湿地系统处理重金属废水后,系统截留金属主要被固定在基质填料层,占98%以上。基质的浸渍和冲淋实验表明,以物理吸附形式存在的可交换态重金属铜占截留总量的1.07%,说明系统内重金属得到很好的固定。但是在pH小于3.3的情况下,固定的金属铜和铅比较容易被再次溶出,发生污染转移。%More than 98% of the three heavy metals remained in the system were in the substrate filler.The result of the dipping and flushing experiment of the substrate treated by heavy metals wastewater showed that the heavy metals remained in the systems were immobilized well.The exchangeable heavy metal copper in physical absorption form accounting for 1.07% of total retention.However,under the condition of pH ≤ 3.3,the heavy metals immobilized,such as copper and lead,were easy to be released,and pollution transfer occurred.
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