A methodology for optimising feed composition for anaerobic co-digestion of agro-industrial wastes

Álvarez, J.A.; Otero, Lidia Gil; Lema, Juan M.

doi:10.1016/j.biortech.2009.09.061

Cited by 248 publications

(87 citation statements)

References 23 publications

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“…and macro-nutrients (high C to N ratio); recent studies have indicated the optimal C to N ratio to be between 16-20 (36-38) and have demonstrated how a sub-optimal concentration of selected micro-nutrients may lead to process failure (36). Co-digestion with nutrients-rich substrates such as the organic fraction of municipal solid waste or manure may solve these problems (36,37). In addition, manure represents one of the most abundant domestically available biomass resources for Denmark (about 23-34 PJ) which is only to a minor extent (6% of the potential) exploited for energy production (39).…”

Section: Anaerobic Digestionmentioning

confidence: 99%

Bioenergy Production from Perennial Energy Crops: A Consequential LCA of 12 Bioenergy Scenarios including Land Use Changes

Tonini

Hamelin

Wenzel

et al. 2012

Environ. Sci. Technol.

106

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In the endeavor of optimizing the sustainability of bioenergy production in Denmark, this consequential life cycle assessment (LCA) evaluated the environmental impacts associated with the production of heat and electricity from one hectare of Danish arable land cultivated with three perennial crops: ryegrass (Lolium perenne), willow (Salix viminalis) and Miscanthus giganteus. For each, four conversion pathways were assessed against a fossil fuel reference: I) anaerobic co-digestion with manure, II) gasification, III) combustion in small-to-medium scale biomass combined heat and power (CHP) plants and IV) co-firing in large scale coal-fired CHP plants. Soil carbon changes, direct and indirect land use changes as well as uncertainty analysis (sensitivity, MonteCarlo) were included in the LCA. Results showed that global warming was the bottleneck impact, where only two scenarios, namely willow and Miscanthus co-firing, allowed for an improvement as compared to the reference (-82 and -45 t CO 2 -eq. ha -1 , respectively). The indirect land use changes impact was quantified as 310 ±170 t CO 2 -eq. ha -1 , representing a paramount average of 41% of the induced greenhouse gas emissions. The uncertainty analysis confirmed the results robustness and highlighted the indirect land use changes uncertainty as the only uncertainty that can significantly change the outcome of the LCA results.3

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Section: Anaerobic Digestionmentioning

confidence: 99%

Bioenergy Production from Perennial Energy Crops: A Consequential LCA of 12 Bioenergy Scenarios including Land Use Changes

Tonini

Hamelin

Wenzel

et al. 2012

Environ. Sci. Technol.

106

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“…This is a by-product of biodiesel production that contains approximately 50-60% glycerol, 12-16% alkali soaps and hydroxides, 15-18% methyl-ethers, 8-12% methanol and 2-3% water. With the development of the biodiesel industry, a surplus of crude glycerol is foreseen, but it has been tested mostly as a substrate for methane production (Álvarez et al, 2010;Fountoulakis and Manios, 2009;Lopez et al, 2009;Yang et al, 2008), and only a few studies have addressed glycerol application as a potentially inexpensive carbon and electron source for SRB growth (Dinkel et al, 2010;Qatibi, 1990). Therefore, this work initially sought to assess the performance of two different bioreactors treating sulfate-laden waters: (i) an UASB reactor, which has a simple and inexpensive design and does not require a supporting material for bacterial growth, and (ii) a FB reactor, in which activated carbon was utilized as support.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Uasb and Fluidized-Bed Reactors for Sulfate Reduction

Bertolino

Silva

Aquino

et al. 2015

Braz. J. Chem. Eng.

