【摘要】 针对城市污水农灌中存在的重金属污染问题,采用活性污泥法试验研究汞、铅及镉的去除率。试验表明,重金属去除率与污水的初始浓度成正比。在试验条件下,当汞和铅的原水浓度达到污水排入城市下水道水质标准时,去除率在70%以上,出水满足农业灌溉水质标准。镉虽有一定的去除效果,但是出水很难满足农灌标准。更多还原

【Abstract】 In the light of the problem that heavy metal pollution in municipal sewage irrigation,activated sludge method is used to study the removal efficiency of heavy metals(Hg,Pb,Cd).The results showed that the removal efficiency of heavy metals was proportional to the initial contents in the influent wastewater.Under experimental conditions,when initial contents of Hg and Pb reach the water quality standards for municipal sewer sewage,the removal efficiency is beyond 70%,and the effluent can reach the water quality standards for agricultural irrigation.As for Cd,though it has some removal efficiency,the effluent can hardly reach the water quality standards for agricultural irrigation.更多还原