关键词: 石化废水, 深度处理, 共代谢, 序批式活性污泥工艺

Abstract: 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.

Key words: petrochemical wastewater, advanced treatment, co-metabolism, sequencing batch reactor (SBR)