CIESC Journal ›› 2015, Vol. 66 ›› Issue (11): 4661-4668.DOI: 10.11949/j.issn.0438-1157.20150544

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Treatment of piggery wastewater with low C/N ratio and mechanism for denitrification in wood-packed-bed A/O process

XIE Rong, ZHAO Bowei, LI Jianzheng, DENG Kaiwen   

  1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China
  • Received:2015-04-30 Revised:2015-05-24 Online:2015-11-05 Published:2015-11-05
  • Supported by:

    supported by the Major Science and Technology Program of Water Pollution Control and Treatment (2013ZX07201007-002-03).

木质填料床A/O系统处理低C/N比养猪废水的效能与脱氮机制

谢荣, 赵博玮, 李建政, 邓凯文   

  1. 哈尔滨工业大学城市水资源与水环境国家重点实验室, 黑龙江 哈尔滨 150090
  • 通讯作者: 李建政
  • 基金资助:

    国家水体污染控制与治理科技重大专项项目(2013ZX07201007-002-03);黑龙江省应用技术研究与开发计划项目(GC13C303)。

Abstract:

Manure-free piggery wastewater is low in COD but high in concentration with a COD-to-TN (C/N) ratio less than 1. In order to removal nitrogen from the wastewater efficaciously, a wood-packed-bed A/O process with four compartments was constructed and its performance in pollutant removal was evaluated, especially the denitrification. The reactor was operated at HRT 18.7 h and 32℃ with an internal recycle ratio of 200% and DO 1.5 mg·L-1 in the last compartment. The treatment process was started up with diluted raw wastewater in which COD/TN ratio was regulated to about 3.9. When the process performed steady, the dilution rate of the raw wastewater was decreased stage by stage, synchronizing with C/N ratio. When the process was steady in the last stage even feeding the raw wastewater with a high of about 307.7 mg·L-1 and a COD/TN ratio as low as 0.47, the removal of COD, and TN was averaged out about 66.5%, 93.6% and 89.0%, respectively. A load removal of TN above 0.22 kg·m-3·d-1 was obtained. The four compartments had illustrated difference in pollutant removal with a total COD removal of about 78.3% in the front three anaerobic compartments and a TN removal of about 73.1% in the last aerobic compartment. TN removal in the reactor was mainly attributed to the shortcut nitrification-denitrification process with the packed wood as the internal carbon source.

Key words: piggery wastewater, low C/N ratio, fixed-bed, anaerobic, aeration, nitrogen removal, carbon source, shortcut nitrification

摘要:

针对干清粪式养猪废水 浓度高和低C/N比的特点构建了四格室木质填料床A/O处理系统,通过调控运行探讨其除氮效能和机制。结果表明,在HRT 18.7 h、32℃、硝化液回流比200%、好氧区DO 1.5 mg·L-1等条件下,即便进水 高达307.7 mg·L-1,COD/TN平均为0.47,系统对COD、 和TN的去除率仍能维持在66.5%、93.6%和89.0%左右,TN去除负荷达到0.22 kg·m-3·d-1以上。系统对COD和TN的去除表现出一定的空间分区特征,其中前三厌氧格室是去除COD主要功能区,末端好氧格室是脱氮功能区。系统的脱氮机制以短程硝化反硝化为主,枯木填料的腐解为反硝化提供了必要的碳源。

关键词: 养猪废水, 低C/N比, 固定床, 厌氧, 曝气, 脱氮, 碳源, 短程硝化

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