摘要
市政污泥产量巨大,其高效资源化利用日益受到关注。该研究以市政污泥为原料,采用KHCO3活化热解制备了分级多孔生物炭(PSB),将其协同过一硫酸盐(PMS)高效去除高浓度4-氯酚(4-CP),考察了不同热解温度、制备工艺、PMS投加量等因素对PSB协同PMS对500 mg/L 4-CP去除效果的影响,并对其去除机理进行了探究。结果表明,900℃制备的生物炭PSB-900比表面积达1476 m^(2)/g,对4-CP吸附能力最强,去除率为65%,吸附平衡后加入PMS,在较低的PMS投加量(PMS∶4-CP(摩尔比)=2)下,可在30 min内实现4-CP的100%去除。在PSB-900/PMS催化降解体系中,电子传递起主导作用,热解温度的升高增强了生物炭的导电性。此外,超氧阴离子自由基和羟基自由基也在催化降解4-CP的过程中起到一定作用。研究结果为污泥基分级多孔生物炭的制备和废水中高浓度有机污染物的高效快速去除提供了新的思路。
Municipal wastewater treatment plants(WWTPs)discharge huge amount of sludge,which has drawn increasing attention about its effective resource utilization.In this study,municipal sludge samples collected from a WWTP were used as raw materials to prepare the hierarchically porous biochar(PSB)by KHCO3-activated pyrolysis,which was used combining with persulfate(PMS)to efficiently remove high concentrated 4-chlorophenol(4-CP)of the PSB,and as 4-CP concentration was 500 mg/L,the influence of parameters including pyrolysis temperature,different preparation processes,and PMS dosage on the removal effect was investigated,the mechanism explored.The investigation shows that the biochar PSB-900(prepared at 900℃)has a specific surface area of 1476 m^(2)/g,with the highest adsorption capacity of 4-CP,and a removal rate of 65%;when adding PMS after the adsorption has reached equilibrium,4-CP removal could still achieve 100%even in the case of low dose of PMS(PMS∶4-CP(molar ratio)=2)within 30 min.As for the mechanism,in the biochar PSB-900 system,electron transfer plays a leading role,and a increase of pyrolysis temperature can enhance the conductivity of biochar;in addition,super-oxide anion and hydroxyl radicals also plays a certain role in the catalytic degradation of 4-CP.It is expected that this research achievement could provide a new idea in terms of sludge resource utilization such as preparation of hierarchically porous biochar and the efficient and rapid removal of high concentration of organic pollutants from wastewater.
作者
裘晶晶
李新瑞
邹正康
梁莎
虞文波
段华波
杨家宽
QIU Jingjing;LI Xinrui;ZOU Zhengkang;LIANG Sha;YU Wenbo;DUAN Huabo;YANG Jiakuan(Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin,School of Environmental Science&Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Hubei Provincial Engineering Laboratory for Disposal and Recycling Technology of Solid Waste,Wuhan 430074,China;State Key Laboratory of Coal Combustion,Wuhan 430074,China)
出处
《环境科学与技术》
北大核心
2025年第8期10-18,共9页
Environmental Science & Technology
基金
国家自然科学基金面上项目(52070084)。
关键词
污泥热解
分级多孔生物炭
4-氯苯酚
催化降解
sludge pyrolysis
pyrolyzed porous biochar
4-chlorophenol
catalytic degradation
