假连续流O/A工艺处理污泥水和富集硝化菌  

Study on Reject Water Treatment and Nitrifier Enrichment by Pseudo-continuous O/A Process

作　　者：万琼[1,2] 彭党聪[1] 贺亮[3] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]西安科技大学建筑与土木工程学院,陕西西安710054 [3]机械工业勘察设计研究院,陕西西安710043

出　　处：《中国给水排水》2012年第13期29-33,共5页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2009ZX07317-009);西安科技大学培育基金资助项目

摘　　要：城市污水处理厂的污泥水具有氨氮浓度高和碳氮比值低的特点。通常将污泥水回流至进水口,这导致污水处理系统的氨氮负荷增高,出水氨氮和总氮浓度不达标。利用污泥水培养和富集硝化菌,并添加到污水处理系统,可以达到既处理污泥水又增强污水处理系统硝化能力的双重目的。采用O/A工艺对实际污水厂的污泥水进行处理,探讨硝化效果和硝化菌产率。当水力停留时间为32 h、污泥龄为15 d时,污泥水中的氨氮能够完全被硝化,最大氨氧化速率和最大亚硝酸盐氧化速率分别可以达到12.43 mgNH4+-N/(gMLSS.h)和13.18 mgNO2--N/(gMLSS.h),硝化菌产率为0.088 mg/mgN,即当污泥水中的氨氮浓度为400 mg/L时,1 L污泥水可富集35.2 mg硝化菌。FISH检测表明,系统中的氨氧化菌主要为Nitrosospira,亚硝酸盐氧化菌主要为Nitrobacter和Nitrospira。Reject water from sludge treatment in municipal wastewater treatment plant （WWTP） is characterized by high ammonia nitrogen concentration and low C/N ratio. Reject water is sent back to the WWTP influent, which may overload the plant, causing over-standard ammonia nitrogen and total nitrogen in the effluent. Adding nitrifiers cultivated and enriched in reject water into the wastewater treatment system can improve reject water treatment and nitrification capability. A pseudo-continuous O/A process was used to treat the reject water from a WWTP, and the nitrification efficiency and the nitrifier yield were investigated. When HRT and water could be completely nitrified. SRT were 32 h and 15 d, respectively The maximum ammonia utilization rate ammonia nitrogen in reJect AUR） and nitrite utilization rate （NUR） could reach as high as 12.43 mgNH4 -N/（gMLSS · h） and 13.18 mgNO2- -N/（gMLSS·h）, respectively. The nitrifier yield was 0. 088 mg/mgN. Specifically, 35.2 mg of nitrifiers could be enriched by 1 L of reject water when the ammonia nitrogen concentration in reject water was 400 mg/L. FISH test showed that the main species of ammonia oxidizing bacteria （AOB） was Nitrosospira and the main species of nitrite oxidizing bacteria （NOB） were Nitrobacter and Nitrospira.

关 键 词：污泥水 假连续流O/A工艺 硝化菌 氨氧化速率 亚硝酸盐氧化速率 

分 类 号：X703[环境科学与工程—环境工程]