摘要
利用处理量为3L/d的臭氧陶瓷膜-生物活性炭（BAC）（工艺Ⅰ）和陶瓷膜-BAC（工艺Ⅱ）2种组合工艺处理受污染的原水,研究了工艺对原水中浊度、氨氮和有机物的去除效果,同时考察了臭氧对膜通量和BAC的影响.结果表明,未投加臭氧和2.0mg/L臭氧投加量下,两种组合工艺可去除原水中96%以上的浊度.组合工艺均可去除原水中1.0-2.0mg/L的氨氮.提高溶解氧浓度至30mg/L可强化氨氮的去除能力,两种组合工艺可至少彻底去除5.5mg/L的氨氮.投加2mg/L臭氧后,工艺Ⅰ可去除原水中48.3%的总有机碳（TOC）和51.8%的UV254.工艺Ⅱ对TOC和UV254的平均去除率分别为51.1%和48.2%.臭氧对浊度的去除无影响,但臭氧可改变部分有机物的结构,减轻膜的有机物污染.与未投加臭氧的工艺Ⅱ相比,投加臭氧使工艺Ⅰ中的膜通量提高了25%-30%.但残留臭氧可能影响后续BAC中的微生物,对BAC去除氨氮和有机物的能力产生不利影响.
Two combination processes, including ozonation-ceramic membrane-biological activated carbon （BAC） （processⅠ） and ceramic membrane-BAC （processⅡ）, were tested to treat polluted raw water. The performance was evaluated with the removal efficiencies of turbidity, ammonium and organic matters in a scale of 3L/d.The effects of ozone on membrane flux and BAC were also considered. More than 96% of turbidity was removed by both combination processes either with or without ozone addition. The ammonium that can be removed by both processes was limited to 1.0-2.0mg/L. Increasing the dissolved oxygen to 30.0mg/L can lead to a complete removal of ammonium with the concentration as high as 5.5mg/L. The average removal efficiencies of the total organic carbon （TOC） and ultraviolet absorbance at 254nm were 48.3% and 51.8% for processⅠwithout ozone addition, 51.1% and 48.2% for processⅡwhen ozone dosage was 2.0mg/L. Ozonation had no effect on turbidity removal, while it resulted in the changes of organic molecular structure at an ozone dosage of 2.0mg/L and this helped alleviate the membrane fouling. Membrane flux in processⅠincreased by 25%-30% compared with that in processⅡ with no ozone addition. However, residual ozone may affect the microbial activities in the BAC, which impacted the removals of organic matter and ammonia negatively.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2013年第11期1946-1952,共7页
China Environmental Science
基金
国家水专项(2008ZX07423-002-4)
广东省科技计划项目(2012B030800001)
关键词
臭氧
陶瓷膜
生物活性炭
超滤
污染原水
ozone
ceramic membrane
biological activated carbon
ultrafiltration
polluted raw water
