Optimization of Solid State Anaerobic Digestion by inoculum recirculation: The case of an existing Mechanical Biological Treatment plant

Maria, Francesco Di; Sordi, Alessio; Micale, Caterina

doi:10.1016/j.apenergy.2011.12.093

Cited by 67 publications

(28 citation statements)

References 11 publications

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“…The lower biogas production for test 6 was a consequence of the higher TS concentration (Table 4), generating an increase in mass transfer resistance through the media [42]. Both biogas yield and its relation to TS content and process inoculation were in accordance with the data reported by other authors [4,12,[43][44][45].…”

Section: Experimental Testsupporting

confidence: 79%

Greenhouse Gas Emissions and Environmental Impact from Recycling the Organic Fraction of Solid Waste: Comparison of Different Treatment Schemes from a Life Cycle Perspective

Maria

Sisani

2017

Recycling

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Abstract:The emission of greenhouse gases and the impact from recycling the organic fraction of solid waste were investigated from a life cycle (LCA) perspective. Three different treatment schemes were investigated with the aid of a pilot apparatus including exclusively composting (COMP), integrated solid anaerobic batch not inoculated and post-composting (SADBPC), and an integrated solid anaerobic batch inoculated and post-composting (SADBPC-I). SADBPC-I and SADBPC generated an average of 300 NL/kgVS and 267 NL/kgVS of biogas, respectively. On the other hand, the amount of stabilized organic carbon contained in the organic fertilizer returned by COMP, SADBPC-I, and SADBPC led to a potential of 470 kgCO 2 eq /Mg, 382 kgCO 2 eq /Mg, and 545 kgCO 2 eq /Mg sequestered in soils for each treatment scheme, respectively. The LCA study highlighted that the impact categories most affected were global warming and human toxicity cancer, and on average, the highest impact was detected for COMP.

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Section: Experimental Testsupporting

confidence: 79%

Greenhouse Gas Emissions and Environmental Impact from Recycling the Organic Fraction of Solid Waste: Comparison of Different Treatment Schemes from a Life Cycle Perspective

Maria

Sisani

2017

Recycling

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“…Other SSAD studies also concluded that with a low substrate:inoculum ratio (1:3 or up to 25% TS), they obtained a higher methane yield, and low methane yields were observed at higher TS concentrations (Abbassi-Guendouz et al, 2012;Di Maria et al, 2012;Sun et al, 2016;Capson-Tojo et al, 2017). The TS content affects the mass transfer among gasliquid-solid phases and, consequently, the substrate degradation rate.…”

Section: Results Obtained From Central Composite Design For Effect Ofmentioning

confidence: 97%

Poultry Litter Solid State Anaerobic Digestion: Effect of Digestate Recirculation Intervals and Substrate/Inoculum Ratios on Process Efficiency

Marchioro

Steinmetz

Amaral

et al. 2018

Front. Sustain. Food Syst.

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This study evaluated the effect of the substrate:inoculum ratio and digestate recirculation conditions on the biogas and methane yield, free ammonia concentration and solid phase agronomic quality (after treatment) of poultry litter solid state anaerobic digestion (SSAD). Experimental tests were conducted using a central composite design (2²), with four trials at the factorial points and three at the central points, using poultry litter as substrate that was collected after 12 cycles of broiler production [TS 76% (w.w −1 )]. Three laboratory-scale reactors containing 3 kg of poultry litter each were operated at mesophilic conditions (37 • C) and seven experimental runs were performed at retention time of 30 days each. There were three substrate:inoculum ratios (1:1; 1:1.66, and 1:3) and three daily recirculation intervals (2, 3, and 4 times per day), and each recirculation event lasted 15 min. The highest biogas and methane yields were183 L Nbiogas .kg VSadd , respectively, and they were obtained at the substrate:inoculum ratio of 1:3 with a digestate recirculation frequency of four times a day. Digestate recirculation was the variable that influenced the concentration of free ammonia; the most frequently recirculated tests had lower concentrations (below 60 mgNH 3 .L −1 ). After the SSAD process, we identified a transfer of nutrients (N, P, K) from the solid phase to the liquid phase. The nutrient concentrations in the solid phase (N out = 11 g.kg −1 , K out = 5 g.kg −1 , and P out = 7 g.kg −1 ) indicated that the digested poultry litter still has potential for use in fertilization. In this study, it was estimated that 90 m 3 biogas .tons −1 poultrylitter was generated using SSAD. Whereas 100 tons of poultry litter are produced after 12 production cycles, the biogas generation capacity reaches 9,000 m 3 /year. In this scenario, farmers can use biogas from poultry litter SSAD as an additional source of energy.

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“…In spite of the recovery of additional resources and the range of possible energy recovery applications [20], MBT technologies increase system's complexity by adding inherent system losses, requiring additional energy consumption and representing a potential source of direct emissions. In particular, Di Maria et al [23] highlight that the changing composition of waste and the increased amount of OFMS causes two main negative effects in MBT plants based on aerobic process: (i) increase in energy consumption as a consequence of the increased need for process air; (ii) lower stabilization level of the organic material. For these reasons, an upgrading of the existing MBT plants is still called for and a further reduction and stabilization of the organic content of the OFMS along with a lower energy demand need to be pursued [23].…”

Section: Introductionmentioning

confidence: 99%

Refuse recovered biomass fuel from municipal solid waste. A life cycle assessment

et al. 2017

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Optimization of Solid State Anaerobic Digestion by inoculum recirculation: The case of an existing Mechanical Biological Treatment plant

Cited by 67 publications

References 11 publications

Greenhouse Gas Emissions and Environmental Impact from Recycling the Organic Fraction of Solid Waste: Comparison of Different Treatment Schemes from a Life Cycle Perspective

Greenhouse Gas Emissions and Environmental Impact from Recycling the Organic Fraction of Solid Waste: Comparison of Different Treatment Schemes from a Life Cycle Perspective

Poultry Litter Solid State Anaerobic Digestion: Effect of Digestate Recirculation Intervals and Substrate/Inoculum Ratios on Process Efficiency

Refuse recovered biomass fuel from municipal solid waste. A life cycle assessment

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