摘要
采用KMnO4、NaClO、O3和ClO2等四种氧化剂氧化与半程混彬陶瓷膜超滤集成工艺处理微污染东江原水，研究氧化剂对去除有机物及原位控制膜污染的影响。结果表明，在四种氧化剂中臭氧对有机物的去除作用最为明显，投加量为3mg／L时集成工艺对CODMn和UV254的去除率分别达到60％、68％，与未投加时相比提高幅度较大，且臭氧投加量〉1mg／L后工艺出水中分子质量为1～5ku的有机物含量明显降低，而200～500u的有机物含量增加。其他三种氧化剂对有机物的去除作用弱于臭氧，在试验的投加量范围内，对UV254和CODMn的去除率升幅分别小于8％和10％，且氧化剂对有机物的分子质量分布基本没有影响。但是，四种氧化剂均能使膜污染得到一定程度的减轻，氧化剂对UV254、CODMn和分子质量分布三个层次的影响均能降低膜污染，并不需要改变有机物的分子质量分布，改变有机物的空间形态就可以减轻膜污染。氧化剂还能降低工艺出水的消毒副产物生成势，对THMFP和HAAFP的去除率相比未投加氧化剂时分别提高了10％和20％左右。
To investigate the effects of different oxidation processes on removal of organic compounds and control of ceramic membrane fouling in half coagulation/ceramic membrane filtration process, KMnO4, NaClO, 03 and CIO2 were used as oxidants and surface water from East River was used as raw water. Ozone showed the best performance in removing organic compounds. The removal rates of UV254 and CODMn were 68% and 60% respectively after adding 3 mg/L of ozone, a significant improvement on before the adding. The concentration of organic compounds with MW of 1 to 5 ku was significantly reduced and that of 200 to 500 u was increased with ozone dosage of more than 1 mg/L. The removal rates of UV254 and CODM. were increased by less than 8% and 10%, respectively, after adding KMnO4, NaClO and Cl02. The molecular weight distribution of organic types of oxidants could all alleviate membrane fouling. The c compounds was hardly affected. The four hanges of UV254, CODM., and molecular weight distribution of organic compounds could all affect membrane fouling. Membrane alleviated by changing the spatial structure of organic compounds but not by c weight distribution. The removal rates of THMFP and HAAFP were increased by tively, after the addition of oxidants. hanging fouling could be their molecular 10% and 20%, respectively, after the addition of oxidants.
出处
《中国给水排水》
CAS
CSCD
北大核心
2013年第13期6-10,共5页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2008ZX07423)
关键词
半程混凝
氧化
陶瓷膜
膜污染
消毒副产物
half coagulation
oxidation
ceramic membrane
membrane fouling
DBPs
