Green biomass to biogas – A study on anaerobic digestion of residue grass

Bedoić, Robert; Čuček, Lidija; Ćosić, Boris; Krajnc, Damjan; Smoljanić, Goran; Kravanja, Zdravko; Ljubas, Davor; Pukšec, Tomislav; Duić, Neven

doi:10.1016/j.jclepro.2018.12.224

Cited by 105 publications

(44 citation statements)

References 32 publications

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“…Green biomass streams consists of living, herbaceous, and wet biomass like grasses and clover (Bedoic et al, 2019). Grasses can be sourced from, i.a., pasture lands, roadside cuttings, and (private) gardens and parks.…”

Section: Green Biomassmentioning

confidence: 99%

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Modeling Biowaste Biorefineries: A Review

Buck

Polańska

Impe

2020

Front. Sustain. Food Syst.

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The biorefining of biowaste is an upcoming novel strategy, but is mostly still in its conceptual phase. Biowaste biorefineries would allow (rural) communities to convert their biowaste into value-added biofuels, biochemical compounds, and fertilizers. Several different types of biowaste biorefineries have already been developed, but little to none of these designs are already commercially exploited. Their further development and commercial implementation is hampered by the high investment costs and risks, little trusts in its novel technologies, expected yields and profits, and operating reliability. Modeling these integrated processes, together with their supply chains, would allow for optimizing the considered biorefinery designs and coincidently speeding up the R&D-process. The optimized biorefinery designs and supply chains would additionally embed an increased amount of trust in potential investors in terms of the economic sustainability of the considered novel processes. Therefore, in this publication, a summary of existing biorefinery models is presented, together with supply chain network models. The discussed biorefinery models are categorized according to the conversion platform they use, being thermochemical, biological, or hybrid ones. Furthermore, the overall inherent advantages and disadvantages of all conversion platforms are summarized and a scope of further research needs is presented.

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Section: Green Biomassmentioning

confidence: 99%

“…Rhizobia are capable of fixating atmospheric nitrogen, and thus fertilizing the soil. Harvested grasses and clovers can be used as fodder but a large fraction remains underused (Kamm et al, 2016;Bedoic et al, 2019).…”

Section: Green Biomassmentioning

confidence: 99%

Modeling Biowaste Biorefineries: A Review

Buck

Polańska

Impe

2020

Front. Sustain. Food Syst.

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“…As laboratory results are not flexible enough to assimilate the real experimental conditions, some Mediterranean experiences were taken as reference points in order to remain as close as possible in terms of the similarity of the collected biowaste, particularly with regard to FW [70,71]. To this end, some research works that were achieved in Spain, Italy, Turkey, France, and Greece were reviewed to investigate the feasibility of FW and CM anaerobic co-digestion [72][73][74].…”

Section: Calculated Parameters Unit Amountmentioning

confidence: 99%

Potential of Sustainable Concept for Handling Organic Waste in Tunisia

et al. 2020

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Nowadays, Tunisia is seeking to implement cost-efficient and sustainable solutions in relation to the treatment of organic waste which, at up to 65%, makes up the largest proportion of total waste generated in the country. Therefore, an efficient tool for decision makers is needed to provide a clear approach about the potential of organic waste as well as the treatment concept, which can be adapted based on technical requirements and local conditions. Results revealed that there is a high variation in terms of the nature of the collected biowaste, which affects the selection of the adopted bioprocess for each geographical zone of the study area. Three main categories of biowaste are produced along the coastline of Tunisia: food waste (FW) (102.543 t/a); green waste (GW) (1.326.930 t/a); and cattle manure (CM) (1.548.350 t/a). Based on the results of similar projects and laboratory-scale research work, anaerobic and aerobic digestion were examined. Regarding aerobic digestion, the monitoring of several physicochemical parameters ascertained that the co-composting of FW and GW at different ratios (GW: FW = 100:0, 75:25, 50:50, and 25:75) allowed the production of a stable and mature compost. A highly qualified end-product was generated from each trial categorized as a finished compost of class V with reference to German Standards of compost. Regarding the anaerobic process, different feedstock mixtures (FW:CM = 0:1, 1:1, 2:1, and 3:1) were prepared to feed semi-continuous anaerobic reactors. However, a significant improvement in the process development was recorded for digesters including a higher fraction of FW, which produced 0.846 LN/kg VSin as the maximum biogas production. Therefore, biological treatments of food waste and different co-substrates seems to be a suitable technique for Tunisia in terms of waste management, environmental, and energy aspects. However, the evaluation of the efficiency of the proposed biological treatments was also verified by a draw-up of a technical and economic feasibility analysis. Although the cost–benefit estimations proved that the profits from both the compost and biogas plants would be very modest, the feasibility of such sustainable projects should not only be evaluated on an economic basis, but also by taking into account socio-environmental considerations including decreasing environmental threats, providing work opportunities, increasing incomes, stimulating public awareness as well as reducing the operating costs linked to landfilling.

