蜂窝状微生物膜降解氨氮  

Biodegradation of ammonium nitrogen by a self-formed honeycomb-like biofilm

作　　者：祁佩时[1] 王文斌[1] 董有 

机构地区：[1]哈尔滨工业大学市政环境工程学院,哈尔滨150090 [2]武汉安全环保研究院,武汉430081

出　　处：《北京科技大学学报》2008年第4期364-367,共4页Journal of University of Science and Technology Beijing

基　　金：国家科技攻关专题基金资助项目(No.2001269)

摘　　要：实验利用新型悬浮载体对氨氮降解进行了研究.在悬浮载体上形成了蜂窝状的微生物薄膜结构,增加了微生物附着的比表面积,薄膜的形成有利于氧气的扩散和基质的转移,为硝化菌提供了有利的生存环境.实验在pH值为7.8～8.2,温度为24～29℃的条件下,当进水的氨氮质量浓度为40～78mg·L-1时,经过3h的反应周期后,氨氮质量浓度下降到2mg·L-1以下,COD从300mg·L-1降低到50mg·L-1以下;在反应周期为4h时,氨氮质量浓度从80～130mg·L-1下降到3.5mg·L-1以下,COD从350mg·L-1降低到46mg·L-1以下.结果表明,该悬浮载体上形成的生物膜结构有利于氨氮降解,反应器内实现了较好的COD和氨氮去除.Ammonium nitrogen （NH4^＋ -N） removal was investigated by using a novel suspended carrier. Honeycomb-like biofilms were formed among the columns on the suspended carrier. The bioreactor was operated at 24 - 29 ℃ and pH values of 7.8 - 8.2. When the influent COD and NH^＋ -N concentrations were below 300 mg·L^-1 and 78 mg·L^-1 respectively, the effluent COD and NH4^＋ -N concentrations after 3 h operation were less than 50 mg· L^- 1 and 2 mg· L^- 1, respectively. After 4 h operation, when the in- fluent COD concentration varied from 150 to 350 mg·L^-1 and the NH4^＋ -N concentration from 80 to 130 mg·L^-1, the corresponding effluent concentrations were below 46 mg·L^-1 and 3.5 mg·L^-1 respectively. The ammonium-nitrogen biodegradation rate in the suspended carrier biofilm reactor is greater than that in the conventional activated sludge system. The honeycomb structure increases the porous ratio, decreases the wall thickness of biofilm and favors mass transfer and oxygen pervasion into the interior of biofilm, which provides better conditions for nitrobacteria growth and improves NH4^＋ -N removal efficiency

关 键 词：生物膜 氨氮 悬浮载体 硝化 

分 类 号：X703.1[环境科学与工程—环境工程]