生态沟渠中盘培牧草去除养猪场废水中重金属Cu、Zn和Cd效果的研究

针对浙江省杭嘉湖区域养猪场废水排放所造成的农田和水环境中重金属污染日渐严重的状况,本研究构建了以盘培牧草为主要内容的生态沟渠来降解流经沟渠的养猪场废水,观测了养猪场废水中重金属含量在盘培高羊茅和盘培多花黑麦草所构成的生态沟渠中的沿程降解梯度变化。结果表明:盘培高羊茅对养猪场废水中的重金属污染物Cu、Zn、Cd的吸收降解能力都要强于多花黑麦草。在铺设盘培牧草的600 m沟渠中,3种重金属污染物指标在靠近污水入口处的300 m沟渠内降解速度较快,而在远离污水入口处的后300 m沟渠内变化幅度相对比较平缓。

Effects of Pasture Stripe in Ecological Ditches on Removal of Heavy Metal Cu, Zn and Cd in Piggery Wastewater

Aiming at the severity of heavy metal pollution in the field and river channel discharged from piggery wastewater of Hangjiahu district in Zhejiang province,the ecological ditches were constructed to purify the piggery wastewater flowing through the ditches,which were mainly composed of pasture stripes.The author inspected the changes of heavy metal content in piggery wastewater along the ditches treated with Festucaarund inacea stripes and with Lolium multiflorum stripes.The results showed that the ditch treated with Festucaarund inacea stripes had stronger capability of Absorption and degradation to Cu,Zn and Cd in piggery wastewater than that treated with Lolium multiflorum stripes.In the 600 m ditch which was mainly composed of pasture stripes,the degradation velocity of the ditch near the entrance to Cu,Zn and Cd in piggery wastewater was greater than that of the ditch away from the entrance.