溶菌酶预处理对剩余污泥脱水性能的影响  

Effect of Lysozyme Pretreatment on Dewatering Performance of Excess Activated Sludge

作　　者：罗璐[1,2] 施周 许仕荣[1,2] 周石庆[1,2] 李广超 周先敏[1,2] LUO Lu;SHI Zhou;XU Shi-rong;ZHOU Shi-qing;LI Guang-chao;ZHOU Xian-min(College of Civil Engineering,Hunan University,Changsha 410082,China;Key Laboratory of Building Safety and Energy Efficiency,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]湖南大学建筑安全与节能教育部重点实验室,湖南长沙410082

出　　处：《中国给水排水》2022年第3期87-91,共5页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51878257、51508174);湖南省自然科学基金资助项目(2018JJ3059)。

摘　　要：将溶菌酶应用于剩余污泥的预处理,考察了不同酶投加量对污泥脱水性能的影响,通过测定滤饼含水率、污泥比阻、污泥毛细吸水时间(CST)、Zeta电位及污泥上清液中的蛋白质和多糖含量,并采用显微镜和扫描电镜观测污泥絮体和颗粒结构的变化,同时结合三维荧光光谱分析,研究原污泥和酶处理后污泥的脱水性能差异。结果表明,适宜的溶菌酶投加量可显著改善剩余污泥的脱水性能,与原污泥相比,当酶投加量为15%时,真空抽滤后的含水率由91.4%降到63.6%,比阻降低了82%,CST降低了65%,Zeta电位从-14.8 mV上升到2.7 mV。溶菌酶对污泥结构的破坏是其改善污泥脱水性能的重要原因。The lysozyme was used in the pretreatment of activated sludge, and the effect of lysozyme dosage on sludge dewatering performance was investigated. The moisture content of vacuum filtration sludge cake, sludge filtration resistance, sludge capillary sunction time(CST), Zeta potential and the protein & polysaccharides contents in sludge supernatant were analyzed. Moreover, the change of sludge flocs and granular structure were measured by normal microscope and scanning electron microscope. Based on the three-dimensional fluorescence spectrum, the sludge dewatering performance before and after lysozyme pretreatment was evaluated. The results showed that the appropriate lysozyme dosage could enhance the sludge dewatering performance. When the lysozyme dosage was 15%, the moisture content of vacuum filtration sludge cake decreased from 91.4% to 63.6%, the sludge filtration resistance decreased by 82%, CST decreased by 65%, and the Zeta potential increased from-14.8 mV to2.7 mV. The results showed that the destruction of sludge structure by lysozyme was an important reason for improving sludge dewatering performance.

关 键 词：剩余污泥 溶菌酶 脱水性能 污泥结构 

分 类 号：TU992[建筑科学—市政工程]