中国环境科学
 
 
中国环境科学  2019, Vol. 39 Issue (1): 134-140    DOI:
水污染与控制 最新目录| 下期目录| 过刊浏览| 高级检索 |
低氧条件下A2/O工艺对城市污水脱氮处理的中试研究
李炳荣, 曹特特, 王林, 李咏梅
同济大学环境科学与工程学院, 污染控制与资源化研究国家重点实验室, 上海 200092
A pilot-scale study on nitrogen removal of municipal wastewater by A2/O process under low dissolved oxygen condition
LI Bing-rong, CAO Te-te, WANG Lin, LI Yong-mei
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China

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摘要 

以巢湖市某污水处理厂实际污水为处理对象,基于节能降耗的需求开展A2O工艺中试研究.研究结果表明:当溶解氧从2mg/L降至0.5mg/L时,COD和氨氮的去除率分别为80%和90%,去除性能并未受到影响,没有出现亚硝酸积累,而TN的去除率有较大幅度的提升,从15%提升至44%.低溶解氧条件下,温度降低主要对TN去除率产生影响,从夏季的44%下降至冬季的29%,而氨氮的去除率仍维持在90%以上.由于进水碳源不足,出水主要以硝酸盐氮为主,低温脱氮率仅为29%.长期低氧条件下运行,AOB和NOB的优势种属为NitrosomonadaceaeNitrospira,相对丰度分别为2.33%和6.40%.系统NOB在数量和动力学性能上均优于AOB,同时发现存在Denitratisoma好氧反硝化菌,其相对丰度为1.59%.研究结果为低氧条件下实现城市污水脱氮提供了理论和实践依据.

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李炳荣
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王林
李咏梅
关键词 A2O工艺低溶解氧脱氮处理氨氧化菌亚硝酸盐氧化菌    
Abstract

A pilot-scale A2O process was carried out to treat sewage in a wastewater treatment plant in Chaohu City, aiming to save energy. The results showed that when the dissolved oxygen (DO) decreased from 2mg/L to 0.5mg/L, the removal rates of COD and ammonia were 80% and 90%, respectively, meaning the removal performance was not affected, and no nitrite accumulation occurred, in the meantime, the removal rate of TN increased significantly, from 15% to 44%. Under low DO condition,the decrease of temperature mainly affected the TN removal rate, from 44% in summer to 29% in winter, whereas the removal rate of ammonia was still above 90%. Due to the shortage of carbon source, the nitrogen removal rate was only 29% under low temperature, resulting in a high nitrate concentration in the effluent. Under long-term low DO conditions, the dominant microbial species of AOB and NOB were Nitrosomonadaceae and Nitrospira, with relative abundance of 2.33% and 6.40% respectively. NOB is superior to AOB in both quantity and kinetic performance. At the same time, Denitratisoma was found with the relative abundance of 1.59%, which was considered as aerobic denitrifying bacteria. These findings provide theoretical and practical support for nitrogen removal from municipal wastewater under low DO conditions.

Key wordsA2O process    low dissolved oxygen    nitrogen removal    ammonia oxidizing bacteria    nitrite oxidizing bacteria   
收稿日期: 2018-05-23     
PACS: X703.5  
基金资助:

国家水体污染控制与治理科技重大专项(2014ZX0730300307)

通讯作者: 李咏梅,教授,liyongmei@tongji.edu.cn     E-mail: liyongmei@tongji.edu.cn
作者简介: 李炳荣(1993-),男,广东江门人,硕士研究生,主要从事污水处理及其资源化研究.
引用本文:   
李炳荣, 曹特特, 王林, 李咏梅. 低氧条件下A2/O工艺对城市污水脱氮处理的中试研究[J]. 中国环境科学, 2019, 39(1): 134-140. LI Bing-rong, CAO Te-te, WANG Lin, LI Yong-mei. A pilot-scale study on nitrogen removal of municipal wastewater by A2/O process under low dissolved oxygen condition. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(1): 134-140.
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