低品位电镀污泥对氧化亚铁硫杆菌活性的影响

以氧化亚铁硫杆菌（Thiobacillus ferroxidans,以下简称T.f菌）和低品位电镀污泥（干污泥中主要重金属组分低于3%的电镀污泥,以下简称污泥）为主要实验材料,研究了不同污泥浓度、初始pH对T.f菌Fe2＋氧化速率的影响。将实验组中T.f菌重新接种于新鲜9 K液体培养基,以考察T.f菌经实验处理后对新鲜9 K液体培养基中Fe2＋的氧化能力,结果表明,低品位电镀污泥对T.f菌Fe2＋氧化速率具有显著抑制作用,2.5 g/L的污泥浓度即可使T.f菌Fe2＋氧化速率由23.86 mg/（mL·h）降低至10.72 mg/（mL·h）;调节溶液初始pH,可有限改善T.f菌在低污泥浓度条件下的Fe2＋氧化速率,但在较高污泥浓度时,对其Fe2＋氧化速率无促进作用。

Effect of low grade electroplating sludge on bioactivity of Thiobacillus ferroxidans

In this study,Thiobacillus ferroxidans and low grade electroplating sludge were main experimental materials.The oxidation rate of Fe2 ＋by Thiobacillus ferroxidans under the condition with different concentrations of low grade electroplating sludge and changing the initial pH of the treatment groups was studied.There were eight treatments in this experiment,and four treatments＇ initial pH were adjusted to 2.5.The results showed that low grade electroplating has significant inhibitory effect on the oxidation rate of Fe2 ＋by Thiobacillus ferroxidans,it can decrease the oxidation rate of Fe2 ＋from 23.86 mg /（mL·h） to 10.72 mg /（mL· h） with concentration of 2.5 g / L.Adjusting the initial pH of the solution could ameliorate the oxidation rate of Fe2 ＋by Thiobacillus ferroxidans in low concentration of electroplating sludge,but no promoting at higher concentrations.