Performance of the anammox process treating low-strength municipal wastewater under low temperatures: Effect of undulating seasonal temperature variation

Gong, Xuzhong; Wang, Bo; Qiao, Xin; Gong, Qingteng; Liu, Xuefan; Peng, Yongzhen

doi:10.1016/j.biortech.2020.123590

Cited by 61 publications

(6 citation statements)

References 45 publications

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“…Each test lasted for 12 h at 34°C in a shaker incubator (120 rpm). Samples (3 ml) were taken every 30 min to determine the concentration of NH 4 + ‐N, NO 2 − ‐N, and NO 3 − ‐N during the first 3 h. Subsequently, samples were taken every hour, and the SAA was calculated using Equation (Gong et al, 2020).

SAA goodbreak= \frac{∆ TN}{normalt \times MLVSS},

where ∆TN and t refer to the variation in the TN concentration (mg/L) and reaction time (h), respectively.…”

Section: Methodsmentioning

confidence: 99%

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Effects of alkalinity addition with different strategies on CANON process: Start‐up, performance, and microbial community

Liu

Zhou

Liang

et al. 2022

Water Environment Research

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The effects of alkalinity addition with different strategies on the start-up, performance, and microbial community of completely autotrophic nitrogen removal over nitrite (CANON) were investigated over 450 days. In phase I, the alkalinity was increased gradually from 300 to 2,000 mg/L to obtain the optimal range. In phase II, the reactor was restarted to verify the appropriate alkalinity value of 1,600 mg/L. The fact that it only took 90 days (phase I: 170 days) to complete the start-up of CANON in phase II demonstrated that an alkalinity value of 1,600 mg/L was suitable when the influent NH 4 + -N concentration was 200 mg/L (alkalinity/NH 4 + -N = 8:1). The slope (k = 2.00) of NH 4 + -N concentration decrease in phase II during the start-up process was significantly higher than that in phase I (k = 1.50). High removal efficiencies of NH 4 + -N (98%) and TN (80%) were attained in both phases. Specific anaerobic ammonium oxidation (anammox) activity tests showed that the anammox activity of the two phases reached 3.31 and 5.31 mg TN/(g VSSÁh), respectively.High-throughput sequencing analysis revealed that appropriate alkalinity could promote the enrichment of Candidatus Brocadia, C. Jettenia, and C. Kuenenia (total abundance of 31.96%) while effectively inhibiting Nitrospira (abundance of less than 0.50%). Practitioner Points• An alkalinity/NH 4 + -N ratio of 8 promoted the rapid start-up and stable performance of CANON. • NH 4+ -N and TN removal efficiencies of 98% and 80%, respectively, were obtained. • High alkalinity promoted the enrichment of Candidatus Brocadia, Candidatus Jettenia, Candidatus Kuenenia and inhibited Nitrospira.

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SAA goodbreak= \frac{∆ TN}{normalt \times MLVSS},

where ∆TN and t refer to the variation in the TN concentration (mg/L) and reaction time (h), respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Each test lasted for 12 h at 34 C in a shaker incubator (120 rpm). Samples (3 ml) were taken every 30 min to determine the concentration of NH 4 + -N, NO 2 À -N, and NO 3 À -N during the first 3 h. Subsequently, samples were taken every hour, and the SAA was calculated using Equation 3 (Gong et al, 2020).…”

Section: Chemical Analysismentioning

confidence: 99%

Effects of alkalinity addition with different strategies on CANON process: Start‐up, performance, and microbial community

Liu

Zhou

Liang

et al. 2022

Water Environment Research

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“…And this study obtained the similar conclusion. The related studies showed that the variations in environmental temperature will lead to the variations of dominant bacteria in Anammox sludge (Ali & Okabe, 2015;Gong et al, 2020). Zeng et al (2015) found that Candidatus Kuenenia has stronger adaptability as the ambient temperature dropped from 23°C to 16°C and became the dominant Anammox bacteria in the Anammox biofilter.…”

Section: Effect Of Adding Ahls Inhibitor On the Activity Of Anammox Granules At Different Operation Temperaturesmentioning

confidence: 99%

“…Zeng et al (2015) found that Candidatus Kuenenia has stronger adaptability as the ambient temperature dropped from 23°C to 16°C and became the dominant Anammox bacteria in the Anammox biofilter. The study of Gong et al (2020) showed that the temperature decline from 17.9°C to 15.1°C triggered the abundance decrease in anammox populations. Notably, after 43 days of 15.1°C exposure, the abundance of Candidatus Brocadia and Candidatus Kuenenia increased to 2.5% from 1.8% and 0.12% from 0.03% respectively whereas Candidatus Anammoximicrobium showed no increase, which suggested that the anammox genera had different resilience to lower temperature.…”

