The Experts below are selected from a list of 71523 Experts worldwide ranked by ideXlab platform
Xuejiang Wang - One of the best experts on this subject based on the ideXlab platform.
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nutrients removal from municipal wastewater by Chemical Precipitation in a moving bed biofilm reactor
Process Biochemistry, 2006Co-Authors: Nicole Jaffrezic Renault, Xuejiang Wang, Ling Chen, Jianfu Zhao, Jean-marc ChovelonAbstract:In this study, a combined Chemical Precipitation and moving bed biofilm system was used to treat municipal wastewater. The moving bed biofilm reactor (MBBR) has been tested for nitrogen removal through simultaneous nitrification and denitrification (SND). The SND could be successfully established at DO of about 2 mg/l, and about 89.9% of total nitrogen (TN) removal efficiency through SND had been achieved in the system. Iron(II) sulphate heptahydrate solution was dosed onto the top of MBBR at varying ratios of total phosphorus to iron(II). The performance of the system with respect to BOD, COD, TN removal was not significantly affected by Chemical dosing. The phosphorus removal efficiency increased with increasing dose. To meet EC requirements, the most favourable Chemical dosing ratio was 1:1.3 (weight ratio P:Fe). The combination of highly efficient nitrogen removal, obtainable in a MBBR and effective phosphorus removal by Chemical Precipitation with iron(II) should be an ideal option for the total nutrient removal from municipal wastewater.
Hanife Buyukgungor - One of the best experts on this subject based on the ideXlab platform.
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sulfide removal in petroleum refinery wastewater by Chemical Precipitation
Journal of Hazardous Materials, 2008Co-Authors: Levent Altas, Hanife BuyukgungorAbstract:Abstract Sulfide removal by Chemical Precipitation from petroleum refinery wastewater was investigated. The wastewater samples were taken from the flocculation pond influent of TUPRAŞ Kirikkale Middle Anatolia Petroleum Refinery Wastewater Treatment Plant (WWTP) and physicoChemical treatments using conventional coagulants which were partial precipitant [FeCl 3 ·6H 2 O and FeSO 4 ·7H 2 O] and coagulant-aids [Ca(OH) 2 and CaCO 3 ] were applied to both raw and sulfide added wastewater. Sulfide and Chemical oxygen demand (COD) removal efficiencies of Fe 3+ ions alone for sulfide added wastewaters having different pH values varied between 62–95 and 45–75%, respectively. In addition, removal efficiencies of sulfide (96–99%) and COD (50–80%) were obtained by using Fe 2+ ions together with Ca(OH) 2 as precipitant-aid under the same conditions. In experiments performed with raw wastewater which had different pH values, COD removal efficiencies of Fe 3+ and Fe 2+ ions together with Ca(OH) 2 , were 50–80 and 32–50%, respectively.
Levent Altas - One of the best experts on this subject based on the ideXlab platform.
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sulfide removal in petroleum refinery wastewater by Chemical Precipitation
Journal of Hazardous Materials, 2008Co-Authors: Levent Altas, Hanife BuyukgungorAbstract:Abstract Sulfide removal by Chemical Precipitation from petroleum refinery wastewater was investigated. The wastewater samples were taken from the flocculation pond influent of TUPRAŞ Kirikkale Middle Anatolia Petroleum Refinery Wastewater Treatment Plant (WWTP) and physicoChemical treatments using conventional coagulants which were partial precipitant [FeCl 3 ·6H 2 O and FeSO 4 ·7H 2 O] and coagulant-aids [Ca(OH) 2 and CaCO 3 ] were applied to both raw and sulfide added wastewater. Sulfide and Chemical oxygen demand (COD) removal efficiencies of Fe 3+ ions alone for sulfide added wastewaters having different pH values varied between 62–95 and 45–75%, respectively. In addition, removal efficiencies of sulfide (96–99%) and COD (50–80%) were obtained by using Fe 2+ ions together with Ca(OH) 2 as precipitant-aid under the same conditions. In experiments performed with raw wastewater which had different pH values, COD removal efficiencies of Fe 3+ and Fe 2+ ions together with Ca(OH) 2 , were 50–80 and 32–50%, respectively.
Haiming Huang - One of the best experts on this subject based on the ideXlab platform.
