Energy recovery from one- and two-stage anaerobic digestion of food waste

Gioannis, Giorgia De; Muntoni, Aldo; Polettini, Alessandra; Pomi, Raffaella; Spiga, Daniela

doi:10.1016/j.wasman.2017.06.013

Cited by 133 publications

(79 citation statements)

References 47 publications

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“…Assays are assessed using a broad pH range (4.5-9.0 [15,21]), with the optimum found at 5.5 [11,13,14]. In this matter, the most adopted methods of controlling pH during batch trials are the use of an initial buffer solution [6,[13][14][15] or the automatic addition of an alkaline solution [19][20][21]. Temperature is set at mesophilic (35-39 • C) or thermophilic conditions (50-55 • C), according to the original conditions of the seed microorganisms.…”

Section: Introductionmentioning

confidence: 99%

“…to avoid the presence of HCB [23][24][25][26][27][28][29]. Nevertheless, since in full scale digesters bacteria coexist in a wide range of species, and the fermentation of substrates into biohydrogen involves a wide consortium of microorganisms [30], the use of mixed cultures belonging to operative facilities is preferred by most authors [6,11,[13][14][15][16][17][18][19][20][21][31][32][33]. Moreover, using mixed-microorganism media is more functional and economically advantageous than using unique microbial populations.…”

Section: Introductionmentioning

confidence: 99%

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Biochemical Hydrogen Potential Tests Using Different Inocula

2019

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Four inocula collected from different operating facilities were tested in their hydrogenic performances by means of two biochemical hydrogen potential test set-ups using sucrose and food waste as substrates, with the aim of evaluating the influence of inoculum media in batch fermentative assays. The selected inocula were: activated sludge collected from the aerobic unit of a municipal wastewater treatment plant, digested sludge from an anaerobic reactor treating organic waste and cattle manure, digested sludge from an anaerobic reactor treating agroindustrial residues, and digested sludge from an anaerobic reactor of a municipal wastewater treatment plant. Test results, in terms of specific hydrogen production, hydrogen conversion efficiency, and volatile solids removal efficiency, were significantly dependent on the type of inoculum. Statistical analysis showed different results, indicating that findings were due to the different inocula used in the tests. In particular, assays performed with activated sludge showed the highest performances for both substrates and both experimental set-ups.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biochemical Hydrogen Potential Tests Using Different Inocula

2019

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“…In the case of a substrate with a natural inhibitor, like citrus waste, the two-stage system offers another advantage by retaining part of the inhibitor in the first stage and secluding it from the second stage that contains the more sensitive methanogenic bacteria. A study by Gioannis et al [9], which utilized food waste for biogas production, supported this notion. It was shown that through a two-stage process, where the first reactor is properly operated in order to achieve a significant net hydrogen production, a 20% higher methane yield was obtained, compared to that of a single-stage process.…”

Section: Introductionmentioning

confidence: 92%

Semi-Continuous Reverse Membrane Bioreactor in Two-Stage Anaerobic Digestion of Citrus Waste

et al. 2018

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The presence of an antimicrobial compound called D-Limonene in citrus waste inhibits methane production from such waste in anaerobic digestion. In this work, a two-stage anaerobic digestion method is developed using reverse membrane bioreactors (rMBRs) containing cells encased in hydrophilic membranes. The purpose of encasement is to retain a high cell concentration inside the bioreactor. The effectiveness of rMBRs in reducing cell washout is evaluated. Three different system configurations, comprising rMBRs, freely suspended cells (FCs), and a combination of both (abbreviated to rMBR–FCs), are incubated at three different organic loading rates (OLRs) each, namely 0.6, 1.2, and 3.6 g COD/(L cycle). Incubation lasts for eight feeding cycles at 55 °C. Methane yield and biogas composition results show that rMBRs perform better than rMBR–FCs and FCs at all three OLRs. Volatile fatty acid profiles and H2 production show that the reactors are working properly and no upset occurs. Additionally, a short digestion time of 4 days can be achieved using the rMBR configuration in this study.

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“…The first-order models known as the simplest model was applied to estimate the parameter, to improve the understanding of the biological process and predict the behaviour of the biological system in developing the anaerobic system [17]. The modified Gompertz model has been adopted to analyse the production of methane from batch experiments [18,19].…”

Section: Introductionmentioning

confidence: 99%

Energy Recovery from Anaerobic Digestion of Banana Peels

Shaharoshaha¹,

Sulaiman²,

Seswoya³

2019

IJRTE

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Bananas are tropical fruits mostly eaten in Malaysia. The banana peels are high in organic, and putrescible caused the odour and leachate problem where it has been a dump. In practice, banana peels considered as a waste product that has been combined with municipal solid waste and dumped into the landfills. However, banana peels are bountiful in organic matter and high with moisture content. Thus, it could be a convincing substrate for biogas production through anaerobic digestion so that the major concerns of environmental protection is achieved aside from producing energy in a sustainable way. Therefore, this study was initiated to estimate the ultimate methane yield from the unripe banana peel (UBP) and ripe banana peel (RBP). Besides that, the assessment on the kinetics of the methane production from UBP and RBP is conducted using Modified Gompertz and first-order kinetic modelling. In this study, the anaerobic digestibility of banana peels measured in a batch reactor for 25 days each fed by UBP and RBP. The batch reactors operated at an inoculum to substrate ratio (I/S) of 1.0 and at a mesophilic temperature (37°C). The ultimate methane yields from UBP and RBP digestion were 847.57mLCH4 /gVS and 1405.31mLCH4 /gVS, respectively. The higher bioavailability (in term of COD, and solid) in RBP resulted in the higher methane production rate. Two first-order and modified Gompertz kinetic models were compared for the prediction of organic degradation, and the results indicated that the first-order kinetic model of the RBP fitted the experiment best. It concluded that ripe banana peels are the most preferable feedstock for the anaerobic digestion.

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Energy recovery from one- and two-stage anaerobic digestion of food waste

Cited by 133 publications

References 47 publications

Biochemical Hydrogen Potential Tests Using Different Inocula

Biochemical Hydrogen Potential Tests Using Different Inocula

Semi-Continuous Reverse Membrane Bioreactor in Two-Stage Anaerobic Digestion of Citrus Waste

Energy Recovery from Anaerobic Digestion of Banana Peels

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