某污水处理厂污泥的毒性及盆栽试验的研究

Study on the Toxicity and Potted Test of Sludge from A Sewage Treatment Plant

对某污水处理厂一级处理后污泥（下称污泥）中综合毒物对大、小鼠的急性毒性和致突变性以及污泥中重金属元素在培栽后农作物中的分布和含量进行了研究，结果：污泥水对大鼠的急性毒性试验ＬＤ５０＝１００００ｍｇ／ｋｇ；小鼠骨髓细胞微核试验各组间与阴性对照组比较无显著性差别。重金属元素通过蚕豆盆栽试验结果提示：蚕豆茎、叶、果实部分铅、镉、铬、铜含量与对照组相近似且果实中含量都小于食物中允许浓度。参照土地改良中污泥的施加量，笔者认为：污泥占２０％的比例应用于农田可以栽种农作物。

A study on the rats and mice acute toxicity test and mutagenicity of synthetic poison in sludge from a sewage treatment Plant,as well as the distribution and content of heavy metal in crops growing in the sludge.The results show that the LD50 of the rats acute toxicity test is 10000mg/kg,there is no significant difference between dosage groups and control group in the micronucleus test in mice bone marrow.The broad bean potted test shows that the element content(lead.Cadmium,manganese,copper)in broad bean,s stem,leaves and fruit hasn't significant difference compared with control group, and moreover the element content in fruit is lower than the food allowable contentration.Refer to the sludge added volume of the soil improvement,we suggest that the sludge apply to growing crops by 20 percent.