摘要
城市污水处理厂出水的纳米过滤浓缩液较难直接生物处理。臭氧氧化该浓缩液降低ＤＯＣ的速度较慢，但是可以有效地破坏该浓缩液中含苯环和有色基团的大分子有机物，显著增加小分子有机物的相对含量，从而增大其可生化降解性能。研究发现臭氧的投量为５２ｍｇ／Ｌ左右时，臭氧化改善该纳米过滤浓缩液的可生化降解性能的效果最佳。
The nanofiltration concentrate of effluent from municipal wastewater treatment plant was difficult to be biotreated directly. The influence of oxidation by ozone on the molecular weight distribution of the DOC of the nanofiltration concentrate was studied. Due to the ozonation, the percentage of small molecules increased while the UV adsorption of 254 nm and 436nm decreased much more than the DOC. As a result from this behavior, the biodegradability of the oxidized concentrate was enhanced. The consecutive aerobic biotest (Zahn Wellens test) showed that when the ozone dosage was around 52mg/L, it could improve the biodegradability of this nanofiltration concentrate to optimum, if compared with the DOC reduction of the direct ozone mineralization.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
1998年第4期353-355,共3页
China Environmental Science
