摘要
针对某化学制药企业的生产废水总氮(TN)、氨氮(NH3-N)浓度高,含有大量难生物降解的有机物,水质pH变化大等特点,采用两级氨氮吹脱+综合调节+水解酸化+两级A/O+混凝沉淀处理的组合工艺对其进行处理。分析并研究了氨氮吹脱的最优工艺参数,调节pH至11.5,控制气液体积比为3 500∶1,吹脱率可以达到90%以上。结果表明,氨氮吹脱处理单元NH3-N及TN去除率均达到94%,经过两级A/O和二沉池处理,化学需氧量(CODCr)、NH3-N及TN去除率分别达到91.1%、96.3%及91.0%。组合工艺处理后的出水CODCr≤50 mg/L,NH3-N浓度≤8 mg/L,TN浓度≤15 mg/L,SS浓度≤10 mg/L,水质达到GB 18918-2002《城镇污水处理厂污染物排放标准》的一级A标准,工艺处理成本为2.429元/m3。
In view of the high concentrations of total nitrogen and ammonia nitrogen in the production wastewater of a chemical pharmaceutical enterprise,which contained a large number of organic compounds that were difficult to biodegrade,with a large change in acidity and alkalinity of the water quality,a combined process of two-stage ammonia nitrogen blow-off+comprehensive regulation+hydrolysis and acidification+two-stage A O+coagulation and precipitation was adopted to treat the wastewater.The optimal process parameters of ammonia nitrogen blow-off were analyzed and studied.When the pH was adjusted to 11.5,and the gas-liquid volume ratio was controlled to 3500∶1,the blow-off rate could reach more than 90%.The operation results showed that the removal rates of NH 3-N and TN in the ammonia nitrogen blow-off treatment unit both reached 94%.After two-stage A O and secondary sedimentation tank treatment,the removal rates of COD Cr,NH 3-N and TN reached 91.1%,96.3%and 91.0%,respectively.After the combined process,the effluent pollutant concentrations were COD Cr≤50 mg L,NH 3-N≤8 mg L,TN≤15 mg L,SS≤10 mg L,and the quality of the treated water reached GradeⅠlevel A standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants(GB 18918-2002),and the processing cost was 2.429 yuan m 3.
作者
李文杰
LI Wenjie(Gansu Academy of Eco-environmental Sciences)
出处
《环境工程技术学报》
CAS
2020年第4期606-612,共7页
Journal of Environmental Engineering Technology
关键词
化学制药废水
两级氨氮吹脱
水解酸化
两级A/O
混凝沉淀
chemical pharmaceutical wastewater
two-stage ammonia nitrogen blow-off
hydrolysis and acidification
two-stage A O
coagulation precipitation
