铁基生物炭对汞污染土壤微波热脱附效果的影响  

Effect of iron-based biochar on microwave thermal desorption of mercury-contaminated soil

作　　者：刘煜欣 林亲铁 郑君里 范馨丹 何金 王铭剑 LIU Yuxin;LIN Qintie;ZHENG Junli;FAN Xindan;HE Jin;WANG Mingjian(Guangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research Centre,School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006,China;School of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China)

机构地区：[1]广东工业大学环境科学与工程学院广东省工业污染场地修复技术与装备工程技术研究中心,广东广州510006 [2]中南大学化学化工学院,湖南长沙410083

出　　处：《化工环保》2023年第2期206-214,共9页Environmental Protection of Chemical Industry

基　　金：国家重点研发计划项目(2018YFC1802803);广州市科技计划项目(202206010057,202103000018)。

摘　　要：以某矿山汞污染土壤(土壤含水率4.2%,汞含量145.5 mg/kg)为研究对象,以铁基生物炭为吸波材料,强化微波修复汞污染土壤。实验结果表明,在铁基生物炭添加量(w)为8%、热脱附温度为180℃、热脱附时间为120 min的条件下,汞去除率可达91.10%。相比于单一微波修复(汞去除率仅为30.12%),向土壤中添加生物炭材料可有效提高微波的加热效果,且铁基生物炭的吸波能力优于原始生物炭。微波热脱附过程中,其他形态的汞有向硝酸溶态汞转化的趋势。土壤添加铁基生物炭并经微波处理后,粒度和pH略有降低,有机质和氮、磷、钾含量均有所提升。Taking the mercury-contaminated soil of a mine(soil moisture content 4.2%,mercury content 145.5 mg/kg)as the research object,iron-based biochar(Fe@BC)was used as a wave-absorbing material to enhance microwave remediation of mercury-contaminated soil.The experimental results show that the removal rate of mercury can reach 91.10%under the conditions of Fe@BC addition amount(w)8%,thermal desorption temperature 180℃and thermal desorption time 120 min.Compared with the single microwave remediation(removal rate of mercury is only 30.12%),the addition of biochar to the soil can effectively improve the heating effect of microwave,and the wave-absorbing ability of iron-based biochar is better than that of the original biochar.During the process of microwave thermal desorption,there is a tendency for mercury in various forms to convert to the nitrate soluble mercury.The addition of iron-based biochar and microwave treatment of the soil result in a slight decrease of soil particle size and pH,and an increase of organic matter and nitrogen,phosphorus and potassium content.

关 键 词：土壤修复 热脱附 微波 汞 铁基生物炭 

分 类 号：X53[环境科学与工程—环境工程]