Enhanced microbial metabolism in one stage partial nitritation-anammox system treating low strength wastewater by novel composite carrier

Lv, Yanna; Pan, Juejun; Huo, Tangran; Zhao, Yunpeng; Liu, Sitong

doi:10.1016/j.watres.2019.114872

Cited by 98 publications

(17 citation statements)

References 52 publications

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“…Lately, a novel carrier combined with zeolites and floating materials was synthesized and applied to enrich AnAOB. Zeolite is able to adsorb ammonium, which is beneficial to providing a relatively high ammonia microenvironment for anammox growth under mainstream condition (Lv, Pan, Huo, Zhao, & Liu, 2019). Further studies regarding the development of carrier with high hydrophobicity, porosity, roughness, and adsorption ability over ammonium are highly expected.…”

Section: Configurations For Mainstream Application Of Anammoxmentioning

confidence: 99%

Advances and challenges of mainstream nitrogen removal from municipal wastewater with anammox‐based processes

Huang

et al. 2020

Water Environment Research

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Anaerobic ammonium oxidation (anammox) is a novel process of deammonification that exhibits superior ecological and economic potential compared to that of traditional heterotrophic processes. Although this process has been successfully implemented in treating high‐strength nitrogen‐contaminated wastewater, it still faces many challenges in treating mainstream municipal wastewater. This review aims to provide an overview of the status and challenges of mainstream anammox‐based processes. The different configurations and crucial factors are discussed in this review. Finally, the future needs for feasible application are stated. Practitioner points Factors restricting mainstream application of anammox‐based processes are reviewed. Control strategies for selecting and maintaining anammox bacteria are discussed. Recent advances in nitrite production via partial nitrification or denitrification are summarized. Future needs for the feasible application of anammox‐based nitrogen removal technology for mainstream municipal wastewater treatment are outlined.

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Section: Configurations For Mainstream Application Of Anammoxmentioning

confidence: 99%

Advances and challenges of mainstream nitrogen removal from municipal wastewater with anammox‐based processes

Huang

et al. 2020

Water Environment Research

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“…Besides, amino-acid metabolism also characterizes the intracellular material metabolism. Arginine and proline metabolism and peptidases third-level pathway in the amino-acid metabolism, which played an important role in the synthesis of protein [35,36] and were potentially engaged in the breakdown of EPS [37], respectively, were downregulated at L1/L0, indicating the weakened degradation of extracellular protein. While increased La (III) were applied in the system, both were upregulated at L3/L2 and L4/L3, which indicated the enhanced decomposition of EPS.…”

Section: Functional Genes Associated With Eps Productionmentioning

confidence: 99%

Responses of Anammox Granular Sludge to Long-Term Rare Earth Element Feeding: Lanthanum as a Case

Huang

2020

Sustainability

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A tremendous input of ammonium and rare earth elements (REEs) has entered the surroundings on account of the discharge and leak of leaching agents during rare earth in-suit leaching mining, which has threatened various organisms. Anammox has the potential to release nitrogen contamination, but the potential impacts of REEs on anammox bacteria remain unclear. In this study, La (III) was chosen as a case to explore the long-term impacts on anammox granular sludge. The 5 mg L−1 La (III) which was examined hardly affected the anammox granulates because of the defense of extracellular polymeric substances. The high La concentrations (10–50 mg L−1) caused intercellular accumulation and the significant inhibition of nitrogen removal performance and dehydrogenase activity, especially a decrease in the relative abundance of Ca. Kuenenia. Moreover, it also induced patently oxidative damage and affected cell membrane integrity. Notably, extracellular polymeric substances have a limited defense capability; neither La3+ nor Ca2+/Mg2+ efflux-related genes aggravated the intracellular accumulation of La.

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“…Low ammonia effluent with fluctuating dissolved oxygen (DO) content or pH causes a high growth of nitrite-oxidizing bacteria (NOB), which affects the NAE. In order to maintain the partial nitritation, it is necessary to effectively control the growth of nitrifying bacteria in the reactor system ( Lv et al, 2019 ), with the inhibition of NOB bacterial growth requiring that the DO content in the reactor is controlled to a low range (<0.5 mg/L) ( Duan et al, 2011 ; Tomaszewski et al, 2017 ; Wen et al, 2017 ). The lower DO content not only limits the growth of NOB, but also limits the ammonia oxidation rate (AOR) of ammonium oxidation bacteria (AOB), resulting in nitritation being unable to provide sufficient nitrite for the anaerobic ammonia oxidation process, which directly affects the anammox denitrification rate.…”

Section: Introductionmentioning

confidence: 99%

“…For example, high ammonium conditions could be formed around zeolite, which are favorable for the growth of AOB ( Miladinovic and Weatherley, 2008 ). The composite carriers based on zeolite could probably promote the metabolism of AOB and limit the activity of NOB ( Lv et al, 2019 ). Montmorillonite could catalyze nucleic synthesis and may also play a role in the formation of primitive lipid-based membranes ( Yang et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Different Carriers to Maintain a Stable Partial Nitrification Process for Low-Strength Wastewater Treatment

Zhang

Liu

2022

Front. Bioeng. Biotechnol.

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Practical application of the partial nitritation–anaerobic ammonium oxidation (anammox) process has attracted increasing attention because of its low operational costs. However, the nitritation process, as a promising way to supply nitrite for anammox, is sensitive to the variations in substrate concentration and dissolved oxygen (DO) concentration. Therefore, a stable supply of nitrite becomes a real bottleneck in partial nitritation–anammox process, limiting their potential for application in mainstream wastewater treatment. In this study, five 18-L sequencing batch reactors were operated in parallel at room temperature (22°C ± 4°C) to explore the nitritation performance with different carrier materials, including sepiolite-nonwoven carrier (R1), zeolite-nonwoven carrier (R2), brucite-nonwoven carrier (R3), polyurethane carrier (R4), and nonwoven carrier (R5). The ammonia oxidation rate (AOR) in R1 reached the highest level of 0.174 g-N L−1 d−1 in phase II, which was 1.4-fold higher than the control reactor (R4). To guarantee a stable supply of nitrite for anammox process, the nitrite accumulation efficiency (NAE) was always higher than 77%, even though the free ammonia (FA) decreases to 0.08 mg-N/L, and the pH decreases to 6.8 ± 0.3. In phase V, the AOR in R1 reached 0.206 g-N L−1 d−1 after the DO content increase from 0.7 ± 0.3 mg/L to 1.7 ± 0.3 mg/L. The NAE in R1 was consistently higher than 68.6%, which was much higher than the other reactor systems (R2: 43.8%, R3: 46.6%, R4: 23.7%, R5: 22.7%). Analysis of 16S rRNA gene sequencing revealed that the relative abundance of Nitrobacter and Nitrospira in R1 was significantly lower than other reactors, indicating that the sepiolite carrier plays an important role in the inhibition of nitrite-oxidizing bacteria. These results indicate that the sepiolite nonwoven composite carrier can effectively improve the nitritation process, which is highly beneficial for the application of partial nitritation–anammox for mainstream wastewater treatment.

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Enhanced microbial metabolism in one stage partial nitritation-anammox system treating low strength wastewater by novel composite carrier

Cited by 98 publications

References 52 publications

Advances and challenges of mainstream nitrogen removal from municipal wastewater with anammox‐based processes

Advances and challenges of mainstream nitrogen removal from municipal wastewater with anammox‐based processes

Responses of Anammox Granular Sludge to Long-Term Rare Earth Element Feeding: Lanthanum as a Case

Comparison of Different Carriers to Maintain a Stable Partial Nitrification Process for Low-Strength Wastewater Treatment

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