环境工程学报2017，Vol.11Issue(12)：6504-6510,7.DOI:10.12030./j.cjee.201703050
热解条件对茶叶渣生物炭特性及镉污染土壤钝化效果的影响
Influence of pyrolysis conditions on properties of tea residue biochar and its passivation effect in Cd contaminated soil
摘要
Abstract
In order to study the effects of pyrolysis conditions on properties of tea residue biochar(TSBC) and its passivation effect of Cd-contaminated soil,TSBC derived from tea residues were produced under different pyrolysis temperatures (300,400,500 and 600℃) and pyrolysis times (one hour and two hours),respectively.The results showed the pyrolysis temperature increased with pH and surface area of TSBC,but decreased with its production,electrical conductivity and the number of surface functional groups.The weak alkaline,large surface area and strong stability of TSBC revealed the amendment and adsorption potential to acid soil improvement and heavy metals sorption.However,the effects of pyrolysis time on biochar properties were not significant.Compared with the control group,addition of TSBC significantly increased the soil pH,organic carbon (SOC) and dissolved organic carbon(DOC).But the increasing extent of SOC and DOC in Cd-contaminated soil reduced with the increase of pyrolysis temperature.Adding TSBC could decrease the proportion of exchangeable fraction of Cd.The proportion of exchangeable fraction of Cd reduced by 25.56％ at pyrolysis temperature 500 to 600 ℃,which significantly higher than other pyrolysis temperature.The TSBC has the better effects to immobilize Cd in Cd-contaminated soil.The results provide theoretical basis for remediation of heavy metals contaminated soil and resource utilization of domestic waste.关键词
茶叶渣/生物炭/热解/土壤pH/SOC/DOC/镉形态Key words
tea residue/biochar/pyrolysis/soil pH/SOC/DOC/cadmium fractions分类
资源环境引用本文复制引用
李长欣,吕严凤,张梦迪,蒋容,冯映黎,杨占彪..热解条件对茶叶渣生物炭特性及镉污染土壤钝化效果的影响[J].环境工程学报,2017,11(12):6504-6510,7.基金项目
国家自然科学基金资助项目(21507095) （21507095）
四川农业大学兴趣性实验项目(20150152) （20150152）
