Biochar production by sewage sludge pyrolysis

Agrafioti, Evita; Bouras, George; Kalderis, Dimitrios; Diamadopoulos, Evan

doi:10.1016/j.jaap.2013.02.010

Cited by 546 publications

(274 citation statements)

References 32 publications

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“…Thermal degradation of sewage sludge (higher total C) explains greater decline in yield and increase in total elemental composition than those from latrine waste with increasing pyrolysis temperatures. Sewage sludge biochar yield was lower than reported by Yuan et al (2015), in the similar range as reported by Hossain et al (2011) and higher than reported by Agrafioti et al (2013). The composition of the sludges could explain the differences.…”

Section: Content Of Fecal Biocharsupporting

confidence: 78%

Biochar Types from Latrine Waste and Sewage Sludge Differ in Physico-Chemical Properties and Cadmium Adsorption

Koetlisi¹,

Muchaonyerwa²

2017

American Journal of Applied Sciences

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Pyrolysis of latrine fecal waste could produce valuable products for minimizing environmental contamination with heavy metals. The objective of this study was to determine yields, characteristics and cadmium (Cd) sorption of biochar from latrine fecal waste and sewage sludge, as affected by pyrolysis temperature. Slow pyrolysis at 350, 550 and 650°C, was used to produce the biochar. In addition to proximate and ultimate analysis, surface area, porosity and functional groups were analyzed. A batch sorption study was conducted to determine the cadmium sorption capacity of the biochar. Biochar from latrine waste had higher yield, ash content, surface area and pore volume and lower total and fixed carbon (C) and volatile matter than from sewage sludge. Yield, volatile matter, total C, nitrogen (N) and hydrogen (H) decreased with pyrolysis temperature, while ash content, surface area and porosity increased. Surface functional groups of the biochar also varied with feedstock and pyrolysis temperature. The Cd sorption capacities were higher for biochar from latrine waste than from sewage sludge. The findings indicated that characteristics of biochar from latrine waste differ from that of sewage sludge origin and has greater potential as an adsorbent for removal of Cd from wastewater.

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Section: Content Of Fecal Biocharsupporting

confidence: 78%

Biochar Types from Latrine Waste and Sewage Sludge Differ in Physico-Chemical Properties and Cadmium Adsorption

Koetlisi¹,

Muchaonyerwa²

2017

American Journal of Applied Sciences

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“…Pyrolysis converts the municipal sewage sludge into biochar, a carbonaceous solid product that is enriched surface functional groups and has a well-developed pore structure (Agrafioti et al, 2013;Yuan et al, 2015). Pyrolysis treatment of sewage sludge has been shown to decrease extractable concentrations of organic pollutants, such as PAHs (Zielinska and Oleszczuk, 2015), and the bioavailable fractions of toxic elements Lu et al, 2015) present within it.…”

Section: Introductionmentioning

confidence: 99%

Modest amendment of sewage sludge biochar to reduce the accumulation of cadmium into rice(Oryza sativa L.): A field study

Zhang

Chen

Liao

et al. 2016

Environmental Pollution

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“…The following parameters were determined in the thermally converted materials: dry matter content at 105°C for 12 h [8], ash [14], and pH by potentiometric method [15]. The elemental composition (C, H, N, S) of biochars was determined using CHNS analyser (Vario EL Cube manufactured by Elementar) [16].…”

Section: Chemical Analyses Of Biocharmentioning

confidence: 99%

The Effect of Low-Temperature Conversion of Plant Materials on the Chemical Composition and Ecotoxicity of Biochars

Gondek

Mierzwa–Hersztek

Baran

et al. 2016

Waste Biomass Valor

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The chemical composition of biochars varies considerably depending on the chemical composition of biomass used for its production and conditions of the thermal conversion process. In the context of chemical composition, biochars are different from other types of organic matter in that they contain many more aromatic carbon compounds. The aims of this study were as follows:(1) to investigate the effect of pyrolysis process of plant material on the concentrations of macroelements, trace elements and polycyclic aromatic hydrocarbons (PAHs) in the biochars; (2) to evaluate the ecotoxicity of the biochars; (3) to integrate chemical and toxicity properties of biochars in order to assess their safe utilisation as fertiliser materials. It was found that the elemental composition, the contents of macronutrients and trace elements in biochars were determined by the type of converted biomass. In the case of contents of volatile elements, such as nitrogen and sulphur, the process conditions were of great importance. Among the analysed trace elements, only the cadmium content exceeded the limit value for premium class biochars. The process of thermal conversion of organic materials did not cause mobilisation of available forms of most of the studied trace elements. In the course of the study, it was found that the extracts from wheat straw biochar (WSB) were low-toxic, while the extracts from biochars derived from rape straw (RSB), Miscanthus straw (MSB), sawdust (SB), bark (BB) and leaves of trees (LTB) were highly toxic to V. fischeri. Based on the response of the test organism, the analysed biochars were arranged in the following order: WSB \ BB \ RSB \ LTB \ MSB \ SB. The highest total content of PAHs ( P 16 PAHs) was determined in rape straw biochar, and the lowest, in sawdust biochar. The studies revealed a negative correlation between the content of most of PAHs and inhibition of Vibrio fischeri luminescence. Graphical Abstract

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Biochar production by sewage sludge pyrolysis

Cited by 546 publications

References 32 publications

Biochar Types from Latrine Waste and Sewage Sludge Differ in Physico-Chemical Properties and Cadmium Adsorption

Biochar Types from Latrine Waste and Sewage Sludge Differ in Physico-Chemical Properties and Cadmium Adsorption

Modest amendment of sewage sludge biochar to reduce the accumulation of cadmium into rice(Oryza sativa L.): A field study

The Effect of Low-Temperature Conversion of Plant Materials on the Chemical Composition and Ecotoxicity of Biochars

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