摘要
实验探究电催化氧化预处理技术对膜污染的影响。实验通过电催化氧化工艺过程中产生的强氧化剂羟基自由基(·OH)无选择地与纤维素、腐殖质等难降解的大分子有机物反应,将其降解为小分子有机物,以此减缓膜污染。实验发现,通过使用电催化氧化工艺作为预处理方式处理二沉池出水,当电极为二氧化铅电极,电流密度为20 mA/cm~2,反应停留时间为3 h时的处理效率为最佳条件,此条件下可以有效地减轻膜污染。
The experiment explored the effects of electrocatalytic oxidation pretreatment on membrane fouling.During the electrocatalytic oxidation process,the hydroxyl radical(·OH)was generated and the macromolecular organic matters such as cellulose,humus-like which are difficult to be degraded were degraded into small molecular organic substances by hydroxyl radicals,resulting in alleviating the Membrane fouling.The experiment shows that the electro-oxidation pretreatment has a better treatment effect in reducing membrane fouling.When the electrode was PbO_2 electrode,the current density was 20 mA/m~2,and the treatment efficiency was the best when the reaction residence time was 3 h.Under these conditions,membrane fouling can be effectively alleviated.
引文
[1]冯瑞齐.铝铁混凝剂对混凝—超滤联用工艺膜污染的影响研究[D].济南:山东大学,2016.
[2]陈立春.城市污水二级生化出水有机物膜分离过程与膜污染行为[D].哈尔滨:哈尔滨工业大学深圳研究生院,2015.
[3]HUANG W,WANG L,ZHOU W,et al.Effects of combined ozone and PAC pretreatment on ultrafiltration membrane fouling control and mechanisms[J].Journal of Membrane Science,2017,533:378-389.
[4]JIANG S,LI Y,LADEWIG B P.A review of reverse osmosis membrane fouling and control strategies [J].The Science of the Total Environment,2017,595:567-583.
[5]DUAN W S,ZHANG F F,TANG W X.Control of dissolved organic matter fouling ultrafiltration membrane treating a WWTP secondary effluent via multi-pretreatment[J].Desalination and Water Treatment,2016:1-9.
[6]刘百仓,吕田天,马军,等.强化混凝/超滤组合工艺膜清洗技术的研究[J].中国给水排水,2010,26(21):8-12.
[7]韩宏大,吕晓龙,陈杰.超滤膜技术在水厂中的应用[J].供水技术,2007,1(5):14-17.
[8]孙文鹏,李星,杨艳玲,等.膜污染程度的评价指标—膜孔堵塞率[J].膜科学与技术,2009,29(5):62-65.
[9]CHENG X X,LIANG H,DING A,et al.Effects of pre-ozonation on the ultrafiltration of different natural organic matter(NOM)fractions:Membrane fouling mitigation,prediction and mechanism[J].Journal of Membrane Science,2016,505:15-25.
[10]GONZALEZ-OIMOS R,PENADES A,GARCIA G.Electro-oxidation as efficient pretreatment to minimize the membrane fouling in water reuse processes[J].Journal of Membrane Science,2018,552:124-131.