难生物降解炼油污水的“催化氧化+曝气生物滤池”处理技术研究

为解决炼油企业高浓度污水经"隔油+气浮+生化"的传统工艺处理时外排水难以稳定达标的问题,针对该类污水难生物降解的特点,采用"催化氧化+曝气生物滤池"组合处理工艺进行了中试研究。结果表明,利用·OH强氧化反应处理的污水经曝气生物滤池生化处理后,出水中COD、氨氮浓度、油浓度、悬浮物浓度的平均值分别为51.2,5.3,2.3,27 mg/L,COD降低率为83.1%,氨氮、油和悬浮物的平均去除率分别为80.1%,73.4%,61.6%,主要水质指标均达到国家一级排放标准。该技术不需改建炼油厂现有污水处理系统,可实现工业化应用。

STUDY ON NON-BIODEGRADABLE REFINERY EFFLUENT TREATMENT BY COMBINED PROCESS OF CATALYTIC OXIDATION AND BIOLOGICAL AERATED FILTER

Unbiodegradable organic fraction in refinery wastewater is unable to be treated by oil separator-air floatation-biological combined process to meet the discharge standard. The catalytic oxidation-BAF combined process was utilized to treat this kind of non-biodegradable wastewater in a pilot plant. The results showed that after the waste water treated by catalytic oxidation followed by BAF treatment, the COD, NH3-N, oil and suspended solids (SS) in the effluent were 51.2 mg/L, 5.3 mg/L,2.3 mg/L and 27 mg/L, respectively, the removal rate of COD(Ave.) NH3-N(Ave.), oil(Ave.), SS(Ave.) reached to 83.1%, 80.1%, 73.4% and 61.6%, respectively. The quality of effluent meets the discharge requirement of first grade national standard. It is concluded that this combined process can be used in the existing industrial device without a need for revamping the wastewater treatment system.