SBR共代谢工艺深度处理石化废水

以实现石化废水深度处理为目的，考察采用序批式活性污泥工艺（sequencing batch reactor，SBR）生物共代谢深度处理石化废水效果的营养及工艺运行条件。结果表明：最佳共代谢基质为淀粉，当其投加量为30 mg/L、摇床转速为120 r/min、温度为25 ℃、MLSS为2320 mg/L时，经12 h处理后的二级出水COD下降了79.58%，臭、氨氮、BOD5等指标也有所改善。SBR的最佳工艺条件为运行周期6 h、曝气强度30 L/h、淀粉投加量30 mg/L、缺氧/好氧运行时间比例1/2。此外，生活污水可替代淀粉作为共代谢基质，剩余污泥的持续添加不会影响污染物的降解效果。因此，SBR生物共代谢工艺可实现石化废水的深度处理、生活污水的同步处理及剩余污泥的减量。

SBR co-metabolism process for the advanced treatment of petrochemical wastewater

The nutritional and operational conditions of a SBR co-metabolism process were investigated in order to realize the advanced treatment of the secondary effluent of a petrochemical wastewater treatment plant. The results showed that the best co-metabolism substrate was starch. After co-metabolic degradation of 12 h，COD concentration of the secondary effluent was reduced by 79.58% and odor，ammonia nitrogen，BOD5 and other water quality indicators were also improved under the following conditions：dosage，30 mg/L；shaking speed，120 r/min；temperature，25 ℃；MLSS，2320 mg/L. The optimum operating conditions for the SBR co-metabolic process were determined to be operation period of 6 h，aeration intensity of 30 L/h，starch dosage of 30 mg/L，anoxic/aerobic time ratio of 1/2. Domestic sewage could replace starch as co-metabolism substrate. The constant addition of excess sludge didn’t affect the degradation of the pollutants and the excess sludge amount was reduced. Therefore，SBR co-metabolism process could be feasible for the advanced treatment of petrochemical wastewater，domestic wastewater treatment and excess sludge reduction.