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城市下水污泥是城市污水处理的产物。随着城市的发展和污水处理厂的建设,污泥的产量将不断增加。如何处理处置和合理利用污泥已成为城建、环保、农业等部门均为关切的问题。本文仅就城市污水污泥对农田和作物的影响以及处理与利用途径作如下探讨。一、污水污泥对农田和作物的影响 1.污水污泥是十分宝贵的肥源城市下水污泥含有比较丰富的有机质(含量在20—40％左右),以及作物所需的常量营养元素(一般含N3-6％,P2％、K0.3％左右)和必需的微量元素(Cu、Zn、Fe、Mn、B、Mo等)。按N、P、K主要营养物质的总量计算,1吨城市污水污泥大约
Urban sewage sludge is the product of urban sewage treatment. With the development of the city and the construction of sewage treatment plants, sludge production will continue to increase. How to deal with and treat sludge reasonably has become a concern for urban construction, environmental protection and agriculture. This article only on the impact of urban sewage sludge on farmland and crops as well as ways to deal with and use the following discussion. First, the impact of sewage sludge on farmland and crops 1. Sewage sludge is very valuable Fertilizer City Sewage sludge contains rich organic matter (content of about 20-40%), as well as the required nutrients for crops ( Generally containing N3-6%, P2%, K0.3% or so) and the necessary trace elements (Cu, Zn, Fe, Mn, B, Mo, etc.). According to the total amount of N, P, K main nutrients, 1 ton of municipal sewage sludge is about