Chemical and biological immobilization mechanisms of potentially toxic elements in biochar-amended soils

Bandara, Tharanga; Franks, Ashley E.; Xu, Jianming; Bolan, Nanthi; Wang, Hailong; Tang, Caixian

doi:10.1080/10643389.2019.1642832

Cited by 192 publications

(93 citation statements)

References 325 publications

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“…The manuscript entitled "Characterization and adsorption capacity of modified 3D porous aerogel from grapefruit peels for removal of oils and organic solvents" (Imran et al 2020) synthesized a hydrophobic aerogel with three-dimensional (3D) structure from grapefruit peel by hydrothermal approach and used the porous aerogel as an adsorbent for removal of oils and organic solvents from polluted water. The findings of these studies benefit the agricultural waste recycling utilization and the contaminated water and soil remediation, as reported in many other studies (e.g., Bandara et al 2020;Lehmann 2019;Lu et al 2020;Wu et al 2020).…”

supporting

confidence: 74%

Special issue on sustainable waste treatment and management

Zhang

Awasthi

et al. 2020

Environ Sci Pollut Res

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supporting

confidence: 74%

Special issue on sustainable waste treatment and management

Zhang

Awasthi

et al. 2020

Environ Sci Pollut Res

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“…The other possible mechanism for the reduction of cadmium uptake in Brassica carinata is commonly determined by cadmium mobility in soil, in turn, extremely relied on soil pH, AP, and CEC. Since, some indirect immobilization mechanisms, such as the enhancement of soil pH and cation exchange capacity due to the application the biochar, could also promote immobilization of toxic metals in soil ( Bandara et al., 2019 ). Moreover, the reduction in cadmium amount in shoot may also be associated with the accumulation of the cadmium in the root of Brassica carinata .…”

Section: Resultsmentioning

confidence: 99%

The effect of brewery sludge biochar on immobilization of bio-available cadmium and growth of Brassica carinata

Tsadik

Hailu

Leta

et al. 2020

Heliyon

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Biochar has gained an attention in reducing the bio-availability of toxic heavy metals and minimize threat of entering into food chain from contaminated soil. This study was aimed at evaluating the potential use of brewery sludge biochar (BSB) as a soil amendment for reducing cadmium bio-availability and uptake by Brassica carinata in a pot experiment. In this pot experiment, artificially cadmium spiked, moderately fertile, and slightly basic silty-loam soil was used. The biochar was produced by pyrolyzing of the brewery sludge at 500 °C. The obtained biochar was sieved with 0.5 mm mesh size and applied at the rate of 4 % (w/w) on the Brassica carinata grown cadmium spiked soil. The additions of BSB to the soil contributed a significant reduction of the bio-availability of cadmium in the soil and its accumulation in the shoot of Brassica carinata by 86% and 93%, respectively. Besides, it remarkably increased the dry weight of the edible part of Brassica carinata by 228% . The results revealed that BSB is very effective additive in cadmium immobilization, in turn, significantly (p-value = 0.00) promoting vegetable ( Brassica carinata ) growth. Therefore, BSB can be used as agricultural soil remedy for cadmium contamination and as safe disposal of brewery sludge.

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“…Soil enzyme activities are key indicators of ecological change, and are particularly sensitive to anthropogenic modifications of heavy metal contaminated soils. Enzymatic activity alterations, due to soil amendment applications, are directly expressed in strength of biochemical reactions and their associated implications within soils [50]. In particular, soil oxidoreductase enzymatic activities are sensitive to change, and include alkaline phosphatase, dehydrogenase, urease and sucrase enzymatic activities.…”

Section: Biochar Effects On Soil Enzyme Activity and Microbial Diversitymentioning

confidence: 99%

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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Chemical and biological immobilization mechanisms of potentially toxic elements in biochar-amended soils

Cited by 192 publications

References 325 publications

Special issue on sustainable waste treatment and management

Special issue on sustainable waste treatment and management

The effect of brewery sludge biochar on immobilization of bio-available cadmium and growth of Brassica carinata

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

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