净水厂生产废水回用中丙烯酰胺的风险控制

Risk control of acrylamide in wastewater reuse of waterworks

以西安市某地表水厂为例,针对生产废水回用后出厂水中丙烯酰胺含量超标问题,进行了相关的风险控制研究.研究结果表明:对不同浓度的污泥,投加阴离子型和阳离子型PAM均能有效降低污泥比阻值,改善污泥的脱水性能,但使用阴离子型PAM,出厂水丙烯酰胺含量更低.综合考虑污泥脱水效果及脱水分离液中丙烯酰胺的残留量,采用阴离子型PAM,投药量在0.09～0.16g/L之间时,可有效控制出厂水中丙烯酰胺含量超标的风险.

Taking the major urban surface source water plant in Xi＇an as object, the paper carried out a study on the risk control of acrylamide content. The results showed that PAM of both cation type and anion type can be used to improve the performance of sludge dewatering. Although the dewatering performance was improved at similar levels, the residual ac- rylamide monomer in the effluent was lower using PAM of anion type. To meet the purposes of small specific resistance to filtration of sludge and low residual acrylamide monomer in the supernatant, it is recommended to use anion type PAM. As the optimum PAM dosages were 0.09 g/L-0.16 g/L for the water supply plant, the risk of acrylamide monomer in the effluent would be decreased if the above optimum PAM dosages were used in the wastewater treatment process.