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  • enhanced elementary sulfur recovery in integrated sulfate-reducing, sulfur-producing rector under micro-aerobic condition

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 548
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     biological treatment of sulfate-laden wastewater consists of two separate reactors to reduce sulfate to sulfide by sulfate-reducing bacteria (srb) and to oxidize sulfide to sulfur (s0) by sulfide oxidation bacteria (sob). to have srb + sob in a single reactor faced difficulty of low s0 conversion. this study for the first time revealed that dissolved oxygen (do) level can be used to manipulate srb + sob reactions in a single reactor. this work demonstrated successful operation of an integrated srb + sob reactor under micro-aerobic condition. at do = 0.10–0.12 mg l−1, since the activities of sob were enhanced by limited oxygen, the removal efficiency for sulfate reached 81.5% and the recovery of s0 peaked at 71.8%, higher than those reported in literature. at increased do, chemical oxidation of sulfide with molecular oxygen competed with sob so conversion of s0 started to decline. at do > 0.30 mg l−1 activities of srb were inhibited, leading to failure of the srb + sob reactor.

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