摘要：

以苏州某印染废水处理厂气浮段出水为研究对象，通过批次反应模拟污水处理厂的好氧曝气池工艺，探讨了金属锑对活性污泥去除印染废水中COD和NH₃-N的影响，评价了不同锑质量浓度下活性污泥对其的处理效能，并研究了不同锑质量浓度下生化反应前后污泥浓度变化规律。结果表明，废水中的锑可显著抑制COD和NH₃-N的去除，在进水COD为309.2 mg/L、NH₃-N为6.54 mg/L的条件下，当锑质量浓度由0.05 mg/L升高至2.05 mg/L时，COD去除率由82.1%降至35.6%，NH₃-N去除率由74.6%降至40.5%。活性污泥可去除一部分的锑，且随着锑质量浓度的增加，活性污泥对锑的处理效能先增加后降低之后保持稳定。活性污泥的剩余量与进水锑浓度显著相关，锑浓度越大，剩余污泥浓度越小，处理效果越差。模拟该废水处理厂实际运行工艺，在生化段后采用混凝工艺可进一步去除生化反应出水的COD及锑，当锑质量浓度为0.25 mg/L时，经好氧活性污泥-混凝（投加100 mg/L FeCl₃）处理后，出水COD为80.2 mg/L，而当锑质量浓度为0.05 mg/L时，经好氧活性污泥-混凝（投加100 mg/L FeCl₃）处理后，出水COD为38.0 mg/L，由此可见，为保障水质达标，利用好氧活性污泥-混凝法处理含有锑的印染废水时，进水锑的浓度需加以控制。

关键词: 锑, 活性污泥, 印染废水, 混凝

Abstract:

Taking the effluent from the air flotation section of a printing and dyeing wastewater treatment plant in Suzhou as the research object，the batch reaction was used to simulate the aerobic aeration tank process of the wastewater treatment plant. The effect of metal antimony on the removal of COD and NH₃-N from printing and dyeing wastewater by activated sludge was discussed，the treatment efficiency of activated sludge under different antimony mass concentrations was evaluated，and the sludge concentration before and after biochemical reaction under different antimony mass concentrations was studied. The results showed that antimony in the wastewater could significantly inhibit the removal of COD and NH₃-N. Under the conditions of influent COD of 309.2 mg/L and NH₃-N of 6.54 mg/L，the COD and NH₃-N removal rate decreased from 82.1% to 35.6% and 74.6% to 40.5% when the antimony mass concentration increased from 0.05 mg/L to 2.05 mg/L. Activated sludge could remove part of antimony， and with the increase of antimony mass concentration， the treatment efficiency of activated sludge for antimony first increased， then decreased， and then remained stable. The residual amount of activated sludge was significantly correlated with the influent antimony concentration，with the larger the antimony concentration，the smaller the residual sludge concentration and the worse the treatment effect. Furthermore，by simulating the actual operation process of the wastewater treatment plant，the COD and antimony could be further removed with coagulation process followed by the biochemical section. When the mass concentration of antimony was 0.25 mg/L，the effluent COD was 80.2 mg/L after treatment by aerobic activated sludge-coagulation（with 100 mg/L FeCl₃），while when antimony was 0.05 mg/L，the effluent COD was 38.0 mg/L. It could be seen that in order to ensure that the water quality met the standard，the concentration of antimony in the influent needed to be controlled when the printing and dyeing wastewater containing antimony was treated by aerobic activated sludge-coagulation method.

Key words: antimony, activated sludge, printing and dyeing wastewater, coagulation

中图分类号: 

• X703.1