ...
Autori: Elena Bursi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26772

Abstract The aim of this paper is to assess the chemical and mineralogical composition and the leaching behavior of the electric arc furnace slags (EAFS) in order to improve their management by identifying suitable reuse options in different fields. The chemical and mineralogical composition of slag varies from one type of steel to another, from one technological stage to another and from one steel plant to another. In order to minimize the slag quantities disposed in the slag dumps one has ...
Autori: Dana-Adriana Iluţiu-Varvara
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26835

Abstract The amount of bottom ash produced in Italy from municipal solid waste incinerators is estimated at over a million tons per year. Up to now, it has almost all been disposed of in landfills. Therefore, large profit margins, from both the economic and environmental standpoint, can be expected from the recovery of this material, or at least from a fraction of it. In this study, a rapid procedure for the recovery of different bottom ash fractions based on mechanical sorting and aging was...
Autori: Ivano Vassura
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26853

Abstract The aim of the present study was to determine the most feasible experimental conditions for the dissolution of base metals (Cu, Ni, Zn, Pb, etc.) from waste printed circuit boards (WPCBs) obtained from WMP. The leaching of WPCB samples was performed with FeCl3 in HCl solution which allowed the separation of a precious metal rich solid residue and a high base metal concentration solution adequate for base metal recovery. The most favorable conditions for the leaching process were ide...
Autori: Szabolcs Fogarasi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26877

Abstract The goal of this paper is to investigate the decomposition of aqueous solutions of Azorubin (E122), i.e., an azo dye used in food industry, in a pulsed gliding arc discharge reactor (direct treatment). Air and Argon as carrier gases with solution spray has been considered, as a first approach. The bleaching of the aqueous solution was observed immediately after direct plasma treatment and the decreasing of the dye concentration have been emphasized. Further more, the dye concentrati...
Autori: Marius Ursache
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26898

Abstract The present study was designed to determine the sound effects of ultrasonic treatment and the biologically mediated extraction of uranium from low grade black shale. Low grade uranium was subjected to fungal treatments assisted by sonication by conventional methods. In situ fungal leaching of black shale with different fungal strains in the presence of molasses as growth substrate resulted in highest leaching yield of uranium by Phoma tropica (57.73%) compared to Penicillium chrysog...
Autori: Fozia Anjum
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26919

Ferric sulfate and aluminum sulfate were applied to stabilize the available arsenic in solid waste residue (SWR) from the organic arsenic industry, previously pretreated by the semi-solid Fenton process. NaOH, Ca(OH)2, and MgO were introduced to adjust the matrix pH. Toxicity characteristic leaching procedure (TCLP), synthetic precipitation leaching procedure (SPLP), and sequential extraction procedure (SEP) were carried out to evaluate the effect and difference on the fixation treatments of ...
Autori: Li-Fang Hu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26956

The application of chemical fertilizers and fungicides is an important source of heavy metals into the agricultural soil. Leaching and weathering can facilitate the transport of the contaminants through soil to the groundwater. In most rural areas, groundwater is used for drinking and irrigation purposes, without any treatment, population being exposed to direct contamination. The study area in this paper, Arjaat Village from Rabat Salé Zemour Zaer Region of Morocco, matches into this ...
Autori: François Xavier Nshimiyimana
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26980

The release of nitrogen compounds into the environment is a major concern worldwide. Different studies howed that recycled materials have a high removal capacity for pollutants. Bentonite and its major clay minerals, smectites clays are common bleaching agents used for oil refinery bleaching and known as bleaching earth (BE). In this study regeneration of spent bleaching earth (SBE) acquired from the vegetable oil industry was surveyed via different methods and the regenerated spent bleaching...
Autori: Mohammad Malakootian
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27000