Section: Effect Of Adding Ahls Inhibitor On the Activity Of Anammox Granules At Different Operation Temperaturesmentioning

confidence: 99%

Effects of AHLs inhibitors and exogenous AHLs on the stability and activity of Anammox granules at low temperatures

Zhang

Zhang²,

Sun³

et al. 2021

Water Environment Research

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This study investigated the relationship between acyl homoserine lactones (AHLs)based quorum sensing (QS) and the properties of Anammox granular sludge at low temperatures (11-23°C). Results indicated that adding different concentrations of AHLs inhibitors reduced the content of N-hexanoyl-dl-homoserine lactone (C6-HSL) and N-octanoyl-dl-homoserinelactone (C8-HSL) in Anammox granules on different degrees at different operation temperatures, which led to the deterioration of granules stability and activity. The important role of endogenous C6-HSL and C8-HSL signals in maintaining Anammox granular sludge stability and activity in low-temperature conditions was revealed. In addition, in the process of reducing operation temperatures, another type of AHL signal (N-(3-oxooctanoyl)-l-homoserine lactone, 3OC8-HSL) was released by Anammox granules. The effects of exogenous C8-HSL on the strength, average diameter, and density of Anammox granules were closely related to the operation temperature. When the operation temperature ranged from 11°C to 16°C, the stability of granules could be significantly improved by exogenous C8-HSL. In addition, the addition of C6-HSL and 3OC8-HSL promoted the activity of Anammox granules when the operation temperatures of the reactors were 11-23°C. This study proposed a novel approach to improve the properties of Anammox granules at low temperatures from the perspective of QS. • Practitioner points• Endogenous AHLs played an important role in maintaining the activity and stability of Anammox granules at 11-23°C. • Exogenous C8-HSL improved the granules stability at the low temperature of 11-16°C. • Exogenous C6-HSL or 3OC8-HSL promoted the granules activity at 11-23°C.• Supply a novel way to improve the Anammox granules performance at low temperatures.

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“…This is the reason why if the agricultural management of digestate is not possible, then its biological treatment, which is regarded as the most economical process for nitrogen removal, may be a rational solution [7,10]. Currently, researchers are attracted to technologies that can be used for anaerobic ammonium oxidizing (anammox), which enables the treatment of wastewater with a high NH 4 -N content [11]. However, the problems associated with the fragile resistance of anammox bacteria to environmental changes, the low growth rate of these bacteria, and limits placed on maximum nitrogen removal efficiency constitute major obstacles to the wide range application for these processes [12].…”

Section: Introductionmentioning

confidence: 99%

Challenges in Treatment of Digestate Liquid Fraction from Biogas Plant. Performance of Nitrogen Removal and Microbial Activity in Activated Sludge Process

Chuda¹,

Ziemiński²

2021

Energies

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Even thoughdigestate, which is continually generated in anaerobic digestion process, can only be used as fertilizer during the growing season, digestate treatment is still a critical, environmental problem. That is why the present work aims to develop a method to manage digestate in agricultural biogas plant in periods when its use as fertilizer is not possible. A lab-scale system for the biological treatment of the digestate liquid fraction using the activated sludge method with a separate denitrification chamber was constructed and tested. The nitrogen load that was added tothe digestate liquid fraction accounted for 78.53% of the total nitrogen load fed into the reactor. External carbon sources, such as acetic acid, as well as flume water and molasses, i.e., wastewater and by-products from a sugar factory, were used to support the denitrification process. The best results were obtained using an acetic acid and COD (Chemical Oxygen Demand)/NO3–N (Nitrate Nitrogen) ratio of 7.5. The removal efficiency of TN (Total Nitrogen), NH4–N (Ammonia Nitrogen) and COD was 83.73%, 99.94%, 86.26%, respectively. It was interesting to see results obtained that were similar to those obtained when using flume water and COD/NO3–N at a ratio of 8.7. This indicates that flume water can be used as an alternative carbon source to intensify biological nitrogen removal from digestate.

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Performance of the anammox process treating low-strength municipal wastewater under low temperatures: Effect of undulating seasonal temperature variation

Cited by 61 publications

References 45 publications

Effects of alkalinity addition with different strategies on CANON process: Start‐up, performance, and microbial community

Effects of alkalinity addition with different strategies on CANON process: Start‐up, performance, and microbial community

Effects of AHLs inhibitors and exogenous AHLs on the stability and activity of Anammox granules at low temperatures

Challenges in Treatment of Digestate Liquid Fraction from Biogas Plant. Performance of Nitrogen Removal and Microbial Activity in Activated Sludge Process

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