改性天然沸石对煤化工废水中高浓度NH_(4)^(+)的吸附和再生研究  

Adsorption and regeneration performances of the modified zeolite for high-concentration ammonium in real coal chemical wastewater

作　　者：刘磐 LIU Pan(School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Xi’an Aeronautical Polytechnic Institute,Xi’an 710089,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]西安航空职业技术学院,陕西西安710089

出　　处：《工业水处理》2024年第7期141-149,共9页Industrial Water Treatment

基　　金：陕西省重点产业链创新项目(2019ZDLSF-06);西安航空职业技术学院校级自然科学一般项目(22XHZK-10)。

摘　　要：针对目前常用的蒸氨法和吹脱法去除煤化工废水中高浓度氨氮带来的能耗高、处理成本高、操作复杂等实际问题,对天然沸石进行改性,探究改性沸石对煤化工废水中高浓度氨氮的吸附性能和化学再生性能。结果表明,相较于未改性天然沸石,经300℃热处理与1.5 mol/L NaCl溶液协同改性后,沸石的比表面积由18.541 m^(2)/g增加至32.198 m^(2)/g,吸附容量提升了74%,NH_(4)^(+)去除率达88.94%。吸附动力学和等温线分析表明,改性沸石对煤化工废水中高浓度NH_(4)^(+)的吸附过程符合化学多层吸附过程。0.100 mol/L NaClO溶液对改性沸石再生效果最好,再生率高达94.5%,且可将再生NH_(4)^(+)转化为无毒、无害的N_(2),实现了沸石的高效、可持续再生,且无二次污染。In view of the practical problems of high energy consumption,high treatment cost and complicated operation caused by the current high-concentration ammonia nitrogen removal method in coal chemical wastewater,such as the steaming ammonia and stripping method,the natural zeolite was modified to investigate the adsorption and chemical regeneration performance of the modified zeolite on the high concentration of ammonia nitrogen in coal chemical wastewater.The results showed that the specific surface area of zeolite increased from 18.541 m^(2)/g to 32.198 m^(2)/g after the synergistic modification processes by heat treatment at 300℃and brine leaching in 1.5 mol/L NaCl solution.Compared with the natural zeolite,the adsorption capacity increased by 74%and the removal efficiency of NH_(4)^(+)also reached to 88.94%.The adsorption kinetic and isotherm analysis showed that the adsorption process of high-concentration NH_(4)^(+)by modified zeolite in coal chemical wastewater was consistent with the chemical multilayer adsorption process.In addition,0.100 mol/L NaClO solution had the best regeneration effect for the modified zeolite,with the regeneration rate as high as 94.5%,and the regenerated NH_(4)^(+)was converted into non-toxic and harmless N_(2),which realized the prospects of high-efficiency and sustainable regeneration of zeolite without secondary pollution.

关 键 词：煤化工废水 沸石 NH_(4)^(+) 改性 吸附 再生 

分 类 号：X703[环境科学与工程—环境工程]