Preprints
https://doi.org/10.5194/soil-2021-145
https://doi.org/10.5194/soil-2021-145
 
24 Jan 2022
24 Jan 2022
Status: a revised version of this preprint was accepted for the journal SOIL and is expected to appear here in due course.

The cooperative application of oyster shell and biochar efficiently enhanced in-situ remediation of cadmium contaminated soil around intensive industry

Bin Wu1, Jia Li1, Mingping Sheng2, He Peng2, Dinghua Peng2, and Heng Xu2 Bin Wu et al.
  • 1State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution, College of Ecology and Environment, Chengdu University of Technology, Chengdu, 610059, PR China
  • 2Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610065, PR China

Abstract. Biochar has been widely used for the in-situ remediation in the cadmium (Cd) contaminated soil, while the high-cost of biochar limited its application in farmland. In this study, we firstly investigated the possibility of cooperative application of oyster shell and biochar to enhance Cd immobilization efficiency and reduce the cost in field experiments under rice-oilseed rape rotation. Treatments were comprised of: rice planting without amendments (R-PA0); followed with 15000 kg/ha biochar (R-PA1); followed with 15000 kg/ha oyster shell (R-PA2); followed with 7500 kg/ha biochar and 7500 kg/ha oyster shell (R-PA3); rice-oilseed rape rotation without amendments (RT-PA0); rotation with 15000 kg/ha biochar (RT-PA1); rotation with 15000 kg/ha oyster shell (RT-PA2); rotation with 7500 kg/ha biochar and 7500 kg/ha oyster shell (RT-PA3). Results revealed that HOAc-extractable Cd was significantly decreased by 38.46 % in R-PA2. Cd contents in brown rice and oilseed were reduced by 29.67 % in R-PA3 and 19.74 % in RT-PA3 compared with control. Meanwhile, Hazard Quotient of brown rice and oilseed significantly decreased in RT-PA3. The Olsen-P in R-PA3 and RT-PA3 was markedly increased by 187.46 % and 184.73 %, respectively. In addition, activities of urease, catalase, and β-galactosidase in RT-PA3 were significantly increased by 268.88 %, 30.44 % and 245.28 %, respectively. Furthermore, the jiont application of biochar with oyster shell significantly decreased the cost of soil remediation at least 9600 RMB/ha. These results demonstrated that the joint utilization of biochar with oyster shell might be an economical and effective pathway to achieve in-situ remediation of Cd contaminated farmland.

Bin Wu et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on soil-2021-145', Anonymous Referee #1, 07 Feb 2022
    • AC1: 'Reply on RC1', Bin Wu, 29 Mar 2022
  • RC2: 'Comment on soil-2021-145', Anonymous Referee #2, 08 Mar 2022
    • AC2: 'Reply on RC2', Bin Wu, 29 Mar 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on soil-2021-145', Anonymous Referee #1, 07 Feb 2022
    • AC1: 'Reply on RC1', Bin Wu, 29 Mar 2022
  • RC2: 'Comment on soil-2021-145', Anonymous Referee #2, 08 Mar 2022
    • AC2: 'Reply on RC2', Bin Wu, 29 Mar 2022

Bin Wu et al.

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Short summary
Cadmium contaminant in soil has severly threatened human health. In this study, we firstly investigated the possibility of cooperative application of oyster shell and biochar to enhance Cd immobilization efficiency and reduce the cost in field experiments under rice-oilseed rape rotation, which provided an economical and effective pathway to achieve in-situ remediation of Cd contaminated farmland.