Natural continuous influent nitrifier immigration effects on nitrification and the microbial community of activated sludge systems

Li, Yu; Li, Ren; Delatolla, Robert; Zhang, Ru; Yang, Xinglun; Peng, Dangcong

doi:10.1016/j.jes.2018.02.021

Cited by 20 publications

(7 citation statements)

References 37 publications

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“…This result further supported that the SABRsfunctionwas robust tovarious disturbances,which could be related to adaptation to uctuating environmental conditions (Berga et al 2017). In addition, the in uent nitri ermay be related to the resilience of SABRs, as the response of bacterial communities to disturbances can be affected by the dispersal (Yu et al 2018), and the long HRT may also play an important roleas it can dilute the NH 4 + -N concentration in surface water.…”

Section: Resultsmentioning

confidence: 99%

Treatment of Polluted Urban Surface Waters by Sponge Based Aerobic Biofilm Reactor: Purification Performances and Resilience

Song

Yao

et al. 2021

Preprint

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Surface waters are suffering continuous discharging of pollutions, and low DO and black-odorous were easily formed, especially in those slow-flowing urban lakes and enclosed small ponds. In-situ treatment by artificial aeration or water cycling with a combination of polyurethane sponge as biofilm carriers can disentangle this situation without any land occupation. Long-term continuous experiments (187 days) showed that indigenous microorganisms in urban surface waters could form biofilms in the novel style of sponge-based aerobic biofilm reactors (SABRs). In urban lake waters treatment, the purification performances of SABRs were stable and resilient as the NH4+-N and NO2−-N removals were steady, even facing the abrupt increase of NH4+-N and NO2−-N concentrations in influent. Enhancing the polyurethane sponge filling ratios in SABRs can reduce DO but did not affect NH4+-N removal. SABRs were also able to treat enclosed surface waters or black-odorous waterbodies. Combined SABRs with water cycling, NH4+-N removal time was shorter than the time needed by water cycling when biodegradable organic matter was not present. The massive biodegradable organic matter could inhibit nitrification and prolong the purification time. Further results showed that organic matter could be used as carbon sources to eliminate the produced NO3−-N in SABRs. Therefore, the developed new bioreactor could act as one effective way for treating N-polluted urban surface waters.

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Section: Resultsmentioning

confidence: 99%

Treatment of Polluted Urban Surface Waters by Sponge Based Aerobic Biofilm Reactor: Purification Performances and Resilience

Song

Yao

et al. 2021

Preprint

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“…Here, we showed that recruitment of organisms from the existing seed-bank is also possible after disturbance. As immigration of nitrifiers into sludge systems has been shown to alter the local community composition and function 64 , 65 , studies of the effect of disturbance in closed sludge systems can help disentangle the effect of immigrating populations.…”

Section: Discussionmentioning

confidence: 99%

Sustained organic loading disturbance favors nitrite accumulation in bioreactors with variable resistance, recovery and resilience of nitrification and nitrifiers

Santillan

Phua

Constancias

et al. 2020

Sci Rep

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Sustained disturbances are relevant for environmental biotechnology as they can lead to alternative stable states in a system that may not be reversible. Here, we tested the effect of a sustained organic loading alteration (food-to-biomass ratio, F:M, and carbon-to-nitrogen ratio, C:N) on activated sludge bioreactors, focusing on the stability of nitrification and nitrifiers. Two sets of replicate 5-L sequencing batch reactors were operated at different, low and high, F:M (0.19–0.36 mg COD/mg TSS/d) and C:N (3.5–6.3 mg COD/mg TKN) conditions for a period of 74 days, following 53 days of sludge acclimation. Recovery and resilience were tested during the last 14 days by operating all reactors at low F:M and C:N (henceforth termed F:M–C:N). Stable nitrite accumulation (77%) was achieved through high F:M–C:N loading with a concurrent reduction in the abundance of Nitrospira. Subsequently, only two of the three reactors experiencing a switch back from high to low F:M–C:N recovered the nitrite oxidation function, with an increase in Nitrobacter as the predominant NOB, without a recovery of Nitrospira. The AOB community was more diverse, resistant and resilient than the NOB community. We showed that functional recovery and resilience can vary across replicate reactors, and that nitrification recovery need not coincide with a return to the initial nitrifying community structure.

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“…It was proposed that disturbance opens niches for bacterial colonization in open sludge systems [84], but we showed that recruitment of organisms from the seed-bank is also possible. Moreover, as immigration of nitrifiers into sludge systems has been shown to alter the local community composition and function [85,86], studies of nitrification resilience in open sludge systems [21] cannot disentangle the effect of immigrating populations from their observations.…”

Section: Resilience Of Ecosystem Function and Nitrifiersmentioning

confidence: 99%

Sustained organic loading disturbance favors nitrite accumulation in bioreactors with variable resistance, recovery and resilience of nitrification and nitrifiers

Santillan

Phua

Constancias

et al. 2019

Preprint

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15Sustained perturbations are relevant for environmental biotechnology as they can lead systems to 16 alternative stable states that may not be reversible. Studies assessing these concerns are scarce as 17 robust replication is required. Here, we tested the effect of sustained organic loading variations (food-18 to-biomass ratio, F:M; carbon-to-nitrogen ratio, C:N) on both structure and function of activated 19 sludge bacterial communities, focusing on nitrification and nitrifiers. Two sets of replicate 5-liter 20 sequencing batch reactors were operated at two different, low (n=4) and high (n=3), F:M (0.19-0.36 21 mgCOD/mgTSS/d) and C:N (3.5-6.3 mgCOD/mgTKN) conditions for a period of 74 days, following 22 53 days of sludge acclimation. The inoculum was taken from a full-scale treatment plant. Resilience 23 was tested during the last 14 days by operating all seven reactors at low F:M-C:N. Samples were 24 analyzed using metagenomics, 16S rRNA gene amplicon sequencing, and effluent characterization. 25

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Natural continuous influent nitrifier immigration effects on nitrification and the microbial community of activated sludge systems

Cited by 20 publications

References 37 publications

Treatment of Polluted Urban Surface Waters by Sponge Based Aerobic Biofilm Reactor: Purification Performances and Resilience

Treatment of Polluted Urban Surface Waters by Sponge Based Aerobic Biofilm Reactor: Purification Performances and Resilience

Sustained organic loading disturbance favors nitrite accumulation in bioreactors with variable resistance, recovery and resilience of nitrification and nitrifiers

Sustained organic loading disturbance favors nitrite accumulation in bioreactors with variable resistance, recovery and resilience of nitrification and nitrifiers

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