摘要
开展间歇性试验(中试规模为24 m3/d)研究臭氧对某城镇污水处理厂二级生化出水的氧化特性,考察了臭氧对COD的去除效果。结果表明,当臭氧投加量为40 mg/L、氧化接触时间为1.0 h、系统进水COD和色度平均值分别为69 mg/L和115倍时,出水COD和色度平均值分别降至45 mg/L和12倍,达到GB 18918—2002的一级A标准。单独采用臭氧工艺的直接运行成本为0.34元/m3水。污水厂二级生化出水的有机物分子质量基本小于2 000 u,经臭氧氧化后,分子质量<730 u的有机物比例由30%上升到54%。臭氧氧化对分子质量<500 u的烷烃化合物具有较好的氧化作用,但对该分子质量范围内的含多种取代基的芳香族化合物的氧化性较差。
The ozonation of the secondary biochemical effluent from a municipal wastewater treatment plant was studied through sequencing batch test. The COD removal efficiency was investigated in pilot scale with a capacity of 24 ma/d. When the ozone dosage was 40 mg/L and oxidation time was 1.0 h, the average COD and color decreased from 69 mg/L and 115 times in the influent to 45 mg/L and 12 times in the effluent. The effluent quality met the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （GB 18918 -2002）. The direct operating cost was 0.34 yuan/m^3. The organic molecular weight in the secondary biochemical effluent was less than 2 000 u. The organic matter with molecular weight below 730 u increased from 30% to 54% after ozonalion. Ozonation could easily oxidize the alkane compounds with molecular weight below 500 u, but showed poor oxidation effect of the aromatic compounds containing various substituents.
出处
《中国给水排水》
CAS
CSCD
北大核心
2015年第15期72-76,共5页
China Water & Wastewater
基金
浙江省重大科技专项(2012C03002-1)
关键词
臭氧
城镇污水厂
二级生化出水
COD
ozone
municipal wastewater treatment plant
secondary biochemical effluent
COD
