摘要
为了强化曝气生物滤池(BAF)-臭氧组合工艺的处理效果,以石化二级出水为处理对象,研究了投加Fe SO_4·7H_2O对组合工艺处理COD和TP效果的影响,同时采用分子量分级、三维荧光扫描、气相色谱-质谱联用仪(GC-MS)等手段对工艺处理前后水质进行了系统分析.结果表明,在二级出水COD平均浓度82.91 mg·L^(-1),TP平均浓度1.37 mg·L^(-1),Fe SO_4·7H_2O投加浓度为9 mg·L^(-1)时,组合工艺COD平均去除率为52.20%,TP平均去除率为71.50%,相比不加Fe SO_4·7H_2O的对照组,COD去除率提高17.15%,除磷效率提高51.81%.原水中相对分子质量小于1×103的有机物占52%,铁盐强化组合工艺处理后该部分比例增加至75.39%;同时各区间分子量的有机物去除效率提高.三维荧光分析结果表明,Fe SO_4·7H_2O可以提高BAF-臭氧对水中荧光类物质的去除效果.GC-MS结果表明,与对照组相比,Fe SO_4·7H_2O的投加使得出水中有机物的种类减少,浓度降低.铁盐可以强化BAF-臭氧组合工艺处理石化二级出水的能力.
Two parallel biological aerated filters（ BAF）-ozonation,named as number 1（ feeding with Fe SO4·7H2O） and number 2,were used to treat petrochemical secondary effluent. The effect of Fe SO4·7H2O on COD and phosphorus removal by BAF-ozonation was studied. Molecular weight distribution,three-dimensional fluorescence scan and gas chromatography-mass spectrometry（ GC-MS） were used to analyze water quality before and after BAF-ozonation. The results showed the average COD and TP concentrations were 82. 91mg·L^-1and 1. 37 mg·L^-1,respectively. When the dosage of Fe SO4·7H2O was 9 mg·L^-1,the average removal rates of COD and TP were 52. 20% and 71. 50%,respectively. The average COD removal rate in number 1 combined process was 17. 15%,which was higher than that in number 2 combined process. The TP removal rate in number 1 combined process was increased by 51. 81%. The percentage of dissolved organic matters with relative molecular weight less than 1 × 103 was 52% in the raw wastewater. However,the percentage increased to 75% when treated by number 1 combined process and the removal rate of various molecular weight organics was increased.Three-dimensional fluorescence analysis showed that the dosage of Fe SO4·7H2O could improve the removal of fluorescent substances. GCMS results showed that the number and concentration of organics were reduced after number 1 combined process in comparison with number 2 combined process. BAF-ozone could be enhanced by Fe SO4·7H2O when treating petrochemical secondary effluent.
作者
徐敏
吴昌永
周岳溪
郭明昆
王翼
XU Min WU Chang-yong ZHOU Yue-xi GUO Ming-kun WANG Yi(College of Water Science, Beijing Normal University, Beijing 100875, China Research Center of Water Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China College of Earth Science and Environment Engineering, Southwest Jiaotong University, Chengdu 611756, China School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2017年第1期229-237,共9页
Environmental Science
基金
国家水体污染控制与治理科技重大专项(2012ZX07201-005)
国家自然科学基金项目(51208484)
关键词
石化废水二级出水
深度处理
BAF-臭氧
相对分子质量分布
有机物
petrochemical secondary effluent
advanced treatment
BAF-ozonation
relative molecular weight distribution
organic matter
