双区沉淀池用于连续流好氧颗粒污泥工艺的可行性  

Feasibility of Aerobic Granular Sludge Formation in Continuous Flow Reactor Based on Two-zone Sedimentation Tank

作　　者：吴越 赵传峰 孙法文 刘文龙 李军 WU Yue;ZHAO Chuan-feng;SUN Fa-wen;LIU Wen-long;LI Jun(Zhejiang Key Laboratory of Microbial Technology for Industrial Pollution Control,College of Environment,Zhejiang University of Technology,Hangzhou 310014,China;Quzhou Qingtai Environmental Engineering Co.Ltd.,Quzhou 324000,China)

机构地区：[1]浙江工业大学环境学院浙江省工业污染微生物控制技术重点实验室,浙江杭州310014 [2]衢州市清泰环境工程有限公司,浙江衢州324000

出　　处：《中国给水排水》2020年第19期9-15,共7页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51478433);浙江省重点研发计划项目(2018C03006)。

摘　　要：选取一座已初步形成好氧颗粒污泥的工业污水处理厂的辐流式沉淀池为研究对象,结合实际运行情况建立固液二相流模型,分析沉淀池内活性污泥的沉降性能和分布规律。从沉淀池底径向距离中心1、6和12 m处取得3个污泥样本S1、S2和S3,其中S1的平均粒径(294.6μm)远高于S2(142.8μm)和S3(55.2μm),对应的污泥指数(SVI)分别为56.2、63.4和81.3 mL/g。综合试验结果和计算流体力学(CFD)模拟结果可以发现,沉淀池内颗粒污泥主要集中在半径为1~6 m的圆环区域内。因此,可以通过选择性回流中心区域内的颗粒污泥来制造选择压,从而实现连续流工艺的污泥颗粒化。A radial sedimentation tank from a full-scale industrial sewage treatment plant which has formed the primary aerobic granular sludge(AGS),was used to investigate the settling performance and distribution of the activated sludge in a solid-liquid two-phase flow system using computational fluid dynamics(CFD)model.Three sludge samples(S1,S2 and S3)were taken from the bottom of the sedimentation tank at the different radial distances(1 m,6 m and 12 m,respectively)from the center of the tank.The average particle size of S1 sludge(294.6μm)was higher than that of S2 sludge(142.8μm)and S3 sludge(55.2μm),while the corresponding sludge volume index for three sludge samples were 56.2 mL/g,63.4 mL/g and 81.3 mL/g,respectively.Both CFD simulation and experimental data showed that the ring area with a radius of 1-6 m in sedimentation tank contributed to the retention of heavier and larger granular sludge.Therefore,the selection pressure could be generated by selective recirculation of the granular sludge in the center area of the sedimentation tank to enhance the aerobic granulation in the continuous flow reactor.

关 键 词：好氧颗粒污泥 连续流 双区沉淀池 辐流式沉淀池 选择压 

分 类 号：TU992[建筑科学—市政工程]