广东省某水厂污泥处理系统设计

Design of Sludge Treatment System for a Waterworks in Guangdong Province

广东省某新建70×10~4m^3/d给水厂,泥线一期和二期合建,总污泥处理规模为18.44 t DS/d,污泥经过调节、浓缩、脱水处理后外运,泥线包括调节、浓缩、平衡、脱水及回用水等五大系统。排泥池具有一定的预浓缩作用,降低排泥池内污泥含水率,减小湿污泥的体积,降低后续构筑物规模,其投资及日后运行费用均有所减少;浓缩系统采用辐流式重力浓缩池,具有能耗低、运行维护方便等特点,且处理效果稳定,尤其在水库水浊度较高时,能够储存过多的污泥,对系统具有较好的缓冲调节能力;平衡池兼作调质池,减少占地及工程投资,运行管理方便;脱水系统采用离心脱水机,具有投资较低、占地面积小、辅助设备较少、运行管理简单等优势;同时,水厂增设回用水系统,回用水量占厂区总用水量的6%~7%,有效降低了水厂自用水量,节约用水。

A waterworks with treatment capacity of 70 ×10^4m^3/d was constructed in Guangdong Province. The total sludge treatment capacity of the waterworks was 18.44 tDS/d which was the sum of the first and the second phase of the sludge treatment project. The sludge was treated via conditioning, thickening, and dewatering in five treatment stages of conditioning, thickening, equilibration, dewatering and centrifugate recycling. The sludge storage pond has beneficial effects of sludge pre-concentration, wet sludge volume reduction, leading to ensuing reduced construction investment and operation cost. The sludge thickening tank was radial gravity type which had the characteristics of low energy consumption, stable performance, easy operation and maintenance. Especially when the turbidity of the reservoir/raw water was high, the radial gravity tank style was benefit to excess sludge storage and to fluctuation buffer adjustment. Equilibrium pool was used and served as conditioning tank as well, which could reduce the project required area and investment. It could easily be operated and managed. Centrifugal dewatering machine was adopted in the dewatering stage, which has the advantages of low investment, small area requirement, less auxiliary equipment and simple operation and management. Meanwhile, the recycle water system was adopted to the waterworks, the reuse water flow occupied 6% - 7% of the total flow. So the water consumption of the water plant was effectively reduced.