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褐煤对煤气化废水COD的吸附脱除特性 预览

Adsorption Behavior of COD in Coal Gasification Wastewater on Lignite
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摘要 以褐煤作为吸附剂,研究了不同反应时间、反应温度、COD初始浓度、煤水比等条件下,褐煤对煤气化分离水COD的吸附脱除能力,并进行了吸附反应动力学和等温吸附热力学分析。研究结果表明:褐煤对COD的吸附更为符合准二级动力学模型,其吸附过程主要由液膜扩散步骤控制;Freundlich等温吸附方程更能准确地描述褐煤对COD的吸附反应机制,通过热力学分析可知,该吸附反应为物理吸附,且为自发、放热、熵减的反应;褐煤对高浓度废水COD的吸附脱除率可达90%,但此时煤用量较大(研究达到了400g/L),说明采用褐煤对未经生化处理的废水进行完全的COD脱除是不现实的,但可以较低的煤水比作为一种廉价的COD预脱除手段,降低后续生化处理的难度。 In this study,a lignite was used as the adsorbent to remove COD in coal gasification wastewater at controlled conditions of reaction time,temperature,initial concentration,coal loading,etc. The adsorption behaviors were analyzed with reaction kinetic models and isothermal models. The results indicated that the adsorption reactions of COD on the lignite could be explained well by pseudo-second-order model,and the reaction rate was controlled mainly by film diffusion. In isothermal tests,Freundlich model could describe the mechanism of the adsorption of COD on the lignite. Through calculating the thermodynamic parameters,the adsorption was found spontaneous,exothermic and entropy dropping. Although the removal rate of COD reached as high as about 90%,the coal loading was so large as to use this method to completely remove COD in actual coal gasification wastewater treatment. However,this method could be used at a lower coal loading as a pretreatment with the purpose of decreasing treating difficulty for the subsequent bio-chemical treatment.
作者 涂亚楠 杨国枢 郭辉 洪志松 黄宇峰 柳铭哲 孙健翔 TU Ya-nan;YANG Guo-shu;GUO Hui;HONG Zhi-song;HUANG Yu-feng;LIU Ming-zhe;SUN Jian-xiang(School of Chemical and Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
机构地区 中国矿业大学
出处 《煤炭工程》 北大核心 2019年第2期130-134,共5页 Coal Engineering
基金 国家自然科学基金青年基金资助项目(51504261) 国家自然科学基金面上资助项目(51574251).
关键词 煤气化废水 COD 褐煤 吸附 脱除 coal gasification wastewater COD lignite adsorption remove
作者简介 涂亚楠(1984—),男,山东潍坊人,博士,讲师,主要研究方向为水煤浆制备技术、洁净煤技术,E-mail:201315@cumtb.edu.cn。
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