Inhibition of anaerobic digestion processes: Applications of molecular tools

Amha, Yamrot M.; Anwar, Muhammad Zohaib; Brower, Andrew V. Z.; Jacobsen, Carsten Suhr; Stadler, Lauren B.; Webster, Tara M.; Smith, Adam L.

doi:10.1016/j.biortech.2017.08.210

Cited by 110 publications

(53 citation statements)

References 146 publications

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“…Anaerobic digestion (AD) is a microbial process based on the combined and syntrophic activities of a wide range of microorganisms from hydrolytic and fermentative bacteria to methanogenic archaea (Stams and Plugge, 2009). The microbial community of AD reactors is mainly affected by substrate composition (Regueiro et al, 2012;Zhang et al, 2014) and operational conditions (Vanwonterghem et al, 2015;Regueiro et al, 2016;Amha et al, 2018). One of the most important factors that drastically affects AD microbial communities is temperature as it imposes a selection pressure on the communities shifting the abundance and activity of specific populations in digesters treating different kinds of waste like beet molasses, maize, slaughterhouse or fish residues, municipal solid wastes and swine or pig manures (Regueiro et al, 2014;Vrieze et al, 2015;Lin et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Air‐side ammonia stripping coupled to anaerobic digestion indirectly impacts anaerobic microbiome

Fernandez‐Gonzalez

Pedizzi

Lema

et al. 2019

Microbial Biotechnology

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Summary Air‐side stripping without a prior solid–liquid phase separation step is a feasible and promising process to control ammonia concentration in thermophilic digesters. During the process, part of the anaerobic biomass is exposed to high temperature, high pH and aerobic conditions. However, there are no studies assessing the effects of those harsh conditions on the microbial communities of thermophilic digesters. To fill this knowledge gap, the microbiomes of two thermophilic digesters (55°C), fed with a mixture of pig manure and nitrogen‐rich co‐substrates, were investigated under different organic loading rates (OLR: 1.1–5.2 g COD l−1 day−1), ammonia concentrations (0.2–1.5 g free ammonia nitrogen l−1) and stripping frequencies (3–5 times per week). The bacterial communities were dominated by Firmicutes and Bacteroidetes phyla, while the predominant methanogens were Methanosarcina sp archaea. Increasing co‐substrate fraction, OLR and free ammonia nitrogen (FAN) favoured the presence of genera Ruminiclostridium, Clostridium and Tepidimicrobium and of hydrogenotrophic methanogens, mainly Methanoculleus archaea. The data indicated that the use of air‐side stripping did not adversely affect thermophilic microbial communities, but indirectly modulated them by controlling FAN concentrations in the digester. These results demonstrate the viability at microbial community level of air side‐stream stripping process as an adequate technology for the ammonia control during anaerobic co‐digestion of nitrogen‐rich substrates.

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Section: Introductionmentioning

confidence: 99%

Air‐side ammonia stripping coupled to anaerobic digestion indirectly impacts anaerobic microbiome

Fernandez‐Gonzalez

Pedizzi

Lema

et al. 2019

Microbial Biotechnology

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“…Instabilities and disturbances of the anaerobic digestion process may have manifold causes with different underlying mechanisms [26][27][28][29]. The main types occurring in agricultural biogas production can be classified as follows:…”

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confidence: 99%

Process Disturbances in Agricultural Biogas Production—Causes, Mechanisms and Effects on the Biogas Microbiome: A Review

2019

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Disturbances of the anaerobic digestion process reduce the economic and environmental performance of biogas systems. A better understanding of the highly complex process is of crucial importance in order to avoid disturbances. This review defines process disturbances as significant changes in the functionality within the microbial community leading to unacceptable and severe decreases in biogas production and requiring an active counteraction to be overcome. The main types of process disturbances in agricultural biogas production are classified as unfavorable process temperatures, fluctuations in the availability of macro- and micronutrients (feedstock variability), overload of the microbial degradation potential, process-related accumulation of inhibiting metabolites such as hydrogen (H2), ammonium/ammonia (NH4+/NH3) or hydrogen sulphide (H2S) and inhibition by other organic and inorganic toxicants. Causes, mechanisms and effects on the biogas microbiome are discussed. The need for a knowledge-based microbiome management to ensure a stable and efficient production of biogas with low susceptibility to disturbances is derived and an outlook on potential future process monitoring and control by means of microbial indicators is provided.

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“…Different kinds of VFAs such as acetic, propionic, butyric, valeric, formic, and caproic acids are the intermediate products of the second and third stages; acidogenesis and acetogenesis of AD [41,42]. These VFAs are important while assessing the performance and monitoring of the stability of AD processes [42,43].…”

Section: Acidogenesis and Acetogenesismentioning

confidence: 99%

A review on strategies to optimize metabolic stages of anaerobic digestion of municipal solid wastes towards enhanced resources recovery

Richard

Hilonga

Machunda

et al. 2019

Sustain Environ Res

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Recently, there are increased efforts by municipals and researchers to investigate the potential of utilizing municipal solid wastes (MSW) for resources recovery. In many parts of developing countries, MSW is mostly collected for disposal with little emphasis on resources recovery. However, the MSW has high organic and moisture contents, and are suitable substrates for anaerobic digestion (AD) process to recover biogas for energy and digestate which can be used as fertilizers or for soil amendments. Resources recovery from the AD process consists of four metabolic stages; hydrolysis, acidogenesis, acetogenesis, and methanogenesis. These metabolic stages can be affected by several factors such as the nature of substrates, accumulation of volatile fatty acids, and ammonia inhibition. In this review, different optimization strategies towards resources recoveries such as pre-treatment, codigestion, trace elements supplementation, optimization of key parameters and the use of granular activated carbon are discussed. The review reveals that the currently employed optimization strategies fall short in several ways and proposes the need for improvements.

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Inhibition of anaerobic digestion processes: Applications of molecular tools

Cited by 110 publications

References 146 publications

Air‐side ammonia stripping coupled to anaerobic digestion indirectly impacts anaerobic microbiome

Air‐side ammonia stripping coupled to anaerobic digestion indirectly impacts anaerobic microbiome

Process Disturbances in Agricultural Biogas Production—Causes, Mechanisms and Effects on the Biogas Microbiome: A Review

A review on strategies to optimize metabolic stages of anaerobic digestion of municipal solid wastes towards enhanced resources recovery

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