Start‐up strategy and bacterial community analysis of SNAD process for treating anaerobic digester liquor of swine wastewater (ADLSW) in a continuous‐flow biofilm reactor

Xin, Xin; Liu, Qin; Werner, David; Lu, Hangyong Ray; Qin, Jiawei

doi:10.1111/wej.12568

Cited by 18 publications

(4 citation statements)

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“…Anaerobic digestion (AD) is the best alternative to aerobic processes for the treatment of strong wastewaters (Gao et al, 2020; Garg et al, 2020; Ulgudur & Demirer, 2019; Xin et al, 2020), but there are some disadvantages, such as (i) biological nitrogen and phosphorus removal is not possible; (ii) requirement for further treatment with a subsequent aerobic treatment process in series to meet discharge requirements; and (iii) difficulties in achieving stable reactor performance as a result of sensitivity to fluctuations in temperature and operating conditions (Ambaye et al, 2021; Andalib et al, 2011; Metcalf & Eddy, 2014).…”

Section: Introductionmentioning

confidence: 99%

Significant cost savings using a newly developed single‐process technology compared to conventional processes for treating high‐strength effluents

Hosseinlou

2022

Water & Environment J

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This study investigates the performance of a newly developed technology, known as simultaneous anaerobic oxidation/partial nitrification-denitrification (SAO/PND), for treating strong wastewater under laboratory conditions. Excellent results are achieved, with maximum chemical oxygen demand (COD) and nitrogen removal of 98% and 96%, respectively, when treating synthetic wastewater with influent 4120 mg/L COD and 210 mg/L NH 4 + -N. Appropriate living environment in this single-process technology favoured the co-existence of various bacterial communities, and removal mechanisms by these organisms are identified and confirmed. The results showed that the single-process SAO/PND technology required 95% and 90% less oxygen compared to conventional aerobic processes and combined systems, respectively. Furthermore, this newly developed technology produced 60% and 44% less sludge, respectively, in comparison with the mentioned conventional systems.This study shows that the single-process SAO/PND technology is a promising sustainable alternative to conventional systems, as it combines high efficiency and cost-effectiveness with simple operation and maintenance requirements.

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Section: Introductionmentioning

confidence: 99%

Significant cost savings using a newly developed single‐process technology compared to conventional processes for treating high‐strength effluents

Hosseinlou

2022

Water & Environment J

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“…Biological nitri cation and denitri cation procedures have been widely applied to ammonium-rich WWTPs (Lan et al 2010;Muhammad et al 2015), in which ammonia is rstly transformed to nitrate via nitri cation, with nitrate then converted to nitrogen gas by anoxic biotransformation using organic carbon as an electron source ). However, biological nitri cation and denitri cation is not the most effective process in nitrogen removal owing to the high oxygen demand of complete nitri cation, the heterotrophic denitri cation requires an external carbon source, accompanied by the production of sludge and nitrous oxide (N 2 O) (Shalini et al 2012;Wang et al 2018;Xin et al 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Denitri cation is an important process for nitrogen removal while nitri cation is an essential intermediate process transforming ammonia to nitrite or nitrate. However, despite nitri cation being an essential and rate-limiting step in microbial nitrogen-cycling networks, the role of nitri cation in anammox-inoculated WWTPs has not been comprehensively understood in current available researches (Cortés-Lorenzo et al 2015;Wang et al 2018;Xin et al 2020;Egli et al 2003;Zheng et al 2017) and the community microbial activity of the major nitri ers in anammox-driven WWTPs remain unknown. A more complete understanding of nitri cation can increase the e ciency of nitrogen removal in anammoxinoculated WWTPs.…”

Section: Introductionmentioning

confidence: 99%

Nitrification mainly driven by ammonia-oxidizing bacteria and nitrite-oxidizing bacteria in an anammox-inoculated wastewater treatment system

