陶瓷膜的三步法清洗及效果分析

采用超滤膜处理油田采出污水,通过陶瓷膜和篮式过滤器上无机垢的组成及陶瓷膜SEM形貌分析,研究了陶瓷膜清洗过程中药剂及离子浓度的变化、跨膜压差的变化等参数,考察了膜运行过程中的跨膜压差和产水量的变化情况.确定了具有针对性的碱洗-络合剂洗-氧化剂洗三步法清洗对污染的ZrO2陶瓷膜进行40℃低温清洗.中试试验结果表明清洗后,...

Study on three-step cleaning of ceramic membrane and analysis of its effects

Ultrafiltration membrane was used to treat oilfield produced water.According to the analysis of the composition of inorganic scales on ceramic membrane and basket strainer and the SEM photos of the ceramic membrane′s cross section,the variation of parameters such as: reagent and ion concentration,transmembrane pressure and so on during the course of cermic membrane cleaning were studied;meanwhile,the variation of transmembrane pressure and water production during the membrane operation were also investigated.The alkali-complexing agent-oxidizer three-step washing was finally determined to be the proper process for fouled ZrO2 ceramic membrane cleaning at a temperature of 40 ℃.The results of the pilot scale test showed that,after the cleaning,the recovery rates of membrane flux at high and low pressure terminals were 97.1% and 116.8% respectively,the maximum operation time reached 68 h.The said process had a good repeatability,moreover,the advantages of it on aspects of cost control,operating condition,cleaning effect and so on were also obvious.