High solids anaerobic fermentation for biogas and compost production

Molnar, L.; Bartha, I.

doi:10.1016/0144-4565(88)90090-x

Cited by 44 publications

(9 citation statements)

References 3 publications

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“…The benefits of co-digestion for the anaerobic digestion process lies in such effects as improved nutrient balance, improved buffer capacity and improved rheological qualities of the substrate (Sosnowski et al, 2003;Molnar and Bartha, 1988;Mshandete et al, 2004). There are also potential economic advantages, such as the possibilities of utilizing free capacity in digesters in sewage treatment plants, and of using energy crops as co-substrates (Ahring et al, 1992;Tafdrup, 1995).…”

Section: Introductionmentioning

confidence: 98%

Anaerobic co-digestion of aquatic flora and quinoa with manures from Bolivian Altiplano

Alvarez

Lidén

2008

Waste Management

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Section: Introductionmentioning

confidence: 98%

Anaerobic co-digestion of aquatic flora and quinoa with manures from Bolivian Altiplano

Alvarez

Lidén

2008

Waste Management

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“…Moreover, the biodegradability and methane yield were greater at 55°C than 35°C (Jha et al, 2010a). The gradual decrease in temperature from 55°C to under 35°C resulted in a decrease in volumetric gas production rate from 2.53 to 0.7 m 3 d -1 in a 80 m 3 batch fermenter treating a mixture (C:N ratio of 16:1) of 25% beef cattle manure and 75% corn stalks with high solids concentration (approximately 27%) for 30 days (Molnar and Bartha, 1988). However, thermophilic condition performed well over mesophilic condition with higher rate of waste conversion (Juanga, 2005) and shorter retention time (Amani et al, 2011); it should be noted that an increase in methane yield from the thermophilic process has to be balanced against the increased energy requirement for maintaining the reactor at the higher temperature.…”

Section: Temperaturementioning

confidence: 99%

Research advances in dry anaerobic digestion process of solid organic wastes

Jha¹,

Li²,

Nies³

et al. 2011

Afr. J. Biotechnol.

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The dry anaerobic digestion process is an innovative waste-recycling method to treat high-solidcontent bio-wastes. This can be done without dilution with water by microbial consortia in an oxygenfree environment to recover potential renewable energy and nutrient-rich fertilizer for sustainable solid waste management. It generally takes place at solid concentrations higher than 10% and enables a higher volumetric organic loading rate, minimal material handling, lower energy requirements for heating, limited environmental consequences and energetically effective performance. The long retention time, poor startup performance, incomplete mixing and the accumulation of volatile fatty acids (VFAs) are considered as the main disadvantages for the solid-state fermentation process. In order to develop feasible dry anaerobic digestion processes, it is important to review the optimization techniques and suggest possible areas where improvements could be made. These include reactor configuration, mixing, solid retention time, feedstocks, organic loading rate, inoculation, co-digestion, pretreatment, percolation, additives and environmental conditions within the digester such as temperature, pH, buffering capacity and VFAs concentration.

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“…In addition, the degradation of amino acids can lead to the formation of hydrogen sulphide (H 2 S) which exacerbates inhibition [41,42]. One of the strategies used to alleviate ammonia inhibition as well as increase biogas generation is co-digestion of swine manure with other substrates that are low on N-based compounds [43,44]. Common substrates for co-digestion with swine manure are crop residue, food waste, and municipal organic waste.…”

Section: Swine Manure Characteristicsmentioning

confidence: 99%

Granular Sludge Bed Processes in Anaerobic Digestion of Particle-Rich Substrates

et al. 2019

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Granular sludge bed (GSB) anaerobic digestion (AD) is a well-established method for efficient wastewater treatment, limited, however, by the wastewater particle content. This review is carried out to investigate how and to what extent feed particles influence GSB to evaluate the applicability of GSB to various types of slurries that are abundantly available. Sludge bed microorganisms evidently have mechanisms to retain feed particles for digestion. Disintegration and hydrolysis of such particulates are often the rate-limiting steps in AD. GSB running on particle-rich substrates and factors that affect these processes are stdied especially. Disintegration and hydrolysis models are therefore reviewed. How particles may influence other key processes within GSB is also discussed. Based on this, limitations and strategies for effective digestion of particle-rich substrates in high-rate AD reactors are evaluated. some of the main challenges associated with high-rate anaerobic digestion of particle-rich substrates with special emphasis on manure as a substrate, due to its abundance. Most high-rate AD processes in operation depend on granular sludge to retain sufficient active biomass. Granules are formed by the aggregation of microorganisms that develop into dense masses with sedimentation velocity high enough to avoid washout even under high hydraulic load [7]. It is observed that UASB reactors treating particle-rich manure slurries also accumulates suspended solids from the feed, forming an additional suspended fraction together with the granules [8,9]. The influence of such solids on AD is not understood well, leading some experts to claim that granular sludge bed (GSB) processes may not be appropriate for particle-rich substrates. [10]. It appears, however, that a significant fraction of feed particles can be digested and enhance methane production [11]. This review was undertaken to investigate to what extent and how sludge bed high-rate AD can be used to treat particle-rich substrates. We aim to find more evidence for particle digestion in granular sludge beds, identify process limitations, and find appropriate kinetic models in order to establish design criteria for such processes. There is little directly relevant literature on the topic, limiting this review to mainly indirectly relevant literature. The review covers particle-rich substrates characteristics; particle disintegration and hydrolysis, including models for such; physical characteristics of granular sludge; sludge bed reactor designs and observations of particle effects.

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High solids anaerobic fermentation for biogas and compost production

Cited by 44 publications

References 3 publications

Anaerobic co-digestion of aquatic flora and quinoa with manures from Bolivian Altiplano

Anaerobic co-digestion of aquatic flora and quinoa with manures from Bolivian Altiplano

Research advances in dry anaerobic digestion process of solid organic wastes

Granular Sludge Bed Processes in Anaerobic Digestion of Particle-Rich Substrates

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