Speciation and bioavailability of heavy metals in pyrolytic biochar of swine and goat manures

Zeng, Xinyi; Xiao, Zhihua; Zhang, Guolin; Wang, Andong; Li, Zihan; Liu, Yihan; Wang, Hua; Zeng, Qingru; Liang, Yue; Zhang, Dongsheng

doi:10.1016/j.jaap.2018.03.012

Cited by 158 publications

(31 citation statements)

References 37 publications

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“…3 ). This seemed in agreement with the finding by Zeng et al (2018) that following pyrolysis, metals became increasingly associated with or bound to stable OM and by Wang et al (2016) that pyrolysis enhanced transformation of the mobile and easily available PTEs into relatively stable forms. As already clearly known, organic matter exerted a pivotal role in controlling metal mobility ( Sauve et al, 2000 ) in epigenic environment.…”

Section: Discussionsupporting

confidence: 91%

“…Following pyrolysis, the environmental risk by individual PTEs was reduced by 1-2 folds (except for Zn in SMB by 30% and Cd in SSB unchanged), with an overall medium risk in the biowastes to an overall low risk in the biochars. Of course, these smaller effects for Zn and Cd was similarly reported by Zeng et al (2018) and Wang et al (2016) respectively treating sewage sludge and swine manure with pyrolysis. Generally, solid-solution partitioning of metals in environment conditions was mainly controlled by the total burden, OC and pH of the material ( Janssen et al, 1997 ; Sauve et al, 2000 ; Pan et al, 2001).…”

Section: Discussionsupporting

confidence: 59%

“…3 ; Table S2 ). Thereby, lower proportion of F1 but higher proportion of F3 and F4 in the biochars referred to stabilization into stable OM- and mineral-bound forms of the PTEs ( He et al, 2010 ; Cui et al, 2016 ; Zeng et al, 2018 ), existed originally as soluble salts in SM and SS before pyrolysis. Across the PTEs, the proportion of exchangeable pool decreased while OM (and/or sulfides) -bound fraction increased in the biochars after pyrolysis of the biowastes ( Fig.…”

Section: Discussionmentioning

confidence: 99%

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Pyrolyzed biowastes deactivated potentially toxic metals and eliminated antibiotic resistant genes for healthy vegetable production

Zhi

Rui

Liu

et al. 2020

Journal of Cleaner Production

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Potentially toxic metals (PTEs) and antibiotic resistance genes (ARGs) present in bio-wastes were the major environmental and health risks for soil use. If pyrolyzing bio-wastes into biochar could minimize such risks had not been elucidated. This study evaluated PTE pools, microbial and ARGs abundances of wheat straw (WS), swine manure (SM) and sewage sludge (SS) before and after pyrolysis, which were again tested for soil amendment at a 2% dosage in a pot experiment with a vegetable crop of pak choi ( Brassica campestris L.). Pyrolysis led to PTEs concentration in biochars but reduced greatly their mobility, availability and migration potential, as revealed respectively by leaching, CaCl 2 extraction and risk assessment coding. In SM and SS after pyrolysis, gene abundance was removed by 4 to 5 orders for bacterial, by 2-3 orders for fungi and by 3-5 orders for total ARGs. With these material amended, PTEs available pool decreased by 25% to 85% while all ARGs eliminated to background in the pot soil. Unlike a >50% yield decrease and a >30% quality decline with unpyrolyzed SM and SS, their biochars significantly ( p >0.05) increased biomass production and overall quality of pak choi grown in the amended soil. Comparatively, amendment of the biochars decreased plant PTEs content by 23-57% and greatly reduced health risk of pak choi, with total target hazard quotient values well below the guideline limit for subsistence diet by adult. Furthermore, biochar soil amendment enabled a synergic improvement on soil fertility, product quality, and biomass production as well as metal stabilization in the soil-plant system. Thus, biowastes pyrolysis and reuse in vegetable production could help build up a closed loop of production-waste-biochar-production, addressing not only circular economy but healthy food and climate nexus also and contributing to achieving the United Nations sustainable development goals.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 59%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Pyrolyzed biowastes deactivated potentially toxic metals and eliminated antibiotic resistant genes for healthy vegetable production

