Influence of pyrolysis temperature on chemical speciation, leaching ability, and environmental risk of heavy metals in biochar derived from cow manure

Zhang, Peizhen; Zhang, Xiaoxiao; Li, Yanfei; Han, Lujia

doi:10.1016/j.biortech.2020.122850

Cited by 126 publications

(51 citation statements)

References 36 publications

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“…2 ) shows the reduction of the molar ratio with the increase of pyrolysis temperature. This result is in agreement with the results reported by Zhang et al 49 , where evaluation of biochar from cow manure produced at 300, 400, 500, 600, and 700 °C also reported H/C and O/C molar reduction with increase of temperature and attributed the results to the formation of stable aromatic structures. According to Ahmad et al 9 , at pyrolysis temperatures up to 480 °C, the decrease in H/C and O/C molar ratio with increasing temperature is due to the loss of carboxylic and phenolic functional groups that are responsible for the CEC; above 480 °C, the reduction occurs due to the processes of dehydration and deoxygenation, which reduce H- and O-containing functional groups.…”

Section: Resultssupporting

confidence: 93%

“…In contrast to Ref. 49 , where up to 73.3% of the Cd in cow manure biochar produced at 300, 400, 500, 600, and 700 °C was present in the directly toxic and bioavailable fraction, in this study, bioavailable and toxic forms represented 58.11 ± 1.19% (SS), to 54.86 ± 2.18% (SS 350 ), and 75.41 ± 6.67% (SSB 450 ). All Cd present in SSB 600 was on the non-bioavailable form (Fig.…”

Section: Resultscontrasting

confidence: 86%

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Induced changes of pyrolysis temperature on the physicochemical traits of sewage sludge and on the potential ecological risks

Souza

Bomfim

Almeida

et al. 2021

Sci Rep

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Biochar from sewage sludge is a low-cost sorbent that may be used for several environmental functions. This study evaluates the induced effects of pyrolysis temperature on the physicochemical characteristics of sewage sludge (SS) biochar produced at 350 (SSB350), 450 (SSB450) and 600 (SSB600), based on the metal enrichment index, metal mobility index (MMI), and potential ecological risk index (PERI) of Cd, Cu, Pb, and Zn. Increased pyrolysis temperature reduced the biochar concentration of elements that are lost as volatile compounds (C, N, H, O, and S), while the concentration of stable aromatic carbon, ash, alkalinity, some macro (Ca, Mg, P2O5, and K2O) and micronutrients (Cu and Zn), and toxic elements such as Pb and Cd increased. Increasing the pyrolysis temperature is also important in the transformation of metals from toxic and available forms into more stable potentially available and non-available forms. Based on the individual potential ecological risk index, Cd in the SS and SSB450 were in the moderate and considerable contamination ranges, respectively. For all pyrolysis temperature biochar Cd was the highest metal contributor to the PERI. Despite this, the potential ecological risk index of the SS and SSBs was graded as low.

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Section: Resultssupporting

confidence: 93%

Section: Resultscontrasting

confidence: 86%

Induced changes of pyrolysis temperature on the physicochemical traits of sewage sludge and on the potential ecological risks

Souza

Bomfim

Almeida

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Biochar is widely used, porous carbonaceous material for the purification of water/wastewater and the remediation of contaminated soil [ 1 – 3 ]. Biochar is mainly obtained via pyrolysis of organic biomass under anoxic conditions [ 4 – 6 ]. With the development of slash-and-char technology, the pyrolysis of biomass is more extensively used for the production of biochar and bioenergy.…”

Section: Introductionmentioning

confidence: 99%

Surface characterization of maize-straw-derived biochar and their sorption mechanism for Pb2+ and methylene blue

et al. 2020

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Biochar derived from straw is a potential low-cost adsorbent for metal ions and organic pollutants, but its practical application is still limited by the adsorption capacity. In this study, the correlation between the biochar's properties and pyrolysis temperature was explored. The adsorption mechanism was studied by monitoring the changes of biochar properties before and after adsorption using BET, SEM, XPS and FT-IR spectroscopy. The adsorption mechanism was revealed following the adsorption kinetics and the changes in biochar's properties before and after adsorption. The methylene blue (MB) and Pb 2+ adsorption removal efficiency reached 95% at the initial concentration of 125 and 500 mg/L, respectively. Physisorption, chemisorption, and pore filling mechanisms determined the adsorption process of MB and Pb 2+ on biochar. The Pb 2+ adsorption process was highly affected by chemical co-precipitation at higher pyrolysis temperatures. The appearance of tar particles increased the adsorption rate of Pb 2+. The biochar obtained at the pyrolysis temperature at 500, 800 and 900˚C proved to be applicable for Pb 2+ removal. Chemisorption and porosity dominated the MB adsorption, and biochars produced at pyrolysis temperatures of 200, 800 and 900˚C are potential materials for MB removal. This study provides optimal pyrolysis conditions for transforming maize straw into valuable, low-cost materials for the removal of different pollutants.

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“…Previous research determined that zinc, copper, and manganese are the main trace elements in livestock and poultry manure 25 . The main trace elements contained in feed additives have been widely used in livestock and poultry feed and provide good feed conditions for the healthy growth of livestock and poultry but result in higher zinc, copper and manganese levels in CM and WSM 26 .…”

Section: Resultsmentioning

confidence: 99%

Speciation and environmental risk of heavy metals in biochars produced by pyrolysis of chicken manure and water-washed swine manure

Wang

Zhang

Zeng

et al. 2021

Sci Rep

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This study was conducted to investigate the speciation, bioavailability and environmental risk of heavy metals (HMs) in chicken manure (CM) and water-washed swine manure (WSM) and their biochars produced at different pyrolysis temperatures (200 to 800 °C). As the pyrolysis temperature increased, the remaining proportion, toxicity characteristic leaching procedure (TCLP), HCl and diethylenetriamine pentaacetic acid (DTPA) of HMs gradually declined. This result proved that the speciation of HMs in chicken manure biochars (CMB) and water-washed swine manure biochars (WSMB) was influenced by pyrolysis temperature. The proportions of stable fractions were enhanced with increased pyrolysis temperature and weakened the HM validity for vegetation at 800 °C. Finally, the results of the risk assessment showed that the environmental risk of HMs in CMB and WSMB decreased with increasing pyrolysis temperature. Therefore, pyrolysis at 800 °C can provide a practical approach to lessen the initial and underlying heavy metal toxicity of CMB and WSMB to the environment.

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Influence of pyrolysis temperature on chemical speciation, leaching ability, and environmental risk of heavy metals in biochar derived from cow manure

Cited by 126 publications

References 36 publications

Induced changes of pyrolysis temperature on the physicochemical traits of sewage sludge and on the potential ecological risks

Induced changes of pyrolysis temperature on the physicochemical traits of sewage sludge and on the potential ecological risks

Surface characterization of maize-straw-derived biochar and their sorption mechanism for Pb2+ and methylene blue

Speciation and environmental risk of heavy metals in biochars produced by pyrolysis of chicken manure and water-washed swine manure

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