Strategies for the anaerobic digestion of the organic fraction of municipal solid waste: an overview

Hartmann, Hinrich; Ahring, Birgitte Kiær

doi:10.2166/wst.2006.231

Cited by 244 publications

(123 citation statements)

References 33 publications

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“…Low lipid content (4.9 g/100 g) had been reported from a MSW sample derived from food wastes emanating from fruit and vegetable markets, households, hotels and juice production centers [33]. Generally, MSW that contains waste food materials have a higher lipid content than those which are derived from wood and paper [34,35]. The protein and total nitrogen concentrations of this MSW sample were similar to those reported by Ponsá et al and Rao et al [32,33].…”

Section: Composition Of Mswsupporting

confidence: 82%

Optimizing Cellulase Production from Municipal Solid Waste (MSW) using Solid State Fermentation (SSF)

Abdullah

Greetham

Pensupa

et al. 2016

J Fundam Renewable Energy

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This paper explores the possibility of using an industrially processed municipal solid waste (MSW) for cellulase enzyme production via solid state fermentation (SSF) by Trichoderma reesei and Aspergillus niger. Both fungi grew well on the MSW substrate and production of cellulase enzymes was optimized for temperature, moisture content, inoculation and period of incubation. The effect of additional minerals, and alternative carbon and nitrogen sources were also examined.Following optimization a cellulase activity of 26.10 ± 3.09 FPU/g could be produced using T. reesei at 30°C with a moisture content of 60% with an inoculums of 0.5 million spores/g and incubation for 168 hours. Addition of extra nitrogen and/or carbon did not improve cellulase accumulation. Acid or alkali pretreatment of MSW led to reduced cellulase production. Crude enzymes produced from MSW by T. reesei were evaluated for their ability to release glucose from MSW. A cellulose hydrolysis yield of 24.7% was achieved, which was close to that obtained using a commercial enzyme. Results demonstrated that MSW can be used as an inexpensive lignocellulosic material for the production of cellulase enzymes. Research has revealed that T. reesei can produce 13.4 FPU/g cellulase activity using water hyacinth [8]; 154.58 FPU/g using sugar cane bagasse [10]; 8.2 FPU/g using oil palm empty fruit bunches [11]; and 1.16 FPU/g using rice bran [12] as substrates. Similarly it has been reported that A. Niger could produce 24 FPU/g cellulase activity using wheat straw as a substrate [13]. Other substrates such as banana peel, rice straw, corn cob residue, rice husk, banana fruit stalk, and coconut coir pith have all being used for cellulase production [14,15]. Optimizing Cellulase Production fromAlthough MSW can contain a high lignocellulosic content, there has been limited research into the use of MSW for cellulase production. Other research demonstrated the possibility of using MSW to produce cellulase via SSF. But by using raw not autoclave MSW [16,17]. In this paper, we report an example of using an industrially processed MSW for cellulase production and then the use of the resulting "cellulase cocktail" for the enzymatic hydrolysis of MSW. Materials and Methods Municipal solid wasteMunicipal solid waste (MSW) was kindly supplied by Wilson Steam Storage Ltd (UK). The MSW had been subjected to commercial steam 15 min, respectively. After autoclaving, samples were neutralized to pH 7.0 using either 1 M NaOH or 1 M H 2 SO 4 as appropriate. The samples were then centrifuged at 5000 rpm (4472 g) for 10 min. The solid fraction (pellet) was rinsed three times by adding distilled water to the pellet and re-centrifuged. The solid fraction was then dried overnight at room temperature. Journal of Fundamentals of Renewable Energy and ApplicationsMicroorganisms: Two filamentous fungi, Trichoderma reesei QM6a and Aspergillus niger N402 were kindly donated by Professor David Archer (University of Nottingham, UK). Procedures for storing and cultivating T. reesei and A. n...