Zhi

Rui

Liu

et al. 2020

Journal of Cleaner Production

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“…Less TC contents of the manure biochars can be attributed to the low pyrolysis temperature that did not allow to concentrate C in the feedstock. The high TC contents at biochars from soybean and corn straw might be related to the depletion of the H and O during the pyrolysis process 24 . Domingues et al 25 reported that the biochars produced from cattle manure have relatively low TC as compared to the plant materials because of the presence of more labile organic compounds in animal manure which can be lost rapidly at high temperature before the formation of recalcitrant compounds.…”

Section: Resultsmentioning

confidence: 99%

Characterization and carbon mineralization of biochars produced from different animal manures and plant residues

Sarfaraz

Silva

Drescher

et al. 2020

Sci Rep

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Renewing carbon and re-establishing it again in the soil is one of the valuable means to cope with climate change. there are many technologies for carbon apprehension and storage, but the most important one gaining attention is biochar technology. So, to carbonize and return different biological materials back to the farmland, a comprehensive study was proposed to characterize and evaluate the carbon (C) mineralization of biochars produced from different animal manures and crop straws. Six types of biochars were prepared from animal manures (poultry litter, swine and cattle manures) and crop straws (rice, soybean, and corn straws). the biochars were analyzed for chemical characteristics (elemental variables, thermal decomposition, cation exchange capacity, pH, electrical conductivity, specific surface area, and surface functional groups) and an incubation experiment was conducted to evaluate C mineralization from soil biochar mixture. Biochars produced from crop straws resulted to have more c as compared to the biochars produced from animal manures. concentration of nitrogen was low, while P, K, Ca, and Mg were found reasonably higher in all biochars except swine manure biochar. the plant-derived biochars presented lower co 2 emissions when incorporated to soil at 1 and 2% of C. Varying but all the biochars prepared represented an alkaline pH. Biochars prepared from the crop straws resulted to have more c, alkaline in nature, high cec, low co 2 emissions, can sequester C and more suitable to enhance the soil fertility in comparison to biochars produced from other sources. In the Southern region of Brazil can be found immense amounts of diverse animal manure and plant residues as the region have a massive number of animal farms and crop production. Swine and poultry farms are the principal sources of the manure produced in the region. Rice is cultivated on about 1,000 M ha area 1 , while soybean and corn are also major crops grown in the region (more than 6,000 M ha area) 2. In the region, no-tillage planting system is used to grow crops for a long time, and crop straws are left on the surface at the time of harvesting. There may be noted an uneven decomposition of these organic materials and different environmental impacts can be noticed, such as releasing carbon dioxide (CO 2) into the atmosphere and N can be immobilized by microorganisms or can be escaped into the atmosphere in the form of N 2 O, N 2 and NH 3. Biochar is an alternative and beneficial strategy to dispose-off the animal manures and plant residues rather than keeping them on the place or applying to soil directly 3. Biochar is a solid C rich material obtained from organic waste burning in the absence or low supply of oxygen 4. A massive amount of different biomasses can be found to produce biochars such as animal manures, plant residues, sewage sludge, and agricultural wastes. Its production from different residues and wastes for the use of farm soils may be a valuable means to decrease the negative impacts of emissions (greenhouse gases) from the...

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“…There are numerous treatment methods that can mitigate most of the toxic gas emissions and water pollution due to leaching of nutrients and heavy metals from livestock manure, such as composting, calcination, 6,7 gasication, 8 and pyrolysis. 9 However, some of these techniques suffer from limitations and require further improvement, such as high temperature combustion and gasication, where the high contents of moisture and alkali metals in manure cause ash agglomeration. 10 In contrast, pyrolysis operating at lower temperature compared with combustion and gasication, which reduces the risk of ash agglomeration and toxic emissions such as NO x , SO 2 , and particulate matter.…”

Section: Introductionmentioning

confidence: 99%

Environmental risk assessment in livestock manure derived biochars

Wang

Zhang

et al. 2019

RSC Adv.

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Speciation and bioavailability of heavy metals in pyrolytic biochar of swine and goat manures

Cited by 158 publications

References 37 publications

Pyrolyzed biowastes deactivated potentially toxic metals and eliminated antibiotic resistant genes for healthy vegetable production

Pyrolyzed biowastes deactivated potentially toxic metals and eliminated antibiotic resistant genes for healthy vegetable production

Characterization and carbon mineralization of biochars produced from different animal manures and plant residues

Environmental risk assessment in livestock manure derived biochars

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