Feasibility of sludge-based biochar for soil remediation: Characteristics and safety performance of heavy metals influenced by pyrolysis temperatures

Xing, Jia; Li, Lucheng; Li, Guibai; Xu, Guoren

doi:10.1016/j.ecoenv.2019.05.034

Cited by 67 publications

(23 citation statements)

References 49 publications

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“…Similarly, Tang et al, found that rice straw biochar application was effective at improving soil pH and SOM, leading to decreased Cd availability and subsequent increases in soil enzymatic activity [61]. Xing et al, showed that a sludge-based biochar increased the ratio of immobilized soil heavy metals, which positively correlated to the presence of V. fischeri, the growth of wheat, and the activities of other soil microbes [39]. and Pb concentrations in crops, were also observed in PC1.…”

Section: The Influence Of Biochar On Soil and Plant Characteristics Imentioning

confidence: 99%

“…Wang et al [37] and Liu et al [38] both observed similar responses when using wheat straw or coconut shell biochar, respectively, to reduce Cd bioavailability. Sludge-based biochars have also been shown to decrease Pb and Cd bioavailability from 55.9% to 4.9% for Pb, and from 78.2% to 12.5% for Cd [39].…”

Section: Biochar Effects On CD and Pb In The Soil Water Soluble Phasementioning

confidence: 99%

“…bioavailability. Sludge-based biochars have also been shown to decrease Pb and Cd bioavailability from 55.9% to 4.9% for Pb, and from 78.2% to 12.5% for Cd [39].…”

Section: Biochar Effects On CD and Pb In The Soil Water Soluble Phasementioning

confidence: 99%

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Short- and Long-Term Biochar Cadmium and Lead Immobilization Mechanisms

Cui

Bian

et al. 2020

Environments

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The mechanisms of soil Cd and Pb alterations and distribution following biochar (BC; 0 to 40 t ha−1) amendments applied (in either 2009 [long-term] or in 2016 [short-term]) to a contaminated rice paddy soil, and subsequent plant Cd and Pb tissue distribution over time was investigated. Water-soluble Cd and Pb concentrations decreased by 6.7–76.0% (short-term) and 10.3–88.1% (long-term) with biochar application compared to the control. The soil exchangeable metal fractions (i.e., considered more available) decreased, and the residual metal fractions (i.e., considered less available) increased with short- and long-term biochar amendments, the latter likely a function of biochar increasing pH and forcing Cd and Pb to form crystal mineral lattice associations. Biochar application reduced Cd (16.1–84.1%) and Pb (4.1–40.0%) transfer from root to rice grain, with rice Cd and Pb concentrations lowered to nearly Chinese national food safety standards. Concomitantly, soil organic matter (SOM), pH and soil water content increased by 3.9–49.3%, 0.05–0.35 pH units, and 3.8–77.4%, respectively, with increasing biochar application rate. Following biochar applications, soil microbial diversity (Shannon index) also increased (0.8–46.2%) and soil enzymatic activities were enhanced. Biochar appears to play a pivotal role in forcing Cd and Pb sequestration in contaminated paddy soils, reducing heavy metal transfer to rice grain, and potentially leading to reduced heavy metal consumption by humans.

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Section: The Influence Of Biochar On Soil and Plant Characteristics Imentioning

confidence: 99%

Section: Biochar Effects On CD and Pb In The Soil Water Soluble Phasementioning

confidence: 99%

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Short- and Long-Term Biochar Cadmium and Lead Immobilization Mechanisms

Cui

Bian

et al. 2020

Environments

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“…The adsorption of Cu 2+ could be successfully controlled through temperature fluctuations within 20-60°C, and the maximum adsorption capacity for Cu 2+ recovery was 0.13 mmol/g. Xing, Lia, Li, and Xu (2019) used sludge-based biochars (SBB) produced within 300-900°C to adsorb the heavy metals. The bioavailable fractions of copper, arsenic, lead, and chromium greatly dropped from 91.65%, 97.91%, 55.91%, 73.51% to 9.44%, 52.11%, 4.87%, and 9.57%, respectively, when the sludge was pyrolyzed to form the biochar at 900°C.…”

Section: Heavy Metal Removal and Immobilizationmentioning

confidence: 99%

“…Xing, Lia, Li, and Xu (2019) used sludge‐based biochars (SBB) produced within 300–900°C to adsorb the heavy metals. The bioavailable fractions of copper, arsenic, lead, and chromium greatly dropped from 91.65%, 97.91%, 55.91%, 73.51% to 9.44%, 52.11%, 4.87%, and 9.57%, respectively, when the sludge was pyrolyzed to form the biochar at 900°C.…”

Section: Heavy Metal Removal and Immobilizationmentioning

confidence: 99%