水泥窑协同处置印染废水污泥的优化脱水方式

Optimized dehydrating method of dyeing sludge with cement kiln co-treatment

水泥窑协同处置印染废水污泥,可利用污泥中的热值与有用组分。但污泥浓缩脱水后含水率仍在80%左右,直接进水泥窑处置会消耗大量热量,影响水泥生产正常工况。对不同脱水方式的分析比较发现,机械深度脱水和石灰稳定脱水方式,工艺过程和操作相对简单、效果稳定;间接干化和直接-间接联合干化方式,能有效避免污泥干化时臭气对环境的影响;将这二者组合,能够降低协同处置过程中烘干阶段及入窑后的热力成本,可为水泥工业协同处置印染废水污泥提供技术参考。

Heat value and useful components of dyeing sludge can be reused with the combined pro- cess of cement kiln and dyeing sludge. However, the moisture of dyeing sludge is about 80% after the mechanical dehydrating units, which consumes a lot of energy resource in cement kiln. Different dewa- tering processes are compared, and the results depict that mechanical deeply dewatering and lime stabilization are of relatively simple operation and stable effect. Indirect drying and direct-indirect joint drying can effectively avoid the odor-problems. Therefore, the combined process of deep dewatering or lime stabilization and direct-indirect joint drying can reduce heating cost of drying and incineration process. The study provides a reference for dyeing sludge depth dehydration and the combined treating process of cement industry.