研究报告
杨大壮,涂响,代云容,石国强,宋永会.均相Fenton法深度处理丙烯腈生化尾水[J].环境科学学报,2016,36(7):2460-2467
均相Fenton法深度处理丙烯腈生化尾水
- Advanced treatment of bio-treated effluent of acrylonitrile wastewater with homogeneous Fenton process
- 基金项目:国家水体污染控制与治理科技重大专项(No.2012ZX07202-002,2012ZX07202-005);国家科技支撑计划(No.2015BAK16B01)
- 杨大壮
- 1. 环境基准与风险评估国家重点实验室, 中国环境科学研究院, 北京 100012;2. 中国环境科学研究院城市水环境科技创新基地, 北京 100012;辽宁大学环境学院, 沈阳 110036
- 涂响
- 1. 环境基准与风险评估国家重点实验室, 中国环境科学研究院, 北京 100012;2. 中国环境科学研究院城市水环境科技创新基地, 北京 100012
- 代云容
- 1. 环境基准与风险评估国家重点实验室, 中国环境科学研究院, 北京 100012;2. 中国环境科学研究院城市水环境科技创新基地, 北京 100012
- 石国强
- 1. 环境基准与风险评估国家重点实验室, 中国环境科学研究院, 北京 100012;2. 中国环境科学研究院城市水环境科技创新基地, 北京 100012;3. 西安建筑科技大学环境与市政工程学院, 西安 710055
- 宋永会
- 1. 环境基准与风险评估国家重点实验室, 中国环境科学研究院, 北京 100012;2. 中国环境科学研究院城市水环境科技创新基地, 北京 100012;辽宁大学环境学院, 沈阳 110036
- 摘要:采用均相Fenton法深度处理丙烯腈生化处理工艺尾水,通过单因素法分析了H2O2投加量、Fe2+投加量、初始pH值和反应时间对尾水COD去除率的影响;并采用中心响应曲面法优化Fenton处理的工艺参数,得到最佳反应条件为:Fe2+投加量为1.02 mmol·L-1,H2O2投加量为11.13 mmol·L-1,初始pH值为3.66,反应时间为105 min,COD去除率达到61.1%。处理后尾水COD值低于50 mg·L-1,可满足石化行业一级排放标准。Fenton工艺对尾水中特征污染物均有较好的去除效果,最佳反应条件下丙烯腈、间苯二甲腈、3-氰基吡啶的去除率分别为99.5%、97.6%、73.7%;Fenton法对3种特征污染物的降解能力从大到小依次为:丙烯腈>间苯二甲腈>3-氰基吡啶。三维荧光光谱分析表明,尾水中存在大量类富里酸荧光物质,其中,紫外区类富里酸含量最高,Fenton工艺在较短反应时间和较少的试剂投加量条件下,便可有效地去除这类难降解物质。
- Abstract:Homogeneous Fenton process was applied in advanced treatment of bio-treated effluent of acrylonitrile wastewater. The effects of Fe2+ and H2O2 dosage, initial pH and reaction time on COD removals were evaluated according to the single-factor test, and response surface methodology based on central composite design was developed to optimize the parameters of the Fenton process. The optimum reaction conditions were Fe2+ dosage of 1.02 mmol·L-1, H2O2 dosage of 11.13 mmol·L-1, initial pH at 3.66, and reaction time of 105 min. Under the optimum reaction conditions, the COD removal efficiency was 61.1% and the COD concentration of treated effluent was lower than 50 mg·L-1, which could meet the top emission standard in petrochemical industry. The Fenton process showed high removal efficiencies on the typical pollutants, under the optimum reaction conditions; the removal efficiencies of acrylonitrile, m-phthalonitrile, and 3-cyanopyridine were 99.5%, 97.6% and 73.7%, respectively. The degradability of these three pollutants followed the order: acrylonitrile>m-phthalonitrile>3-cyanopyridine. Excitation-emission matrix spectra revealed that large amount of fulvic-like fluorescent substances existed in the bio-treated effluent of acrylonitrile wastewater, and the ultra-violet fulvic-like substance accounted for the largest proportion. The Fenton process could effectively remove the refractory substances in short reaction time and with a small amount of reagent dosage.
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