Effects of loading rate and hydraulic residence time on anoxic sulfide biooxidation  

作　　者：MAHMOOD Qaisar ISLAM Ejazul 

机构地区：[1]Department of Environmental Engineering,Zhejiang University

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2007年第7期1149-1156,共8页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：Project supported by the National Natural Science Foundation of China (No. 30070017);the Science and Technology Foundation for Key Project of Zhejiang Province (No. 2003C13005), China

摘　　要：The optimal operation conditions in an anoxic sulfide oxidizing (ASO) bioreactor were investigated. The maximal removal rates for sulfide and nitrate were found to be 4.18 kg/(m3·d) and 1.73 kg/(m3·d), respectively. The volumetrical volumetric loading rates (LRs) observed through decreasing hydraulic retention time (HRT) at fixed substrate concentration are higher than those by increasing substrate concentration at fixed HRT. The sulfide oxidation in ASO reactor was partially producing both sulfate and sulfur; but the amount of sulfate produced was approximately one third that of sulfur. The process was able to tolerate high sulfide concentration, as the sulfide removal percentage always remained near 99% when influent concentration was up to 580 mg/L. It tolerated relatively lower nitrate concentration because the removal percentage dropped to 85% when influent con- centration was increased above 110 mg/L. The process can tolerate shorter HRT but careful operation is needed. Nitrate conversion was more sensitive to HRT than sulfide conversion since the process performance deteriorated abruptly when HRT was decreased from 3.12 h to 2.88 h. In order to avoid nitrite accumulation in the reactor, the influent sulfide and nitrate concentrations should be kept at 280 mg/L and 67.5 mg/L respectively. Present biotechnology is useful for removing sulfides from sewers and crude oil.The optimal operation conditions in an anoxic sulfide oxidizing （ASO） bioreactor were investigated. The maximal removal rates for sulfide and nitrate were found to be 4.18 kg/（m^3·d） and 1.73 kg/（m^3·d）, respectively. The volumetrical volumetric loading rates （LRs） observed through decreasing hydraulic retention time （HRT） at fixed substrate concentration are higher than those by increasing substrate concentration at fixed HRT. The sulfide oxidation in ASO reactor was partially producing both sulfate and sulfur; but the amount of sulfate produced was approximately one third that of sulfur. The process was able to tolerate high sulfide concentration, as the sulfide removal percentage always remained near 99% when influent concentration was up to 580 mg/L. It tolerated relatively lower nitrate concentration because the removal percentage dropped to 85% when influent concentration was increased above 110 mg/L. The process can tolerate shorter HRT but careful operation is needed. Nitrate conversion was more sensitive to HRT than sulfide conversion since the process performance deteriorated abruptly when HRT was decreased from 3.12 h to 2.88 h. In order to avoid nitrite accumulation in the reactor, the influent sulfide and nitrate concentrations should be kept at 280 mg/L and 67.5 mg/L respectively. Present biotechnology is useful for removing sulfides from sewers and crude oil.

关 键 词：Anaerobic processes Anoxic nitrate removal BIODESULFURIZATION BIOTRANSFORMATION Fluidized bed bioreactors Hydraulic residence time （HRT） 

分 类 号：X703[环境科学与工程—环境工程]