Slow pyrolysis of biosolids in a bubbling fluidised bed reactor using biochar, activated char and lime

Patel, Savankumar; Kundu, Sazal; Halder, Pobitra; Veluswamy, Ganesh K.; Pramanik, Biplob Kumar; Paz‐Ferreiro, Jorge; Surapaneni, Aravind; Shah, Kalpit

doi:10.1016/j.jaap.2019.104697

Cited by 36 publications

(3 citation statements)

References 59 publications

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“…This can be due to the decomposition of organic matter, thus forming micropores. With increasing pyrolysis temperature, pore blocking substances are released or are thermally cracked, increasing the externally accessible surface area 19,29,46–48 …”

Section: Resultsmentioning

confidence: 99%

Biochar from slow pyrolysis of biological sludge from wastewater treatment: characteristics and effect as soil amendment

Vilas-Boas

Tarelho

Kamali

et al. 2021

Biofuels Bioprod Bioref

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Biological sludge from wastewater treatment is a by‐product from the pulp and paper industry, for which several management approaches are being researched to develop added‐value applications and to decrease the disposal costs. This work studied biological sludge pyrolysis to produce biochar for further use as soil amendment. The pyrolysis was conducted in a bench‐scale fixed‐bed reactor using distinct operating conditions, namely heating rate between 2 °C min−1 and 30 °C min−1 and peak temperature between 300 °C and 600 °C. The results demonstrated that biochar yield was between 0.40 and 0.73 kg kg–1 dry sludge. A trend for biochar yield to decrease with increasing peak temperature and heating rate was observed. The carbon content of biochar was between 42.8 and 47.0 wt%. The biochar pH was between 6.9 and 11.2. The effect of the biochar produced by pyrolysis as a soil corrective was evaluated in this work. Samples of biochar produced at 450 °C and 10 °C min−1 were incubated in a selected soil and its influence on soil properties and plant growth was evaluated. It was observed that the biochar portion 2.5%, 5%, and 10% promoted an increase in soil pH and an increase in water retention. The biochar portion 2.5% and 5% promoted a higher growth of Lepidium sativum plants. The results demonstrated the potential of the pyrolysis of biological sludge from the pulp and paper industry to produce biochar to be further used as a soil amendment. This strategy is of major importance in this industrial sector, thus contributing to the European Union goals on circular economy and industrial sustainability. © 2021 Society of Industrial Chemistry and John Wiley & Sons Ltd.

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Section: Resultsmentioning

confidence: 99%

Biochar from slow pyrolysis of biological sludge from wastewater treatment: characteristics and effect as soil amendment

Vilas-Boas

Tarelho

Kamali

et al. 2021

Biofuels Bioprod Bioref

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“…Slow pyrolysis can also produce bio-oil as a by-product, containing oxygenated organic molecules like acids, esters, ketones, and phenols [49]. It involves some production processes as described by [50][51][52][53].…”

Section: Biochar Production Methodsmentioning

confidence: 99%

Biochar Improves Soil Fertility and Crop Performance: A Case Study of Nigeria

Zubairu,

Michéli,

Ocansey

et al. 2023

Soil Systems

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Africa, specifically Nigeria, has witnessed a dramatic increase in population over the last century, prompting efforts to ensure sustainable food production and quality. Concerns for soil sustainability and food security have led to the exploration of cost-effective methods, such as biochar, to enhance soil quality. Researchers in Nigeria and Africa as a whole have investigated biochar’s potential to improve soil fertility and crop performance across various agroecological zones. This paper aims to review recent biochar research priorities on soil fertility and crop performance with an emphasis on various sole biochar applications and combinations with fertilizers to determine the research gaps that need to be developed more in biochar research in Nigeria. From the papers reviewed, sole biochar applications and biochar + macronutrients and biochar + manure combinations were studied more dominantly, while biochar + micronutrients research projects were scanty despite their low content in the semi-arid soils of Nigeria. The studies were spread across the country with the majority taking place in derived savanna and humid forest, while Sudan savanna and Sahel savanna received less research attention despite being characterized by a low-fertile soil and vast area of land. Research involving BC in the context of Sahel savanna (SLS) and Sudan savanna (SS) soils is strongly encouraged in Nigeria. This research should encompass a wide range of investigations, including sole BC applications and combinations of BC with macronutrients, micronutrients, and manure, as well as exploring its potential as a slow-release fertilizer. Incorporating exclusive biochar in substantial amounts appears economically unfeasible within the context of local biochar production. However, it can be utilized in the synthesis of slow-release fertilizers, requiring smaller quantities and potentially offering cost-effectiveness. This approach enhances soil condition and crop productivity. Challenges are faced due to less commercial production as a result of inadequate power and structural facilities. Exploring the modification of local biochar for slow-release fertilizers through future research offers potential profitability.

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“…However, the fast pyrolysis results strongly depend on the type of pyrolysis reactor [13][14][15][16][17][18][19][20]. For the fast pyrolysis process, different types of reactors were developed in the past years including fixed bed [13], bubbling fluidized-bed and circulating fluidized-bed reactors [15,20], ablative, auger [19], and rotating reactors etc. The reactor design strongly affects the product yield, heat and mass transfer and allows the solid and volatile residence time to be controlled [21].…”

Section: Introductionmentioning

confidence: 99%

Fast Pyrolysis of Flax Shive in a Screw‐Type Reactor

et al. 2021

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A novel screw-type reactor for the fast pyrolysis of agricultural waste (flax shive) is described. A preliminary study on the influence of process parameters on the yield, composition, and properties of pyrolysis products was carried out. Based on the results obtained, the optimal conditions of fast pyrolysis of flax shive particles in terms of feedstock particle size, solid residence time, and process temperature were identified. Considering the construction, the developed reactor seems to be close to the screw fluidized bed and auger reactor and is characterized by a simple design and operation control. Moreover, the proposed reactor can be used for continuous pyrolysis without any significant modification.

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Slow pyrolysis of biosolids in a bubbling fluidised bed reactor using biochar, activated char and lime

Cited by 36 publications

References 59 publications

Biochar from slow pyrolysis of biological sludge from wastewater treatment: characteristics and effect as soil amendment

Biochar from slow pyrolysis of biological sludge from wastewater treatment: characteristics and effect as soil amendment

Biochar Improves Soil Fertility and Crop Performance: A Case Study of Nigeria

Fast Pyrolysis of Flax Shive in a Screw‐Type Reactor

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