Effect of aerobic pre-treatment on hydrogen and methane production in a two-stage anaerobic digestion process using food waste with different compositions

Rafieenia, Razieh; Girotto, Francesca; Peng, Wei; Cossu, Raffaello; Pivato, Alberto; Raga, Roberto; Lavagnolo, Maria Cristina

doi:10.1016/j.wasman.2016.10.028

Cited by 121 publications

(32 citation statements)

References 34 publications

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“…Since no research findings on aerobic pre-treatment of O. ficus indica feedstock are available, no direct comparison can be made. Nevertheless, various researchers have reported increase in methane content in biogas with the incorporation of aerobic process in anaerobic digestion (Rafieenia et al, 2017;Jang et al, 2014;Ahn et al, 2014). Results obtained in this study differ a bit from those of Ahn et al (2014), who worked on anaerobic digestion of aerobic pretreated sewage sludge samples and obtained the highest methane yield after 24 h of pretreatment.…”

Section: Effect Of Aeration Pretreatment On Methane Yieldscontrasting

confidence: 84%

Enhancement of anaerobic batch digestion of spineless cacti (Opuntia ficus indica) feedstock by aerobic pre-treatment

Myovela¹,

Mshandete²,

Imathiu³

2019

Afr. J. Biotechnol.

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One of the best options for African countries to meet rural energy needs is to grow carefree crassulacean acid metabolism plants on a massive scale in waste lands. This can enable bioenergy production without disrupting food supplies and hence sustainable energy supply for the future. Opuntia ficus indica is an ideal plant for arid regimes but has barely been studied as a potential bioenergy source. This study investigated the effect of aerobic pretreatment on methane yield of O. ficus indica biomass. This effect was investigated in batch bioreactors which were exposed to aerobic conditions by varying time from 3 to 72 h before the start of anaerobic digestion. Reducing sugar content and dissolved oxygen levels after pretreatment period was analyzed. Reducing sugar content in bioreactors increased with increase in pretreatment time from 12.22 ±0.69 to 59.08 ± 5.35 g/L in the untreated and 72 h pretreated batches, respectively. Methane yields after pretreatment were observed to range from 0.286 to 0.702 L/kg volatile solids at 9 and 72 h of pre-treatment, respectively. A 9 h pretreatment of feedstock prior to anaerobic digestion yielded 123% higher methane yield when compared to that without pre-treatment. The findings that there was an increase in reducing sugar production and methane yield at 9 h of aerobic pre-treatment suggests that there was increased hydrolysis with pretreatment. Hence, short pre-treatment period could be an option to increasing solubilization of cladodes and promoting methane productivity. Therefore, pre-aeration of O. ficus indica, was shown to be an effective method for enhancing both its digestibility and improved methane yield during anaerobic digestion.

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Section: Effect Of Aeration Pretreatment On Methane Yieldscontrasting

confidence: 84%

Enhancement of anaerobic batch digestion of spineless cacti (Opuntia ficus indica) feedstock by aerobic pre-treatment

Myovela¹,

Mshandete²,

Imathiu³

2019

Afr. J. Biotechnol.

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“…While aeration decreased the hydrogen production from FW by 19-33%, methane production increased for protein-rich (+31.5%) and carbohydrate-rich FW (+6%). [60]. On the contrary, significantly increased hydrogen yields were reported by including microaeration into a hydrogen-producing hydrolysis stage.…”

Section: Combined Pretreatmentmentioning

confidence: 99%

Role of Microbial Hydrolysis in Anaerobic Digestion

2020

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There is a growing need of substrate flexibility for biobased production of energy and value-added products that allows the application of variable biodegradable residues within a circular economy. It can be used to balance fluctuating energy provision of other renewable sources. Hydrolysis presents one of the biggest limitations during anaerobic digestion. Methods to improve it will result in broader process applicability and improved integration into regional material cycles. Recently, one focus of anaerobic digestion research has been directed to systems with a separate hydrolysis–acidogenesis stage as it might be promised to improve process performance. Conditions can be adjusted to each class of microorganisms individually without harming methanogenic microorganisms. Extensive research of separate biomass pretreatment via biological, chemical, physical or mixed methods has been conducted. Nevertheless, several methods lack economic efficiency, have a high environmental impact or focus on specific substrates. Pretreatment via a separate hydrolysis stage as cell-driven biotransformation in a suspension might be an alternative that enables high yields, flexible feeding and production, and a better process control. In this review, we summarize existing technologies for microbial hydrolytic biotransformation in a separate reactor stage and the impacts of substrate, operational parameters, combined methods and process design as well as remaining challenges.

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“…Hydrolysis is considered to be the rate-limiting step. Numerous pre-treatment methods, including thermal/hydrothermal (Ding et al, 2017), ultrasonic (Elbeshbishy and Nakhla, ACCEPTED MANUSCRIPT 2011), alkali or acid (Zhao et al, 2011), autoclaving (Tampio et al, 2014), microwaving (Shahriari et al, 2013), freezing/thawing (Stabnikova et al, 2008b), micro aeration (Rafieenia et al, 2017), and high voltage pulse discharge (Zou et al, 2016), were studied to promote FW hydrolysis and thus enhance methane production. Nevertheless, the application of these methods is restricted because of factors including by-products (e.g.…”

Section: Additives To Promote Rate-limiting Hydrolysismentioning

confidence: 99%

Improving the stability and efficiency of anaerobic digestion of food waste using additives: A critical review

Liu

et al. 2018

Journal of Cleaner Production

227

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Anaerobic digestion is an effective technology to treat food waste, with methane production as renewable bioenergy. However, there are two key problems in the practical application, i.e., poor system stability and low reactor efficiency. In this paper, additives used in anaerobic digestion of food waste were systematically reviewed in view of system stability and reactor efficiency. Enzymes showed excellent property in food waste pre-hydrolysis stage with almost all macromolecular matters being rapidly resolved. Fungi fermentation process to produce hydrolytic enzymes, can be regarded as a promising and low-cost way to realize rate-limiting step elimination. It can be also concluded that adding neutralizers, buffer chemicals and some other materials is effective to maintain the pH level for practical application. Trace metals in food waste are not enough but needed for methanogens activation in long term and high loading rate operation. In addition, direct interspecies electron transfer could be much helpful for intermediate refractory organic acids degradation and methanogenesis promotion with additives of conductive materials, which is also discussed and should be studied further in anaerobic digestion of food waste. Based on literature review, a new concept is proposed for further study, suggesting that after being well liquefied with enzyme pre-hydrolysis, food waste could be co-digested with landfill leachate in a high-rate anaerobic reactor stably, resulting in a high bioenergy recovery efficiency.

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Effect of aerobic pre-treatment on hydrogen and methane production in a two-stage anaerobic digestion process using food waste with different compositions

Cited by 121 publications

References 34 publications

Enhancement of anaerobic batch digestion of spineless cacti (Opuntia ficus indica) feedstock by aerobic pre-treatment

Enhancement of anaerobic batch digestion of spineless cacti (Opuntia ficus indica) feedstock by aerobic pre-treatment

Role of Microbial Hydrolysis in Anaerobic Digestion

Improving the stability and efficiency of anaerobic digestion of food waste using additives: A critical review

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