骨炭粉对Cd污染农田的修复效果与稳定性评价

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Abstract To investigate the remediation effect and its sustainability of bone charcoal on Cd polluted soil, this paper studied the remediation effect of bone charcoal application (0.25%, 0.50% and 1.0%) on Cd polluted soils, i.e. the fluvo-aquatic soil in Henan province and red earth in Hunan province, the phytoavailability of Cd in soil, the decreasing rate of Cd in crops (DR,%) and inactivation rate (IR,%) of Cd reducing defined as comparison with the first season crop, etc were used to evaluate the remediation efficiency and its sustainability after 120d and 360d application under field conditions. all bone charcoal applications could effectively promote the growth of crops and increase the yield of crops in tested soils. The application of bone charcoal improved the pH value, CEC, total P and available P content in soils to various degrees. Among the treatments, the bone charcoal application with 0.5% and 1.0% (w/w) significantly (P<0.05) improved the pH value, total P and available P content in soils when compared with the control groups. The content of available Cd as extracted with DPTA-CaCl₂-TEA in fluvo-aquatic soil and red earth decreased by 32.1%~48.4% and 32.8%~56.2% respectively after 120d of bone charcoal application treatments. The content of DPTA-CaCl₂-TEA-Cd in the soils was still significantly lower than that of the control groups after 360d, with a decrease of 26.9%~37.8% and 25.8%~39.5%, respectively. The uptake of Cd by three-season rotation crops showed that, as compared with the controls, the decreasing rate (DR,%) of Cd uptake by first season crop treated with different application levels (0.25%~1.0%) of bone charcoal ranged from 36.0% to 60.4% for fluvo-aquatic soil and 33.9% to 58.2% for red earth, respectively, the decreasing rate (DR,%) of Cd increased with the application level of bone charcoal. The inactivation rate (IR,%) of Cd was used to evaluate the sustainability of remediation efficiency in this study, the result indicated that the IRs of Cd for the third season crop ranged from 21.2%~34.7% in fluvo-aquatic soil and 6.2% to 21.6% in red earth, respectively, which indicated that the sustainability of remediation efficiency for acidic red earth was better than that in fluvo-aquatic soil. Taking into account all these factors of remediation effect and the sustainability of remediation efficiency, bone charcoal could be potentially used in the remediation of Cd polluted soil.

Key words： bone charcoal crops Cd remediation effect sustainability assessment

Received: 03 February 2020

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	SUN Xiao-yi
	WANG Dan
	WANG Meng
	ZHENG Can
	CHEN Shi-bao

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SUN Xiao-yi,WANG Dan,WANG Meng等. Remediation effect of bone charcoal on Cd polluted soil and its sustainability assessment under field condition[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4449-4456.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I10/4449

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