Abstract: The process of powdered activated carbon treatment (PACT) + wet air regeneration (WAR) was used to treat the oily and salty waste water in a refinery with scales of 500 m3/h. Based on the analysis and optimization of the existing problems in the operation of the unit, the operation monitoring results indicated that the process had strong nitrogen and carbon removal ability and could withstand load impact. The average effluent COD and ammonia nitrogen concentration of the oily waste water were 36.8 mg/L and 0.3 mg/L,respectively, and the average removal rates were 87.8% and 97.2%,respectively; the average effluent COD and ammonia nitrogen concentration of the salty waste water were 48.4 mg/L and 0.4 mg/L,respectively, and the average removal rates were 89.9% and 98%,respectively, which could meet the requirements of the effluent quality index. The direct operating cost of the process was 3.07 yuan/m³，the discharge of waste gas could meet the standard, and the discharge of biochemical surplus sludge was nearly zero, so the process had a good demonstration effect.

Key words: powdered activated carbon treatment, wet air regeneration, petrochemical waste water, denitrification, carbon removal