粉煤灰对模拟河流中DMP的吸附实验研究
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摘要
以邻苯二甲酸二甲酯(DMP)为研究对象,以粉煤灰作为吸附剂,有机玻璃反应槽作为反应装置,向其持续注入初始浓度相同的DMP溶液,并对该反应进行吸附动力学方程拟合;同时,分析了DMP初始浓度、水流速度及吸附剂投加方式3种因素对粉煤灰去除DMP效率的影响。结果表明:①Elovich方程能较好地拟合粉煤灰对DMP的吸附行为;②随着水流速度的增加,粉煤灰对DMP的去除率升高,吸附量增加,在水流速度为0.42 m/s时,粉煤灰对DMP的最大吸附量为27.50μg/g;③溶液的初始浓度越小,投加相同质量的粉煤灰,其上可供吸附的活性点位比例越高,去除率升高。但是污染液之间的传质推动力减小,相同时间的吸附量会降低;④将粉煤灰全部平铺在槽子底部时,粉煤灰与DMP之间的接触面积最大,吸附速率增大,去除率升高,最高可达69.38%。
Dimethyl phthalate(DMP) was used to investigate the river pollution caused by pollutant leakage,with fly ash as the adsorbent and plexiglass reaction tank as the reaction device,DMP solution with the same initial concentration was injected into the reaction tank,and the adsorption kinetic equation was used to fit this reaction results.Moreover,the relations between the DMP initial concentration,water flow rate and adsorbent dosing method and removal efficiency of DMP on fly ash were analyzed.The results showed that the Elovich equation was more precise to fit the adsorption behavior of DMP on fly ash.The removal rate of DMP on fly ash and the adsorption amount increased with the water flow rate increasing,and the adsorption capacity of DMP on fly ash reached a maximum 27.50 μg/g when the velocity was 0.42 m/s.Adding the same mass of fly ash,the initial concentration of the solution was smaller and the higher percent of the activesite on adsorption and removal rate.However,the mass transfer driving force between the DMP molecules was reduced,the adsorption amount was reduced at the same time.Furthermore,the largest contact area between the fly ash and DMP was achieved with the fly ash lying on the bottom of the tank completely,the adsorption and removal rate was improved consequently,and 69.38%maximum removal rate was realized.
Dimethyl phthalate(DMP) was used to investigate the river pollution caused by pollutant leakage,with fly ash as the adsorbent and plexiglass reaction tank as the reaction device,DMP solution with the same initial concentration was injected into the reaction tank,and the adsorption kinetic equation was used to fit this reaction results.Moreover,the relations between the DMP initial concentration,water flow rate and adsorbent dosing method and removal efficiency of DMP on fly ash were analyzed.The results showed that the Elovich equation was more precise to fit the adsorption behavior of DMP on fly ash.The removal rate of DMP on fly ash and the adsorption amount increased with the water flow rate increasing,and the adsorption capacity of DMP on fly ash reached a maximum 27.50 μg/g when the velocity was 0.42 m/s.Adding the same mass of fly ash,the initial concentration of the solution was smaller and the higher percent of the activesite on adsorption and removal rate.However,the mass transfer driving force between the DMP molecules was reduced,the adsorption amount was reduced at the same time.Furthermore,the largest contact area between the fly ash and DMP was achieved with the fly ash lying on the bottom of the tank completely,the adsorption and removal rate was improved consequently,and 69.38%maximum removal rate was realized.
引文
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[2]Rui Y,Shen D,Khalid S,et al.GIS-based emergency response system for sudden water pollution accidents[J].Physics&Chemistry of the Earth,2015,s79/80/81/82:115-121.
[3]You X Y,Zhang C X.On real-time risk evaluation of accident in water quality control zone[J].Ecological Indicators,2018,93:123-128.
[4]Dong L,Liu J,Du X,et al.Simulation-based risk analysis of water pollution accidents combining multi-stressors and multi-receptors in a coastal watershed[J].Ecological Indicators,2018,92(9):161-170.
[5]米敬,李北罡.不同粉煤灰对弱酸性深蓝5R的吸附性能研究[J].内蒙古农业大学学报:自然科学版,2014(4):64-70.
[6]王锐刚,成坚.改性粉煤灰处理生活污水中磷的试验研究[J].水处理技术,2013,39(1):97-100.
[7]Wei L,Wang K,Zhao Q,et al.Kinetics and equilibrium of adsorption of dissolved organic matter fractions from secondary effluent by fly ash[J].Journal of Environmental Sciences,2011,23(7):1057-1065.
[8]高旭,刘宇飞,郭劲松,等.活性炭和沸石滤柱对饮用水中邻苯二甲酸酯类吸附性能的比较[J].水处理技术,2009,35(3):57-61.
[9]Xie H J,Ma Q,Tan W,et al.Adsorption of phthalate esters(PAEs)from aqueous solution onto activated carbons from softstem bulrush[J].Advanced Materials Research,2011,152/153:791-796.
[10]魏晓岩,汪月,杨素,等.交联淀粉吸附特性及吸附动力学研究[J].食品与发酵科技,2018,54(1):50-56.
[11]王苗.不同基质对内分泌干扰物邻苯二甲酸二丁酯的吸附特性研究[D].西安:长安大学,2016.
[12]张小娜.改性热解炭对水体有机物的吸附研究[D].郑州:郑州大学,2014.
[13]郭宏栋,周敏,童丹,等.邻苯二甲酸酯在黄河沉积物上的吸附特性[J].环境科学与技术,2009,32(1):6-9.
[14]张进,左聪韵,田浪,等.邻苯二甲酸二甲酯表面印迹微球的合成及吸附性能评价[J].材料导报,2013,27(16):151-154.
[15]阙付有,曾抗美,李旭东.ACF吸附法处理苯酚泄漏造成的河流突发污染事故模拟研究[J].环境科学学报,2008,28(12):2554-2561.
[16]杨滨银,晁群芳,陈志丹,等.一株菲降解菌的筛选及降解动力学分析[J].环境污染与防治,2013,35(4):62-66.
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