炼油高浓度污水达标排放处理

针对炼油高浓度污水硫、酚含量高及生化性差的特点，开发了由生物脱硫、Fe-C微电解、生物除酚、吸附-生物降解法(AB法)和内循环曝气生物滤池(BAF)等单元组合的处理技术. 研究结果表明，控制生物脱硫、生物除酚、AB法和内循环BAF等生化反应器的溶解氧分别为2.0, 2.0~2.4及AB法的A段为0.6~1.0，B段为1.5~2.0和大于2.4 mg/L，水力停留时间分别为8~12, 8~12, 5~6和2.5~3.0 h，Fe-C微电解的Fe/C质量比为3~4, pH值3.0~3.8, 反应时间30 min，则该污水的硫化物、挥发酚、COD、氨氮和石油类的平均浓度分别由705, 225, 4333, 38.6和30.0 mg/L降至0.3, 0.07, 80.5, 11.6和2.9 mg/L，达到排放标准.

Treatment of High-concentration Wastewater from Oil Refinery for Meeting Discharge Standard

Aiming at the characteristics of high content of sulfur and phenolic pollutants and poor biochemical properties of high-concentration wastewater from oil refinery, a combined technology of biological desulfurization, Fe-C micro-electrolysis, biological phenol removal, adsorption-biodegradation process (AB method) and internal recycle biological aerated filter (BAF) was developed. The results showed that dissolved oxygen of the bio-reactors of biological desulfurization, biological removal of phenol, AB method and internal recycle BAF were controlled at 2.0 mg/L, 2.0~2.4 mg/L, 0.6~1.0 mg/L in section A, 1.5~2.0 mg/L and ≥2.4 mg/L in section B by AB method respectively, hydraulic retention time (HRT) in 8~12, 8~12, 5~6 and 2.5~3.0 h respectively, Fe/C mass ratio of the Fe-C micro-electrolysis at 3~4, pH value in 3.0~3.8, and reaction time for 30 min, the average mass concentrations of sulfide, volatile phenol, COD, ammonia nitrogen and oil in the wastewater were reduced from 705, 225, 4333, 38.6 and 30.0 mg/L to 0.3, 0.07, 80.5, 11.6 and 2.9 mg/L respectively, thus meeting the national discharge standards.