首页> 外文会议>European Symposium on Environmental Biotechnology(ESEB 2004); 20040425-20040428; Oostende; BE >Influence of hydraulic retention time and sulfide toxicity on sulfidogenic FBR
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Influence of hydraulic retention time and sulfide toxicity on sulfidogenic FBR

机译:水力停留时间和硫化物毒性对硫化生FBR的影响

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The influence of hydraulic retention time (HRT) and sulfide toxicity on ethanol and acetate oxidation were studied in a sulfate-reducing fluidized-bed reactor (FBR) treating acidic metal-containing waste-water. Incomplete acetate oxidation restricted the operation of the FBR at HRTs below 6.5 h, since the alkalinity produced by acetate oxidation is necessary for wastewater neutralization. At a HRT of 6.5 h, Zn and Fe precipitation rates were over 600 mg l~(-1)d~(-1) and 300 mg l~(-1)d~(-1), respectively, and the alkalinity produced by substrate utilization increased the wastewater pH from 3 to 7.9-8.0. Both uncompetitive and noncompetitive inhibition models described well the sulfide inhibition of the sulfate-reducing culture. Dissolved sulfide inhibition constants (K;) for ethanol and acetate oxidation were 225-248 mg S l~(-1) and 338-356 mg S l~(-1), respectively, and the corresponding K_i values for H_2S were 76-84 mgS l~(-1) and 118-124 mg S l~(-1).
机译:在硫酸盐还原流化床反应器(FBR)中处理含酸性金属的废水,研究了水力停留时间(HRT)和硫化物毒性对乙醇和乙酸盐氧化的影响。乙酸盐的不完全氧化限制了FBR在6.5 h以下的HRT上的运行,因为乙酸盐氧化产生的碱度对于废水中和是必需的。在6.5 h的HRT下,Zn和Fe的沉淀速率分别超过600 mg l〜(-1)d〜(-1)和300 mg l〜(-1)d〜(-1),并且产生了碱度通过底物的利用,废水的pH从3增加到7.9-8.0。非竞争性和非竞争性抑制模型都很好地描述了硫酸盐还原培养物的硫化物抑制。乙醇和乙酸盐氧化的溶解硫化物抑制常数(K;)分别为225-248 mg S l〜(-1)和338-356 mg S l〜(-1),相应的H_2S K_i值为76- 84 mg S l〜(-1)和118-124 mg S l〜(-1)。

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