摘要
研究了城市污水厂二级处理出水的臭氧氧化特性及其动力学规律。结果表明，臭氧氧化可以显著提高二级处理出水的可生化性，当臭氧投量为10mg／L、接触时间为2min时，可使其BDOC和TOC／UV254值分别提高约1倍；当接触时间为4min时，臭氧氧化对COD、TOC的去除率分别达到25．7％和16．5％，使UV254和色度分别降低了62．31％和79．25％，同时分子质量〈1ku的有机物所占比例由原来的52．9％升高到72．6％。当接触时间从2min延长到30min时，对NH3-N的去除率由1．3％增加到22．5％。拟合结果表明，在（0～1．6）、（1．6～16）和（16～30）min的时段内，臭氧氧化反应均为一级反应，但反应速率逐渐降低。
The ozonation characteristics and kinetics of secondary effluent from WWTP were studied. The results indicate that the ozonation can improve the biodegradability of the secondary effluent remarkablely. The BDOC and TOC/UV254 ratio are doubled when the ozone dosage is 10 mg/L, and the contact time is 2 min. When the contact time is 4 min, the removal rates of COD and TOC reach 25.7% and 16.5% respectively, and UV254 and colority are decreased by 62.31% and 79.25% respectively. The ratio of organic matters with MW 〈 1 ku is increased from 52.9% to 72.6%. When the contact time is extended from 2 min to 30 min, the removal rate of NH3 - N is increased from 1.3% to 22.5%. The fitting results show that the ozonation reaction conforms to first-order reaction kinetics within intervals of 0 to 1.6 min, 1.6 to 16 min and 16 to 30 min, but the reaction rate decreases gradually.
出处
《中国给水排水》
CAS
CSCD
北大核心
2007年第23期79-81,86,共4页
China Water & Wastewater
基金
教育部重大项目培育基金资助项目(705013)
