“二段法”干化工艺在中国城市污泥处置中的应用和实践

THE APPLICATION AND PRACTICE OF TWO-PHASE SLUDGE DRYING TECHNOLOGY IN CHINA'S MUNICIPAL SLUDGE DISPOSAL

目前我国城市污水厂产生的湿污泥数量巨大,但大多未能得到安全处置。污泥干化作为解决城市污泥最终减量化、无害化、稳定化和资源化的重要处理方式,近年来得到广泛推广。与其他污泥干化工艺相比,"二段法"干化工艺在能耗、安全性等方面具有明显优势,越来越受到国内外的青睐。但另一方面,某些地区的污泥出现纤维含量高、易混入硬物、黏性高等问题,又阻碍其生产稳定运行。通过苏州工业园区污泥干化项目的实践,因地制宜,对"二段法"干化工艺在运行中出现的问题采取了针对性改进措施,实现了生产连续稳定运行。

There is a huge amount of wet sludge produced by sewage treatment plants in China. However,most of them is not treated in a safe way. Sludge drying,which realizes the quantity reduction,harmless treatment,stabilization and recycling has been widely promoted in recent years. Compared with other sludge drying technologies,two-phase sludge drying technology has obvious advantage in energy consumption and safety and becomes more and more popular both in China and abroad. On the other hand,due to some problems such as high fiber content and viscosity,hard objects in the sludge from some areas,the steady running of this technology is affected. Through the practice of sludge drying project in Suzhou Industrial Park,it was taken the pertinent measures under the consideration of local conditions,and the problems in the operation of the drying process were solved. In consequence,the continuous and stable operation of the production had been realized.