STABILIZATION REMEDIATION OF Cd-POLLUTED SOILS USING ATTALPULGITE

REN Jun; WANG Yirong; REN Hanru; TONG Yunlong; WANG Tongyu; TAO Ling

doi:DOI:10.13205/j.hjgc.202207018

Volume 40 Issue 7

Sep. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(7): 123-131

LV Shuangru, JIN Yanjun, LIU Guotao, REN Fumin, XI Chenggang, LU Tong, ZHU Jintong, ZHANG Chao. CHARACTERISTICS OF RESIDENTIAL DECORATION WASTE GENERATION AND MANAGEMENT COUNTERMEASURES:A CASE STUDY ON OLD PALACE AREA IN DAXING DISTRICT,BEIJING[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(7): 186-192. doi: DOI:10.13205/j.hjgc.202207027

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REN Jun, WANG Yirong, REN Hanru, TONG Yunlong, WANG Tongyu, TAO Ling. STABILIZATION REMEDIATION OF Cd-POLLUTED SOILS USING ATTALPULGITE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(7): 123-131. doi: DOI:10.13205/j.hjgc.202207018

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STABILIZATION REMEDIATION OF Cd-POLLUTED SOILS USING ATTALPULGITE

doi: DOI:10.13205/j.hjgc.202207018

REN Jun^{1,2,3
,
,},
WANG Yirong^1,2,
REN Hanru^1,2,
TONG Yunlong^1,2,
WANG Tongyu⁴,
TAO Ling^1,2,3

1. Key laboratory of Yellow River Water Environment in Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China;
2. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Institute of Environmental Ecology, Lanzhou 730070, China;
3. Gansu Hanxing Environmental Protection Co., Ltd, Lanzhou 730070, China;
4. College of Atmospheric Sciences, Lanzhou University, Lanzhou 730070, China

Received Date: 2021-10-09
Available Online: 2022-09-02

Abstract

Abstract

Cadium in soil has the characteristics of difficult degradation,easy migration accumulation,and is easily to cause damage to the soil environment and threatens food security.Five kinds of new stabilization materials were prepared by loading poly-aluminum ferric chloride on attapulgite.Scanning electron microscope (SEM) characterization,stabilization experiment and corn pot experiment were conducted to evaluate the stabilization effect and environmental risk of Cd in contaminated soil.The results showed that the concentrations of diethylenetriamine pentaacetic acid extracted Cd (DTPA),and toxic characteristic leached Cd (TCLP) were significantly reduced after the application of attapulgite modified with poly-aluminum ferric chloride.In the soil treated with attapulgite modified with a 25% mass ratio of poly-aluminum ferric chloride,the two bioavailable Cd concentrations decreased by 21.51% and 29.3%,respectively.The application of modified attapulgite promoted the growth of corn,and the treatment effect of modified attapulgite with 25% poly-aluminum ferric chloride was the best.In comparison to the control group,the shoot length of corn increased by 52.2%,and the fresh biomass of shoot and root increased by 75.1% and 64.5% respectively.Meanwhile,the dry biomass of shoot and root increased by 80.5% and 79.7% compared with CK.Furthermore,the content of Cd accumulated in the shoot and root of corn decreased by 43.4% and 24.7%,respectively.Attapulgite modified by poly-aluminum ferric chloride has larger specific surface area,higher ion exchange capacity and surface complexation properties,which greatly reduced the bioavailability of heavy metals in soil,so it could be used in stabilization remediation of Cd contaminated farmland soils.
- attapulgite,
- stabilization remediation,
- heavy metal pollution,
- ecological risk,
- soil

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References

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