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
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
CLC Number:
Jianghu SUN, Nuchi WANG, Xingyan LI, Congyi LI. Application of denitrifying biotechnology in denitrification of concentrated brine[J]. Industrial Water Treatment, 2023, 43(9): 213-218.
孙江虎, 王努驰, 李星焱, 李丛益. 反硝化生物技术在浓盐水脱氮改造中的实践[J]. 工业水处理, 2023, 43(9): 213-218.