Effects of Long Exposure to Low Temperatures on Nitrifying Biofilm and Biomass in Wastewater Treatment

Delatolla, Robert; Tufenkji, Nathalie; Comeau, Yves; Gadbois, Alain; Lamarre, Daniel; Berk, Dimitrios

doi:10.2175/106143012x13354606450924

Cited by 37 publications

(10 citation statements)

References 39 publications

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“…1b), indicating that soil moisture is not the main factor causing differences in N 2 O emission between treatments. It is known that low temperature mainly influences microbial metabolic rates (Hulsen et al 2016), which leads to the deterioration of nitrification (Chen et al 2018;Delatolla et al 2012;Hoang et al 2014). In addition, low temperatures exert an influence on the amount of nitrifying bacteria (Siripong and Rittmann 2007).…”

Section: N 2 O Fluxmentioning

confidence: 99%

CO2, CH4 and N2O fluxes in an alpine meadow on the Tibetan Plateau as affected by N-addition and grazing exclusion

Luo

Wang

Zhang

et al. 2020

Nutr Cycl Agroecosyst

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Limited understanding of the effects of enhanced nitrogen (N) addition and grazing exclusion (E) on greenhouse gases fluxes (GHGs: CO 2 , CH 4 , and N 2 O) in grasslands constrains our ability to respond to the challenges of future climate change. In this study, we conducted a field experiment using a static closed opaque chamber to investigate the response of GHG fluxes to N addition (69 kg N ha-1 year-1 applied in 3 splits) and grazing exclusion in an alpine meadow on the Tibetan Plateau during the growing seasons from 2011 to 2013. Our results showed that winter grazing significantly raised soil temperature (ST), while grazing exclusion (E) had no effect on soil moisture (SM), and N fertilizer (F) had no effect on ST or SM. Aboveground biomass (AB) and root biomass (RB) were not significantly affected by E in 2011-2013 (p [ 0.05), but F significantly affected AB and RB (p \ 0.05). Compared with winter grazing, only E substantially reduced seasonal mean CO 2 emissions (by about 20.1%) during the experimental period. E did not significantly directly affect CH 4 uptake, whereas N addition reduced seasonal mean CH 4 uptake by about 6.5%, and N addition changed seasonal average absorption of N 2 O into an emission source. CO 2 flux is the major contributor to CO 2 equivalent emissions in this area. Our results indicate that exclosure from livestock grazing might be a promising measure to reduce CO 2 emissions, while enhanced N addition might reduce CH 4 uptake and increase N 2 O emission in the alpine meadow under future climate change.

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Section: N 2 O Fluxmentioning

confidence: 99%

CO2, CH4 and N2O fluxes in an alpine meadow on the Tibetan Plateau as affected by N-addition and grazing exclusion

Luo

Wang

Zhang

et al. 2020

Nutr Cycl Agroecosyst

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“…In our experiments, the biofilms in 1st stage dropped off and were replaced during 20-25 days while the biofilms in 2nd stage and 3rd were maintained well up to 40-60 days. It was reported that attrition rather than sloughing is the prevailing biomass loss mechanism [32]. According to the loss amount of biomass in basin, the sludge age was roughly 28-35 days.…”

Section: Effect Of Influent Concentration On Bodmentioning

confidence: 99%

Treatment of Antibiotic Pharmaceutical Wastewater Using a Rotating Biological Contactor

Zhang

Wang

et al. 2015

Journal of Chemistry

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Rotating biological contactors (RBC) are effective for treating wastewater, while they are rarely reported to be used for treating antibiotic pharmaceutical wastewater (APW). The current study investigates treatment of APW using an RBC. The effects of influent concentration, number of stages, and temperature on the remediation of APW were studied. The results indicated, even at low ambient temperature, 45% COD and 40%NH4+-N removal efficiencies. Moreover, the BOD5removal efficiency was 85%. Microscopic observations illustrated that there were various active microorganisms displayed in the biofilms and their distribution changed from stage to stage. Compared with activated sludge, the biofilms in this study have higher content of dry matter and are easier to dehydrate and settle. Compared with current commercial incineration processes or advanced oxidation processes, RBC can greatly reduce the treatment cost. This research shows RBC is effective for such an inherently biorecalcitrant wastewater even at low ambient temperature.

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“…It frequently dictates footprint and energy use in biological wastewater treatment (McCarty et al ., 2011; Liu et al ., 2018), and is also a common candidate for process disruption (Siripong and Rittman, 2007), owing to its dependence on two interdependent groups of slow-growing autotrophs: ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB). AOB maintain a stable population during long-term low-temperature periods, even when the nitrification process fails (Delatolla et al ., 2012; Johnston et al ., 2019). AOB were also shown to be more resistant and resilient than NOB under a sustained operational disturbance where the organic loading to replicate bioreactors was changed (Santillan et al .…”

Section: Introductionmentioning

confidence: 99%

Metagenomics and Metatranscriptomics Suggest Pathways of 3-Chloroaniline Degradation in Wastewater Reactors

Seshan

Santillan

Constancias

et al. 2021

Preprint

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Biological wastewater treatment systems are often affected by major shifts in influent quality, including the input of various toxic chemicals. Yet the mechanisms underlying adaptation of activated sludge process performance when challenged with a sustained toxin input have not been studied in a controlled and replicated experiment. Three replicate bench-scale bioreactors were subjected to a chemical disturbance in the form of 3-chloroaniline (3-CA) input over 132 days, following an acclimation period of 58 days, while three control reactors received no 3-CA input. The nitrification process was initially affected by 3-CA input; yet all three treatment reactors evolved to biologically degrade 3-CA within three weeks of the experiment, resulting in partial nitrification recovery. 16S rRNA amplicon sequencing revealed that ammonia oxidizers were initially impacted by 3-CA, and a new ammonia oxidizing community emerged with the onset of 3-CA degradation. Combining process and microbial community data from amplicon sequencing with potential functions gleaned from assembled metagenomics and metatranscriptomics data, 3-CA degradation was shown to likely occur via a phenol monooxygenase followed by ortho-cleavage of the aromatic ring. The relative abundance of genera Gemmatimonas, Saprospiraceae OLB8 and Taibaiella correlated significantly with 3-CA degradation. This study demonstrated the impact of a sustained stress on the activated sludge community and wastewater treatment process and its subsequent recovery. Using a combination of techniques in a controlled and replicated experiment, we showed that microbial communities can evolve degradative capacity following a sustained xenobiotic input, specific functions like nitrification can fully or partially recover and targeted culture-independent approaches can be used to elucidate the mechanisms of adaptation.

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Effects of Long Exposure to Low Temperatures on Nitrifying Biofilm and Biomass in Wastewater Treatment

Cited by 37 publications

References 39 publications

CO2, CH4 and N2O fluxes in an alpine meadow on the Tibetan Plateau as affected by N-addition and grazing exclusion

CO2, CH4 and N2O fluxes in an alpine meadow on the Tibetan Plateau as affected by N-addition and grazing exclusion

Treatment of Antibiotic Pharmaceutical Wastewater Using a Rotating Biological Contactor

Metagenomics and Metatranscriptomics Suggest Pathways of 3-Chloroaniline Degradation in Wastewater Reactors

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