国产PVDF中空纤维膜在炼油废水深度处理回用中的应用

摘要

中国石化海南炼油化工有限公司采用膜生物反应器(MBR)工艺处理炼油废水,以达到深度处理后回用的目的.采用国产聚偏氟乙烯(PVDF)中空纤维膜可保证MBR系统的处理效果,MBR出水的COD质量浓度平均值为41 mg/L、石油类物质质量浓度低于1 mg/L、NH3-N质量浓度低于0.81 mg/L,可满足补充循环冷却水的标准.以国产PVDF中空纤维膜更换进口膜,保持膜产水量低于设计通量,能降低膜的污染速率,保持稳定的膜通量.通过保持适宜的污泥浓度,定期排泥,并采用空气擦洗、在线反冲洗、高浓度和低浓度交替的化学在线清洗及定期的离线清洗,国产PVDF中空纤维膜可保持良好的过滤性能.%Membrane bioreactor (MBR) is applied in refining wastewater advanced treatment for water reuse at SINOPEC Hainan Petrochemical Company.Using domestic PVDF hollow fiber membrane to substitute the import one, the quality of treated effluent still can meet the quality requirements for reuse as makeup of circulating water, having average COD of 41 mg/L, average hydrocarbons and NH3-N of below 1 mg/L and 0.81 mg/L, respectively.Keeping membrane flux less than the design value could slow down the rate of membrane fouling and maintain a stable membrane flux.However, in order to keep the domestic PVDF hollow fiber membrane under good conditions, proper online cleaning and routine offline cleaning are essential, besides, retaining appropriate sludge concentration and discharging sludge regularly are also important.