Anaerobic digestion from the viewpoint of microbiological, chemical, and operational aspects — a review

Amani, T.; Nosrati, Masoud; Sreekrishnan, T.R.

doi:10.1139/a10-011

Cited by 300 publications

(171 citation statements)

References 170 publications

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“…The EL interaction energy was calculated as follows [16]: (6) where is the zeta potential of M. barkeri and the support material surfaces and assumed to be the same as the surface potential, is the electrical permittivity of the medium (8.854 x 10 -12 C 2 J -1 m -1 ) [22,27], His the separation distance and is the double layer thickness, calculated as [16]:…”

Section: Xdlvo Energy Profilesmentioning

confidence: 99%

Physicochemical analysis of initial adhesion and biofilm formation of Methanosarcina barkeri on polymer support material

Nguyen

Karunakaran

Collins

et al. 2016

Colloids and Surfaces B: Biointerfaces

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Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs (CC BY-NC-ND) licence. This licence only allows you to download this work and share it with others as long as you credit the authors, but you can't change the article in any way or use it commercially. More information and the full terms of the licence here: https://creativecommons.org/licenses/ Takedown If you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. *Graphical Abstract HighlightsOf the six materials tested Methanosarcina barkeri selectively adheres to polytetrafluoroethylene (PTFE), polypropylene (PP) and polyvinyl chloride (PVC) The best support materials for initial adhesion after 2 h also performed best after 72 h. xDLVO model predictions correlated with experimental adhesion results. Applicability of the xDLVO model in identifying support materials for selective attachment of M. barkeri. ! *Highlights (for review) Physicochemical analysis of initial adhesion and biofilm formation of HighlightsOf the six materials tested Methanosarcina barkeri selectively adheres to polytetrafluoroethylene (PTFE), polypropylene (PP) and polyvinyl chloride (PVC) The best support materials for initial adhesion after 2 h also performed best after 72 h. xDLVO model predictions correlated with experimental adhesion results. Applicability of the xDLVO model in identifying support materials for selective attachment of M. barkeri. AbstractThe retention of selective biofilms of Methanosarcina species within anaerobic digesters could reduce start-up times and enhance the efficiency of the process in treating high-strength domestic sewage. The objective of the study was to examine the effect of the surface characteristics of six common polymer support materials on the initial adhesion of the model methanogen, Methanosarcina barkeri, and to assess the potential of these support materials as selective biofilm carriers. Results from both the initial adhesion tests and extended DLVO (xDLVO) model correlated with each other, with PVC (12% surface coverage/mm 2 ), PTFE (6% surface coverage/mm 2 ), and PP (6% surface coverage/mm 2 ), shown to be the better performing support materials for initial adhesion, as well as subsequent biofilm formation by M. barkeri after 72 h. These three support materials Experimental results showed that the type of material strongly influenced the extent of adhesion from M. barkeri (p < 0.0001), and the xDLVO model was able to explain the results in these environmental conditions. Therefore, DLVO physicochemical forces were found to be influential on the initial adhesion of M. barkeri. Scanning electron microscopy suggested that production of extracellular polymeric substances ...

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Section: Xdlvo Energy Profilesmentioning

confidence: 99%

Physicochemical analysis of initial adhesion and biofilm formation of Methanosarcina barkeri on polymer support material

Nguyen

Karunakaran

Collins

et al. 2016

Colloids and Surfaces B: Biointerfaces

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“…The most popular method of sludge stabilization is methane fermentation, which is a multi-track process that transforms organic compounds into biogas and digested sludge. Methane fermentation has become an alternative energy source because methane from biogas can be used to produce heat during combustion and energy cogeneration (Pokój et al 2014, Amani et al 2010.…”

