Potential application of gasification to recycle food waste and rehabilitate acidic soil from secondary forests on degraded land in Southeast Asia

Yang, Zhengming; Koh, Shun Kai; Ng, Wei Cheng; Lim, Reuben C. J.; Tan, Hugh Tiang Wah; Tong, Yen Wah; Dai, Yanjun; Chong, Clive; Wang, Chi-Hwa

doi:10.1016/j.jenvman.2016.02.020

Cited by 63 publications

(14 citation statements)

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“…In an industrial gasification plant, biochar could be sold as barbecue materials and fertilizer after treatment [71,72]. The quality of produced biochar is closely related to its carbon content [73].…”

Section: Effects Of Er On Biochar Production Rate and Its Qualitymentioning

confidence: 99%

Biomass gasification for syngas and biochar co-production: Energy application and economic evaluation

et al. 2018

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Syngas and biochar are two main products from biomass gasification. To facilitate the optimization of the energy efficiency and economic viability of gasification systems, a comprehensive fixed-bed gasification model has been developed to predict the product rate and quality of both biochar and syngas. A coupled transient representative particle and fixbed model was developed to describe the entire fixed-bed in the flow direction of primary air. A three-region approach has been incorporated into the model, which divided the reactor into three regions in terms of different fluid velocity profiles, i.e. natural convection region, mixed convection region, and forced convection region, respectively. The model could provide accurate predictions against experimental data with a deviation generally smaller than 10%. The model is applicable for efficient analysis of fixed-bed biomass gasification under variable operating conditions, such as equivalence ratio, moisture content of feedstock, and air inlet location. The optimal equivalence ratio was found to be 0.25 for maximizing the economic benefits of the gasification process.

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Section: Effects Of Er On Biochar Production Rate and Its Qualitymentioning

confidence: 99%

Biomass gasification for syngas and biochar co-production: Energy application and economic evaluation

et al. 2018

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“…It has been showcased in a number of studies that gasification is capable of treating a diverse source of solid waste such as sludge, wood and horticultural waste, food waste, dairy manure, and etc. [8][9][10][11] with encouraging results. Since gasification is conducted in an oxygen deficient environment as opposed to the oxygen-rich environment in incineration, the formation of the toxic pollutants is effectively restrained [9,12].…”

Section: Introductionmentioning

confidence: 92%

“…Two types of final feedstock were prepared for gasification/ co-gasification: (i) 100 wt% wood chips (100%WC), and (ii) 30 wt% chicken manure + 70 wt% wood chips mixture (30%CM+70%WC). The reason for using a 30 wt% chicken manure in the mixture was to avoid bridging in the hopper based on our past experience that feedstock with sizes below the lower limit (1.27 cm) has a higher likelihood of blocking the hopper, hence obstructing the flow of feedstock down the reactor [11].…”

Section: Feedstock Preparationmentioning

confidence: 99%

“…While the co-gasification of chicken manure and wood chips was only conducted at one mixing ratio (30% chicken manure) due to limited amount of feedstock collected, the performance of other mixing ratios (e.g. 10%, 20% chicken manure) could be inferred from our previous study using food waste [11]. When co-gasified with wood chips at increasing ratio of food waste (0%, 20%, 30% and 40% food waste), the quality of syngas produced in terms of its LHV slightly increased, before encountering the bridging issue due to large amount of undersized particles.…”

Section: Gasification Performancementioning

confidence: 99%

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Co-gasification of woody biomass and chicken manure: Syngas production, biochar reutilization, and cost-benefit analysis

You

Ran

et al. 2017

Energy

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The management and disposal of livestock manure has become one of the top environmental issues at a global scale in line with the tremendous growth of poultry industry over the past decades. In this work, a potential alternative method for the disposal of chicken manure from Singapore local hen layer farms was studied. Gasification was proposed as the green technology to convert chicken manure into clean energy. Through gasification experiments in a 10 kW fixed bed downdraft gasifier, it was found that chicken manure was indeed a compatible feedstock for gasification in the presence of wood waste. The co-gasification of 30 wt% chicken manure and 70 wt% wood waste produced syngas of comparable quality to that of gasification of pure wood waste, with a syngas lower heating value (LHV) of 5.23 MJ/Nm 3 and 4.68 MJ/Nm 3 , respectively. Furthermore, the capability of the gasification derived biochar in the removal of an emerging contaminant (artificial sweetener such as Acesulfame, Saccharin and Cyclamate) via adsorption was also conducted in the second part of this study. The results showed that the biochar was effective in the removal of the contaminant and the mechanism of adsorption of artificial sweetener by biochar was postulated to be likely via electrostatic interaction as well as specific interaction. Finally, we conducted a cost-benefit analysis for the deployment of a gasification system in a hen layer farm using a Monte Carlo simulation model.

