无回流生物滤床净化槽脱氮效果的研究

水是人类生存必不可少的一种生活资源,是保证

社会和谐稳定与生产发展的重要因素[1]。2010年第一

次全国污染源普查结果显示[2],农业源污染物化学需

氧量(COD )、总氮(TN )的排放量分别占总排放量的43.7%、57.2%。农村污水具有排放源分散、污水产生量小、水质水量波动大等特点,因此,在处理农村污水时需因地制宜,选择投资费用少、运行管理简单的分散式处理工艺[3-5]。小型污水净化槽是一种非常适合农

摘要:构建一种脱氮的无回流生物滤床家庭生活污水处理一体化净化槽,

研究其处理效果;改变各区内的曝气形式,形成A/O/A/O 的脱氮工艺,通过测定各区COD 、NH +4-N 、NO -3-N 和TN 的浓度变化,考察其处理效果。结果表明:

随着净化槽各区生物滤床的加入,反应器抗冲击性增强,处理效果明显提高。但A/O/A/O 系统中第二级厌氧过程因碳源不足,脱氮效果不佳,改用分段进水后,净化槽不仅运行稳定,而且取得了很好的处理效果,出水COD 平均浓度12.3mg ·L -1,NH +4-N 平均浓度2.7mg ·

L -1,TN 平均浓度13.0mg ·L -1,均达到国标(GB 18918—2002)一级A 标准。A/O/A/O 生物滤床新型净化槽不仅在结构上形成一体化,而且由于生物滤床的使用,不需要污泥回流,节省能耗,通过分段进水可以实现过程脱氮。

关键词:生活污水;净化槽;生物滤床;A/O/A/O 工艺;分段进水;脱氮

中图分类号:X52文献标志码:A 文章编号:1672-2043(2018)02-0316-07doi:10.11654/jaes.2017-1021Study on nitrogen removal effect of non-circumfluence bio-filter purifying tank

WANG Chang,HU Jie,WANG Yao-chen,MA Yue-fan,ZENG Ming,LI Li (College of Marine and Environmental Sciences,Tianjin University of Science &Technology,Tianjin 300457,China )

Abstract :A non-circumfluence multi-functional integrated bio-filter purifying tank was developed to study the removal performance of ni -trogen and chemical oxygen demand (COD )in rural domestic sewage.The influence of support media on pollutant biodegradation was in -vestigated by adding support media in each zone in a stepwise manner.Subsequently,the aeration condition was changed to anaerobic/oxide/anoxic/oxide (A/O/A/O )mode and variations of COD,NH +4-N,NO -3-N,and total nitrogen (TN )concentrations in each zone were detected.Stable effluent quality and good resistance to shock-loading were achieved in the purifying tank when the support media were employed.In the A/O/A/O system,the denitrification efficiency was unsatisfactory because of the lack of carbon source in the second anoxic stage.How -ever,when the step-feed strategy was adopted,the treating performance of the purifying tank became stable and afforded highly efficient ni -

trogen removal.Specifically,the average effluent concentration of COD,NH +4-N,and TN reached 12.3,2.7mg ·L -1and 13.0mg ·L -1,re -spectively,which satisfies the national primary A of discharge standard (GB 18918—2002).Overall,the purifying tank with the A/O/A/O operation mode not only performed as a compact reactor to remove nitrogen by step-feed,but also avoided the recirculation of sludge by employing the bio-filter and saved energy costs.Keywords :domestic sewage;purifying tank;bio-filter;A/O/A/O process;step-feed;nitrogen removal 收稿日期:2017-07-22录用日期:

2017-10-16作者简介:王昶(1958—),男,江苏人,教授,从事水处理技术研究。E-mail :

wangc88@http://www.360docs.net/doc/info-e35b2933df80d4d8d15abe23482fb4daa58d1d6d.html 基金项目:天津市科委重大专项([2014]14ZCDGNC00097);天津市农委重大专项合作项目(201404140)Project supported :The Science and Technology Commission of Tianjin ,China ([2014]14ZCDGNC00097);

The Agricultural Commission of Tianjin ,China (201404140)

无回流生物滤床净化槽脱氮效果的研究

王昶,胡洁,王耀琛,等.无回流生物滤床净化槽脱氮效果的研究[J].农业环境科学学报,2018,37(2):

316-322.WANG Chang,HU Jie,WANG Yao-chen,et al.Study on nitrogen removal effect of non-circumfluence bio-filter purifying tank[J].Journal of Agro -Environ-ment Science ,2018,37(2)

:316-322.无回流生物滤床净化槽脱氮效果的研究

王昶,胡洁,王耀琛,马越凡,曾明,李丽

(天津科技大学海洋与环境学院,天津300457)

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