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Section: Composition Of Mswsupporting

confidence: 82%

Optimizing Cellulase Production from Municipal Solid Waste (MSW) using Solid State Fermentation (SSF)

Abdullah

Greetham

Pensupa

et al. 2016

J Fundam Renewable Energy

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“…Although rich in energy-yielding compounds this may not be a well-balanced mix for anaerobic digestion. Maintaining a suitable carbon to nitrogen ratio is essential for sustainable digestion, with the optimum in the range of 25-30 [10]. In the case of feedstocks with an unfavourable C/N ratio, studies suggest that co-digestion with other substrates that have complementary nutrient characteristics can improve process performance [11].…”

Section: Introductionmentioning

confidence: 99%

Strategies for stable anaerobic digestion of vegetable waste

2012

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International trade and the market demand for pre-prepared agricultural produce is not only increasing the total quantity of waste agricultural biomass but also centralising its availability, making it potentially useful for energy production. The current work considers the suitability of vegetable trimmings and rejects from high-value produce air-freighted between Africa and Europe as a feedstock for anaerobic digestion. The physical and chemical characteristics of a typical mixed vegetable waste of this type were determined and the theoretical energy yield predicted and compared to experimentally-determined calorific values, and to the energy recovered through a batch biochemical methane potential test. A semi-continuous digestion trial was then carried out with daily feed additions at different organic loading rates (OLR). At an OLR of 2 g VS L -1 day -1 the substrate gave a methane yield of 0.345 L g -1 VS added with VS destruction 81.3%, and showed that 76.2% of the measured calorific value of the waste could be reclaimed as methane. This was in good agreement with the estimated energy recovery of 68.6% based on reaction stoichiometry, and was 99% of the biochemical methane potential (BMP). Higher loading rates reduced the specific methane yield and energy conversion efficiency, and led to a drop in digester pH which could not be effectively controlled by alkali additions. To maintain digester stability it was necessary to supplement with additional trace elements including tungsten, which allowed loading rates up to 4 g VS L -1 day -1 to be achieved. Stability was also improved by addition of yeast extract (YE), but the higher gas yield obtained was as a result of the contribution made by the YE and no synergy was shown. Co-digestion using card packaging and cattle slurry as co-substrates also proved to be an effective means of restoring and maintaining stable operating conditions.

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“…These waste types can be separated at source and used as substrates for biogas production (Hartmann and Ahring, 2006;Mata-Alvarez et al, 1990). A major challenge of anaerobic digestion of food and green wastes is pH stability which may occur because of the differential biodegradation rates of the substrates (Bolzonella et al, 2006;Mata-Alvarez et al, 2000;Kayhanian, 1995).…”

Section: Introductionmentioning

confidence: 99%

Optimisation Study on the Production of Anaerobic Digestate Compost for Application on Arable Soils

Abdullahi

Suleiman

Akunna³

2011

Bayero J. Pure App. Sci.

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Organic fraction of municipal solid waste (OFMSW) is a rich substrate for biogas and compost production. Anaerobic Digestate compost (ADC) is an organic fertilizer produced from stabilized residuals of anaerobic digestion of OFMSW. This paper reports the result of studies carried out to optimise the production of ADC from organic fractions of domestic wastes and the effects of ADC amendments on soil quality. In general, ADC amended soils showed greater bioactivity and soil biomass compared to unamended soils. The diversity of soil community structures also increased with increasing ADC amendments with fungal populations showing greater variation than bacteria, suggesting that ADC amendment has greater impact on fungi than bacteria. It was found that seed germination in ADC amended soils increased with dilution and incubation time, suggesting that lower ADC application rates and longer lag periods between soil applications and planting can improve the benefits of ADC as an amendment for arable soil.

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Strategies for the anaerobic digestion of the organic fraction of municipal solid waste: an overview

Cited by 244 publications

References 33 publications

Optimizing Cellulase Production from Municipal Solid Waste (MSW) using Solid State Fermentation (SSF)

Optimizing Cellulase Production from Municipal Solid Waste (MSW) using Solid State Fermentation (SSF)

Strategies for stable anaerobic digestion of vegetable waste

Optimisation Study on the Production of Anaerobic Digestate Compost for Application on Arable Soils

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