Influence of pyrolysis temperature on characteristics and environmental risk of heavy metals in pyrolyzed biochar made from hydrothermally treated sewage sludge

Wang, Xingdong; Chi, Qiaoqiao; Liu, Xuejiao; Wang, Yin

doi:10.1016/j.chemosphere.2018.10.189

Cited by 163 publications

(48 citation statements)

References 47 publications

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“…7 a). Similar to this study, evaluation by Wang et al 59 of biochar produced at temperatures of 300, 500, and 700 °C from hydrothermal pretreatment with pyrolysis (HTP) suggested that up to 99.97% of the Pb was in the residual fraction. Although Pb had the lowest MMI of all the metals studied, the index increased in line with temperature (SS 0.00 ± 0.00, SSB 350 0.00 ± 0.00, SSB 450 0.00 ± 0.00 and SSB 600 5.50 ± 0.78; Fig.…”

Section: Resultssupporting

confidence: 85%

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: 85%

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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show abstract

“…Based on the aforementioned data, the outcomes of this study are threefold: (1) environmental benefits via avoiding ecological damage from the release of toxic pollutants (e.g., MEG) into the ecosystem, (2) waste management via preventing the disposal of sewage sludge (e.g., preparation of biochar adsorbent), and (3) economic benefit (profit) via synthesizing novel adsorbent material having a twofold increase in the specific surface area compared to raw biochar. Wang et al [45] found that the combination of hydrothermal pretreatment with pyrolysis (HTP) would immobilize heavy metals in sewage sludge-derived biochar, as compared with the direct pyrolysis process. Their study also demonstrated that the increase in pyrolysis temperature could reduce the ecological risk associated with heavy metals in biochar prepared from the HTP process.…”

Section: Environmental Profitabilitymentioning

confidence: 99%

Synthesis of sludge-derived biochar modified with eggshell waste for monoethylene glycol removal from aqueous solutions

et al. 2020

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In this study, the pyrolysis of sewage sludge was employed to prepare a biochar (BC) adsorbent that was modified using eggshell wastes, obtaining eggshell-modified biochar (EMBC). The adsorbent material was used for the removal of monoethylene glycol (MEG) from aqueous solutions under various adsorption conditions. Results showed that the specific surface area of EMBC (i.e., 3.95 m 2 /g) was approximately twofold higher than that of BC, implying that the application of eggshell waste would improve the surface adsorption performance. The optimum adsorption pH value was 7, achieving MEG removal efficiencies of 29.9% for BC and 89.9% for EMBC using adsorbent dosage = 2 g/L, initial MEG concentration = 100 mg/L, and 25 °C within 60 min. The adsorption mechanisms were illustrated regarding XRD, FTIR, and SEM, demonstrating that surface adsorption, pore-filling, precipitation, and complexation contributed to the adsorption process. The adsorption data fitted well to the Langmuir isotherm model with the maximum monolayer adsorption capacity of 12.20 mg/g, implying a reversible physisorption mechanism. Based on a techno-economic feasibility assessment, the preparation of BC and EMBC adsorbents for the treatment of 1 m 3 of wastewater-containing ethylene glycol would require capital costs of 4.80 and 6.50 US$, respectively. The selling of adsorbents and the economic benefit of tertiary treated water showed adequate annual profitability with payback periods of 12.97 and 6.79 years for the BC and EMBC scenarios, respectively. Hence, the study succeeded in preparing efficient and low-cost adsorbents that could be used for the tertiary treatment of petrochemical industrial wastewater containing toxic environmental pollutants.

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“…However, most often, the hydrochar cannot be described as biochar since the reaction temperature is too low, low carbon contents, as well as an intolerable O/C and hydrogen to carbon (H/C) ratio [65,66]. Yet, recent work shows that integration of this hydrothermal carbonization with pyrolysis process positively contributes toward the high-quality biochar production and can stabilizes the heavy metal in solid products [67]. For example, by referring to the experimental findings by Olszewski et al [68], the preliminary hydrothermal treatment of brewery spent grains (that contains 70-90 wt.…”

Section: Hydrothermal Carbonizationmentioning

confidence: 99%

A Mini Review of Biochar Synthesis, Characterization, and Related Standardization and Legislation

Rashidi¹,

Yusup²

2020

Applications of Biochar for Environmental Safety

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The abundance of biomass in Malaysia creates an avenue for growth of bio-economic sector through the research and development (R&D) activities on the biochar production. Biochar that is described as a carbonaceous material derived from the thermochemical process at temperature of usually lower than 700°C is promising due to its applicability in wider range of applications, such as in soil amendment (fertilizer) and as a low-cost adsorbent for the pollution remediation, apart from minimizing the solid waste disposal problems. Therefore, this chapter discusses the current trends on various production techniques of biochar from both the lignocellulosic (plantation based waste materials) and non-lignocellulosic sources, as well as the physiochemical characteristics of the resulting biochar. In addition, overview of the biochar industry in Malaysia is presented in this chapter. Lastly, recap of standardization and legislation particularly related to the biochar utilization as a soil amendment agent is included to grasp readers' attention prior to the large scale applications.

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Influence of pyrolysis temperature on characteristics and environmental risk of heavy metals in pyrolyzed biochar made from hydrothermally treated sewage sludge

Cited by 163 publications

References 47 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

Synthesis of sludge-derived biochar modified with eggshell waste for monoethylene glycol removal from aqueous solutions

A Mini Review of Biochar Synthesis, Characterization, and Related Standardization and Legislation

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