求翻译：污水厂污泥通常是一种异构的固体物质，是城市污水处理的副产品，随着城市污水厂建设的发展，污泥的产量不断增加，对污泥的环境质量要求越来越严峻，污泥处理和处置的任务也日益繁重。近年来世界各国围绕着如何处置和有效地利用污泥作了大量试验和工作。在污水处理过程中，污泥是带有大量污染的污水处理副产品是什么意思？

Sewage sludge is usually a heterogeneous solid material, the urban sewage treatment by-products, with the municipal wastewater treatment plant construction, increasing sludge production, sludge and more severe the environmental quality requirements, pollution sludge treatment and disposal of the inc

sludge from wastewater treatment plant is usually a heterogeneous of solid material, and the urban sewage treatment of urban sewage treatment plant construction by-products, with the development of sewage sludge, increasing production of sludge, the quality of the environment is increasingly critica

The sewage factory sludge is usually one kind of isomerism solid matter, is the city sewage treatment sideline product, along with the city sewage factory construction development, the sludge output increases unceasingly, is more and more stern to the sludge environment quality request, sludge proce

Sewage sludge is usually a heterogeneous solids, is a by-product of municipal wastewater treatment, with the development of urban wastewater treatment plant construction, increasing yield of sludge, sludge quality requirements become more stringent, sludge treatment and disposal are also increasingl

Sewage sludge is usually a heterogeneous solids, is a by-product of municipal wastewater treatment, with the development of urban wastewater treatment plant construction, increasing yield of sludge, sludge quality requirements become more stringent, sludge treatment and disposal are also increasingl