Effects of pyrolysis temperature on biochar’s characteristics and speciation and environmental risks of heavy metals in sewage sludge biochars

Zhang, Xin; Zhao, Baowei; Liu, Hui; Zhao, Yue; Li, Liujun

doi:10.1016/j.eti.2022.102288

Cited by 84 publications

(21 citation statements)

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“…The XRF results also show the high content (%) of potassium (K) in AC (60.9%) and BB (76.82%), whereas PSB has the lowest K (6.0%). The AC and BB were produced at a higher pyrolysis temperature, which released the alkali minerals out of its structure, and oxygen bound functional groups disintegrated, resulting in the total reduction of acidic functional groups and vice versa . In addition, potassium is alkaline in nature and can possibly form potassium hydroxide, which is a strong base.…”

Section: Resultsmentioning

confidence: 99%

“…The AC and BB were produced at a higher pyrolysis temperature, which released the alkali minerals out of its structure, and oxygen bound functional groups disintegrated, resulting in the total reduction of acidic functional groups and vice versa. 42 In addition, potassium is alkaline in nature and can possibly form potassium hydroxide, which is a strong base. Therefore, the pH DI 's of AC and BB are higher compared to MB and PSB.…”

Section: Resultsmentioning

confidence: 99%

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Adsorption Kinetics of Cadmium and Lead by Biochars in Single- and Bisolute Brackish Water Systems

Rafiq,

Wongrod,

Vinitnantharat

2023

ACS Omega

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Adsorption Kinetics of Cadmium and Lead by Biochars in Single- and Bisolute Brackish Water Systems

Rafiq,

Wongrod,

Vinitnantharat

2023

ACS Omega

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“…Furthermore, another study concluded that the increase in pyrolysis temperature is known to increase surface area and stabilize the toxic metals present hence reducing the likelihood of leaching [29]. Hence, the produced char is considered low risk for the environment due to less bioavailability and decreased leaching capacity [30]. This also proves the importance of operating parameters in developing varying quality chars, which includes factors such as temperature, heating rate, operating reactor type, blending ratio, and feedstock types [31].…”

Section: Co-pyrolysis and Potential Chars For Water Treatmentmentioning

confidence: 99%

A review of prospects and current scenarios of biomass co-pyrolysis for water treatment

Zuhara

Mackey

Al‐Ansari

et al. 2022

Biomass Conv. Bioref.

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With ever-growing population comes an increase in waste and wastewater generated. There is ongoing research to not only reduce the waste but also to increase its value commercially. One method is pyrolysis, a process that converts wastes, at temperatures usually above 300 °C in a pyrolysis unit, to carbon-rich biochars among with other useful products. These chars are known to be beneficial as they can be used for water treatment applications; certain studies also reveal improvements in the biochar quality especially on the surface area and pore volume by imparting thermal and chemical activation methods, which eventually improves the uptake of pollutants during the removal of inorganic and organic contaminants in water. Research based on single waste valorisation into biochar applications for water treatment has been extended and applied to the pyrolysis of two or more feedstocks, termed co-pyrolysis, and its implementation for water treatment. The co-pyrolysis research mainly covers activation, applications, predictive calculations, and modelling studies, including isotherm, kinetic, and thermodynamic adsorption analyses. This paper focuses on the copyrolysis biochar production studies for activated adsorbents, adsorption mechanisms, pollutant removal capacities, regeneration, and real water treatment studies to understand the implementation of these co-pyrolyzed chars in water treatment applications. Finally, some prospects to identify the future progress and opportunities in this area of research are also described. This review provides a way to manage solid waste in a sustainable manner, while developing materials that can be utilized for water treatment, providing a double target approach to pollution management.

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“…Declining biochar yield and enhancing ash content, CEC, and surface area can result from the increase in pyrolysis temperature (Meng et al, 2013;Sun et al, 2014;Alkurdi et al, 2019). Moreover, the C/N ratio of biochar increased with increasing pyrolysis temperature which shows a faster reduction in N content than C, and it causes a drop in nitrogen-containing functional groups Zhang et al, 2022).…”

Section: Biocharmentioning

confidence: 99%

Reviewing the effect of pyrolysis temperature on the fourier-transform infrared spectra of biochars

Matin

Aydın

2022

Acta Horticulturae Et Regiotecturae

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Pyrolysis of feedstocks to produce biochar for soil remediation employed to be a convenient method regarding improvement of soil fertility, increasing carbon stability and decreasing greenhouse gas emissions. Biochar properties and its effect after incorporation into the soils vary depending on the characteristics of feedstocks and pyrolysis process. This paper aims to compare the effect of pyrolysis temperature on the frequency of functional groups in different biochars made from plant feedstocks over the temperature range from 300 °C to 700 °C. An increase in pyrolysis temperature positively affects biochar surface properties until the deformation step in C = O, –COOH, and OH groups and as a result, the surface area of biochar decreases at high temperature (more than 600 °C). The breakdown of hemicellulose, cellulose, and lignin also occurs at temperatures more than 600 °C. Consequently, the biochar quality is reduced with increasing pyrolysis temperature although such biochar may be suitable for rising the content of stable carbon in the soils. Over the long-term, the stability of biochar can contribute to carbon sequestration, retention of water and ions in the soil.

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Effects of pyrolysis temperature on biochar’s characteristics and speciation and environmental risks of heavy metals in sewage sludge biochars

Cited by 84 publications

References 50 publications

Adsorption Kinetics of Cadmium and Lead by Biochars in Single- and Bisolute Brackish Water Systems

Adsorption Kinetics of Cadmium and Lead by Biochars in Single- and Bisolute Brackish Water Systems

A review of prospects and current scenarios of biomass co-pyrolysis for water treatment

Reviewing the effect of pyrolysis temperature on the fourier-transform infrared spectra of biochars

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