基于硫代谢组合工艺的石化废水处理研究

Research on petrochemical wastewater treatment based on sulfur metabolism combined process

根据石化废水的特点,本研究设置了硫代谢组合工艺用于石化废水中NH_(3)-N、TN、COD和Cl^(-)的处理,该工艺由厌氧段、兼性反应器、好氧段3部分组成,厌氧段主要是通过硫酸盐还原菌的作用达到降低污染物浓度的目的,兼性段废水由厌氧段和好氧段废水1∶1组成。结果表明,(1)该工艺连续运行100d后出水水质较好,其中COD和TN的去除率达到90%以上,NH_(3)-N的去除率达到95%以上;(2)该工艺脱氮主要是通过自氧反硝化和异养反硝化过程进行;(3)废水中含盐量过高会抑制微生物群落的代谢活动,可通过延长反应时间达到污染物去除的目的。

According to the characteristics of petrochemical wastewater, this study sets up a combined sulfur metabolism process for the treatment of ammonia nitrogen, total nitrogen, COD and Cl^(-)in petrochemical wastewater.The process consists of an anaerobic section, a facultative reactor, and an aerobic section. The anaerobic section is mainly used to reduce the concentration of pollutants through the action of sulfate reducing bacteria. The facultative section wastewater is composed of anaerobic section and aerobic section wastewater at a ratio of 1∶1. The results showed that,(1)the effluent quality of the process is good after 100 days of continuous operation, in which the re-moval rate of COD and TN is more than 90%, and the removal rate of ammonia nitrogen is more than 95%;(2)The process of nitrification and heterotrophic denitrification is carried out;(3) Excessive salinity in the waste water will simulate the metabolic activity of the microbial community, and the purpose of pollutant removal can be achieved by prolonging the reaction time.