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-Reactor hydrodynamics is important for sulfidogenesis because sulfate reduction bacteria (SRB) do not granulate easily. In this work, the sulfate reduction performance of two continuous anaerobic bioreactors was investigated: (i) an upflow anaerobic sludge blanket (UASB) reactor and (ii) a fluidized bed reactor (FBR). Organic loading, sulfate reduction, and COD removal were the main parameters monitored during lactate and glycerol degradation. The UASB reactor with biomass recirculation showed a specific sulfate reduction rate of 0.089±0.014 g.gSSV -1 .d -1 (89% reduction), whereas values twice as high were achieved in the FBR treating either lactate (0.200±0.017 g.gSSV -1 .d -1 ) or glycerol (0.178±0.010 g.gSSV -1 .d -1 ). Sulfate reduction with pure glycerol produced a smaller residual COD (1700 mg.L -1 ) than that produced with lactate (2500 mg.L -1 ) at the same COD.sulfate -1 mass ratio. It was estimated that 50% of glycerol degradation was due to sulfate reduction and 50% to fermentation, which was supported by the presence of butyrate in the FBR effluent. The UASB reactor was unable to produce effluents with sulfate concentrations below 250 mg.L -1 due to poor mixing conditions, whereas the FBR consistently ensured residual sulfate concentrations below such a value.

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“…Literature data show that, during mesophilic fermentation, the VFA concentration should be in the range from 50 to 500 mg CH 3 COOH/L; alkalinity should be from 3.00 to 5.00 g CaCO 3 /L, while the reduction in COD should be within the limits of 65-85%, and pH value should be within the limits of 7.2-8.2 [8,9].…”

Section: Changes In the Physico-chemical Properties Of Sewage Sludge mentioning

confidence: 99%

Comparison of parameters co-fermentation process of municipal sewage sludge with excess sewage sludge from treated coking wastewater

Macherzyński

Włodarczyk‐Makuła

Ładyga

et al. 2017

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Comparison of parameters co-fermentation process of municipal sewage sludge with excess sewage sludge from treated coking wastewater Porównanie parametrów procesu kofermentacji mieszaniny osadów komunalnych z nadmiernymi osadami z oczyszczania ścieków koksowniczych AbstractThe study presents results concerning changes of physicochemical properties and biogas production during the co-digestion process. The sample constituted a mixture of raw and excess sludge that was inoculated and fermented. The sample is the abovementioned mixture with an addition of excess sewage. In the assumed test, the conditions of technological parameters of sewage sludge fermentation and its mixtures with sewage sludge coke did not differ from each other by more than 25% Therefore, excess sewage sludge from treated coking wastewater can be neutralized in the process of fermentation along with municipal sewage sludge provided a constant quality-quantitative control of sewage sludge and procedural parameters.Keywords: biogas, co-fermentation, sewage sludge, sewage sludge from treated coking wastewater Streszczenie W pracy przedstawiono wyniki badań dotyczące zmian właściwości fizyczno-chemicznych oraz produkcji biogazu podczas procesu kofermentacji. Próbkę kontrolną stanowiły osady komunalne zaszczepione przefermentowanymi. Próbka badana to mieszanina komunalnych z dodatkiem nadmiernych osadów koksowniczych. W przyjętych warunkach badań wartości parametrów technologicznych fermentacji osadów komunalnych oraz ich mieszaniny z osadami koksowniczymi nie różniły się od siebie więcej niż o 25%. Zatem osady koksownicze mogą być unieszkodliwiane w procesie fermentacji wraz z osadami komunalnymi pod warunkiem stałej kontroli jakościowo-ilościowej osadów i parametrów technologicznych.Słowa kluczowe: biogaz, kofermentacja, osady ściekowe, osady ze ścieków koksowniczych 156

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A methodology for optimising feed composition for anaerobic co-digestion of agro-industrial wastes

Cited by 248 publications

References 23 publications

Bioenergy Production from Perennial Energy Crops: A Consequential LCA of 12 Bioenergy Scenarios including Land Use Changes

Bioenergy Production from Perennial Energy Crops: A Consequential LCA of 12 Bioenergy Scenarios including Land Use Changes

Comparison of Uasb and Fluidized-Bed Reactors for Sulfate Reduction

Comparison of parameters co-fermentation process of municipal sewage sludge with excess sewage sludge from treated coking wastewater

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