畜禽养殖场沼液重金属含量现状及安全性分析

Content and Security Analysis of Heavy Metals in Biogas Slurry Derived from Excrements of Livestocks

通过采集江西省4个地区13个县(市)畜禽养殖场的沼液,检测了其中Cu、Zn、Pb、Cd等4种元素的含量,分析了江西省畜禽养殖场沼液重金属污染的现状,结果表明:畜禽养殖场沼液中以Cu、Zn的含量较高,污染较严重,而且各采样点的Cu、Zn的污染程度基本表现出一致的趋势。因此,目前畜禽养殖场沼液农用灌溉存在较高的Cu、Zn污染风险,特别是Zn可能存在极高的污染风险;Pb、Cd的污染风险较低,其中Cd的污染风险大于Pb。

The biogas slurry,which was derived from the excrements of livestock and poultry,was collected from thirteen counties（cities） in four areas of Jiangxi province,their Cu,Zn,Pb and Cd contents were detected,and the current situation of heavy metal pollution due to livestock and poultry in Jiangxi province was analyzed. The results indicated that the contents of copper and zinc in all biogas slurry samples were higher than the contents of other heavy metal elements,thus the biogas slurry of livestock and poultry for agricultural irrigation could bring a great risk of copper pollution and a very serious risk of zinc pollution.In addition,there was a low risk of lead and cadmium pollution caused by the biogas slurry,but the risk of cadmium pollution was greater than that of lead pollution.