摘要
以污泥为原料,硫酸钙为添加剂,采用热解法制备了硫酸钙/污泥基生物炭,考察了硫酸钙添加量、热解温度、升温速率及保温时间对生物炭中Pb、Ni形态分布的影响,并利用生态风险评价指数(RAC)对优化热解条件下制备的硫酸钙/污泥基生物炭中的Pb、Ni进行了生态风险评价。结果显示,优化热解条件为:硫酸钙添加量2.5%(质量分数)、热解温度750℃、升温速率2℃/min、保温时间15min。该优化热解条件下制备的硫酸钙/污泥基生物炭中的重金属Pb、Ni的生态风险分别为无风险、低风险,相对于污泥(低风险、中等风险)明显降低。
The calcium sulphate/sludge based biochar was prepared by pyrolysis using sludge as raw material and calcium sulphate as additive.The effects of calcium sulphate addition,pyrolysis temperature,heating rate and holding time on speciation distribution of Pb and Ni in biochar were investigated.The ecological risk assessment of Pb and Ni in calcium sulphate/sludge based biochar under optimal pyrolysis conditions was carried out by ecological risk assessment index(RAC).Results showed the optimal pyrolysis conditions were:calcium sulphate addition 2.5%(mass fraction),pyrolysis temperature 750 ℃,heating rate 2 ℃/min,and holding time 15 min.In addition,the ecological risks of Pb and Ni in the calcium sulphate/sludge based biochar prepared under the optimal pyrolysis conditions were no risk and low risk,respectively,which were obviously lower compared with sludge(low risk and medium risk).
作者
黄蓉
刘立恒
何东薇
汤传武
HUANG Rong;LIU Liheng;HE Dongwei;TANG Chuanwu(College of Environmental Science and Engineering,Guilin University of Technology,Guilin Guangxi 541004;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin Guangxi 541004;Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,Guilin University of Technology,Guilin Guangxi 541004)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2020年第7期849-853,共5页
Environmental Pollution & Control
基金
国家自然科学基金重点项目(No.51638006)
广西高等学校高水平创新团队及卓越学者计划项目(No.002401013001)
广西矿冶与环境科学实验中心项目(No.KH2012ZD004)
广西“八桂学者”项目。
关键词
硫酸钙/污泥基生物炭
热解条件
重金属
形态分布
生态风险
calcium sulphate/sludge based biochar
pyrolysis conditions
heavy metals
speciation distribution
ecological risk
作者简介
第一作者:黄蓉,女,1995年生,硕士研究生,主要从事固体废弃物资源化利用研究;通讯作者:刘立恒。
