Improved Performance of Membrane Bioreactor by Sludge Ozonation for Reduction of Excess Sludge Production  

作　　者：蒋轶锋 何圣兵 陈建孟 

机构地区：[1]College of Biological and Environmental Engineering,Zhejiang University of Technology [2]School of Environmental Science and Engineering,Shanghai Jiaotong University

出　　处：《Journal of Donghua University(English Edition)》2009年第2期171-176,共6页东华大学学报（英文版）

基　　金：Science and Technology Development Projects of Zhejiang Province and Hangzhou City,China(No.2007C13081,No.20062912A06);Key Decipline Open Foundation of Zhejiang University of Technology,China(No.20080210)

摘　　要：To seek for an alternative solution for the treatment and disposal of excess activated sludge,a hybrid system of membrane bioreactor(MBR)coupled with ozonation process(i.e.,ozonation run)was set up to treat the domestic wastewater.A reference run without ozonation was also preformed as a control.The optimal ozone dose of 0.16mg O3·mg MLVSS-1 used for the sludge solubilization in the ozonation run was firstly determined through the batch sludge ozonation tests.A 40-day continuous operation of the two parallel systems demonstrated that circulation of ozonized sludge as lysate did not impact the performance of MBR in terms of organic and ammonia removal.On the contrary,an improvement in TN removal(by 7.7%)and sludge reduction(by 54%)was observed in the ozonation-combined MBR,and it was furthermore illustrated by the calculation of the mass balance based on the COD and TN substances.In addition,ozonation did not deteriorate the sludge activities for the ozonation run,indicating that not much inert organic materials built up in the bioreactor.Decreased VSS/SS ratio and lower amount of filamentous bacteria after ozonation treatment on the other hand improved the sludge settleability,as lower and constant Sluge Volume Index(SVI)values were detected in the ozonation run.To seek for an alternative solution for the treatment and disposal of excess activated sludge,a hybrid system of membrane bioreactor（MBR）coupled with ozonation process（i.e.,ozonation run）was set up to treat the domestic wastewater.A reference run without ozonation was also preformed as a control.The optimal ozone dose of 0.16mg O3·mg MLVSS^-1 used for the sludge solubilization in the ozonation run was firstly determined through the batch sludge ozonation tests.A 40-day continuous operation of the two parallel systems demonstrated that circulation of ozonized sludge as lysate did not impact the performance of MBR in terms of organic and ammonia removal.On the contrary,an improvement in TN removal（by 7.7%）and sludge reduction（by 54%）was observed in the ozonation-combined MBR,and it was furthermore illustrated by the calculation of the mass balance based on the COD and TN substances.In addition,ozonation did not deteriorate the sludge activities for the ozonation run,indicating that not much inert organic materials built up in the bioreactor.Decreased VSS/SS ratio and lower amount of filamentous bacteria after ozonation treatment on the other hand improved the sludge settleability,as lower and constant Sluge Volume Index（SVI）values were detected in the ozonation run.

关 键 词：membrane bioreuctor （ MBR ） OZONATION NITROGEN excess sludge 

分 类 号：X703[环境科学与工程—环境工程] TU991.2[建筑科学—市政工程]