Effects of Zn in sludge-derived biochar on Cd immobilization and biological uptake by lettuce

Jia Gao; Tuokun Zhao; Daniel C.W. Tsang; Nan Zhao; Hang Wei; Mingyu Feng; Kunyuan Liu; Weihua Zhang; Rongliang Qiu

doi:10.1016/j.scitotenv.2020.136721

Effects of Zn in sludge-derived biochar on Cd immobilization and biological uptake by lettuce

Jia Gao, Tuokun Zhao, Daniel C.W. Tsang, Nan Zhao, Hang Wei, Mingyu Feng, Kunyuan Liu, Weihua Zhang, Rongliang Qiu

Research output: Journal article publication › Journal article › Academic research › peer-review

14 Citations (Scopus)

Abstract

Considering the high Zn content of municipal sewage sludge and its competition with Cd during plant uptake due to their similar properties, the presence of Zn in sludge-derived biochar (SDBC) may affect Cd immobilization and uptake by plants. To confirm this, SDBC samples with different Zn contents were prepared and characterized. Their Cd immobilization behavior was studied by conducting batch sorption experiments, and their effects on Cd uptake by lettuce were explored by conducting hydroponic experiments. The results reveal that some Zn contained in the sewage sludge was transformed into ZnO during pyrolysis. The Brunauer-Emmett-Teller (BET) surface area of the SDBC samples containing 2324 mg kg⁻ ¹ Zn (BC-2324) was 18.3 m² g⁻¹, which was 132% larger than that of the samples containing 1438 mg kg⁻ ¹ Zn (BC-1438). The SDBC samples containing 1901 mg kg⁻ ¹ (BC-1901) exhibited the highest Langmuir sorption capacity of 3476 mg kg⁻ ¹, which is 115% higher than that of SB-1438. Furthermore, the lettuce remedied with SB-1901 exhibited 44% more biomass; lower peroxidase, catalase, and malondialdehyde activity; and 18.4% less Cd in the leaves of the lettuce than the lettuce remedied with BC-1438, suggesting the potential benefits of using Zn-rich SDBC for soil amendment.

Original language	English
Article number	136721
Journal	Science of the Total Environment
Volume	714
DOIs	https://doi.org/10.1016/j.scitotenv.2020.136721
Publication status	Published - 20 Apr 2020

Keywords

Cd uptake by lettuce
Farmland soil amendment
Metal immobilization
Potentially toxic elements
Sludge-derived biochar
Sustainable remediation

ASJC Scopus subject areas

Environmental Engineering
Environmental Chemistry
Waste Management and Disposal
Pollution

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10.1016/j.scitotenv.2020.136721

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title = "Effects of Zn in sludge-derived biochar on Cd immobilization and biological uptake by lettuce",

abstract = "Considering the high Zn content of municipal sewage sludge and its competition with Cd during plant uptake due to their similar properties, the presence of Zn in sludge-derived biochar (SDBC) may affect Cd immobilization and uptake by plants. To confirm this, SDBC samples with different Zn contents were prepared and characterized. Their Cd immobilization behavior was studied by conducting batch sorption experiments, and their effects on Cd uptake by lettuce were explored by conducting hydroponic experiments. The results reveal that some Zn contained in the sewage sludge was transformed into ZnO during pyrolysis. The Brunauer-Emmett-Teller (BET) surface area of the SDBC samples containing 2324 mg kg− 1 Zn (BC-2324) was 18.3 m2 g−1, which was 132% larger than that of the samples containing 1438 mg kg− 1 Zn (BC-1438). The SDBC samples containing 1901 mg kg− 1 (BC-1901) exhibited the highest Langmuir sorption capacity of 3476 mg kg− 1, which is 115% higher than that of SB-1438. Furthermore, the lettuce remedied with SB-1901 exhibited 44% more biomass; lower peroxidase, catalase, and malondialdehyde activity; and 18.4% less Cd in the leaves of the lettuce than the lettuce remedied with BC-1438, suggesting the potential benefits of using Zn-rich SDBC for soil amendment.",

keywords = "Cd uptake by lettuce, Farmland soil amendment, Metal immobilization, Potentially toxic elements, Sludge-derived biochar, Sustainable remediation",

author = "Jia Gao and Tuokun Zhao and Tsang, {Daniel C.W.} and Nan Zhao and Hang Wei and Mingyu Feng and Kunyuan Liu and Weihua Zhang and Rongliang Qiu",

year = "2020",

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doi = "10.1016/j.scitotenv.2020.136721",