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recovery of phosphate and ammonia nitrogen from the anaerobic digestion supernatant of activated sludge by Chemical Precipitation
Journal of Cleaner Production, 2015Co-Authors: Haiming Huang, Li DingAbstract:Abstract This paper presents a study of the method used in recovering P T (the total orthophosphate) from the anaerobic digestion supernatant of sludge via Chemical Precipitation. The P T recovery efficiencies of three metal salts (AlCl 3 , CaCl 2 and MgCl 2 ) at different pHs were investigated. The results indicated that the pH of the solution exerts a significant effect on the P T recovery by Chemical Precipitation. The preference order of the three metal salts for the phosphate recovery is MgCl 2 > CaCl 2 > AlCl 3 at the optimal pH range. Moreover, the phosphate precipitate of MgCl 2 has a better settleability compared with those of AlCl 3 and CaCl 2 . The alkalinity of the supernatant exerts a significantly negative effect on the phosphate Precipitation of CaCl 2 and MgCl 2 , especially on that of CaCl 2 . When the alkalinity increased from 0 mg/L to 1968 mg/L, the P T recovery efficiency of CaCl 2 decreased from 94% to 85.4%. To overcome this problem, the CO 2 degasification technique was used in the Chemical Precipitation. The effect of the alkalinity was then found to be almost completely eliminated at an airflow rate of 8 L/min and a stripping time of over 60 min. The results of the experiments of air stripping combined with struvite Precipitation using low-cost MgO showed that it is possible to recover approximately 100% of P T and 50% of the Total Ammonia Nitrogen (TAN) from the supernatant. An economic evaluation revealed that the P T recovery cost of the combined process was $ 0.38 per kg P T , which was far lower than that of extracting P from phosphate rock.
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Treatment of anaerobic digester effluents of nylon wastewater through Chemical Precipitation and a sequencing batch reactor process.
Journal of Environmental Management, 2012Co-Authors: Haiming Huang, Qianwu Song, Wenjun Wang, Jiankun DaiAbstract:Abstract Chemical Precipitation, in combination with a sequencing batch reactor (SBR) process, was employed to remove pollutants from anaerobic digester effluents of nylon wastewater. The effects of the Chemicals along with various Mg:N:P ratios on the Chemical Precipitation (struvite Precipitation) were investigated. When brucite and H 3 PO 4 were applied at an Mg:N:P molar ratio of 3:1:1, an ammonia-removal rate of 81% was achieved, which was slightly more than that (80%) obtained with MgSO 4 ·7H 2 O and Na 2 HPO 4 ·12H 2 O at Mg:N:P molar ratios greater than the stoichiometric ratio. To further reduce the ammonia loads of the successive biotreatment, an overdose of phosphate with brucite and H 3 PO 4 was applied during Chemical Precipitation. The ammonia-removal rate at the Mg:N:P molar ratio of 3.5:1:1.05 reached 88%, with a residual PO 4 –P concentration of 16 mg/L. The economic analysis showed that the Chemical cost of Chemical Precipitation could be reduced by about 41% when brucite and H 3 PO 4 were used instead of MgSO 4 ·7H 2 O and Na 2 HPO 4 ·12H 2 O. The subsequent biological process that used a sequencing batch reactor showed high removal rates of contaminants. The quality of the final effluent met the requisite effluent-discharging standards.
Jean-marc Chovelon - One of the best experts on this subject based on the ideXlab platform.
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nutrients removal from municipal wastewater by Chemical Precipitation in a moving bed biofilm reactor
Process Biochemistry, 2006Co-Authors: Nicole Jaffrezic Renault, Xuejiang Wang, Ling Chen, Jianfu Zhao, Jean-marc ChovelonAbstract:In this study, a combined Chemical Precipitation and moving bed biofilm system was used to treat municipal wastewater. The moving bed biofilm reactor (MBBR) has been tested for nitrogen removal through simultaneous nitrification and denitrification (SND). The SND could be successfully established at DO of about 2 mg/l, and about 89.9% of total nitrogen (TN) removal efficiency through SND had been achieved in the system. Iron(II) sulphate heptahydrate solution was dosed onto the top of MBBR at varying ratios of total phosphorus to iron(II). The performance of the system with respect to BOD, COD, TN removal was not significantly affected by Chemical dosing. The phosphorus removal efficiency increased with increasing dose. To meet EC requirements, the most favourable Chemical dosing ratio was 1:1.3 (weight ratio P:Fe). The combination of highly efficient nitrogen removal, obtainable in a MBBR and effective phosphorus removal by Chemical Precipitation with iron(II) should be an ideal option for the total nutrient removal from municipal wastewater.