Anaerobic Digestion Processes

Safferman, Steven I.; Kirk, Dana; Faivor, Louis L; Haan, Wei Wu

doi:10.1002/9781118371220.ch3

Cited by 2 publications

(1 citation statement)

References 46 publications

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“…Co-digestion of multiple feedstocks was hence introduced to enhance AD performance of biogas production and total solids (TS) reduction [3e5]. In addition, the overall performance of an AD system depends on not only the composition of feedstock, but also operational parameters such as temperature [6]. Conventional operational temperatures range from mesophilic (30e38 C) to thermophilic (49e57 C), and it has been proven that operational temperature is one of the most important determinants of the microbial community structure in an AD system [6,7].…”

Section: Introductionmentioning

confidence: 99%

Responses of anaerobic microorganisms to different culture conditions and corresponding effects on biogas production and solid digestate quality

Chen

Murillo-Roos²,

Zhong

et al. 2016

Biomass and Bioenergy

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Microbial communities of anaerobic digestion have been intensively investigated in the past decades. Majority of these studies focused on correlating microbial diversity with biogas production. The relationship between microbial communities and compositional changes of the solid digestate (AD fiber) has not been comprehensively studied to date. Therefore, the objective of this study was to understand the responses of microbial communities to different operational conditions of anaerobic co-digestion and their influences on biogas production and solid digestate quality. Two temperatures and three manureto-food waste ratios were investigated by a completely randomized design. Molecular analyses demonstrate that both temperature and manure-to-food waste ratio greatly influenced the bacterial communities, while archaeal communities were mainly influenced by temperature. The digestion performance showed that biogas productivity increased with the increase of supplemental food wastes, and there were no significant differences on carbohydrate contents among different digestions. The statistical analyses conclude that microbes changed their community configuration under different conditions to enhance digestion performance for biogas and homogenized solid digestate production.

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Section: Introductionmentioning

confidence: 99%

Responses of anaerobic microorganisms to different culture conditions and corresponding effects on biogas production and solid digestate quality

Chen

Murillo-Roos²,

Zhong

et al. 2016

Biomass and Bioenergy

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Biogas from Fresh Spring and Summer Grass: Effect of the Harvesting Period

et al. 2018

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Yard trimmings, landscape management and agricultural practices determine the collection of biomass currently destined mainly to the production of a valuable soil amendant by composting. While composting requires energy, especially for the turning/aeration phases and for air treatment (i.e., biofilters in the case of enclosed systems), anaerobic digestion represents an energy positive process that results in production of biogas and digestate, which can be used as fuel and fertilizer, respectively. The focus of the present research was the evaluation of biogas and methane potential of grass collected in two different periods of the year (spring and summer) from riverbanks located in Northern Italy. The conversion to biogas of feedstocks is greatly influenced by the composition of the organic matter, content of cellulose, and lignin in particular. The production of biomass per hectare and the consequent biogas production were also evaluated. The experimental tests were performed on both samples of fresh grass in laboratory scale batch reactors, characterized by 4.0 L of volume and operated in mesophilic conditions (38 • C), for 40 days per cycle. The anaerobic digestion process was performed on a mixture of inoculum and grass, characterized by inoculum:substrate VS (volatile solids) ratio equal to 2. The inoculum was represented by digestate from a full-scale anaerobic digestion plant fed with dairy cow manure. The results in terms of biogas production, biogas quality (CH 4 , CO 2 , H 2 S), and emissions from digestates (NH 3 , CO 2 and CH 4) are presented in the paper. Total solids (TS), volatile solids (VS), pH, volatile fatty acids (VFA), alkalinity, acidity vs. alkalinity ratio, fibers (cellulose, lignin), and total Kjieldahl nitrogen (TKN) were determined both on input and output of the process. The biogas yield obtained from grass resulted higher than expected, quite similar to the yield obtained from energy crops, with Biomethane Potential (BMP) of 340.2 NL•kg −1 VS and of 307.7 NL•kg −1 VS, respectively, for spring and summer grass. Biogas quality was slightly lower for summer grass, perhaps in relation to the higher content of fibers (lignin). Alternatively, the yield of grass per surface was significantly different between spring and summer with the highest production in the summer. In fact, the results revealed a methane yield of 263 Nm 3 •ha −1 and of 1181 Nm 3 •ha −1 , respectively for spring and summer grass.

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Anaerobic Digestion Processes

Cited by 2 publications

References 46 publications

Responses of anaerobic microorganisms to different culture conditions and corresponding effects on biogas production and solid digestate quality

Responses of anaerobic microorganisms to different culture conditions and corresponding effects on biogas production and solid digestate quality

Biogas from Fresh Spring and Summer Grass: Effect of the Harvesting Period

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