硫酸盐生物还原法处理含锌废水

研究了用硫酸盐还原菌处理含锌废水的污泥床工艺及影响运行的主要因素，结果表明，该工艺可在进水ＣＯＤ和锌浓度分别为３２０ｍｇ／Ｌ与１００ｍｇ／Ｌ时有效运行，有机物和Ｚｎ＾２＋的去除率分别以７３．８％和９９．６３％，大水力滞留时间降至６ｈ时，Ｚｎ＾２＋的去除率仍可达９４．５５％，进水Ｚｎ＾２＋浓度低于５００ｍｇ／Ｌ，时装置可以稳定运行，而当浓度达到６００ｍｇ／Ｌ时，硫酸盐原菌受到Ｚｎ＾２＋的明显毒害。当

Treatment of Zn2+ Contaminated Wastewater with a Method of Sulfate Bio-reduction

A process for the treatment of Zn2+ containing wastewater by sulfate-reducing bacteria in an upflow anaerobic sludge bed reactor has been studied. When the concentrations of COD and Zn2in influent were 320 mg/L and 100 mg/L, respectively, the reactor could be successfully operated. Under this condition the removal rates of COD and Zn2+ were 73.8% and 99.8% respectively. When the concentration of Zn2+ was less than 500 mg/L the reactor was operated successfully. Whereas when the Zn2+ concentration in influent was higher than 500 mg/L the activity of the sulfate-reducing bacteria was suppressed by Zn2+. When the Zn2+ concentration was 500 mg/L and the retention time was 9 h, the reactor had a volume removal rate of Zn2+ reaching as high as 1329 mg/(L.d).