Lü

Hong

Ying

et al. 2021

Preprint

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Anaerobic ammonium oxidation (anammox) process has been acknowledged as an environmentally friendly and time-saving technique capable of achieving efficient nitrogen removal. However, the community of nitrification process in anammox-inoculated wastewater treatment plants (WWTPs) has not been elucidated. In this study, ammonia oxidation (AO) and nitrite oxidation (NO) rates were analyzed with the incubation of activated sludge from Xinfeng WWTPs (Taiwan, China), and the community composition of nitrification communities were investigated by high-throughput sequencing. Results in this paper have showed that both AO and NO had strong potential activity in the activated sludge. The average rates of AO and NO in sample A were 6.51 µmol·L -1 ·h -1 and 6.52 µmol·L -1 ·h -1 , respectively, while the rates in sample B were 14.48 µmol·L -1 ·h -1 and 14.59 µmol·L -1 ·h -1 , respectively. The abundance of the nitrite-oxidizing bacteria (NOB) Nitrospira was 0.89-4.95×10 11 copies/g in both samples A and B, and the abundance of ammonia-oxidizing bacteria (AOB) was 1.01- 9.74×10 9 copies/g. In contrast, the abundance of ammonia-oxidizing archaea (AOA) was much lower than AOB, only with 1.28-1.53×10 5 copies/g in samples A and B. The AOA community was dominated by Nitrosotenuis , Nitrosocosmicus, and Nitrososphaera, while the AOB community mainly consisted of Nitrosomonas and Nitrosococcus . The dominant species of Nitrospira were Candidatus Nitrospira defluvii, Candidatus Nitrospira Ecomare2 and Nitrospira inopinata . In summary, the strong nitrification activity was mainly catalyzed by AOB and Nitrospira , maintaining high efficiency in nitrogen removal in the anammox-inoculated WWTPs by providing the substrates required for denitrification and anammox processes.

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“…Pertencem a esta família bactérias aeróbias heterotróficas e algumas espécies, como a Aquamicrobium, que podem usar nitrato como um aceptor final elétrons alternativo (Willems, 2014). e SNAD (simultaneous nitrification anammox and denitrification) (Mi et al, 2017;Xin et al, 2020;Zhang and Liu, 2014;Zhao et al, 2018). O papel que este grupo desempenha no consorcio microbiano não é claro, mas há evidencias de que essas bactérias são capazes de consumir amônia (Zhang and Liu, 2014).…”

Section: Caracterização Filogenéticaunclassified

Reator de biofilme fixo aerado submetido à contra-difusão de aceptores e doadores de elétrons para remoção de compostos nitrogenados

Silva¹

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A novel foam aerated biofilm reactor (FABR) was evaluated to remove nitrogen and COD from synthetic wastewater. This new reactor configuration establishes a counter-diffusion biofilm like the well-known membrane aerated bioreactor (MABR), however using polyurethane foam as the support material and aeration system by air diffuser. It is especially well suited for wastewaters with low COD/N ratios. In FABR, a polyurethane foam sheet separates the aerobic compartment, which received the aeration, and the anoxic compartment, which received the effluent. Foams sheets with thicknesses of 10, 5 and 2 mm and synthetic wastewater with COD/N ratios of 5 and 2.5 were evaluated. The 2 mm thick foam reactor did not show good biomass adherence and, therefore, did not show N removal efficiency. The 5 and 10 mm reactors, in both COD/N ratios, showed an average total nitrogen removal efficiency from 36 to 46%. The denitrification efficiency was 100% throughout the experimental period.Lower values of polyurethane foam thickness and COD/N ratio did not provide a higher nitrification rate, as expected. Throughout the operation, biomass growth was associated with a decrease in nitrification efficiency, which was restored after biomass removal. It was concluded that the greatest limitation of the system is associated with mass transfer resistance in the biofilm and not with the thickness of the foam layer. The increase in this resistance occurred due to the biomass growth inside the foam, leading to pore clogging and creating barriers to efficient mass transport. A mathematical model was developed to describe the mass transport in the foam. The effective diffusivity and porosity of the biofilm were determined experimentally and incorporated into the model. The value of the effective diffusivity proved to be more significant for the results of the model. Gradients of oxygen, nitrate, nitrite and ammonia concentration through the biofilm were measured using microsensors and compared with the values calculated by the model. It was concluded that the foam fiber and bacterial cell complex can be considered as a biofilm, as long as it is considered adequate effective diffusivity, which depends on biomass growth within the foam pores.

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Start‐up strategy and bacterial community analysis of SNAD process for treating anaerobic digester liquor of swine wastewater (ADLSW) in a continuous‐flow biofilm reactor

Cited by 18 publications

References 43 publications

Significant cost savings using a newly developed single‐process technology compared to conventional processes for treating high‐strength effluents

Significant cost savings using a newly developed single‐process technology compared to conventional processes for treating high‐strength effluents

Nitrification mainly driven by ammonia-oxidizing bacteria and nitrite-oxidizing bacteria in an anammox-inoculated wastewater treatment system

Reator de biofilme fixo aerado submetido à contra-difusão de aceptores e doadores de elétrons para remoção de compostos nitrogenados

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