基于改造的浓缩带式压榨过滤机用于污泥深度脱水的试验研究
胡金财1，施 俊1，俞翔凯1，李永木1，赵 蕾2
（1.无锡市水务集团有限公司，江苏无锡 214000；2.中国市政工程中南设计研究总院有限公司，湖北武汉 430010）
摘 要 无锡市水务集团有限公司下属某污水处理厂采用“污泥均质池+浓缩带式压榨过滤机”的污泥处理工艺将污泥含水率降至80%后外运处置。针对该工艺产出的泥饼含水率高、泥饼重量大等问题，对其中一台进行深度脱水改造试验研究。改造过程不涉及土建问题，并充分利用了现状脱水机的压榨段，聚丙烯酰胺（PAM）投加系统，污泥投加系统等。新增的带式压榨过滤机与现有压榨段对接方便、快速，并能在较短工期内完成设备的拆旧、新设备的安装及改造后污泥脱水系统的调试运行。改造后污泥脱水系统产出的泥饼含水率可下降1~2个百分点。通过将铁盐投加改性，污泥可被深度脱水至含水率71%~73%，减量约30%，污泥减量效果显著。经成本分析，虽然投加铁盐会增加药剂成本，但可大幅减少污泥处置成本，从长远来看具有很大的经济效益。
关键词 带式压榨过滤机改造 污泥深度脱水 污泥减量 污泥含水率
Pilot Study of A Modified Thickening Belt Press Filter Based on Modification for Deep Sludge Dewatering
HU Jincai1, SHI Jun1, YU Xiangkai1, LI Yongmu1, ZHAO Lei2
（1. Wuxi Water Group Co., Ltd., Wuxi 214000, China）
（2. Central &, Southem China Municipal Engineering Design and Research institute Co, Ltd., Wuhan, 430010, China）
Abstract One wastewater treatment plant under Wuxi Water Group Co., Ltd. adopts the sludge treatment process of “sludge homogenization tank + thickening belt press filter” to reduce the water content of sludge to 80% and then transport it for disposal. Aiming at the problems of high water content and large weight of sludge cake produced by this process, one of the machines was subjected to a deep dewatering modification pilot study. The modification process does not involve any civil construction problems, and makes full use of the press section of the existing dewatering machine, the polyacrylamide (PAM) dosing system, and the sludge dosing system. The new belt press filter and the existing press section can be connected easily and quickly, and the dismantling of the equipment, the installation of the new equipment and the commissioning of the retrofitted sludge dewatering system can be completed within a short working period. The water content of the sludge cake produced by the modified sludge dewatering system can be reduced by 1~2 percentage points. By modifying the sludge with iron salt, the sludge can be deeply dewatered to a water content of 71%~73%, with a reduction of about 30%, which is a significant effect of sludge reduction. After cost analysis, although the addition of iron salts will increase the cost of pharmaceuticals, it can significantly reduce the cost of sludge transportation, which has great economic benefits in the long run.
Keywords belt press filter modification sludge deep dewatering sludge reduction sludge water content
