工业水处理 ›› 2023, Vol. 43 ›› Issue (9): 213-218. doi: 10.19965/j.cnki.iwt.2022-0948

• 经验交流 • 上一篇    

反硝化生物技术在浓盐水脱氮改造中的实践

孙江虎(), 王努驰, 李星焱, 李丛益   

  1. 中国石油四川石化有限责任公司公用工程部,四川 成都 611930
  • 收稿日期:2023-07-10 出版日期:2023-09-20 发布日期:2023-09-25
  • 作者简介:

    孙江虎(1981— ),硕士研究生,高级工程师。电话:028-83491085,E-mail:

Application of denitrifying biotechnology in denitrification of concentrated brine

Jianghu SUN(), Nuchi WANG, Xingyan LI, Congyi LI   

  1. Utility Engineering Department,Petrochina Sichuan Petrochemical Company,Chengdu 611930,China
  • Received:2023-07-10 Online:2023-09-20 Published:2023-09-25

摘要:

随着国家和地方环保标准的提高,某石化企业浓盐水处理系统采用“两级臭氧接触池+生物滤池+活性炭滤池”工艺处理后的污水仍不能满足总氮≤15 mg/L的排放标准。因此,在现有处理工艺构筑物的基础上,采用反硝化生物滤池(DNBF)脱氮技术对其进行技术改造,构建出乙酸投加PID控制模型,通过调节DNBF系统C/N、进水TDS、进水温度、控制回流比,使DNBF系统出水硝态氮稳定在8 mg/L左右,经过4 a多的连续运行,外排水质满足国家、地方相关排放标准要求。

关键词: 脱氮, 工艺改造, 浓盐水, 反硝化生物滤池

Abstract:

With the improvement of national and local environmental protection standards,the wastewater treated by the combined process of two-stage ozone contact pool, biological filter and activated carbon filter in the concentrated saline treatment system of a petrochemical enterprise cannot meet the requirements of the discharge standard of total nitrogen ≤15 mg/L. Therefore,on the basis of the existing treatment process structures,the enterprise adopted DNBF denitrification technology to carry out technical transformation,and constructed the PID control model of acetic acid injection. By adjusting the C/N ratio,inlet TDS,inlet temperature,and reflux ratio of DNBF system,the nitrate ammonia at the outlet of DNBF system was stable at about 8 mg/L. After more than four years continuous operation,the effluent water quality met the requirements of the relevant national and local discharge standards.

Key words: removal of nitrogen, process transformation, concentrated brine, denitrifying biological filter

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