Iron humate (IH) produced as a waste by-product during the industrial manufacture of humic substances from young brown coal was tested as a new cost-effective sorbent for the removal of inorganic arsenic from waters. Its removal efficiency was compared with that of two other non-conventional sorbents – magnetite and oxihumolite (weathered brown coal). Magnetite and IH have been found to be effective in removing both forms of inorganic arsenic (arsenite and arsenate) from aqueous solutio...
Autori: Pavel Janoš
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27098

This work focuses on treatment of lead polluted waste glass from urban collection (Pb≈5% wt) for its valorization as support in the immobilization of lipase, because soda-lime glasses are used in enzymatic catalysis. First of all, an extraction process of surface Pb was performed. The process is based on nitrilotriacetic acid (NTA) chelating agent. The operating conditions are: T=80°C, t=1h, pH 10, solid/liquid weight ratio=1/10, reagent concentration=0.1 M. Leaching tests at contr...
Autori: Luisa Barbieri
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27122

This study was carried out to (1) investigate the potential of in-vessel solid-state anaerobic acidogenic co-digestion of high solids containing substrates, namely organic fraction of municipal solid waste (OFMSW) and cow manure and (2) examine the feasibility of using leaching bed reactors (LBR) for hydrolysis/liquefaction and acidification of OFMSW and cow manure mixtures for maximum total volatile fatty acid (VFA) and alcohol production. Results indicated that hydrolysis efficiency of 20-25% ...
Autori: Tuba H. Erguder
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27186

Different bioleaching processes were applied to mining wastes deposited in the highly polluted post-industrial region - Lower Silesia in Poland. The chemical characterization of the wastes before and after bioleaching processes was performed. The characterisation was based on the distribution of selected elements (Fe, Mn, As, Co, Cr, Cu and Ni) between operationally-defined phases. The phases were defined using a six-step extraction procedure optimised according to the properties of the studie...
Autori: Joanna Pałdyna
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27259

The solid-liquid extraction process and some of its influencing factors such as solid-liquid ratio, temperature and salt initial amount have been investigated. Also, mathematical modeling for mass transfer coefficients calculation was applied. An inert porous solid material (coal), impregnated with 10% and 20% mass NaCl or 15% and 30% mass CaCl2, was used. The leaching was conducted in a fixed bed column, in laminar flow. The CaCl2 impregnated samples were investigated in a column with a height...
Autori: Marcel Popa
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27557

Chemical oxidation of pyrite and chalcopyrite by ferric sulfate (Fe2(SO4)3) solution and biogenic ferric iron obtained by mixed culture of isolated thermotolerant Acidithiobacillus sp. 13Zn and Leptospirilum ferriphilum CC immobilized on natural carriers- zeolite and shungite was studied. Oxidation rate of sulfide minerals was estimated by the decrease of Fe3+ (oxidant) and increase of Fe2+ ions in the solution. It was revealed that chemical oxidation of chalcopyrite by biogenic ferric iron occu...
Autori: Arevik Vardanyan
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27563

• Environmental engineering and Management Journal No. 4    • AN ENHANCED ENVIRONMENTAL MULTIMEDIA MODELLING SYSTEM (FEMMS): PART II – USER INTERFACE AND FIELD VALIDATION    • COST-EFFECTIVENESS OF OPTIMIZING CONCENTRATED FEED BLENDS TO DECREASE GREENHOUSE GAS EMISSIONS    • FATE AND BIODEGRADATION OF ESTROGENS IN THE ENVIRONMENT AND ENGINEERING SYSTEMS – A REVIEW    • ANALYSIS OF THE MATERIAL COMPOSITION OF MIXED MUN...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27577

• Environmental engineering and Management Journal No. 4    • AN ENHANCED ENVIRONMENTAL MULTIMEDIA MODELLING SYSTEM (FEMMS): PART II – USER INTERFACE AND FIELD VALIDATION    • COST-EFFECTIVENESS OF OPTIMIZING CONCENTRATED FEED BLENDS TO DECREASE GREENHOUSE GAS EMISSIONS    • FATE AND BIODEGRADATION OF ESTROGENS IN THE ENVIRONMENT AND ENGINEERING SYSTEMS – A REVIEW    • ANALYSIS OF THE MATERIAL COMPOSITION OF MIXED MUN...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27576

