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Journal of Zhejiang University SCIENCE A 2007 Vol.8 No.7 P.1149-1156


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

Author(s):  CAI Jing, ZHENG Ping, MAHMOOD Qaisar, ISLAM Ejazul, HU Bao-lan, WU Dong-lei

Affiliation(s):  Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, China

Corresponding email(s):   blhu@zju.edu.cn

Key Words:  Anaerobic processes, Anoxic nitrate removal, Biodesulfurization, Biotransformation, Fluidized bed bioreactors, Hydraulic residence time (HRT)

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 A, 2007, 8(7): 1149-1156.

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journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

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%T Effects of loading rate and hydraulic residence time on anoxic sulfide biooxidation
%A CAI Jing
%A ISLAM Ejazul
%A HU Bao-lan
%A WU Dong-lei
%J Journal of Zhejiang University SCIENCE A
%V 8
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%P 1149-1156
%@ 1673-565X
%D 2007
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2007.A1149

T1 - Effects of loading rate and hydraulic residence time on anoxic sulfide biooxidation
A1 - CAI Jing
A1 - ZHENG Ping
A1 - MAHMOOD Qaisar
A1 - ISLAM Ejazul
A1 - HU Bao-lan
A1 - WU Dong-lei
J0 - Journal of Zhejiang University Science A
VL - 8
IS - 7
SP - 1149
EP - 1156
%@ 1673-565X
Y1 - 2007
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.2007.A1149

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 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.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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