不同运行方式下低溶解氧污泥微膨胀的可行性研究  

Feasibility Study for Limited Filamentous Bulking Under Low Dissolved Oxygen at Different Operation Regimes

作　　者：王中玮[1] 彭永臻[1] 王淑莹[1] 郭建华[2] 黄慧珺[1] 郑雅楠[1] 

机构地区：[1]北京工业大学北京市水质科学与水环境恢复工程重点实验室,北京100124 [2]哈尔滨工业大学城市水资源与水环境国家重点实验室,哈尔滨150090

出　　处：《环境科学》2011年第8期2347-2352,共6页Environmental Science

基　　金：高等学校博士学科点专项科研基金项目(20091103110011);城市水资源与水环境国家重点实验室开放基金项目(QAK201006)

摘　　要：污泥微膨胀是一种利用低溶解氧(DO)引发丝状菌繁殖来实现污水节能处理的新方法.为分析该方法的可行性,采用4个间歇式反应器(SBR)模拟不同的工艺,考察了低DO下(DO=0.5 mg/L)各反应器的污泥沉降性、絮体结构、污染物去除特性及曝气能耗.结果表明,全程好氧运行方式易引发恶性膨胀;而前置缺氧运行方式下进水时间在60～90 min时可实现稳定的微膨胀状态,并具有较好的节能效果.在同样的低DO下,微膨胀污泥絮体松散、细小,氨氮降解速率约为正常污泥的2倍,但总氮去除率较低.进一步分析可知,创造一个良好的缺氧/厌氧/好氧交替的环境并避免负荷过高可有望实现低氧微膨胀的稳定维持.Limited filamentous bulking under low dissolved oxygen（DO） is a new technology for energy saving and high quality effluent.In order to investigate the feasibility of this technology,four sequence batch reactors（SBRs） were occupied to operate at different regimes to stimulate different processes under low DO（0.5 mg/L）.Sludge settleability,floc structure,pollutant removal and aerated energy consumption were investigated.The results showed that limited filamentous bulking under low DO was hard to realize in the single-stage aerobic reactors for they were prone to bulking severely,while it could be achieved stably in the pre-denitrification reactors when the feed length was between 60 and 90 minutes.Compared with normal sludge at the same DO,limited filamentous bulking sludge acquired by low DO displayed its high energy-saving effect.In addition,the specific ammonia consumption rate of limited filamentous bulking sludge was about 2 times higher than the one of normal sludge.On the contrary,the total nitrogen removal efficiency was lower.Further analysis indicated that stable limited sludge bulking could be achieved in a good alternative anoxic/anaerobic/aerobic condition without too high organic loading.

关 键 词：低溶解氧 污泥微膨胀 可行性 运行方式 节能 

分 类 号：X703.1[环境科学与工程—环境工程]