Promoting circular economy in the surroundings of an organic fraction of municipal solid waste anaerobic digestion treatment plant: Biogas production impact and economic factors

Abad, Vanessa; Avila, Romina; Vicent, Teresa; Font, Xavier

doi:10.1016/j.biortech.2019.03.064

Cited by 95 publications

(69 citation statements)

References 18 publications

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“…In order to surpass this adversity, EFP that contain high amounts of soluble organic material and COD content, were introduced in the feedstock of the digesters. Co-digestion was proposed as a management solution, for the simultaneous valorisation of a not easily degradable waste stream (DN) and the waste stream (food waste) that represents the highest percentage among the Municipal Solid Wastes (Abad et al, 2019). Gaseous biofuels production was monitored in order to draw comparative conclusions on the efficiency of each configuration.…”

Section: Discussionmentioning

confidence: 99%

Used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion

et al. 2020

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Section: Discussionmentioning

confidence: 99%

Used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion

et al. 2020

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“…Thermochemical processes are based on gasification [2] or pyrolysis [3] of biomass to obtain energy and biofuels [4,5]. Biological processes are based on bacterial, or in some cases, algal fermentation to obtain ethanol from sugary biomass [6] or biogas from water-rich organic material [7]. In particular, the production of biogas from anaerobic digestion has become widespread in Europe.…”

Section: Introductionmentioning

confidence: 99%

Biogas from Anaerobic Digestion: Power Generation or Biomethane Production?

et al. 2020

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Biogas is a fuel obtained from organic waste fermentation and can be an interesting solution for producing electric energy, heat and fuel. Recently, many European countries have incentivized the production of biomethane to be injected into natural gas grids or compressed and used as biofuel in vehicles. The introduction of an upgrading unit into an existing anaerobic digestion plant to convert biogas to biomethane may have a strong impact on the overall energy balance of the systems. The amount of biomethane produced may be optimized from several points of view (i.e., energy, environmental and economic). In this paper, the mass and energy fluxes of an anaerobic digestion plant were analyzed as a function of the biogas percentage sent to the upgrading system and the amount of biomethane produced. A numerical model of an anaerobic digestion plant was developed by considering an existing case study. The mass and energy balance of the digesters, cogeneration unit, upgrading system and auxiliary boiler were estimated when the amount of produced biomethane was varied. An internal combustion engine was adopted as the cogeneration unit and a CO 2 absorption system was assumed for biogas upgrading. Results demonstrated that the energy balance of the plant is strictly dependent on the biomethane production and that an excess of biomethane production makes the plant totally dependent on external energy sources. As for the environmental impact, an optimal level of biomethane production exists that minimizes the emissions of equivalent CO 2 . However, high biomethane subsides can encourage plant managers to increase biomethane production and thus reduce CO 2 savings.

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“…Notwithstanding the different origin of the starting materials, all the three mixtures presented excellent physical properties, with values comparable to an ideal growing media [63,64] (Table 5). Bulk Density (BD) and Total Pore Space (TPS) were comparable to values found in digestates as a constituent for growing media by Nesse et al (2018) [65].…”

Section: Digestate-based Mixtures Quality Evaluation For Land Applicamentioning

confidence: 99%

Evaluation of MSW Compost and Digestate Mixtures for a Circular Economy Application

et al. 2020

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In order to obtain a product with agronomic characteristics and biological stability consistent with the EU fertilizer decree for the market of EU fertilising products three different mixtures obtained from sludge digestate from municipal wastewater treatment plant, fresh compost and mature compost have been studied and characterized. For the experimental activity, the raw samples and three mixing ones were collected for the analytical characterization. The biological stability was then assessed for all samples using different stability criteria such as Specific Oxygen Uptake Rate, Rottegrad self-heating factor, Residual biogas potential. Specific enzymatic tests provided information about the status of nutrient cycles (C, P and S) and to overall microbial activity. Physical (bulk density, particle density, air capacity and water content), nutritional (C, N, P, K, Mg, and Ca) and toxicological properties (seedling growth tests on Lepidum sativum L., Cucumis sativus L., Lolium perenne L.) were also evaluated in order to assess the feasibility of agronomic use of the digestate-based mixtures. All the digestate-based mixtures responded to the main characteristics of compost quality requirements proposed in national and international regulations. The evidence found in this study highlighted that the strategy of mixing of sludge digestates with the composts allowed to mitigate the environmental risk posed by each starting material and to valorize their nutrient content.

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Promoting circular economy in the surroundings of an organic fraction of municipal solid waste anaerobic digestion treatment plant: Biogas production impact and economic factors

Cited by 95 publications

References 18 publications

Used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion

Used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion

Biogas from Anaerobic Digestion: Power Generation or Biomethane Production?

Evaluation of MSW Compost and Digestate Mixtures for a Circular Economy Application

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