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“…In order to expand the supply of raw materials for biogas production, annual and perennial crops are currently being used to produce biogas. The mono-digestion of perennial grasses seems to be promising for the generation of biogas [20], although co-digestion of perennial grasses with manure might even more effective [19]. Perennial grasses have advantages over annual crops as a feedstock, because they are able to produce stable, high yields of dry matter under different environmental conditions and do not compete with food production for raw materials [21,22].…”

Section: Introductionmentioning

confidence: 99%

The effect of digestate and mineral fertilisation of cocksfoot grass on greenhouse gas emissions in a cocksfoot-based biogas production system

Tilvikienė¹,

Venslauskas²,

Povilaitis³

et al. 2020

Energ Sustain Soc

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Background: Climate mitigation is a major consideration when choosing bioenergy systems. Anaerobic digestion of biomass is a bioenergy system, which is normally used for the treatment of manure or other residues, but cultivated energy crops may also provide a potential feedstock. One of the main crops for biogas production is still maize, but it may be desirable to replace it by perennial grasses, which also have high yields, but do not require as much management. The aim of this study was to analyse greenhouse gas (GHG) emissions in a biogas production system based on a perennial grass, cocksfoot, grown under different fertiliser application systems. Methods: Field and laboratory experiments were carried out over a 7-year period to evaluate the influence of mineral nitrogen and digestate fertiliser application on cocksfoot biomass and biogas productivity. The obtained data were used to calculate GHG emissions and emission savings for the whole biogas production cycle, by use of the SimaPro v.8 software with the IMPACT 2002+ model, based on the climate change environmental impact category. Results: Productivity of cocksfoot (Dactylis glomerata L.) was influenced by the annual rate of nitrogen applied as fertiliser, the fertiliser type and year, as influenced by the weather conditions. The biomass yield of cocksfoot fertilised with 180 kg nitrogen ha −1 year −1 was similar regardless if the nitrogen was applied as digestate or mineral fertiliser. At higher rates of nitrogen application (360-450 kg ha −1 year −1), higher yields and lower net GHG emissions could be obtained from the biogas production cycle when the nitrogen was applied as digestate compared to mineral fertiliser, especially in dry years. Energy input over the whole cycle was mainly influenced by the type of fertiliser and the biomass yield. Mineral fertiliser generally caused higher levels of GHG emissions than organic digestate fertiliser, when the same amount of energy is produced. Conclusions: The cocksfoot grass-based biogas production system showed that a significant GHG emission saving potential exists, if nitrogen is added as digestate instead of mineral fertiliser, for similar yields of biomass and energy from biogas. Cocksfoot grass fertilised with digestate is thus a promising feedstock for biogas production.

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Green biomass to biogas – A study on anaerobic digestion of residue grass

Cited by 105 publications

References 32 publications

Modeling Biowaste Biorefineries: A Review

Modeling Biowaste Biorefineries: A Review

Potential of Sustainable Concept for Handling Organic Waste in Tunisia

The effect of digestate and mineral fertilisation of cocksfoot grass on greenhouse gas emissions in a cocksfoot-based biogas production system

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