Combined Process of H2O2-Nanofiltration for Advanced Treatment of Surface Water
Although nanofiltration(NF)membrane technology is well suited for surface water treatment,the treatment process is limited by problems such as membrane fouling and low rejection of soluble organic matter.To solve the above problems,a new hybrid process(H2O2-NF hybrid process)was studied,which aimed to achieve the increase of surface water rejection effect and the reduction of NF membrane fouling.In this study,H2O2 treatment was investigated as a pretreatment during NF treatment of surface water.Filtration experiments were performed to evaluate the effects of moderate oxidative pretreatment on surface water rejection performance and NF membrane fouling.The results showed that compared to H2O2 oxidation alone and NF membrane filtration alone,the H2O2-NF hybrid process provided enhanced treatment of surface water,with the highest removal rates of 97.6％and 98.5％for UV254 and total organic carbon(TOC),respectively,and 51.1％and 50.9％for TDS and conductivity,respectively.H2O2 oxidation as a pre-membrane pretreatment significantly alleviated 58.5％of the membrane flux reduction and alleviated most of the membrane fouling on the membrane surface,because H2O2 oxidized macromolecular organic pollutants in surface water into small molecules or inorganic substances such as CO2 and H2O.In addition,the H2O2-NF hybrid process also showed significant removal of fluorescent organics from surface water.Considering the excellent H2O2-NF hybrid process performance,it can be concluded that the H2O2-NF hybrid process has considerable potential for application in the treatment of surface water.
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