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  • 李萌,陈爱侠,陈贝,胡卫星,孟建昊,韩融.粉煤灰对模拟河流中DMP的动态吸附[J].环境工程学报,2019,13(5):1092-1098.DOI:10.12030/j.cjee.201811114    [点击复制]
  • LI Meng,CHEN Aixia,CHEN Bei,HU Weixing,MENG Jianhao,HAN Rong.Dynamic adsorption of dimethyl phthalate onto fly ash in the simulated river[J].,2019,13(5):1092-1098.DOI:10.12030/j.cjee.201811114   [点击复制]
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粉煤灰对模拟河流中DMP的动态吸附
李萌1,2,陈爱侠1,2,陈贝3,胡卫星1,2,孟建昊1,2,韩融1,2
0
(1.长安大学环境科学与工程学院,西安 710054;2.旱区地下水文与生态效应教育部重点实验室,西安 710054;3.长安大学海威环境技术公司,西安 710054)
摘要:
针对污染物泄露导致的河流污染问题,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,将其所得实验数据拟合Logistic穿透模型,研究模拟河流条件下,粉煤灰对DMP的动态吸附规律;同时,分析了水流速度、DMP初始浓度及吸附剂投加方式3种因素对粉煤灰去除DMP性能的影响。结果表明:Logistic穿透模型能较好地拟合河流中粉煤灰动态吸附DMP的过程;提高溶液的进水流速,污染物更容易穿透吸附剂表面,单位时间内的最大吸附量由17.81 μg·g-1增加至27.78 μg·g-1,最大去除率由35.63%升高至55.57%,穿透时间提前;随着DMP溶液初始浓度的增加,粉煤灰与DMP分子之间的浓度差增大,相同时间内与粉煤灰接触的DMP污染物增多,达到饱和的时间由131 min缩短至119 min,穿透曲线上的穿透点左移,粉煤灰的吸附性能提高;将粉煤灰全部平铺在槽体底部时,吸附质能够充分地与其接触,传质阻力减小,吸附速率常数由0.003 9提高至0.004 7,粉煤灰的吸附率升高。该研究可为河流突发性污染的应急处理提供一定理论依据。
关键词:  河流突发污染事故  塑料增塑剂污染  邻苯二甲酸二甲酯  粉煤灰  模拟河流
DOI:10.12030/j.cjee.201811114
投稿时间:2018-11-17
基金项目:国家自然科学基金青年基金资助项目21407012; 陕西省自然科学基金基础研究计划项目2015JQ5178国家自然科学基金青年基金资助项目(21407012); 陕西省自然科学基金基础研究计划项目(2015JQ5178)
Dynamic adsorption of dimethyl phthalate onto fly ash in the simulated river
LI Meng1,2,CHEN Aixia1,2,CHEN Bei3,HU Weixing1,2,MENG Jianhao1,2,HAN Rong1,2
(1.School of Environmental Science and Engineering, Chang'an University, Xi'an 710054, China;2.Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region, Ministry of Education, Xi'an 710054, China;3.Chang'an University Haiwei Environmental Technology Company,Xi'an 710054, China)
Abstract:
For the sudden environmental problems by pollutants leakage, the dynamic adsorption of dimethyl phthalate (DMP) onto fly ash was conducted in a simulated river unit, which was made of a plexiglass reaction tank, and a continuous injection of DMP with the same initial concentration into it. The experimental data were fitted by the Logistic penetrating model, and the effects of flow rate of the river, DMP initial concentration and adsorbent dosing ways on adsorption performance of fly ash were analyzed. The results showed that the Logistic penetrating model yielded an accurate and reliable fit for the dynamic adsorption process of DMP onto fly ash with a high R2 value of 0.992. With the increase of influent flow rate, DMP could more easily penetrate the surface of adsorbent, the adsorption capacity per unit time increased from 17.81 μg·g-1 to 27.78 μg·g-1, the maximum removal rate increased from 35.63% to 55.57%, the breakthrough time was shortened accordingly. An increase of the initial concentration of DMP solution was found to enlarge the concentration difference between the DMP and the fly ash, improve DMP amount in contact with the adsorbent per unit time. Then the time to reach saturation was shorten from 131 min to 119 min, the breakthrough point on the breakthrough curve shifted to left, and the adsorption performance of fly ash was improved. A complete distribution the fly ash on the bottom of tank could form enough contact between the fly ash and DMP and reduce the mass transfer resistance, the adsorption rate coefficient increased from 0.003 9 to 0.004 7, and the adsorption capacity of fly ash increased. This study will provide some theoretical references for emergent treatment of sudden river pollution accidents.
Key words:  sudden river pollution accidents  plastic plasticizer pollution  dimethyl phthalate  fly ash  simulated river