Enzymatic processing of municipal solid waste

Jensen, J.; Felby, Claus; Jørgensen, Henning; Rønsch, Georg Ørnskov; Nørholm, Nanna Dreyer

doi:10.1016/j.wasman.2010.07.009

Cited by 29 publications

(19 citation statements)

References 24 publications

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“…This indicates that the enzymatic saccharification not only improves ethanol production by increasing the concentration of glucose, but also-by reducing the viscosity of the slurry-facilitates the better growth of the yeast, which is a result of the collapse of the crystal structure of cellulose, giving reduced water-binding capacity [45]. Also, it has been demonstrated that during liquefaction of model municipal solid waste among the different enzymes that were tested, it was cellulases that were responsible for viscosity reduction [46]. It was also observed that ethanol concentration in both trials that ethanol concentration gradually decreased after 21 h of fermentation.…”

Section: Discussionmentioning

confidence: 99%

Ethanol Production from Enzymatically Treated Dried Food Waste Using Enzymes Produced On-Site

Μάτσακας

Christakopoulos

2015

Sustainability

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Abstract:The environmental crisis and the need to find renewable fuel alternatives have made production of biofuels an important priority. At the same time, the increasing production of food waste is an important environmental issue. For this reason, production of ethanol from food waste is an interesting approach. Volumes of food waste are reduced and ethanol production does not compete with food production. In this work, we evaluated the possibility of using source-separated household food waste for the production of ethanol. To minimize the cost of ethanol production, the hydrolytic enzymes that are necessary for cellulose hydrolysis were produced in-house using the thermophillic fungus Myceliophthora thermophila. At the initial stage of the study, production of these thermophilic enzymes was studied and optimized, resulting in an activity of 0.28 FPU/mL in the extracellular broth. These enzymes were used to saccharify household food waste at a high dry material consistency of 30% w/w, followed by fermentation. Ethanol production reached 19.27 g/L with a volumetric productivity of 0.92 g/L·h, whereas only 5.98 g/L of ethanol was produced with a volumetric productivity of 0.28 g/L·h when no enzymatic saccharification was used.

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Section: Discussionmentioning

confidence: 99%

Ethanol Production from Enzymatically Treated Dried Food Waste Using Enzymes Produced On-Site

Μάτσακας

Christakopoulos

2015

Sustainability

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“…The retention time was about 10-16 hour. A detailed description of the enzymatic processing can be found in (20). After the second reactor, the liquid phase was separated from the remaining solids by a vibrating sieve.…”

Section: Waste Refinerymentioning

confidence: 99%

“…For example, source-segregated organic household waste may still contain impurities and need further pre-treatment prior to biological conversion. This may lead to considerable losses of mass, energy, and nutrients as recently documented (20). Mechanicalbiological treatment (MBT) of waste addresses a similar problem as the waste refineries by combining a range of mechanical operations for separating the organic fraction from the incoming mixed waste (21)(22)(23)(24)(25)(26)(27).…”

Section: Introductionmentioning

confidence: 99%

Material Resources, Energy, and Nutrient Recovery from Waste: Are Waste Refineries the Solution for the Future?

Tonini¹,

Martinez-Sanchez²,

Astrup³

2013

Environ. Sci. Technol.

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Waste refineries focusing on multiple outputs of material resources, energy carriers, and nutrients may potentially provide more sustainable utilization of waste resources than traditional waste technologies. This consequential life cycle assessment (LCA) evaluated the environmental performance of a Danish waste refinery solution against state-of-the-art waste technology alternatives (incineration, mechanical-biological treatment (MBT), and landfilling). In total 252 scenarios were evaluated, including effects from source-segregation, waste composition, and energy conversion pathway efficiencies. Overall, the waste refinery provided global warming (GW) savings comparable with efficient incineration, MBT, and bioreactor landfilling technologies. The main environmental benefits from waste refining were a potential for improved phosphorous recovery (about 85%) and increased electricity production (by 15-40% compared with incineration); albeit at the potential expense of additional toxic emissions to soil.Society's need for the outputs from waste, i.e. energy products (electricity vs. transport fuels) and resources (e.g., phosphorous), and the available waste composition were found decisive for the selection of future technologies. Based on the results, it is recommended that a narrow focus on GW aspects should be avoided as most waste technologies may allow comparable performance.Rather, other environmental aspects such as resource recovery and toxic emissions should receive attention in the future.3

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“…The retention time was about 10-16 hours. A detailed description of the enzymatic processing can be found in [32]. After the second reactor, the liquid phase was separated from the remaining solid fraction by a vibrating sieve.…”

Section: The Waste Refinery Processmentioning

confidence: 99%

Bioenergy, material, and nutrients recovery from household waste: Advanced material, substance, energy, and cost flow analysis of a waste refinery process

2014

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Enzymatic processing of municipal solid waste

Cited by 29 publications

References 24 publications

Ethanol Production from Enzymatically Treated Dried Food Waste Using Enzymes Produced On-Site

Ethanol Production from Enzymatically Treated Dried Food Waste Using Enzymes Produced On-Site

Material Resources, Energy, and Nutrient Recovery from Waste: Are Waste Refineries the Solution for the Future?

Bioenergy, material, and nutrients recovery from household waste: Advanced material, substance, energy, and cost flow analysis of a waste refinery process

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