臭氧预氧化对石化污水厂二级出水水质的作用  

Effect of pre-ozonation on biological effluent of petrochemical wastewater treatment plant

作　　者：高祯[1,2] 吴昌永[1] 周岳溪[1] 宋嘉美[1,2] 刘明国[1,3] 常丽君 

机构地区：[1]中国环境科学研究院水污染控制技术研究中心,北京100012 [2]河北工程大学城市建设学院,河北邯郸056038 [3]中国地质大学水资源与环境学院,北京100083 [4]中国石油吉林石化污水处理厂,吉林省吉林市132000

出　　处：《化工学报》2013年第9期3390-3395,共6页CIESC Journal

基　　金：国家水体污染控制与治理科技重大专项(2012ZX07201-005)~~

摘　　要：研究了臭氧预氧化对石化企业综合污水处理厂二级出水水质的改善作用,采用分子量分级、气相色谱质谱联用仪、三维荧光扫描等手段对臭氧预氧化前后水质进行了系统分析,并对预处理前后的二级出水采用曝气生物滤池进行了对比处理研究。结果表明,在二级出水平均COD为77.8mg·L-1,臭氧投量为10mg·L-1,接触时间为4min的条件下,臭氧预氧化对COD的平均去除率为11.4%,对UV254的平均去除率为23.9%。臭氧预氧化能够去除水中含不饱和键以及溶解性微生物产物和腐殖酸类等难降解有机物,改变了废水中有机物的分子结构,使水中分子量小于1×103的有机物比例从53%提高至67%。预氧化后废水经BAF处理,其COD去除量较二级出水直接经BAF处理提高了14.9%。Refractory organics are the main composition of residual COD in the effluent of s petrochemical biological wastewater treatment plant.It is the bottleneck in improving water quality with biological methods.The effect of pre-ozonation on a typical petrochemical biological effluent was studied.Molecular weight distribution（MWD）,3-D fluorescence scan,gas chromatography-mass spectrometry（GC-MS）were used to analyze water quality before and after pre-ozonation.The removal rates of COD and UV254 were 11.4% and 23.9% respectively with an ozone dosage of 10 mg·L-1 and a duration of 4 min.Pre-ozonation could remove the refractory organics,such as soluble microbial products（SMP）and humic acids,including some unsaturated bond organics.Pre-ozonation changed the MWD of the wastewater,increasing the percentage of small-molecular-weight organics（1×103）from 53% to 67%.And it greatly improved the ability of bio-treatment performance of wastewater.Compared with the original biological effluent,COD removal rate of pre-oxidation wastewater treated by the biological aerated filter（BAF）increased by 14.9%.

关 键 词：石化废水 臭氧 预氧化 可生物降解性 分子量分布 

分 类 号：X703.1[环境科学与工程—环境工程]