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“…Anaerobic digestion (AD) of organic matter is a robust technology for biogas synthesis from different types of waste (Borjesson and Mattiasson, 2008), and numerous studies have been conducted to optimise the synthesis of biogas and evaluate potential substrates (Jiang et al, 2018). Anaerobic digesters can be fed with a wide range of substrates such as grass biomass (Abendroth et al, 2017), sewage sludge from water treatment (Hardegen et al, 2018), microalgal biomass (Doloman et al, 2017), and food waste (Yang et al, 2016), among others. The main goal of AD is the production of biogas, a renewable energy that can be used for heating, electricity, and many other operations that use combustion engines (Lindkvist et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Shedding light on biogas: a transparent reactor triggers the development of a biofilm dominated by Rhodopseudomonas faecalis that holds potential for improved biogas production

Abendroth

A²,

Porcar³

et al. 2019

Preprint

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Conventional anaerobic digesters intended for the production of biogas usually operate in complete darkness. Therefore, little is known about the effect of light on microbial communities operating in anaerobic digesters. In the present work, we have studied through 16S rRNA gene amplicon Nanopore sequencing and shotgun metagenomic sequencing the taxonomic and functional structure of the microbial community forming a biofilm on the inner wall of a lab-scale transparent anaerobic biodigester illuminated with natural sunlight. The biofilm was composed of microorganisms involved in the four metabolic processes needed for biogas production. The biofilm proved surprisingly rich in Rhodopseudomonas faecalis, a 2 4 6 8 10 12 14 16 18 20 22 24 26 28versatile bacterium able to carry out a photoautotroph metabolism when grown under anaerobic conditions. Our results suggest that this bacterium, able to fix carbon dioxide, could be considered for its use in transparent biogas fermenters in order to contribute to the production of optimized biogas with a higher CH4:CO2 ratio than the biogas produced in regular, opaque digesters. To the best of our knowledge, this is the first study supporting illuminated bioreactors as a new bioprocess for the obtention of biogas enriched in methane. Keywords: Anaerobic digestion, Rhodopseudomonas faecalis, optimized biogas, shotgun metagenomic sequencing, waste water treatment, phototrophism, 16S rRNA gene amplicon Nanopore sequencing.30 32 34 36 38 40The microbial communities operating in the digester are the final key players responsible for the quality of the produced biogas. The role of different microorganisms in the four metabolic steps carried out during the AD of organic matter (hydrolysis, fermentation, acetogenesis, and methanogenesis) has been widely studied (Zinder, 1984). A diverse number of Bacteria are known to be involved in the hydrolysis and further fermentation of complex polymers, whereas the oxidation of intermediate fermentation products to acetate is performed by either hydrogen-or formate-producing acetogens (Stams & Plugge, 2009). Lastly, methane synthesis is mainly derived from acetate and H2/CO2 by acetoclastic and hydrogenoclastic methanogenic Archaea. Therefore, an improved understanding of the microbial communities 42 44 46 48 50 52 54 56 58 60 62 64 influence of light in the process (Sawayama, 2000; Tada et al., 2006; Wei et al., 2016;Reverso, 2017), mainly because the obvious fact that conventional AD systems operate in complete darkness. Interestingly, a previous study reported an increment of the relative concentration of methane when an anaerobic digester was operated under the influence of light (Tada et al., 2006). However, a holistic study of the effect of light on the entire microbiome of anaerobic digesters had yet to be addressed.The aim of the present work was to analyse the effect of natural sunlight on the microbial community of a lab-scale anaerobic co-digester, in order to explore the potential of this strategy to produce high quality biogas. In o...

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Potential application of gasification to recycle food waste and rehabilitate acidic soil from secondary forests on degraded land in Southeast Asia

Cited by 63 publications

References 29 publications

Biomass gasification for syngas and biochar co-production: Energy application and economic evaluation

Biomass gasification for syngas and biochar co-production: Energy application and economic evaluation

Co-gasification of woody biomass and chicken manure: Syngas production, biochar reutilization, and cost-benefit analysis

Shedding light on biogas: a transparent reactor triggers the development of a biofilm dominated by Rhodopseudomonas faecalis that holds potential for improved biogas production

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