Relating Anaerobic Digestion Microbial Community and Process Function : Supplementary Issue: Water Microbiology

Venkiteshwaran, Kaushik; Bocher, Benjamin T.W.; Maki, James S.; Zitomer, Daniel

doi:10.4137/mbi.s33593

Cited by 120 publications

(103 citation statements)

References 105 publications

(123 reference statements)

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“…Bacteroidetes, Chloroflexi, Firmicutes, and Proteobacteria contain most of the identified species of acidogenic bacteria that support the hydrolysis stage [41]. Microorganisms belonging to class Cytophagia predominated in the biomass (12.3–18.9%).…”

Section: Resultsmentioning

confidence: 99%

Effect of Bioaugmentation on Biogas Yields and Kinetics in Anaerobic Digestion of Sewage Sludge

Lebiocka

Montusiewicz

Cydzik‐Kwiatkowska

2018

IJERPH

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Bioaugmentation with a mixture of microorganisms (Bacteria and Archaea) was applied to improve the anaerobic digestion of sewage sludge. The study was performed in reactors operating at a temperature of 35 °C in semi-flow mode. Three runs with different doses of bioaugmenting mixture were conducted. Bioaugmentation of sewage sludge improved fermentation and allowed satisfactory biogas/methane yields and a biodegradation efficiency of more than 46%, despite the decrease in hydraulic retention time (HRT) from 20 d to 16.7 d. Moreover, in terms of biogas production, the rate constant k increased from 0.071 h−1 to 0.087 h−1 as doses of the bioaugmenting mixture were increased, as compared to values of 0.066 h−1 and 0.069 h−1 obtained with sewage sludge alone. Next-generation sequencing revealed that Cytophaga sp. predominated among Bacteria in digesters and that the hydrogenotrophic methanogen Methanoculleus sp. was the most abundant genus among Archaea.

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Section: Resultsmentioning

confidence: 99%

Effect of Bioaugmentation on Biogas Yields and Kinetics in Anaerobic Digestion of Sewage Sludge

Lebiocka

Montusiewicz

Cydzik‐Kwiatkowska

2018

IJERPH

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“…Increasing PHB surface area and porosity increases the available binding sites for biological enzymatic degradation and may therefore increase hydrolysis rates (Shang et al, 2012). Hydrolysis of recalcitrant substrates can be the rate-limiting step in methanogensis, thus pretreatments that can facilitate increased rates of hydrolysis may increase the rate of methanogenesis (Venkiteshwaran et al, 2015). Thermal alkaline pretreatment of PHB and PLA bioplastics increased anaerobic biodegradability in terms of increased BMP values and reduced lag time compared to untreated controls as described below.…”

Section: Bioplastic Pretreatment and Bmp Assaysmentioning

confidence: 99%

Pretreatment and Anaerobic Co-digestion of Selected PHB and PLA Bioplastics

Benn

Zitomer

2018

Front. Environ. Sci.

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102

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Conventional petroleum-derived plastics are recalcitrant to biodegradation and can be problematic as they accumulate in the environment. In contrast, it may be possible to add novel, biodegradable bioplastics to anaerobic digesters at municipal water resource recovery facilities along with primary sludge to produce more biomethane. In this study, thermal and chemical bioplastic pretreatments were first investigated to increase the rate and extent of anaerobic digestion. Subsequently, replicate, bench-scale anaerobic co-digesters fed synthetic primary sludge with and without PHB bioplastic were maintained for over 170 days. Two polyhydroxybutyrate (PHB), one poly(3-hydroxybutyrate-co-4-hydroxybutyrate) and one polylactic acid (PLA) bioplastic were investigated. Biochemical methane potential (BMP) assays were performed using both untreated bioplastic as well as bioplastic pretreated at elevated temperature (35-90 • C) under alkaline conditions (8

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“…The AD process relies on the degradation of organic matter by a network of microorganisms presenting diverse nutritional requirements and physiological characteristics (Shah, 2014). These microorganisms also present different responses to environmental stresses, such as temperature, pH variations, substrate composition/concentration or the presence of inhibitory or toxic compounds (Shah, 2014;Venkiteshwaran et al, 2015). Several studies have focused on the development of microbial communities in laboratory-scale AD bioreactors operated at >35 • C to lower temperature conditions, with special focus on the methanogenic portion of communities (Enright et al, 2009;McKeown et al, 2009;O'Reilly et al, 2009;Abram et al, 2011;Bandara et al, 2012;Zhang et al, 2012;Gunnigle et al, 2015a,b;Keating et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Microbial Community Redundancy and Resilience Underpins High-Rate Anaerobic Treatment of Dairy-Processing Wastewater at Ambient Temperatures

Paulo

Castilla-Archilla

Ramiro-García

et al. 2020

Front. Bioeng. Biotechnol.

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High-rate anaerobic digestion (AD) is a reliable, efficient process to treat wastewaters and is often operated at temperatures exceeding 30 • C, involving energy consumption of biogas in temperate regions, where wastewaters are often discharged at variable temperatures generally below 20 • C. High-rate ambient temperature AD, without temperature control, is an economically attractive alternative that has been proven to be feasible at laboratory-scale. In this study, an ambient temperature pilot scale anaerobic reactor (2 m 3 ) was employed to treat real dairy wastewater in situ at a milk processing plant, at organic loading rates of 1.3 ± 0.6 to 10.6 ± 3.7 kg COD/m 3 /day and hydraulic retention times (HRT) ranging from 36 to 6 h. Consistent high levels of COD removal efficiencies, ranging from 50 to 70% for total COD removal and 70 to 84% for soluble COD removal, were achieved during the trial. Within the reactor biomass, stable active archaeal populations were observed, consisting mainly of Methanothrix (previously Methanosaeta) species, which represented up to 47% of the relative abundant active species in the reactor. The decrease in HRT, combined with increases in the loading rate had a clear effect on shaping the structure and composition of the bacterial fraction of the microbial community, however, without affecting reactor performance. On the other hand, perturbances in influent pH had a strong impact, especially when pH went higher than 8.5, inducing shifts in the microbial community composition and, in some cases, affecting negatively the performance of the reactor in terms of COD removal and biogas methane content. For example, the main pH shock led to a drop in the methane content to 15%, COD removals decreased to 0%, while the archaeal population decreased to ∼11% both at DNA and cDNA levels. Functional redundancy in the microbial community underpinned stable reactor performance and rapid reactor recovery after perturbations.

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Relating Anaerobic Digestion Microbial Community and Process Function : Supplementary Issue: Water Microbiology

Cited by 120 publications

References 105 publications

Effect of Bioaugmentation on Biogas Yields and Kinetics in Anaerobic Digestion of Sewage Sludge

Effect of Bioaugmentation on Biogas Yields and Kinetics in Anaerobic Digestion of Sewage Sludge

Pretreatment and Anaerobic Co-digestion of Selected PHB and PLA Bioplastics

Microbial Community Redundancy and Resilience Underpins High-Rate Anaerobic Treatment of Dairy-Processing Wastewater at Ambient Temperatures

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