聚磷活性污泥处理含铅废水的效能

THE EFFICIENCY OF TREATING LEAD-BEARING WASTEWATER WITH THE PHOSPHORUS-ACCUMULATING SLUDGE

采用聚磷活性污泥分别与硝酸铅、醋酸铅组成反应体系,反应体系处于厌氧状态,采集上清液测定铅含量,并测定残余污泥中铅的形态。结果表明:聚磷活性污泥对铅具有很好的去除效果,随时间的增加,铅的去除率呈增加的趋势,实验结束时(32 d),铅的去除率可达99.8%。且污泥中的铅是稳定的,主要含有机物及硫化物结合态铅、残渣态铅,其中残渣态铅占50%以上,主要由磷酸铅组成。

The phosphorus-accumulating sludge was used to react with the lead nitrate and the lead acetate respectively.The reaction system is anaerobic.The concentration of lead was determined by supernatant.The forms of leads in the residual sludge was determined.The results showed that the phosphorus accumulating sludge had good effect on removing of lead.The removing rate of lead was increased with time.The removal rate of lead was up to 99.8% when the experiment was finished.The lead in the residual sludge was stable and presented as the leads combinated by organic and sulfide and the residual lead,of which residual lead was over 50%,which was largely made up of lead phosphate.