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Development of a Flow-through Biofilm Reactor for Anammox Startup and Operation: Nitrogen Removal and Metacommunity
https://orcid.org/0000-0001-6590-333X
https://orcid.org/0000-0002-7976-9722
A well-designed flow-through biofilm reactor (FTBR) serving as both a biofilter and a biofilm carrier was developed to effectively retain anammox bacteria within three-dimensional honeycomb-like textile structures in the anammox process. The bioreactor performance and microbiological properties were investigated under three different fluxes during a period of 160 days. Appreciable biomass aggregates were developed to enhance the nitrogen removal. Accordingly, proper turbidity (≤1 NTU) and nitrogen removal were consistently achieved, in which the FTBR achieved nitrogen removal rates (NRRs) of 0.450 and 0.706 g-N/(L·d) under the nitrogen loading rates (NLRs) of 0.503 and 0.751 g-N/(L·d), respectively. Nitrogen was removed after penetrating the biofilm, and a larger imposed flux on modules resulted in higher nitrogen removal due to the formation of different microenvironments. While the imposed flux increased, the relative abundances of the anammox group increased from 5.23% to 8.12%, whereas the ones of denitrifiers decreased and the ones of ammonium oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) did not change significantly. Of the two dominant anammox species, the abundance of Candidatus Kuenenia decreased, whereas the abundance of Candidatus Jettenia increased with increasing flux. Compared to the freely grown biofilm, bacterial communities of flow-through modules showed greater ecological niche differentiation and enhanced mass transport efficiency among species. The developed FTBR system is effective for anammox system startup and optimizing partial nitritation–anammox processes.
Enhanced start-up and operation performance of the anammox process in a novel flow-through biofilm reactor was achieved and the associated metacommunity was illustrated.
Development of a Flow-through Biofilm Reactor for Anammox Startup and Operation: Nitrogen Removal and Metacommunity
https://orcid.org/0000-0001-6590-333X
https://orcid.org/0000-0002-7976-9722
A well-designed flow-through biofilm reactor (FTBR) serving as both a biofilter and a biofilm carrier was developed to effectively retain anammox bacteria within three-dimensional honeycomb-like textile structures in the anammox process. The bioreactor performance and microbiological properties were investigated under three different fluxes during a period of 160 days. Appreciable biomass aggregates were developed to enhance the nitrogen removal. Accordingly, proper turbidity (≤1 NTU) and nitrogen removal were consistently achieved, in which the FTBR achieved nitrogen removal rates (NRRs) of 0.450 and 0.706 g-N/(L·d) under the nitrogen loading rates (NLRs) of 0.503 and 0.751 g-N/(L·d), respectively. Nitrogen was removed after penetrating the biofilm, and a larger imposed flux on modules resulted in higher nitrogen removal due to the formation of different microenvironments. While the imposed flux increased, the relative abundances of the anammox group increased from 5.23% to 8.12%, whereas the ones of denitrifiers decreased and the ones of ammonium oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) did not change significantly. Of the two dominant anammox species, the abundance of Candidatus Kuenenia decreased, whereas the abundance of Candidatus Jettenia increased with increasing flux. Compared to the freely grown biofilm, bacterial communities of flow-through modules showed greater ecological niche differentiation and enhanced mass transport efficiency among species. The developed FTBR system is effective for anammox system startup and optimizing partial nitritation–anammox processes.
Enhanced start-up and operation performance of the anammox process in a novel flow-through biofilm reactor was achieved and the associated metacommunity was illustrated.
Development of a Flow-through Biofilm Reactor for Anammox Startup and Operation: Nitrogen Removal and Metacommunity
https://orcid.org/0000-0001-6590-333X
https://orcid.org/0000-0002-7976-9722
A well-designed flow-through biofilm reactor (FTBR) serving as both a biofilter and a biofilm carrier was developed to effectively retain anammox bacteria within three-dimensional honeycomb-like textile structures in the anammox process. The bioreactor performance and microbiological properties were investigated under three different fluxes during a period of 160 days. Appreciable biomass aggregates were developed to enhance the nitrogen removal. Accordingly, proper turbidity (≤1 NTU) and nitrogen removal were consistently achieved, in which the FTBR achieved nitrogen removal rates (NRRs) of 0.450 and 0.706 g-N/(L·d) under the nitrogen loading rates (NLRs) of 0.503 and 0.751 g-N/(L·d), respectively. Nitrogen was removed after penetrating the biofilm, and a larger imposed flux on modules resulted in higher nitrogen removal due to the formation of different microenvironments. While the imposed flux increased, the relative abundances of the anammox group increased from 5.23% to 8.12%, whereas the ones of denitrifiers decreased and the ones of ammonium oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) did not change significantly. Of the two dominant anammox species, the abundance of Candidatus Kuenenia decreased, whereas the abundance of Candidatus Jettenia increased with increasing flux. Compared to the freely grown biofilm, bacterial communities of flow-through modules showed greater ecological niche differentiation and enhanced mass transport efficiency among species. The developed FTBR system is effective for anammox system startup and optimizing partial nitritation–anammox processes.
Enhanced start-up and operation performance of the anammox process in a novel flow-through biofilm reactor was achieved and the associated metacommunity was illustrated.
Development of a Flow-through Biofilm Reactor for Anammox Startup and Operation: Nitrogen Removal and Metacommunity
Jin, Chao (author) / Xing, Jiali (author) / Chen, Zijian (author) / Meng, Yabing (author) / Fan, Fuqiang (author) / Ahmed, Tawfik (author) / Meng, Fangang (author)
ACS ES&T Water ; 1 ; 573-583
2021-03-12
Article (Journal)
Electronic Resource
English
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