Pilot-scale demonstration of one-stage partial nitritation/anammox process to treat wastewater from a coal to ethylene glycol (CtEG) plant

Yao, Hong; Zhao, Xingcheng; Fan, Liru; Jia, Fangxu; Chen, Yao; Cai, Weiwei; Guo, Jianhua

doi:10.1016/j.envres.2021.112540

Cited by 13 publications

(5 citation statements)

References 34 publications

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“…The lower DO of this system (< 0.5 mg⋅L –1 ) allowed the above facultative anaerobic denitrifiers to reside in the flocculent sludge, thus acquiring more organics to provide a better habitat for AnAOB ( Yang et al, 2019a ). Moreover, such community distribution could further improve the total nitrogen removal efficiency of the PN/A system by reducing effluent nitrate (partial denitrification process), which has been confirmed by our previous study ( Yao et al, 2021 ).…”

Section: Discussionsupporting

confidence: 78%

“…During this stage, the nitrogen removal rate (NRR) was 0.5 ± 0.1 kg N⋅m –3 ⋅day –1 , the COD removal rate was 62.0 ± 11.5%, and the total nitrogen removal efficiency (NRE) was 79.6 ± 4.4%. Furthermore, the values of the ratio between nitrate production and ammonium consumption (1.5 ± 2.3%) were obviously lower than the theoretical value of 11% ( Miao et al, 2016 ), which were confirmed to be associated with the NO 3 – -N reduction process by denitrification ( Yao et al, 2021 ). In addition, the evolution of the pollutant concentration in each chamber of the reactor was also analyzed on day 132 ( Figure 2B ).…”

Section: Resultsmentioning

confidence: 80%

“…Additionally, the polyurethane sponge carriers (size of 10 × 10 × 10 mm, density of 0.9 g⋅cm –3 , and specific surface area of 2,800 m 2 ⋅m –3 ) were fixed in the reactor with a special design as follows: the sponge carriers were first filled into spherical cages and connected together with steel wires, and then the steel wires were fixed to the shelves ( Supplementary Figure 2 ). In addition, the detail of the operational procedure and the wastewater characteristics were as previously reported ( Yao et al, 2021 ).…”

Section: Methodsmentioning

confidence: 99%

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Morphological and Spatial Heterogeneity of Microbial Communities in Pilot-Scale Autotrophic Integrated Fixed-Film Activated Sludge System Treating Coal to Ethylene Glycol Wastewater

et al. 2022

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The understanding of microbial compositions in different dimensions is essential to achieve the successful design and operation of the partial nitritation/anammox (PN/A) process. This study investigated the microbial communities of different sludge morphologies and spatial distribution in the one-stage PN/A process of treating real coal to ethylene glycol (CtEG) wastewater at a pilot-scale integrated fixed-film activated sludge (IFAS) reactor. The results showed that ammonia-oxidizing bacteria (AOB) was mainly distributed in flocs (13.56 ± 3.16%), whereas anammox bacteria (AnAOB) was dominated in the biofilms (17.88 ± 8.05%). Furthermore, the dominant AnAOB genus in biofilms among the first three chambers was Candidatus Brocadia (6.46 ± 2.14% to 11.82 ± 6.33%), whereas it was unexpectedly transformed to Candidatus Kuenenia (9.47 ± 1.70%) and Candidatus Anammoxoglobus (8.56 ± 4.69%) in the last chamber. This demonstrated that the niche differentiation resulting from morphological (dissolved oxygen) and spatial heterogeneity (gradient distribution of nutrients and toxins) was the main reason for dominant bacterial distribution. Overall, this study presents more comprehensive information on the heterogeneous distribution and transformation of communities in PN/A processes, providing a theoretical basis for targeted culture and selection of microbial communities in practical engineering.

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Section: Discussionsupporting

confidence: 78%

Section: Resultsmentioning

confidence: 80%

Section: Methodsmentioning

confidence: 99%

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Morphological and Spatial Heterogeneity of Microbial Communities in Pilot-Scale Autotrophic Integrated Fixed-Film Activated Sludge System Treating Coal to Ethylene Glycol Wastewater

et al. 2022

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“…These findings would thus tend to indicate that Fe 3+ may promote the nitrification capacity of the system. Among the 21 genera characterized by denitrification activity, norank_f_PHOS-HE36 , norank_f_Caldilineaceae , Terrimona , Dokdonella , and unclassified_f_Blastocatellaceae ( Sheng et al, 2021 ; Yao et al, 2022 ) were identified as being the most abundant (>1%). In the presence of 30 mg/L Fe 3+ , the relative abundance of norank_f_PHOS-HE36 peaked at 6.36%, which was approximately 2.…”

Section: Resultsmentioning

confidence: 99%

Effect of Fe3+ on the nutrient removal performance and microbial community in a biofilm system

Zhong

Pang³

et al. 2023

Front. Microbiol.

