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Microbial community redundancy in anaerobic digestion drives process recovery after salinity exposure

(2017) WATER RESEARCH. 111. p.109-117
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Abstract
Anaerobic digestion of high-salinity wastewaters often results in process inhibition due to the susceptibility of the methanogenic archaea. The ability of the microbial community to deal with increased salinity levels is of high importance to ensure process perseverance or recovery after failure. The exact strategy of the microbial community to ensure process endurance is, however, often unknown. In this study, we investigated how the microbial community is able to recover process performance following a disturbance through the application of high-salinity molasses wastewater. After a stable start-up, methane production quickly decreased from 625 +/- 17 to 232 35 mL CH4 L-1 d(-1) with a simultaneous accumulation in volatile fatty acids up to 20.5 +/- 1.4 g COD L-1, indicating severe process disturbance. A shift in feedstock from molasses wastewater to waste activated sludge resulted in complete process recovery. However, the bacterial and archaeal communities did not return to their original composition as before the disturbance, despite similar process conditions. Microbial community diversity was recovered to similar levels as before disturbance, which indicates that the metabolic potential of the community was maintained. A mild increase in ammonia concentration after process recovery did not influence methane production, indicating a well-balanced microbial community. Hence, given the change in community composition following recovery after salinity disturbance, it can be assumed that microbial community redundancy was the major strategy to ensure the continuation of methane production, without loss of functionality or metabolic flexibility.
Keywords
16S rRNA gene, Biogas, Illumina sequencing, Methanogenesis, Microbiome, Salt, SYNTROPHIC ACETATE OXIDATION, SUGAR-BEET SILAGE, METHANE PRODUCTION, CO-DIGESTION, BIOGAS REACTORS, CHICKEN MANURE, AMMONIA INHIBITION, PROCESS STABILITY, WASTE-WATER, FOOD WASTE

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Chicago
De Vrieze, Jo, Marlies Christiaens, Diego Walraedt, Arno Devooght, Umer Zeeshan Ijaz, and Nico Boon. 2017. “Microbial Community Redundancy in Anaerobic Digestion Drives Process Recovery After Salinity Exposure.” Water Research 111: 109–117.
APA
De Vrieze, Jo, Christiaens, M., Walraedt, D., Devooght, A., Ijaz, U. Z., & Boon, N. (2017). Microbial community redundancy in anaerobic digestion drives process recovery after salinity exposure. WATER RESEARCH, 111, 109–117.
Vancouver
1.
De Vrieze J, Christiaens M, Walraedt D, Devooght A, Ijaz UZ, Boon N. Microbial community redundancy in anaerobic digestion drives process recovery after salinity exposure. WATER RESEARCH. 2017;111:109–17.
MLA
De Vrieze, Jo, Marlies Christiaens, Diego Walraedt, et al. “Microbial Community Redundancy in Anaerobic Digestion Drives Process Recovery After Salinity Exposure.” WATER RESEARCH 111 (2017): 109–117. Print.
@article{8521090,
  abstract     = {Anaerobic digestion of high-salinity wastewaters often results in process inhibition due to the susceptibility of the methanogenic archaea. The ability of the microbial community to deal with increased salinity levels is of high importance to ensure process perseverance or recovery after failure. The exact strategy of the microbial community to ensure process endurance is, however, often unknown. In this study, we investigated how the microbial community is able to recover process performance following a disturbance through the application of high-salinity molasses wastewater. After a stable start-up, methane production quickly decreased from 625 +/- 17 to 232 35 mL CH4 L-1 d(-1) with a simultaneous accumulation in volatile fatty acids up to 20.5 +/- 1.4 g COD L-1, indicating severe process disturbance. A shift in feedstock from molasses wastewater to waste activated sludge resulted in complete process recovery. However, the bacterial and archaeal communities did not return to their original composition as before the disturbance, despite similar process conditions. Microbial community diversity was recovered to similar levels as before disturbance, which indicates that the metabolic potential of the community was maintained. A mild increase in ammonia concentration after process recovery did not influence methane production, indicating a well-balanced microbial community. Hence, given the change in community composition following recovery after salinity disturbance, it can be assumed that microbial community redundancy was the major strategy to ensure the continuation of methane production, without loss of functionality or metabolic flexibility.},
  author       = {De Vrieze, Jo and Christiaens, Marlies and Walraedt, Diego and Devooght, Arno and Ijaz, Umer Zeeshan and Boon, Nico},
  issn         = {0043-1354},
  journal      = {WATER RESEARCH},
  keyword      = {16S rRNA gene,Biogas,Illumina sequencing,Methanogenesis,Microbiome,Salt,SYNTROPHIC ACETATE OXIDATION,SUGAR-BEET SILAGE,METHANE PRODUCTION,CO-DIGESTION,BIOGAS REACTORS,CHICKEN MANURE,AMMONIA INHIBITION,PROCESS STABILITY,WASTE-WATER,FOOD WASTE},
  language     = {eng},
  pages        = {109--117},
  title        = {Microbial community redundancy in anaerobic digestion drives process recovery after salinity exposure},
  url          = {http://dx.doi.org/10.1016/j.watres.2016.12.042},
  volume       = {111},
  year         = {2017},
}

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