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journal = "Science of the Total Environment",

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T1 - Effects of Zn in sludge-derived biochar on Cd immobilization and biological uptake by lettuce

AU - Gao, Jia

AU - Zhao, Tuokun

AU - Tsang, Daniel C.W.

AU - Zhao, Nan

AU - Wei, Hang

AU - Feng, Mingyu

AU - Liu, Kunyuan

AU - Zhang, Weihua

AU - Qiu, Rongliang

PY - 2020/4/20

Y1 - 2020/4/20

N2 - Considering the high Zn content of municipal sewage sludge and its competition with Cd during plant uptake due to their similar properties, the presence of Zn in sludge-derived biochar (SDBC) may affect Cd immobilization and uptake by plants. To confirm this, SDBC samples with different Zn contents were prepared and characterized. Their Cd immobilization behavior was studied by conducting batch sorption experiments, and their effects on Cd uptake by lettuce were explored by conducting hydroponic experiments. The results reveal that some Zn contained in the sewage sludge was transformed into ZnO during pyrolysis. The Brunauer-Emmett-Teller (BET) surface area of the SDBC samples containing 2324 mg kg− 1 Zn (BC-2324) was 18.3 m2 g−1, which was 132% larger than that of the samples containing 1438 mg kg− 1 Zn (BC-1438). The SDBC samples containing 1901 mg kg− 1 (BC-1901) exhibited the highest Langmuir sorption capacity of 3476 mg kg− 1, which is 115% higher than that of SB-1438. Furthermore, the lettuce remedied with SB-1901 exhibited 44% more biomass; lower peroxidase, catalase, and malondialdehyde activity; and 18.4% less Cd in the leaves of the lettuce than the lettuce remedied with BC-1438, suggesting the potential benefits of using Zn-rich SDBC for soil amendment.

AB - Considering the high Zn content of municipal sewage sludge and its competition with Cd during plant uptake due to their similar properties, the presence of Zn in sludge-derived biochar (SDBC) may affect Cd immobilization and uptake by plants. To confirm this, SDBC samples with different Zn contents were prepared and characterized. Their Cd immobilization behavior was studied by conducting batch sorption experiments, and their effects on Cd uptake by lettuce were explored by conducting hydroponic experiments. The results reveal that some Zn contained in the sewage sludge was transformed into ZnO during pyrolysis. The Brunauer-Emmett-Teller (BET) surface area of the SDBC samples containing 2324 mg kg− 1 Zn (BC-2324) was 18.3 m2 g−1, which was 132% larger than that of the samples containing 1438 mg kg− 1 Zn (BC-1438). The SDBC samples containing 1901 mg kg− 1 (BC-1901) exhibited the highest Langmuir sorption capacity of 3476 mg kg− 1, which is 115% higher than that of SB-1438. Furthermore, the lettuce remedied with SB-1901 exhibited 44% more biomass; lower peroxidase, catalase, and malondialdehyde activity; and 18.4% less Cd in the leaves of the lettuce than the lettuce remedied with BC-1438, suggesting the potential benefits of using Zn-rich SDBC for soil amendment.

KW - Cd uptake by lettuce

KW - Farmland soil amendment

KW - Metal immobilization

KW - Potentially toxic elements

KW - Sludge-derived biochar

KW - Sustainable remediation

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SN - 0048-9697

VL - 714

JO - Science of the Total Environment

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ER -

Effects of Zn in sludge-derived biochar on Cd immobilization and biological uptake by lettuce

Abstract

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