Journal ArticleDOI
Effects of bioaugmentation strategies in UASB reactors with a methanogenic consortium for removal of phenolic compounds
TLDR
Tests performed with the reactors biomass under non-limiting substrate concentrations showed that the specific activities of the bioaugmented biomasses were larger than the original biomass for phenol, and p-cresol even after 276 of operations, showing that the inoculum bacteria successfully colonized the sludge granules.Abstract:
The removal of phenol, ortho- (o-) and para- (p-)cresol was studied with two series of UASB reactors using unacclimatized granular sludges bioaugmented with a consortium enriched against these substances. The parameters studied were the amount of inoculum added to the sludges and the method of immobilization of the inoculum. Two methods were used, adsorption to the biomass or encapsulation within calcium alginate beads. In the bioaugmentation by adsorption experiment, and with a 10% inoculum, complete phenol removal was obtained after 36 d, while 178 d were required in the control reactor. For p-cresol, 95% removal was obtained in the bioaugmented reactor on day 48 while 60 d were required to achieve 90% removal in the control reactor. For o-cresol, the removals were only marginally better with the bioaugmented reactors. Tests performed with the reactors biomass under non-limiting substrate concentrations showed that the specific activities of the bioaugmented biomasses were larger than the original biomass for phenol, and p-cresol even after 276 of operations, showing that the inoculum bacteria successfully colonized the sludge granules. Immobilization of the inoculum by encapsulation in calcium alginate beads, was performed with 10% of the inoculum. Results showed that the best activities were obtained when the consortium was encapsulated alone and the beads added to the sludges. This reactor presented excellent activity and the highest removal of the various phenolic compounds a few days after start-up. After 90 d, a high-phenolic compounds removal was still observed, demonstrating the effectiveness of the encapsulation technique for the start-up and maintenance of high-removal activities.read more
Citations
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New Approaches for Bioaugmentation as a Remediation Technology
TL;DR: Several new approaches that may increase the persistence and activity of exogenous microorganisms and/or genes following introduction into the environment are detailed.
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Bioaugmentation of syntrophic acetate-oxidizing culture in biogas reactors exposed to increasing levels of ammonia.
TL;DR: The findings further demonstrate the strong influence of ammonia on the methane-producing consortia and on the representative methanization pathway in mesophilic biogas reactors.
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Relating Anaerobic Digestion Microbial Community and Process Function
TL;DR: More work is required to realize robust, quantitative relationships between microbial community structure and functions such as methane production rate and resilience after perturbations and to describe microbial communities in digester function.
Journal ArticleDOI
Bioaugmentation of an anaerobic sequencing batch biofilm reactor (AnSBBR) with immobilized sulphate reducing bacteria (SRB) for the treatment of sulphate bearing chemical wastewater.
TL;DR: The introduction of enriched SRB consortia resulted in altering the competition between anaerobic bacteria in the system leading to the overall improvement in the process performance.
Journal ArticleDOI
Bioaugmentation for improved recovery of anaerobic digesters after toxicant exposure.
TL;DR: In conclusion, bioaugmentation with an H(2)-utilizing culture is a potential tool to decrease the recovery period, decrease propionate concentration, and increase biogas production of some anaerobic digesters after a toxic event.
References
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Journal ArticleDOI
Kinetics of phenol biodegradation by an immobilized methanogenic consortium.
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Journal ArticleDOI
Bioaugmentation for enhancing biological wastewater treatment.
Dianne Stephenson,Tom Stephenson +1 more
TL;DR: In laboratory investigations bioaugmentation often failed, whereas at full scale it was often successful, probably due to the imposition of steady state at laboratory scale.