油菜秆热解过程中重金属形态研究  

Morphology of heavy metals in process of pyrolysis of rape stalk

作　　者：朱明伟 蒋绍坚[1] 付国富[1] 蔡攀[1] 王凯 王浩[1] ZHU Mingwei;JIANG Shaojian;FU Guofu;CAI Pan;WANG Kai;WANG Hao(School of Energy and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学能源科学与工程学院

出　　处：《中南大学学报（自然科学版）》2019年第9期2304-2309,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(21577176)~~

摘　　要：采用BCR连续提取法研究修复植物油菜秆和生物炭中重金属形态,并利用风险评估指数对重金属的环境污染风险进行评估。研究结果表明:随热解温度的升高,各重金属残渣态质量分数增大,Cd,Cu,Mn和Pb的稳定性增强,生物有效性降低,而Zn由于酸溶态质量分数增大,稳定性减弱;随热解时间的延长,Cd和Cu的可氧化态质量分数减小,残渣态质量分数增大,Zn的可还原态质量分数减小,可氧化态与残渣态总质量分数增大,Mn和Pb的各形态质量分数保持相对稳定;热解可有效降低重金属的污染风险。BCR sequential extraction was performed to analyze the morphology of heavy metals(HMs)in rape straw and biochar prepared under different pyrolysis temperature and time,and the environmental potential risk of HMs was evaluated by risk assessment code.The results show that a significant portion of HMs is embodied in the residue with the rising temperature,and the stability of Cd,Cu,Mn and Pb is enhanced,which indicates lower bioavailability.However,with the increase of temperature,the stability of Zn is weakened due to the increase of acid soluble fraction.With the prolongation of pyrolysis time,the proportion of oxidizable fraction of Cd and Cu decreases,while residual fraction increases.The percentage of reducible fraction of Zn decreases,but the total percentages of oxidizable and residual fraction increase.However,there was no remarkable change in the speciation of Mn and Pb.According to risk assessment code,the environmental potential risk of HMs is markedly mitigated.

关 键 词：修复植物 热解 重金属形态 生物有效性 

分 类 号：TK6[动力工程及工程热物理—生物能]