摘要
在现场开展了中试规模的臭氧光催化降解天然有机物的研究。研究表明,对大分子天然有机物占很大比例且重碳酸盐含量较高的地下水,臭氧投加量10 mg/L和反应时间10 m in条件下,TOC的去除率不到20%,但UV254和三卤甲烷生成潜力(THMFP)去除率分别达到近60%和33.5%。臭氧光催化与活性炭吸附相连,能显著提高UV254的THMFP的去除率,但TOC去除率并不明显高于单独活性炭吸附。臭氧光催化使大分子有机物转化为小分子有机物,后者在活性炭上的吸附性提高且生化性改善,可望在生物活性炭上更有效地去除。
A pilot scale ozone enhanced photocatalytic （O3/TiO2/UV） degradation of natural organic matter （NOM） was conducted on site. It was showed that, for the groundwater with high concentration bicarbonate and high ratio of macro molecules, its TOC removal was less than when the ozone dosage was 10 mg/L and retention time was 10 min. However, UV254 and THMFP were reduced nearly 60% and 33.5% respectively. When followed with GAC, UV254 and THMFP were much better reduced while TOC was not as compared with GAC alone. Macro molecules were transformed to smaller organic compounds by 03/TiO2/UV, which was much better absorbed by GAC and had improved biodegradability. Thus, it was predicted that OJTiO2/UV.BAC would be better than 03/TiO2/UV-GAC especially for TOC removal.
出处
《环境污染治理技术与设备》
CSCD
北大核心
2006年第8期18-22,共5页
Techniques and Equipment for Environmental Pollution Control
基金
国家高技术研究发展计划"863"项目(2002AA601250)
新世纪优秀人才支持计划资助项目
关键词
臭氧光催化
活性炭
天然有机物
腐殖质
分子量分布
ozone enhanced photocatalysis
activated carbon
natural organic matter
humic substances
molecule weight distribution
