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 Environment Action Program foresees the development of a Thematic Strategy concerning the sustainable use of natural resources and waste management (Report EUR 21002 EN, 2004). In this context, the activities regarding the research and industrial development related to waste valorization through recycling and reusing have been grown. The wastes resulted from the fine ceramic technological process (scraps, used molds etc.) may be valorized. The used molds can be valorized in other...
Autori: Ion Balasanian, Liliana Lazar
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25582

Slag-Fly Ash Based cementitious material materials with high volume of fly ash and slag and less cement clinker was prepared, with low water requirement, well fluidity and with high strength, and can be used to the preparation of High Performance Concrete (HPC). When the W/C is 0.36, the 28d compressive strength is 58.93 Mpa, 28d flexural strength is 14.26 Mpa. By XRay diffraction analysis (XRD) and Scanning Electron Microscope (SEM) analysis, the results show that main materials in grinded samp...
Autori: Chenghong Fu, Wen Ni, Hui Wu, Mingyang Tianhttp://www.ecozone.ro/reviste.php?RID=25708

AbstractThe huge emission of greenhouse gases from fossil-fuelled power plants is emphasizing the need for efficient Carbon Captureand Storage (CCS) technologies. The biomimetic CO2 absorption in aqueous solutions has been recently investigated as apromising innovative alternative for post-combustion CCS. The carbonic anhydrase (CA) - a broad group of ubiquitous enzymes– may catalyse the CO2 hydration reaction and then to promote CO2 absorption rate into aqueous solutions. Nevertheless theresear...
Autori: Antonio Marzocchella, Giuseppe Olivieri, Maria Elena Russo, Piero Salatino
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25976

AbstractThe intercalation of 2,6-dichlorobenzonitrile (DBN) into the NiMgAlLDH, CuMgAlLDH and MgAlLDH layered doublehydroxides was carried out using the calcination-rehydration reaction using NiMgAl, CuMgAl and MgAl oxide precursors,obtained by calcination at 550oC. X-ray diffraction (XRD), elemental analysis, infrared spectroscopy (FTIR) andthermogravimetric analysis (TG-DTG) confirmed that DBN molecules were successfully intercalated into the interlayer spaces ofLDHs. The resulting solid produ...
Autori: Mihaela Silion
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26244

Abstract The utilization of manure for waste-to-bioenergy conversion processes may be a sustainable development choice rather than its traditional use as a fertilizer. Furthermore, the valorization of manure via thermochemical conversion routes and their integration with biological processes can provide an additional pathway in the utilization of residual biomass. On the other hand, the use of metal oxides might enhance the performance of thermochemical processes such as pyrolysis by either ...
Autori: Maria Fernandez-Lopez
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26647

Abstract The development of biodiesel industry in the recent past brought into discussion the valorization of glycerol as the byproduct of this technology. Dehydration of glycerol leads to acrolein, mainly used as a raw material in the production of acrylic acid and its esters. Several research efforts dealing with the synthesis of acrolein from glycerol are reported in the literature. However, they are limited to catalyst testing on laboratory scale, no attention being paid to the process f...
Autori: Ionut Banu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26666

Regardless the solution adopted for accelerating the cement hardening by heat treatments, the present technologies facilitate the improvement of some of the essential deficiencies of concrete especially regarding the one concerning the slow hardening rhythm. Depending on the cement type used, after 24 hours from the last cement casting, there was registered a compression strength of about 10 to 20 % of the final strength designed at the age of 28 days, value which is not enough to remove the ...
Autori: Vladimir Corobceanu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26952

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 present study was aimed at examining the ability of the natural zeolitic tuff from the Zlatokop deposit in Serbia to remove Pb(II) ions from aqueous solutions under various conditions. It has been found that the adsorption proceeds via an ion-exchange reaction in which the Na+ ions from the clinoptilolite phase of the tuff are replaced to a high degree by aqueous Pb(II) ions. The removal capacity of the clinoptilolite at 298 K varies from 78 mg Pb g–1 (for C0 = 100 mg Pb dm–3) to...
Autori: Djordje Stojakovic
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27234

The main objective of this study was to investigate the potential utilization of polyethylene terephthalate PET waste in cementitious matrix, as substituent to cement, to develop lightweight construction materials and for preventing chemical attacks or repairing various reinforced concrete structures. Composites containing different amounts of PET particles, as partial replacement to cement by weight, were characterized by destructive and non-destructive testing. So, the thermal conductivity, ul...
Autori: Ahmed Soufiane Benosman
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27381

The anaerobic digestion (AD) of fat-containing waste is often prolonged in time and problematic. Differences in AD performances could rely in a different probability for microorganisms to access the substrate. The aim of this study was to study the AD of waste cooking oil (WCO) with a biophysical approach. Two laboratory experiments were carried out using model systems consisting of WCO + hydration medium (HM) in 100 mL, static, in-batch reactors. In the first experiment, we assumed the WCO to H...
Autori: Francesca Fiume
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27409

This study aims to obtain high performance cement under friendly environmental conditions, through the optimization of clinkerization process. The influence exerted by mineralizers i.e. fluoride (NaF, KF) or oxide (CuO, TiO2) on the Portland clinker characteristics and derived cement properties is presented in this experimental study. The presence of these additions in low concentration (i.e. 0.5-0.8 wt. %) permits the reduction of the burning temperature (with 20oC up to 70oC) of raw mix and mo...
Autori: Jenica Paceagiu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27500

Large amounts of spent coffee grounds (SCG) are currently available all over the world due to the enormous increase in coffee consumption. This increase has in turn to be related to the even greater diffusion of coffee vending machines. The aim of this study was to evaluate the biomethanation potential (BMP) of SCG alone or in co-digestion with pig slurry (PS). Pig slurry was chosen because it is frequently utilized as feedstock for biogas production from agricultural waste. The raw material was...
Autori: Ciro Vasmara
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27794

In this work, the examination of separation of gypsum from wastewater generated during the machining of casts and the method of waste gypsum management have been presented. This waste gypsum is produced in Ortolab Poland facilities. Gypsum casts are cut and ground in water-cooled circular saws. Wastewater, with over-normative content of suspension, 10000 mg L-1 and sulphates, 1600 mg L-1 is produced in the process. The analysis of water and wastewater management in Ortolab Poland facilities l...
Autori: Ewa Liwarska-Bizukojc
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27910

The industrial water quality of a thermal power plant is of high importance, and a process water treatment station being always required. Whatever the adopted treatment system is, it is accompanied by the production of different amounts of sediment and sludge, which must be disposed and valorized. This paper presents in detail, the physical-chemical treatment system applied for the industrial water production in a Romanian thermal power plant (Veolia Energy Iasi Co.), referring to its installati...
Autori: Dorina Stănciulescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28154