纳 滤 处 理 燃 机 电 厂 清 洗 废 液 及 膜 污 染 研 究

Four types of nanofiltration membranes including NF 90，NF 270，NF 2001 and NF 5001，were used for the treatment of gas turbine compressor cleaning wastewater in gas turbine power plant. The effects of operating pressure，initial COD_Cr，temperature and pH on the performance of nanofiltration membranes were investigated. The results showed that when the operating pressure was 0.7 MPa，the four types of nanofiltration membranes had good retention effects on low molecular weight and refractory dissolved organic compounds in the waste liquid，and the produced water quality met the acceptance standard（COD_Cr≤500 mg/L）. The operating pressure increased within a certain range，the flux and COD_Cr retention rate of the four types of nanofiltration membranes showed varying degrees of increase. When the pressure increased from 0.6 MPa to 1.0 MPa，the COD_Cr of NF 2001 effluent decreased the most （70.73%），and the membrane flux of NF 5001 increased the most （28.14%）. An increase in initial COD_Cr resulted in a decrease in membrane flux and an increase in COD_Cr retention rate. As the temperature increased from 20 ℃ to 40 ℃ and the pH increased from 3 to 10，the flux of each membrane increased to a certain extent. In addition，at lower temperatures（20 ℃），the NF 270 membrane had a larger flux and a smaller irreversible flux value，which made it had a promising application for the treatment of gas turbine compressor cleaning wastewater.