矿业科学学报2024，Vol.9Issue(2)：167-177,11.DOI:10.19606/j.cnki.jmst.2024.02.004
煤炭地下气化渗透反应墙构建材料的吸附和渗流特性研究
Adsorption and seepage properties of permeable reaction barrier construction materials for underground coal gasification
摘要
Abstract
Groundwater pollution induced by Underground Coal Gasification(UCG)seriously hinders its development.Permeable Reactive Barrier(PRB)remediation therefore stands out as a major research fo-cus for in-situ groundwater remediation,where the characteristics of PRB material is crucial to their ef-fective operation.This study thus examines the adsorption properties of sand,organic bentonite,and acti-vated carbon on phenol,a characteristic organic pollutant associated with UCG.A self-constructed per-meation experimental system is employed to study the adsorption and permeation characteristics of sand,organic bentonite,activated carbon,mixtures of sand and organic bentonite,as well as sand and activated carbon to investigate their comprehensive impact in purifying contaminated water.The results indicate that:①Organic bentonite exhibits a rapid adsorption rate for phenol in solution,reaching ad-sorption equilibrium within 10 minutes,despite a relatively low adsorption capacity(1.98 mg/g).Acti-vated carbon,on the other hand,demonstrates a slower adsorption rate yet a higher adsorption capacity(2.22 mg/g).②The adsorption of phenol by organic bentonite conforms to the Freundlich isotherm model,with parameters kF = 0.040 and n = 1.207.Activated carbon follows the Langmuir isotherm model,with parameters Smax = 2.44 mg/g and kL = 0.125 L/mg.③The permeability coefficients of sand and activated carbon are 1.006×10-3 m/s and 4.761×10-2 m/s,respectively.The mixture of sand with activated carbon or organic bentonite could effectively moderate the permeability of the mixed ma-terial.When the mass ratio of sand to organic bentonite increases from 1 ∶ 1 to 3 ∶ 1,the permeability coefficient of the mixed material increases from 2.624×10-6 to 3.468×10-5 m/s.Conversely,when the ratio of sand to activated carbon increases from 1 ∶ 1 to 3 ∶ 1,the permeability coefficient of the mixed material decreases from 1.379×10-3 to 1.301×10-4 m/s.关键词
煤炭地下气化/污染地下水/渗透反应墙/渗流/等温吸附Key words
underground coal gasification/contaminated groundwater/permeable reaction barrier/seep-age/isothermal adsorption分类
矿业与冶金引用本文复制引用
王凡,徐冰,谌伦建,邢宝林,苏发强..煤炭地下气化渗透反应墙构建材料的吸附和渗流特性研究[J].矿业科学学报,2024,9(2):167-177,11.基金项目
国家自然科学基金-新疆联合基金(U1803114) （U1803114）
河南省自然科学基金(232300421335) （232300421335）
河南省科技攻关项目(212102311069) （212102311069）
河南省博士后科研项目(HN2022021) （HN2022021）
