Abstract: In order to improve the stripping efficiency of sour water stripping unit at SINOPEC Jinling Company, measures, such as refining according to storage, injecting more alkali and prolonging the sedimentation time of sour water, were adopted to optimize the process for treating sour water, enhance the stripping efficiency and improve the quality of water entering sewage disposal plant. After process optimization, the concentration reductions of CODcr and NH3-N2 for inlet water of sewage disposal plant were about 30% and 50%, respectively; the increase of BOD5 concentration was about 50%. The biological effect of sewage treatment was improved significantly, the average CODcr concentration of outlet water dropped from 90 mg/L to 70 mg/L.

Key words: refinery, sour water, refining according to storage , sour water stripping, purified water , sewage disposal plant