Abstract: The increasing pressure of environmental protection and residents' awareness of rights protection have exerted a huge impact on the survival and development of urban refineries. Moreover, the range of land use is difficult to expand anymore. Great attentions have been paid on seeking the solution to upgrade or reconstruct wastewater treatment plant (WTP) on precious land. This paper introduces such a case at SINOPEC Zhanjiang Dongxing petrochemical company. The reconstruction scheme was proposed based on the systematic diagnosis on problems existed in the original WTP. In order to deal with these key problems, specialized technologies were studied. After reconstruction, the capacity of WTP has been increased from 60 m3/h to 100 m3/h. One year commercial operation proved that the annual average of chemical oxygen demand (COD), NH3-N and total nitrogen (TN) was as low as 25.88 mg/L, 0.48 mg/L and 10.79 mg/L, respectively, far lower than the standard. The successful experience indicates that the revamping process can be used in similar urban petroleum refineries, which would be beneficial to the sustainable development of the enterprise.

Key words: refining wastewater, urban refinery, fluidized, carrier, upgrading and reconstruction