Microbial characteristics in anaerobic digestion process of food waste for methane production–A review

Wang, Pan; Wang, Hongtao; Qiu, Yin-Quan; Ren, Ling; Jiang, Bin

doi:10.1016/j.biortech.2017.06.152

Cited by 419 publications

(131 citation statements)

References 66 publications

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“…The use of the highest OLR (3 gCOD L −1 d −1 ) in R2 promoted the presence of Sporanaerobacter (12%) and a cluster that was associated with the Ruminococcaceae family (21%, identified with a similarity of 97%). Found genera, belonging to the Firmicutes phylum include species associated with the anaerobic environment and mesophilic temperature, and contains most known acidogenic bacteria responsible for VFA production . In fact, Sporanaerobacter was found in anaerobic digesters at the same temperature range used in the present study when food waste was used as substrate .…”

Section: Resultsmentioning

confidence: 61%

Semicontinuous anaerobic digestion of protease pretreated Chlorella biomass for volatile fatty acids production

Magdalena

Llamas

Tomás‐Pejó

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Anaerobic digestion (AD) could be designed as a source of volatile fatty acids (VFAs). However, acidogenesis optimization for novel substrates such as Chlorella vulgaris biomass needs to be investigated considering parameters such as temperature (T), organic loading rate (OLR), hydraulic retention time (HRT) and the adaptation of the sludge to temperature and substrate. RESULTS The best organic matter conversion into VFAs (CODVFA/CODin; COD, chemical oxygen demand) was achieved with HRT = 8 d, adapted anaerobic sludge (AAS) and OLR = 1.5 gCOD L−1 d−1 (CODVFA/CODin = 39.8 ± 1.0% and productivity VFA = 0.5 ± 0.1 g L−1 d−1). Acetic and butyric acids represented 50% of the total VFAs. The microbiota related to acidogenesis and acetogenesis (Firmicutes 55% of the operational taxonomic units in R5) and the low archaeal population resulted in VFA accumulation at 25 °C. CONCLUSIONS The use of low HRT and temperatures promoted VFAs production especially when AAS was employed. Microbial communities were strikingly different to the ones often found in AD targeted at biogas production. The relevance of the Firmicutes phylum (≤55% in R3 and R5) and euryarchaeota absence at 25 °C contributed to VFA accumulation. The use of AAS reported an increase in Actinobacteria species. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 61%

Semicontinuous anaerobic digestion of protease pretreated Chlorella biomass for volatile fatty acids production

Magdalena

Llamas

Tomás‐Pejó

et al. 2019

J of Chemical Tech & Biotech

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“…Anaerobic digestion comprises four key stages; hydrolysis, acidogenesis, acetogenesis and methanogenesis. The first three stages are generally regulated by bacteria, whereas the archaea drive the final step of methanogenesis . However, details about the microbial population responsible for hydrolysis and fermentation processes are lacking.…”

Section: Introductionmentioning

confidence: 99%

Microbial population dynamics in temperature‐phased anaerobic digestion of municipal wastewater sludge

Hameed

Riffat

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND The present study compared the performance and capability of thermophilic–mesophilic, temperature‐phased anaerobic digestion (TPAD) of wastewater sludge at 45 and 55 °C in terms of rate of hydrolysis and methanogenesis at two point interval times – December and January – with operational conditions kept constant (total solid content 6.5%, solids retention time 12.5 days). RESULTS The reduction of volatile solids (VS) was 77% at 45 °C TPAD‐1 and 72% at 55 °C TPAD‐II. The accumulation of ammonia and volatile fatty acids (VFAs; propionic acid) were observed to be below the inhibitory range (>3000 mg L−1), whereas the methane (CH4) production (45 °C, 3.55 ± 0.47 L CH4 L−1 day−1; 35 °C, 1.44 ± 0.12 L CH4 L−1 day−1) remained considerably higher in TPAD‐I than TPAD‐II. Furthermore, the TPAD‐II system suffered from certain degree of instability due to high level of total VFAs (6087 ± 1578 mg L−1), low buffering capacity, increased level of total NH3 (2982 ± 219 mg L−1) and free NH3 (246 ± 25 mg L−1), and relatively reduced CH4 production (1.69 ± 0.1 L L−1 day). The bacterial and archaeal population of the TPADs investigated by 454 pyrosequencing and Illumina sequencing showed, in both TPAD systems, a bacterial community dominated by Firmicutes, followed by Bacteriodetes, Proteobacteria, Synergistetes and Actiniobacteria. The archaeal community was dominated by Methanimicrobia (74–84% Methanosarcina) and Methanobacteria (15–27% Methanobacterium). A progression from genus Clostridium to Coprothermobacter and Tepidanaerobacter, and Methanocarcina to Methanothermobacter and Methanobacterium was observed in TPAD‐II. CONCLUSIONS This study proved the processes driving the dynamics of key microbial population and its correlation with hydrolytic functionality of TPAD systems. © 2019 Society of Chemical Industry

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“…They belong to the domain Archaea and are particularly sensitive to changes in the environment such as temperature and pH fluctuations. Their growth and activity could be inhibited by the presence of high levels of volatile fatty acids, hydrogen, ammonia, micro-nutrients and other compounds in their environment [6][7][8]. All these factors make the control and the management of the anaerobic digestion difficult and impose the testing and implementation of new indicators for control which are fast and focused on the activity and functioning of the methanogenic community involved in the biological process of biogas production in addition to the traditionally used technological parameters.…”

Section: Introductionmentioning

confidence: 99%

Control of biogas production process by enzymatic and fluorescent image analysis

Dinova

Belouhova

Schneider

et al. 2018

Biotechnology & Biotechnological Equipment

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The process of methanogenesis, which is in the essence of the widely distributed technologies for biogas production, is slow, has multiple steps and occurs under anaerobic conditions. These factors make the control and the management of the anaerobic digestion difficult and impose the testing and implementation of new indicators for control which are fast and focused on the activity and functioning of the methanogenic community in addition to the traditionally used technological parameters. In this study, the biogas production process in wastewater treatment plant 'Kubratovo' was analysed in two different seasonal situations and a correlation was made between the studied parameters for control. The complex methodological arsenal included the activities of aerobic and anaerobic dehydrogenase, fluorescent image analysis and key chemical and technological indicators. The correlation analysis showed that the fluorescent image analysis parameters (number/mean size of clusters; fluorescence intensity; area) had the strongest relationship with the biogas production. Based on these results, we propose a fluorescent indicative system for control of the biogas production technologies. It is a fast tool for assessment the effectiveness of the process of anaerobic digestion. Its focus on the activity and functioning of the biological system could contribute to the optimization of the whole performance of these technologies and could serve as a prediction tool for potential problems in the future.

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Microbial characteristics in anaerobic digestion process of food waste for methane production–A review

Cited by 419 publications

References 66 publications

Semicontinuous anaerobic digestion of protease pretreated Chlorella biomass for volatile fatty acids production

Semicontinuous anaerobic digestion of protease pretreated Chlorella biomass for volatile fatty acids production

Microbial population dynamics in temperature‐phased anaerobic digestion of municipal wastewater sludge

Control of biogas production process by enzymatic and fluorescent image analysis

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