| Effects of loading rate and hydraulic residence time on anoxic sulfide biooxidation |
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| 作者姓名： | CAI Jing ZHENG Ping MAHMOOD Qaisar ISLAM Ejazul HU Bao-lan WU Dong-lei |
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| 作者单位： | Department of Environmental Engineering Zhejiang University，Department of Environmental Engineering，Zhejiang University，Hangzhou 310029 China，Hangzhou 310029 China |
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| 基金项目： | 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 |
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| 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.
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| 关 键 词： | 厌氧技术 硝酸盐 生物转换 处理技术 |
| 收稿时间： | 4 December 2006 |
| 修稿时间： | 2006-12-042007-03-12 |
Effects of loading rate and hydraulic residence time on anoxic sulfide biooxidation |
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| CAI Jing ZHENG Ping MAHMOOD Qaisar ISLAM Ejazul HU Bao-lan WU Dong-lei.Effects of loading rate and hydraulic residence time on anoxic sulfide biooxidation[J].Journal of Zhejiang University Science,2007,8(7):1149-1156. |
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| Authors: | Cai Jing Zheng Ping Mahmood Qaisar Islam Ejazul Hu Bao-lan Wu Dong-lei |
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| Institution: | (1) Department of Environmental Engineering, Zhejiang University, Hangzhou, 310029, China |
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| Abstract: | 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 volumetri 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.
Project supported by the National Natural Science Foundation of China (No. 30070017) and the Science and Technology Foundation
for Key Project of Zhejiang Province (No. 2003C13005), China |
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| Keywords: | Anaerobic processes Anoxic nitrate removal Biodesulfurization Biotransformation Fluidized bed bioreactors Hydraulic residence time (HRT) |
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