Section: Introductionmentioning

confidence: 99%

Microbiota of anaerobic digesters in a full-scale wastewater treatment plant

Świątczak

Cydzik‐Kwiatkowska

Rusanowska

2017

Archives of Environmental Protection

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Abstract:Anaerobic digestion is an important technology for the bio-based economy. The stability of the process is crucial for its successful implementation and depends on the structure and functional stability of the microbial community. In this study, the total microbial community was analyzed during mesophilic fermentation of sewage sludge in full-scale digesters.The digesters operated at 34-35°C, and a mixture of primary and excess sludge at a ratio of 2:1 was added to the digesters at 550 m 3 /d, for a sludge load of 0.054 m 3 /(m 3 ·d). The amount and composition of biogas were determined. The microbial structure of the biomass from the digesters was investigated with use of next-generation sequencing.The percentage of methanogens in the biomass reached 21%, resulting in high quality biogas (over 61% methane content). The abundance of syntrophic bacteria was 4.47%, and stable methane production occurred at a Methanomicrobia to Synergistia ratio of 4.6:1.0. The two most numerous genera of methanogens (about 11% total) were Methanosaeta and Methanolinea, indicating that, at the low substrate loading in the digester, the acetoclastic and hydrogenotrophic paths of methane production were equally important. The high abundance of the order Bacteroidetes, including the class Cytophagia (11.6% of all sequences), indicated the high potential of the biomass for effi cient degradation of lignocellulitic substances, and for degradation of protein and amino acids to acetate and ammonia.This study sheds light on the ecology of microbial groups that are involved in mesophilic fermentation in mature, stably-performing microbiota in full-scale reactors fed with sewage sludge under low substrate loading.

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“…Based on these observations as well as the increased gas production that followed, it is reasonable to assume that the straw degradation in the pilot-scale digester was occurring by Day 14 of the digestion cycle. Following VFA accumulation, concentrations settled around 400 mgHAc/L which is within the optimum range of 50 to 500 mgHAc/L for anaerobic digestion [27], signifying stable digester performance.…”

Section: Discussionmentioning

confidence: 80%

“…The primary reason for this difference is the lack of mixing capacity in the pilot-scale reactor. Lack of mixing typically results in less methane production and incomplete digestion since there is no uniform distribution of substrate, inocula and enzymes [27]. Internal mixing components for dry digestion systems require lots of energy and maintenance since the material is heavy and immobile.…”

Section: Discussionmentioning

confidence: 99%

“…The digester leachate was slightly acidic (6.25) during peak VFA production but quickly recovered within a couple days. The alkalinity sup- plied by the piggery wastewater was sufficient (approximately 3,000 mgCaCO 3 /L) to prevent an extreme drop in pH, and the TAN concentrations were adequate but not inhibitory for the anaerobic digestion process [27,30].…”

Section: Discussionmentioning

confidence: 99%

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Enhanced Methane Production from Pilot-Scale Anaerobic Digester Loaded with Rice Straw

Mussoline¹,

Esposito²,

Lens³

et al. 2013

TOENVIEJ

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A novel co-digestion approach was evaluated to determine if agricultural and industrial waste residues could efficiently degrade straw without pretreatment. Untreated rice straw was co-digested with pig wastewater and anaerobic sludge from the pulp and paper mill treatment process in a pilot-scale digester (1 m 3 ) operated in dry, mesophilic conditions. The total weight ratio of dry straw to pig wastewater to sludge was 1 to1.25 to 0.5. The experiment was performed for a total of 153 days, however, the optimum period to balance the maximum energy output with the minimum retention time was determined to be 93 days. The addition of paper mill sludge accelerated VFA formation and gas production when compared to another pilot-scale digester operated under the same conditions without the sludge material. The straw in the pilot-scale digester with the sludge yielded 231 LCH 4 /kg VS within a 93-day digestion cycle compared to 189 days without the sludge. Daily leachate recirculation (0.2m 3 /m 3 straw-day), however, was not adequate for internal mixing and homogenization of the digester material. With adequate mixing, this co-digestion approach could enhance methane production and reduce the digestion time for untreated rice straw in a farm-scale digester.

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Anaerobic digestion from the viewpoint of microbiological, chemical, and operational aspects — a review

Cited by 300 publications

References 170 publications

Physicochemical analysis of initial adhesion and biofilm formation of Methanosarcina barkeri on polymer support material

Physicochemical analysis of initial adhesion and biofilm formation of Methanosarcina barkeri on polymer support material

Microbiota of anaerobic digesters in a full-scale wastewater treatment plant

Enhanced Methane Production from Pilot-Scale Anaerobic Digester Loaded with Rice Straw

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