污泥低温干化技术及其在饮用水厂的实践  

Low-temperature Drying Technology and Its Practice in Drinking Water Plants

作　　者：颉亚玮 严嘉明 黄允河 刘宏远[1,2] 张刚 沈东春 吴辉 XIE Ya-wei;YAN Jia-ming;HUANG Yun-he;LIU Hong-yuan;ZHANG Gang;SHEN Dong-chun;WU Hui(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Water Engineering and Emergency Technology R&D Center,Zhejiang University of Technology,Hangzhou 310023,China;Hangzhou Water Group Co.Ltd.,Hangzhou 310014,China;Jiaxing Water Investment Group Co.Ltd.,Jiaxing 314000,China)

机构地区：[1]浙江工业大学土木工程学院,浙江杭州310023 [2]浙江工业大学水工程与应急技术研发中心,浙江杭州310023 [3]杭州市水务集团有限公司,浙江杭州310014 [4]嘉兴市水务集团有限公司,浙江嘉兴314000

出　　处：《中国给水排水》2024年第5期9-15,共7页China Water & Wastewater

基　　金：浙工大水工程与应急技术研发中心项目(KYY-HX-20230956)。

摘　　要：针对饮用水厂污泥高含水率问题,对A、B、C三个水厂的热泵低温干化设备运行效果及其结合太阳能工程实例(A水厂)进行了研究,分析了脱水污泥性质等因素对干化效果的影响。结果表明,A、B水厂干化设备的出泥含水率稳定低于55%,除湿能效分别为(3.0±0.2)、(3.2±0.2)kg/(kW·h);C水厂的除湿能效为(3.8±0.2)kg/(kW·h),高于A、B两水厂,但其低温干化后污泥含水率高于60%,除湿能效高的工程意义不大;聚丙烯酰胺类型和投加量会影响污泥胶黏性,间接影响除湿能效;污泥中粉、黏粒含量及天然有机物会增强污泥的胶黏性;C水厂前序机械脱水单元效果差,造成机械脱水后的自由水含量仍高达183.1%,导致污泥低温干化不充分。A水厂在太阳能供热期间,除湿能效高于8 kg/(kW·h),干化费用降低了75.5%。In view of the high water content of drinking water plant sludge,this study investigated the operation effect of heat pump low-temperature drying in A,B and C water plants and its combination with solar energy in A water plant,and analyzed the factors affecting the operation effect of the drying equipment such as the nature of the dewatered sludge.The results showed that the water content of the sludge from the outlet of drying equipment of A and B water plants were stably less than 55%,and its corresponding specific moisture evaporation rate were(3.0±0.2)kg/(kW·h)and(3.2±0.2)kg/(kW·h),respectively.The specific moisture evaporation rate in C water plant was(3.8±0.2)kg/(kW·h),which was higher than that in A and B plants.However,the water content of its low-temperature dried sludge was higher than 60%,and it was not very meaningful to have a high specific moisture evaporation rate.The analysis of sludge properties showed that the choice and dosage of polyacrylamide(PAM)would affect the sludge viscosity,which indirectly affected the specific moisture evaporation rate;dewatered sludge powder,clay particles and adherent natural organic matter would enhance the sludge viscosity,which was not conducive to the improvement of specific moisture evaporation rate.The mechanical dewatering unit in the preliminaries of drying in C water plant exhibited poor effectiveness,resulting in the free water content of sludge after mechanical dewatering remaining as high as 183.1%.This led to inadequate drying of the sludge.During the operation of solar energy merely,the specific moisture evaporation rate of A water plant was higher than 8 kg/(kW·h)and the drying cost could be reduced by 75.5%.

关 键 词：饮用水厂污泥 低温干化 太阳能 热泵 污泥性质 

分 类 号：TU991[建筑科学—市政工程]