微污染水源水脱氮的强化混凝工艺  

Enhanced coagulation process for denitrification from micro-polluted water source

作　　者：卢芳 李孟[1] 江以恒 张倩 LU Fang;LI Meng;JIANG Yiheng;ZHANG Qian(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Zhejiang Municipal Design Institute Co.Ltd.,Shanghai Municipal Engineering Design and Research Institute(Group),Hangzhou 310006,China)

机构地区：[1]武汉理工大学土木建筑与工程学院,武汉430070 [2]上海市政工程设计研究总院(集团)浙江市政设计院有限公司,杭州310006

出　　处：《环境工程学报》2020年第1期113-122,共10页Chinese Journal of Environmental Engineering

基　　金：中央高校基本科研业务费专项资金资助项目(2019Ⅲ105CG)

摘　　要：通过对机械搅拌桨桨板结构优化改造,实现在絮凝池内同步进行强化混凝及生物脱氮反应,分析桨板长度梯度、板间间距及其与固定挡板间夹角对絮凝池内溶解氧浓度梯度产生影响,设计出了一种搅拌时池内可以形成厌氧-缺氧-好氧环境的新型机械搅拌桨,Fluent流场分析进一步验证了池内横向、纵向都会产生溶解氧浓度梯度。新型搅拌桨与传统搅拌桨生物脱氮对比实验表明,当采用新型搅拌桨时,絮凝池对NH4^+-N、TN去除效果远优于传统搅拌桨。进一步进行模拟微污染水源水的强化混凝生物脱氮应用实验,出水浊度为0.47 NTU,COD、NH4^+-N和TN的浓度分别为10.54、5.01和5.84 mg·L^-1,表现出良好的处理效果。对污泥粒径的研究表明,PAC投加可有效改善污泥絮体结构,为微污染水源水的处理提供了新思路。In this study,the synchronous enhanced coagulation and biological denitrification reactions in the flocculation tank were realized by modifying the structure of the stirring paddle.The effects of the paddle length gradient,the spacing between the paddles,and the angle between the paddles and the transverse brackets on the dissolved oxygen concentration gradient in the tank were determined,finally a new mechanical stirring paddle was designed,an anaerobic-anoxic-aerobic reaction environment occurred in the tank when the stirring paddle rotates.Through Fluent analysis of flow field in flocculation tank,the dissolved oxygen concentration gradient along the longitudinal and transverse directions in the flocculation tank was further verified.Biological denitrification experiments were carried out using new mixing paddles and conventional paddles,respectively.NH4^+-N and TN removal effects were far superior to the traditional mixing paddle in the flocculation tank.The synchronous enhanced coagulation and biological denitrification experiments were further conducted to treat the simulated micro-polluted water sources,the turbidity of the NH4^+-N and TN were 10.54,5.01 and 5.84 mg·L^-1,respectively,which showed good performance on micro-polluted water sources treatment.The results of sludge particle size measurement proved that PAC dosing could effectively improve sludge floc structure,which provides a new development direction for the treatment of micro-polluted source water.

关 键 词：桨板结构优化 Fluent流场分析 强化混凝 生物脱氮 

分 类 号：X522[环境科学与工程—环境工程]