Carbon dioxide as a carrier gas and biomass addition decrease the total and bioavailable polycyclic aromatic hydrocarbons in biochar produced from sewage sludge

Kończak, Magdalena; Gao, Yanzheng; Oleszczuk, Patryk

doi:10.1016/j.chemosphere.2019.04.029

Cited by 39 publications

(4 citation statements)

References 39 publications

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“…Previous studies have also observed the formation of PAHs during pyrolysis, regardless of biomass type, but at concentrations deemed acceptable under Germany’s Federal Soil Protection (Basic quality scenario). 35 , 36 …”

Section: Resultsmentioning

confidence: 99%

“…Previous studies have also observed the formation of PAHs during pyrolysis, regardless of biomass type, but at concentrations deemed acceptable under Germany's Federal Soil Protection (Basic quality scenario). 35,36 However, it should be noted that relying solely on the total concentration of these 16 PAHs may not provide a comprehensive assessment of the environmental risk associated with biochar, potentially leading to significant underestimation of the actual risk posed by organic pollutants. 37 Therefore, luminescence bacteria toxicity was utilized as a measure to evaluate the environmental risk of PAHs more accurately.…”

Section: Identification Of Biochar Toxicitymentioning

confidence: 99%

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Releasing and Assessing the Toxicity of Polycyclic Aromatic Hydrocarbons from Biochar Loaded with Iron

He,

Dai,

et al. 2023

ACS Omega

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Iron (Fe)-loaded biochar has garnered attention for its potential applications in recent years. However, the pyrolysis process of Fe-loaded biochar generates polycyclic aromatic hydrocarbons (PAHs), which can have adverse effects on both human health and the environment. This study explored the correlation between Fe loading and PAH production in Fe-loaded biochar. The results indicate that increasing Fe loading in biochar reduces the PAH concentration, with the most significant decrease observed in naphthalene (0.02–0.08 mg/kg). This reduction can be attributed to the decrease in precursor compounds (e.g., C 2 H 2 ), substitution of the C=O bond by Fe–O, and a decrease in the dissolved organic matter concentration (3.19–10.76 mg/L) with Fe loading. When Fe loading increased from 0 to 10%, the ecological toxicity of biochar increased by 33.48% due to an elevated production of dibenzo[ a , h ]anthracene, which poses a significant risk to human health. Therefore, it is imperative to take into consideration the ecological risk of PAHs prior to the application of Fe-loaded biochar. This study presents a comprehensive risk assessment of Fe-loaded biochar and provides valuable insights into the optimization of its production and safe application.

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Section: Resultsmentioning

confidence: 99%

Section: Identification Of Biochar Toxicitymentioning

confidence: 99%

Releasing and Assessing the Toxicity of Polycyclic Aromatic Hydrocarbons from Biochar Loaded with Iron

He,

Dai,

et al. 2023

ACS Omega

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“…Furthermore, co-feeding or changing additional gas from N 2 to CO 2 /O 2 is a potential technique to minimize the PAHs formation in biochar products. Kon ´czak et al [82] analyzed the evolution of PAHs profile from sewage-sludge biochar with two different carrier gas of CO 2 and N 2 . Biochar produced in the presence of CO 2 gas may reduce the PAHs amount up to 52 % compared to the N 2 purge.…”

Section: Pyrolysis Timementioning

confidence: 99%

“…Kończak et al. 82 analyzed the evolution of PAHs profile from sewage‐sludge biochar with two different carrier gas of CO 2 and N 2 . Biochar produced in the presence of CO 2 gas may reduce the PAHs amount up to 52 % compared to the N 2 purge.…”

Section: Efforts In Reducing Polycyclic Aromatic Hydrocarbons In Biocharmentioning

confidence: 99%

Polycyclic Aromatic Hydrocarbons Occurrences in Biomass Char and Its Mitigation Approaches: A Mini Review

et al. 2023

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Biochar is a porous fine‐grained substance produced from the pyrolysis technology of biomass that can be commercially used as a soil conditioner to promote soil fertility. Biochar is characterized by high carbon content, stability, and porosity. However, organic pollutants residue of polycyclic aromatic hydrocarbons (PAHs) is also formed during the pyrolysis of biochar. The high concentration of PAHs adversely degrades the quality of biochar for soil amendment application. Meanwhile, highly toxic‐PAHs concentration may pose a potential threat to both human health and the environment. The total PAHs yield is mainly influenced by the pyrolysis condition and feedstock resource. This review aims to discuss the conversion pyrolysis technology of biochar and factors that may influence the PAHs formation. The key research findings from this literature will lead to some strategies to minimize the PAHs compound in biochar by controlling the pyrolysis conditions through higher pyrolysis temperature, carrier gas flow, and prolonged pyrolysis time or by selecting suitable feedstock with lower lignin content.

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Combined effects of earthworms and biochar on PAHs-contaminated soil remediation: A review

et al. 2022

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Carbon dioxide as a carrier gas and biomass addition decrease the total and bioavailable polycyclic aromatic hydrocarbons in biochar produced from sewage sludge

Cited by 39 publications

References 39 publications

Releasing and Assessing the Toxicity of Polycyclic Aromatic Hydrocarbons from Biochar Loaded with Iron

Releasing and Assessing the Toxicity of Polycyclic Aromatic Hydrocarbons from Biochar Loaded with Iron

Polycyclic Aromatic Hydrocarbons Occurrences in Biomass Char and Its Mitigation Approaches: A Mini Review

Combined effects of earthworms and biochar on PAHs-contaminated soil remediation: A review

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