The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Natalija Koprivanac - One of the best experts on this subject based on the ideXlab platform.
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Minimization of Organic Content in simulated industrial wastewater by Fenton type processes: a case study.
Journal of hazardous materials, 2009Co-Authors: Ivana Grcić, Dinko Vujević, Josip Sepcić, Natalija KoprivanacAbstract:Pre-treatment of simulated industrial wastewaters (SIM1, SIM2 and SIM3) containing Organic and inOrganic compounds (1,2-dichloroethane, sodium formate, sodium hydrogen carbonate, sodium carbonate and sodium chloride) by oxidative degradation using homogeneous Fenton type processes (Fe2+/H2O2 and Fe3+/H2O2) has been evaluated. The effects of initial Fe2+ and Fe3+ concentrations, [Fe2+/3+], type of iron salt (ferrous sulfate vs. ferric chloride), initial hydrogen peroxide concentration, [H2O2], on mineralization extent, i.e., total Organic Content (TOC) removal, were studied. Response surface methodology (RSM), particularly Box-Behnken design (BBD) was used as modelling tool, and obtained predictive function was used to optimize the overall process by the means of desirability function approach (DFA). Up to 94% of initial TOC was removed after 120 min. Ferrous sulfate was found to be the most appropriate reagent, and the optimal doses of Fe2+ and H2O2 for reducing the pollutant Content, in terms of final TOC and sludge production were assessed.
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fenton type processes for minimization of Organic Content in coloured wastewaters part i processes optimization
Dyes and Pigments, 2007Co-Authors: Hrvoje Kusic, Ana Loncaric Božic, Natalija KoprivanacAbstract:This study was focussed on application of Fenton (Fe2+/H2O2) and Fenton "like" processes (Fe3+/H2O2 and Fe0/H2O2) for minimization of Organic Content of coloured synthetic wastewaters. Two reactive dyes, C.I. Reactive Blue 49 with anthraquinone chromophore and C.I. Reactive blue 137 with azo chromophore were used as model Organic pollutants. Fenton type processes were investigated in order to establish optimal operating conditions for maximal degradation of investigated synthetic coloured wastewaters ; pH, concentration of iron salts or iron powder and ratio of Fenton reagent. Degradation of studied dyes as Organic pollutants was monitored on the basis of decolourization and mineralization extents of model solutions, determined by UV/VIS spectrophotometric, and TOC and AOX analysis, respectively. Colour removal over 95 % was achieved by all applied processes, while mineralization extents ranged between 34-72 % depending of dye structure and applied AOP.
Yasser M Metwally - One of the best experts on this subject based on the ideXlab platform.
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utilization of lime for stabilizing soft clay soil of high Organic Content
Geotechnical and Geological Engineering, 2009Co-Authors: Mohamed A Sakr, Mohamed A Shahin, Yasser M MetwallyAbstract:This paper presents the results of geotechnical and mineralogical investigations on lime-treated soft clay soil from Idku City, Egypt, where high Organic matters of about 14% exist. Lime was added in the order of 1%, 3%, 5% and 7% by weight and laboratory experiments after 7, 15, 30 and 60 days were conducted including the mineralogical and microstructural examinations, grain size analysis, plasticity limits, unconfined compressive tests, vane shear tests and oedometer tests. The results indicate that soft clay soil of high Organic Content of 14% can be stabilized satisfactorily with the addition of 7% lime. The results also demonstrate that the changes in the mineralogical Contents and soil fabric of high Organic lime-treated soft clay improve soil plasticity, strength and compressibility.
Qing Zhao - One of the best experts on this subject based on the ideXlab platform.
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Organic Content influences sediment microbial fuel cell performance and community structure
Bioresource Technology, 2016Co-Authors: Qing ZhaoAbstract:Abstract This study constructed sediment microbial fuel cells (SMFCs) with different Organic loadings without the amendment of external substrates, and it investigated how such variation affects electricity generation and microbial community structure. Results found sediment characteristics significantly influenced SMFC performance and appropriate Organic Content is important to maintain stable power outputs. SMFCs with loss of ignition (LOI) of 5% showed the most reliable performance in this study, while high Organic Content (LOI 10–16%) led to higher but very unstable voltage output because of biogas accumulation and worm activities. SMFCs with low Organic Content (1–3%) showed low power output. Different bacterial communities were found in SMFCs shown various power generation performance even those with similar Organic Contents. Thermodesulfovibrionaceae was found closely related to the system startup and Desulfobulbaceae showed great abundance in SMFCs with high power production.
Raymond J. Zeng - One of the best experts on this subject based on the ideXlab platform.
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Comprehensive investigation of the relationship between Organic Content and waste activated sludge dewaterability.
Journal of Hazardous Materials, 2020Co-Authors: Hou-feng Wang, Hua-jie Wang, Ya-nan Bai, Xiao-fei Shen, Wei Zhang, Raymond J. ZengAbstract:Abstract The relationship between sludge Organic fraction and its dewaterability is well known in practice. However, the formal study to reveal the underlying reason is limited. To improve understanding of the nature of Organic Content on sludge dewatering process, this study systematically evaluated the effects of sludge Organic Content on its dewaterability and revealed the underlying mechanism. Analysis of 10 waste activated sludge (WAS) samples with varying Organic Contents showed that capillary suction time (CST) increased linearly from 34.90 ± 0.10 s to 104.90 ± 0.30 s (R2 = 0.92, p
Kaijun Wang - One of the best experts on this subject based on the ideXlab platform.
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Enhanced anaerobic digestion of waste activated sludge of low Organic Content in a novel digester
Water Science and Technology, 2015Co-Authors: Y. Jiang, Z. P. Cao, Jiane Zuo, Kaijun WangAbstract:A novel digester, termed an internal circulation anaerobic digester (ICAD), was developed to intensify sludge digestion. It consists of reaction zone, settling zone, thickening zone, riser and downcomer. Internal circulation in the digester is intensified by backflow biogas. The mesophilic ICAD treating thermal pretreated waste activated sludge with volatile suspended solids (VSS)/suspended solids (SS) of 0.45–0.49 was conducted in this study to reduce and stabilize the low Organic Content sludge. The results showed that the VSS removal rate and biogas rate reached 46.0% and 0.72 m3/kg VSSfed at hydraulic retention time (HRT) of 15 days. VSS/SS and soluble chemical oxygen demand (SCOD) of the effluent sludge ranged from 0.39 to 0.41 and 274 mg/L to 473 mg/L, respectively, under various HRTs from 10 to 27 days. The degradation ability of ICAD derived from the improved mass transfer by internal circulation and long solid retention time at short HRT is compared with continuous stirred tank reactor.
