突发性水污染事件中镍的去除研究

在模拟突发性水污染事件镍的去除的试验中,研究pH值、絮凝剂FeCl3投加量、助凝剂PAM的投加与否对镍的去除效果的影响。试验结果表明,当原水中镍的质量浓度为0.226mg/L时,调节pH值为10.0,FeCl3投加量为25mg/L时沉淀出水的镍的质量浓度为0.0187mg/L,达到《城市供水水质标准》(CJ/T20-2005)中对镍含量的要求。镍的去除率随着pH值的升高,絮凝剂FeCl3投加量的增多而提高,过滤对镍有很好的去除作用。投加一定量的PAM有助于镍的去除。

Removal of nickel when unexpected water pollution event happens

Through the test simulating the nickel removal when unexpected water pollution event happens,the effects of pH value,dosage of FeCl3,coagulant-aid PAM adding or not on the nickel removal were studied.The results of the test showed that,when the mass concentration of nickel in raw water was 0.226 mg/L,after adjusting pH value to 10.0 and adding 25 mg/L of FeCl3,the mass concentration of nickel in the effluent water from the sedimentation tank was 0.018 7 mg/L,which satisfied the requirement of water quality standard for urban water supply(CJ/T 20-2005),the removal rate of nickel increased with the increasing of pH value and FeCl3 dose,filtration was very good for nickel removal,and besides,adding certain amount of PAM benefited the nickel removal.