摘要
Abstract
There are many safety hazards in the purification process of drinking water.In order to improve the safety of drinking water,reduce the use of chemical agents,lower the risk of secondary pollution,and enhance the anti pollution ability and stability of membranes,low pressure nanofiltration membrane technology is adopted for household water treatment.By using a constant pressure flat plate cross flow filtration system and controlling the pre membrane pressure to 0.5 MPa,experiments were conducted to analyze the water purification effect of low pressure nanofiltration membranes in different seasons.The results showed that in spring and autumn,the removal rates of fluoride,microorganisms,and lead compounds by low pressure nanofiltration membranes reached 97.5%,96.8%,and 96.5%,respectively.In addition,the specific flux of low pressure nanofiltration membranes varies slightly in different seasons,demonstrating good stability and anti pollution ability.In terms of resistance changes,the self resistance increases significantly under winter water sources,reaching 0.4 N.The research results indicate that low pressure nanofiltration membrane technology can effectively remove harmful substances from water,improve water quality safety,and demonstrate good stability and anti pollution ability.关键词
低压纳滤膜/净水处理/化学清洗/恒流平板过滤/浓差极化Key words
low pressure nanofiltration membrane/water treatment/chemical cleaning/constant current plate filtration/concentration polarization分类
建筑与水利