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In this study, the influence of Fe3+ on N removal, microbial assembly, and species interactions in a biofilm system was determined. The results showed that maximum efficiencies of ammonia nitrogen (NH4+-N), total nitrogen (TN), phosphorus (P), and chemical oxygen demand (COD) removal were achieved using 10 mg/L Fe3+, reaching values of 100, 78.85, 100, and 95.8%, respectively, whereas at concentrations of 15 and 30 mg/L Fe3+ suppressed the removal of NH4+-N, TN, and COD. In terms of absolute abundance, the expression of bacterial amoA, narG, nirK, and napA was maximal in the presence of 10 mg/L Fe3+ (9.18 × 105, 8.58 × 108, 1.09 × 108, and 1.07 × 109 copies/g dry weight, respectively). Irrespective of Fe3+ concentrations, the P removal efficiency remained at almost 100%. Candidatus_Competibacter (10.26–23.32%) was identified as the most abundant bacterial genus within the system. Determinism (50%) and stochasticity (50%) contributed equally to microbial community assembly. Co-occurrence network analysis revealed that in the presence of Fe3+, 60.94% of OTUs in the biofilm system exhibited positive interactions, whereas 39.06% exhibited negative interactions. Within the OTU-based co-occurrence network, fourteen species were identified as key microbes. The stability of the system was found to be predominantly shaped by microbial cooperation, complemented by competition for resources or niche incompatibility. The results of this study suggested that during chemical P removal in wastewater treatment plants using biofilm methods, the concentration of supplemental Fe3+ should be maintained at 10 mg/L, which would not only contribute to P elimination, but also enhance N and COD removal.

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“…ANAMMOX process has mainly been applied to treat high-strength NH 4 + -containing wastewater ( Lackner et al, 2014a ). This include reject wastewater, landfill leachate and industrial wastewater ( Azari et al, 2017 ; Yao et al, 2022 ). Meanwhile, research on the development of mainstream anammox is ongoing.…”

Section: Anammox-mediated Nitrogen Removalmentioning

confidence: 99%

Biological nitrogen removal from low carbon wastewater

et al. 2022

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Nitrogen has traditionally been removed from wastewater by nitrification and denitrification processes, in which organic carbon has been used as an electron donor during denitrification. However, some wastewaters contain low concentrations of organic carbon, which may require external organic carbon supply, increasing treatment costs. As a result, processes such as partial nitrification/anammox (anaerobic ammonium oxidation) (PN/A), autotrophic denitrification, nitritation-denitritation and bioelectrochemical processes have been studied as possible alternatives, and are thus evaluated in this study based on process kinetics, applicability at large-scale and process configuration. Oxygen demand for nitritation-denitritation and PN/A is 25% and 60% lower than for nitrification/denitrification, respectively. In addition, PN/A process does not require organic carbon supply, while its supply for nitritation-denitritation is 40% less than for nitrification/denitrification. Both PN/A and nitritation-denitritation produce less sludge compared to nitrification/denitrification, which saves on sludge handling costs. Similarly, autotrophic denitrification generates less sludge compared to heterotrophic denitrification and could save on sludge handling costs. However, autotrophic denitrification driven by metallic ions, elemental sulfur (S) and its compounds could generate harmful chemicals. On the other hand, hydrogenotrophic denitrification can remove nitrogen completely without generation of harmful chemicals, but requires specialized equipment for generation and handling of hydrogen gas (H2), which complicates process configuration. Bioelectrochemical processes are limited by low kinetics and complicated process configuration. In sum, anammox-mediated processes represent the best alternative to nitrification/denitrification for nitrogen removal in low- and high-strength wastewaters.

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Pilot-scale demonstration of one-stage partial nitritation/anammox process to treat wastewater from a coal to ethylene glycol (CtEG) plant

Cited by 13 publications

References 34 publications

Morphological and Spatial Heterogeneity of Microbial Communities in Pilot-Scale Autotrophic Integrated Fixed-Film Activated Sludge System Treating Coal to Ethylene Glycol Wastewater

Morphological and Spatial Heterogeneity of Microbial Communities in Pilot-Scale Autotrophic Integrated Fixed-Film Activated Sludge System Treating Coal to Ethylene Glycol Wastewater

Effect of Fe3+ on the nutrient removal performance and microbial community in a biofilm system

Biological nitrogen removal from low carbon wastewater

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