城市型炼油厂含盐污水处理系统提质提效改造实践

UPGRADING SALINE WASTERWATER TREATMENT PLANT IN AN URBAN PETROLEUM REFINERY

日益增强的环保压力和居民维权意识对城市型炼油厂的生存和发展造成了巨大影响,如何利用紧张的建设用地对现有污水处理系统进行提标扩能改造成为工业界关注的热点。以中国石化湛江东兴石油化工有限公司含盐污水处理系统提标改造过程为例,通过对原系统进行全面诊断和分析,发现制约原系统处理效果的瓶颈问题,从而有针对性地比选和研发单元技术和设备,形成改造方案并付诸实施。改造后含盐污水处理系统处理量由60 m^3/h提升至100 m^3/h,工艺流程大为缩短。工业运行一年以来,外排水COD平均值为25.88 mg/L,氨氮质量浓度平均值为0.48 mg/L,总氮质量浓度平均值为10.79 mg/L,各项指标在稳定满足现行排放标准要求的同时,尚有能力应对企业的发展需求和国家未来更加严格的环保要求,为同类企业提供了有益的经验。

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 m^3 h to 100 m^3 h.One year commercial operation proved that the annual average of chemical oxygen demand(COD),NH 3 -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.