关键词: 深度处理工艺, 炼油污水, COD, 氨氮, 总氮, 悬浮物

Abstract: The concentrated water of reclaimed water after reused and reverse osmosis (RO) concentrated water in refinery wastewater treatment plant have high inorganic salt content, high hardness and poor biodegradability. The concentrated water of reclaimed water after reused and RO concentrated water are mixed with the effluent from the wastewater treatment plant. The process flow of “regulating tank + high-density sedimentation tank + ozone catalytic oxidation tank + improved multi-stage biological aerated filter + micro sand and carbon high-efficiency sedimentation tank” is adopted. The treated effluent can meet the standard A in DB 61/224—2018 “Integrated wastewater discharge standard of Yellow river basin in Shaanxi province”. The COD of effluent is below 30 mg/L, and removal rate is higher than 62.5%; ammonia nitrogen is below 0.8 mg/L, and removal rate is higher than 94.7%; total nitrogen is below 15 mg/L, and removal rate is higher than 50.0%; suspended solid is below 10 mg/L, and removal rate is about 85.7%; petroleum is below 1.0 mg/L, and removal rate is higher than 80.0%; total phosphorus is not detected. The effect of advanced treatment is good, and it is worth popularizing.

Key words: advanced treatment process, refinery wastewater, COD, ammonia nitrogen, total nitrogen, suspended solid