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Co-pyrolysis of corn stover with industrial coal ash for in situ efficient remediation of heavy metals in multi-polluted soil
Xia, Yu; Li, Yi; Sun, Yuting; Miao, Wei; Liu, Zhengang
2021-11-15
Source PublicationENVIRONMENTAL POLLUTION
ISSN0269-7491
Volume289Pages:-
AbstractCoal ash incorporated biochar (CA/BC) composite was prepared by co-pyrolysis of agricultural residue and in-dustrial coal ash and applied for remediation of soils polluted by lead (Pb) and cadmium (Cd). The results showed that immobilization efficiency of CA/BC for heavy metals (HMs) was significantly enhanced by 77.1 % (Pb) and 42.7 % (Cd) compared to pristine biochar (BC), and this was mainly due to the increased pH value, surface functionality and surface negative charge. By the introduction of 5 % CA/BC, the polluted soils showed the highest reduction of leaching toxicity by 67.9 % (Pb) and 49.7 % (Cd), respectively. The chemical speciation of Pb and Cd in soils was changed remarkably and the reduced bioavailable Pb and Cd were mainly transformed from acid-soluble fraction into the most stable form of residual fraction. The mechanism study showed that surface precipitation, complexation, cation exchange and cation-pi interaction of CA/BC mainly contributed to heavy metals (HMs) immobilization. The pot experiments further confirmed that incorporation of 5 % CA/BC effectively reduced plant Pb and Cd accumulation by 81 % and 62.5 % respectively, and significantly promoted the plant growth of paddy rice by 3.1, 2.2 and 2.0 times in terms of root, stem length and dry mass parameters. The present study offered a cost-effective and green method to prepare soil amendment with great potential for remediation of soils polluted by HMs and realized the value-added utilization of waste agricultural residue and industrial coal ash.
Department固体废弃物处理与资源化实验室
KeywordCoal ash Waste biomass Polluted soil Soil remediation Paddy rice
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/46782
Collection固体废弃物处理与资源化实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Dept Solid Waste Treatment & Recycling, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.China Urban Construct Design & Res Inst Co Ltd, Beijing 100120, Peoples R China
4.Chinese Acad Sci, Inst Proc Engn IPE, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
5.Beijing Univ Chem Technol, Coll Life Sci & Technol, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Xia, Yu,Li, Yi,Sun, Yuting,et al. Co-pyrolysis of corn stover with industrial coal ash for in situ efficient remediation of heavy metals in multi-polluted soil[J]. ENVIRONMENTAL POLLUTION,2021,289:-.
APA Xia, Yu,Li, Yi,Sun, Yuting,Miao, Wei,&Liu, Zhengang.(2021).Co-pyrolysis of corn stover with industrial coal ash for in situ efficient remediation of heavy metals in multi-polluted soil.ENVIRONMENTAL POLLUTION,289,-.
MLA Xia, Yu,et al."Co-pyrolysis of corn stover with industrial coal ash for in situ efficient remediation of heavy metals in multi-polluted soil".ENVIRONMENTAL POLLUTION 289(2021):-.
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