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

作　　者：杨大壮[1,2,3] 涂响[1,2] 代云容[1,2] 石国强[1,2,4] 宋永会[1,2,3] 

机构地区：[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]辽宁大学环境学院,沈阳110036 [4]西安建筑科技大学环境与市政工程学院,西安710055

出　　处：《环境科学学报》2016年第7期2460-2467,共8页Acta Scientiae Circumstantiae

基　　金：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)~~

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H_2O_2投加量、Fe^(2+)投加量、初始p H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:Fe^(2+)投加量为1.02 mmol·L-1,H_2O_2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.Homogeneous Fenton process was applied in advanced treatment of bio-treated effluent of acrylonitrile wastewater. The effects of Fe^（2＋）and H_2O_2 dosage,initial p H 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 Fe^（2＋）dosage of 1. 02mmol·L^（-1）,H_2O_2 dosage of 11.13 mmol·L^（-1）,initial p H 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： acrylonitrilem-phthalonitrile3-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.

关 键 词：丙烯腈 生化尾水 FENTON法 响应面法 特征污染物 三维荧光 

分 类 号：X703[环境科学与工程—环境工程]