Pyrometallurgical recycling of lead from spent batteries entails secondary waste fractions generated in the blast furnace as iron stone and lead slags. For further purification of both fractions, hydrometallurgic processing is proposed. This paper focuses on purification of iron stone, in view of recovering metals (mainly lead) and of producing decontaminated iron stone fit for further recycling. The results demonstrate that iron stone is mainly composed of iron and lead; copper, zinc and antimo...
Autori: Bart Van der Bruggen
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27642

The paper describes the main results from a study of cement bound mixtures for road foundations with the aggregate matrix consisting of industrial wastes, i.e. foundry sands (FS), electric arc furnace (EAF) steel slags and bottom ash from municipal solid waste incineration (MSWI), combined in five different proportions. The laboratory investigation involved a preliminary analysis of the chemical, leaching, physical and mechanical properties of the industrial wastes, followed by a mechanical char...
Autori: Marco Pasetoo
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27645

Two sets of simulated landfill reactors, namely conventional landfill (CL) and leachate recirculated landfill (RL) were operated to investigate the effect of leachate recirculation on the fractionation of Zn in municipal solid waste (MSW) landfill leachate. Zn in landfill leachate was fractionated into three fractionations: particulate and colloidal matter >0.45 μm, non-labile complexes <0.45 μm and free cations/labile complexes <0.45 μm. The result showed that the recirculatio...
Autori: Jun Yao
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27648

The Silicon wafer plays an important role in modern electronic products. During the production of Silicon wafer, a large amount of scrap Silicon wafer is generated. The necessity for it to be recycled and recovered is of vast importance since the metal Silicon (Si) is the major by product. Besides Silicon, the wafers also contain a small quantity of Copper (Cu) and Aluminum (Al), that are considered as minor elements during the recovery process of the Silicon wafer production. Therefore, in o...
Autori: Ching-Hwa Lee
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27660

The aim of this paper is to show the results of two methodological approaches applied for decontamination of the Midia Port dredged sediment to assess their potential reusability. Firstly, the sediment samples were defined in physical, chemical, microbiological and ecotoxicological terms. The results were compared to the limit values established by environmental regulations for dredged sediment management. Some sediment samples exposed a very high concentration of hydrocarbons; the sediments wer...
Autori: Irina Catianis
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27770

The aim of this paper was to investigate the possibility of incorporation non-metal fraction (NMF) in concrete products as a substitute for aggregate on industrial scale, while other studies are mostly based on NMF incorporation in concrete only on laboratory scale. Mineral filler was supplemented with 5, 10, 15 and 20 wt.% NMF from waste printed circuit boards (WPCBs) and its influence on concrete quality was assessed based on compressive and tensile strength conducted on laboratory and indust...
Autori: Vitomir Premur
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27857

In this paper a two stage bench scale leaching procedure is used to assess the heavy metals release from a wood-based fly ash of a 5.0 MWth grate-fired boiler. In the first step mostly K was leached with water. In the subsequent acid leaching step heavy metals were leached at a pH of 3. The remaining solids were agglomerated together with the bottom ash and the dried K-concentrate from the first leaching step whereas the filtrate was treated before discharge. In the agglomerates produced the ...
Autori: Christof Lanzerstorfer
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27875

Air cooled and water cooled slag samples were obtained from a demonstration plasma gasification / vitrification unit. The leachability of the major heavy metals present (Cr, Cu, Mn, Fe, Pb and Zn) in both the air cooled and water cooled slag when in contact with acidic solutions was investigated under different temperature, stirring and contact time conditions. Water cooled slag showed better resistance to heavy metals leaching. The vitrification process immobilised Cr and Pb. The leachabilit...
Autori: Konstantinos Moustakas
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27882

