Effects of residence time on characteristics of biochars prepared via co-pyrolysis of sewage sludge and cotton stalks

Wang, Zhipu; Liu, Kai; Xie, Lipeng; Zhu, Henan; Ji, Shibo; Shu, Xinqian

doi:10.1016/j.jaap.2019.104659

Cited by 104 publications

(58 citation statements)

References 27 publications

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“…To our current knowledge, residence time can affect the yields and properties of BC. Recently, Wang et al (2019b) demonstrated that the yield significantly decreased with the increase of residence time. In addition, the production of tar and biogas both increased, which was ascribed to the pyrolysis of volatile substances in biomass.…”

Section: The Physicochemical Properties Of Biocharmentioning

confidence: 99%

Review of organic and inorganic pollutants removal by biochar and biochar-based composites

Liang

Tan

et al. 2021

Biochar

459

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Biochar (BC) has exhibited a great potential to remove water contaminants due to its wide availability of raw materials, high surface area, developed pore structure, and low cost. However, the application of BC for water remediation has many limitations. Driven by the intense desire of overcoming unfavorable factors, a growing number of researchers have carried out to produce BC-based composite materials, which not only improved the physicochemical properties of BC, but also obtained a new composite material which combined the advantages of BC and other materials. This article reviewed previous researches on BC and BC-based composite materials, and discussed in terms of the preparation methods, the physicochemical properties, the performance of contaminant removal, and underlying adsorption mechanisms. Then the recent research progress in the removal of inorganic and organic contaminants by BC and BC-based materials was also systematically reviewed. Although BC-based composite materials have shown high performance in inorganic or organic pollutants removal, the potential risks (such as stability and biological toxicity) still need to be noticed and further study. At the end of this review, future prospects for the synthesis and application of BC and BC-based materials were proposed. This review will help the new researchers systematically understand the research progress of BC and BC-based composite materials in environmental remediation.

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Section: The Physicochemical Properties Of Biocharmentioning

confidence: 99%

Review of organic and inorganic pollutants removal by biochar and biochar-based composites

Liang

Tan

et al. 2021

Biochar

459

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“…Guo et al investigated the co-pyrolytic behavior of biomass and coal and low heating rates (10-50°C/min) and higher heating rates (10°C/min) in tubular reactor and furnace and concluded that under inert atmospheric condition, the two fuels experience autonomous thermal conversion, but lower heating rates are better than higher heating rates in terms of better conversion[107]. Wang et al explored the effect of residence time (30-150 min) on copyrolysis product of sewage sludge and biomass and concluded that extended residence times elevate the pH and ash contents of the biochars, but these conditions decreased the C, N, and H contents[108].3.4.2. Cocombustion.Cocombustion is a high-temperature thermochemical conversion technique in which sludge/coal, coal/biomass, and biomass/sludge blends undergo thermal degradation and release volatile matter such as CO, CO 2 , H 2 O, H 2 , CH 4 , and tar.…”

mentioning

confidence: 99%

A Comprehensive Review on Thermal Coconversion of Biomass, Sludge, Coal, and Their Blends Using Thermogravimetric Analysis

Hameed

Naqvi

et al. 2020

Journal of Chemistry

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Lignocellulosic biomass is a vital resource for providing clean future energy with a sustainable environment. Besides lignocellulosic residues, nonlignocellulosic residues such as sewage sludge from industrial and municipal wastes are gained much attention due to its large quantities and ability to produce cheap and clean energy to potentially replace fossil fuels. These cheap and abundantly resources can reduce global warming owing to their less polluting nature. The low-quality biomass and high ash content of sewage sludge-based thermal conversion processes face several disadvantages towards its commercialization. Therefore, it is necessary to utilize these residues in combination with coal for improvement in energy conversion processes. As per author information, no concrete study is available to discuss the synergy and decomposition mechanism of residues blending. The objective of this study is to present the state-of-the-art review based on the thermal coconversion of biomass/sewage sludge, coal/biomass, and coal/sewage sludge blends through thermogravimetric analysis (TGA) to explore the synergistic effects of the composition, thermal conversion, and blending for bioenergy production. This paper will also contribute to detailing the operating conditions (heating rate, temperature, and residence time) of copyrolysis and cocombustion processes, properties, and chemical composition that may affect these processes and will provide a basis to improve the yield of biofuels from biomass/sewage sludge, coal/sewage sludge, and coal/biomass blends in thermal coconversion through thermogravimetric technique. Furthermore, the influencing factors and the possible decomposition mechanism are elaborated and discussed in detail. This study will provide recent development and future prospects for cothermal conversion of biomass, sewage, coal, and their blends.

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“…The cobs were broken into smaller pieces of average length 3 cm to fit into the 60 L cylindrical batch bio‐reactor. The corncobs in double replicates of 2, 2. and 3 kg batches were pyrolysed in the tight‐fitted bio‐reactor under recommended slow pyrolysis temperature conditions of 300–600°C (Manyà, 2012; Liu et al ., 2015; Shariff et al ., 2016b) and a constant residence time of 120 min to obtain biochar of good quality and uniform physiochemical and structural characteristics (Wang et al ., 2019). After natural cooling to room temperature, the resultant biochar products were weighed to obtain the biochar yield using Equation () (Gupta et al ., 2018).…”

Section: Methodsmentioning

confidence: 99%

Development of maize cob‐based biochar filter for water purification

Oluk

Nagawa

Banadda

et al. 2020

Water & Environment J

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The study aimed at biochar production from maize cob and its performance in improving water physiochemical attributes. Three feedstock masses (2, 2.5, 3 kg) were used for biochar production. Nine treatment combinations of T1L1, T1L2, T1L3, T2L1, T2L2, T2L3, T3L1, T3L2 and T3L3 in triplicate were used for biochar performance. Biochar yield of 50% was averagely achieved at slow pyrolysis conditions (300 to 600°C) and 120 min residence time. Biochar had 4.13% moisture content, 6.86% ash, 17.70% volatile matter, 71.28% fixed carbon, and a pH of 10.27. Odour, colour, and total hardness of the wastewater improved after filtration using biochar to acceptable levels for potable water use. Total hardness reduced by 51.9% in T2L2 and 44.4% in T3L2. Findings front maize cob biochar as a purification technology for domestic potable water use. There is need for maize cob biochar performance on heavy metals and when it is sandwiched with other materials.

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Effects of residence time on characteristics of biochars prepared via co-pyrolysis of sewage sludge and cotton stalks

Cited by 104 publications

References 27 publications

Review of organic and inorganic pollutants removal by biochar and biochar-based composites

Review of organic and inorganic pollutants removal by biochar and biochar-based composites

A Comprehensive Review on Thermal Coconversion of Biomass, Sludge, Coal, and Their Blends Using Thermogravimetric Analysis

Development of maize cob‐based biochar filter for water purification

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