淀粉酶促进剩余污泥热水解的研究.PDFVIP

中国环境科学 2011,31(3) ：396~401 China Environmental Science 淀粉酶促进剩余污泥热水解的研究 1 1,2* 1 1 1 陈小粉 ,李小明 ,杨 麒 ,罗 琨 ,谢冰心 (1.湖南大学环境科学与工程学院,环境生物与控制教育部重点 实验室,湖南 长沙 410082 ；2.广西大学环境学院,广 南宁 530004) 摘要：考察了微好氧条件下,外加淀粉酶对污水处理剩余污泥热水解的影响, 以及水解过程中污泥上清液各成分的变化情况,并对酶水解过 程的动力学进行了分析.结果表明,淀粉酶的加入对剩余污泥的热水解有促进作用.在最适温度 50℃,酶投加量 0.5g/L 条件下,水解 4h 后,污泥 中 SCOD/TCOD 达到 30.98%, 比未加酶时高7.68%.在淀粉酶催化作用和热水解的共同作用下,污泥固体溶解,大分子碳水化合物被水解成小 分子糖类,固相蛋白质溶出,并进一步水解.污泥水解过程中,上清液糖、蛋白质浓度均呈现先增加后降低趋势.加酶后污泥上清液中糖、蛋白 质浓度分别于 4h 、6h 达到最大值 271.43mg/L 和 1437.37mg/L.污泥水解反应前 4h 内,VSS 溶解率和 SCOD/TCOD 增加迅速,符合一级反应 动力学,4h 后反应趋于平衡.4h 时 VSS 溶解率达到 22.01%. 关键词：剩余污泥；淀粉酶；热水解；微好氧；一级反应 中图分类号：X703 文献标识码：A 文章编号：1000-6923(2011)03-0396-06 1 1,2* 1 Promoting thermal hydrolysis of excess sludge with external amylase. CHEN Xiao-fen , LI Xiao-ming , YANG Qi , 1 1 LUO Kun , XIE Bing-xin (1.Key Laboratory of Environmental Biology and Pollution Control, College of Environmental Science and Engineering, Hunan University, Changsha 410082, China；2.College of Environment, Guangxi University, Nanning 530004, China). China Environmental Science, 2011,31(3)：396~401 Abstract ：The effects of α-amylase on excess sludge thermal hydrolysis under aerobic conditions were investigated. It was found that sludge hydrolysis efficiency could be enhanced by amylase. When treated at the dosage of 0.5g/L of amylase, SCOD/TCOD in sludge could reach 30.98% under the optimal temperature 50℃, which was 7.68% higher than the control experiment. As a result of the interaction of amylase and thermal hydrolysis, sludge solids dissolved first and subsequently macromolecular carbohydrate was hydrolyzed into small-molecular sugar, and