纳滤法处理含氟废水工艺条件的研究

采用Dow FilmTec公司的NF-90纳滤膜处理模拟含氟废水,主要考察了压力、pH、流量、温度、氟离子初始浓度等对膜渗透通量和氟离子截留率的影响。结果表明:压力升高,膜渗透通量增大,氟离子截留率先增大后减小;pH对膜渗透通量无明显影响,氟离子截留率随pH的升高而增大;流量升高膜渗透通量和氟离子截留率略有增大;温度升高,膜渗透通量增大,氟离子截留率降低;氟离子初始浓度增大,膜渗透通量减小,氟离子截留率降低。在压力1.0 MPa、pH 10.01、流量30 L/h、温度20℃的条件下NF-90膜截留率可达到95%;当处理氟浓度小于100 mg/L,出水氟浓度可达到国家工业一级排放标准。

Treatment of simulated wastewater containing fluoride by NF

The performance of NF-90 nanofiltration membrane is evaluated by treating simulated wastewater containing fluoride.The effects of pressure,pH,flux,temperature and initial fluoride concentration on the permeate flux and rejection of fluoride ions are investigated.The results show that with the rise of operation pressure,the permeate flux increases,and the rejection of fluoride ions increases first and then decreases.The pH has no distinct effect on the permeate flux.The rejection of fluoride ions increases with the increase of pH.Both the permeate flux and the rejection of fluoride ions increase slightly as the flux increase.With the rise of temperature,the permeate flux increases and the rejection of fluoride ions decreases.And both the permeate flux and the rejection of fluoride ions decrease as the initial fluoride concentration increases.Under the conditions as follows:10.00 of pH,1.0 MPa of trans-membrane pressure,30 L/h of flow rate and 20℃ of temperature,NF-90 ion rejection can reach about 95%.When dealing with fluoride less than 100 mg/L,fluoride concentration can achieve emissions standards of national level.