Clinoptilolite (Clin), the most widely used natural zeolite in environmental applications, was used as soil additive to investigate its effectiveness in protecting and improving the quality of soils that received surface disposal of OMW, as well as in limiting nutrients leaching from the degraded soils. Clin was added in a batch experiment of 18 months, where OMW were added in evaporation ponds and on soil for a period of more than 12 years. The zeolite was added as dust (particle diameter &l...
Autori: Maria K. Doula
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28018

Substantial quantities of toner cartridges are produced and used in photocopiers and printers every year. Spent toner cartridges are classified as hazardous waste because they contain toner powder with specific chemical composition, making a recovery of waste toner cartridges a very important issue from the aspect of waste management and environmental protection. Spent toner cartridges are mechanically processed to exploit valuable materials such as metals, plastics and magnets and to separate t...
Autori: Ivana Melnjak
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28053

Iodine is an essential microelement required by humans and animals. Leaching of soils under intensive rains has threatened the fertility status of iodine in soils. Therefore, four discrete amendments were used for the mitigation of iodine leaching from soils. For this study, soils collected from four land uses were mixed with the amendments (gypsum, lime, fly ash, charcoal and sawdust) at the rate of 0, 2.5% and 5% (w/w) in PVC columns. Potassium iodide (KI) was applied to the soil at rate of 10...
Autori: Muhammad Mohiuddin
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28071

Soil salinization is becoming worldwide one of the most serious land degradation issues. Seawater intrusion in upper aquifers is responsible for the largest proportion of salt-affected agricultural lands in coastal areas. In this study, the impact of different irrigation strategies on the salinity of a maize cultivated field located in the coastal plain of Ravenna, Italy, was simulated with the FAO AquaCrop model. Model calibration was supported by comparison with remote-sensed and field collect...
Autori: Marinella Masina
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28088

Aim of the study is to determine Fe, Mn and Cd adsorption in the carbonate-rich clayey soils and to assess their environmental impacts. Soil samples represented a carbonate-rich clayey soil (Isaoren), carbonate-rich soil (Maşuk) and clayey soil (Aşık) was obtained from three different villages in Sanliurfa, southeast of Turkey. Adsorption studies were carried out with batch method. The maximum Fe, Mn and Cd adsorption was found on Isaoren, Maşuk and Aşık soils with ...
Autori: Ayse Dilek Atasoy
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28116

Arsenic-containing acid wastewater produced in the mining and smelting process will bring great harm to the environment, while to treat arsenic-containing wastewater with iron salt and lime is an economical and effective method. In this paper, iron salt was added to co-precipitate the arsenic and heavy metals, the pH value of arsenic containing acid leaching solution was adjusted by adding of lime. The stability of co-precipitates was also investigated in this study. The results show that the ir...
Autori: Yongliang Wang
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28121

The paper analyses the possibilities of recycling tannery sludge (TS) in clay brick manufacture. The physico-mechanical properties and microstructure of clay brick and cement mortars vary depending on TS content in the mix. 2.5 %–15.0  TS (by weight) was added to clay bricks fired at 1000 C temperature and maintained at maximum heat for 1 hour. The tests revealed that 2.5  TS addition had a positive effect on physical and mechanical properties of clay brick: reduce drying and mfi...
Autori: Olga Kizinievič
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28209

Saline-sodic soil reclamation can be enhanced with a sustainable and environmental approach by using organic waste materials. Moreover, wastewater can be used in leaching processes to protect freshwater resources in regions with water shortages. The aim of this study was to reclaim saline-sodic soil by using recycled wastewater and stabilized sewage sludge together with gypsum. The experiment was designed with three replicates using four different sewage sludge doses (0, 4, 8 and 12 kg m-2), an...
Autori: Almujtaba Hassbalrassol Muhammed Abdallh
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28330