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。
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.
作者
孙江虎
王努驰
李星焱
李丛益
SUN Jianghu;WANG Nuchi;LI Xingyan;LI Congyi(Utility Engineering Department,Petrochina Sichuan Petrochemical Company,Chengdu 611930,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2023年第9期213-218,共6页
Industrial Water Treatment
关键词
脱氮
工艺改造
浓盐水
反硝化生物滤池
removal of nitrogen
process transformation
concentrated brine
denitrifying biological filter
