Mechanism of nutrient removal enhancement in low carbon/nitrogen wastewater by a novel high-frequency micro-aeration/anoxic (HMOA) mode

Chi, Yulei; Ren, Tong; Shi, Xuan; Jin, Xin; Jin, Pengkang

doi:10.1016/j.chemosphere.2020.128003

Cited by 15 publications

(5 citation statements)

References 47 publications

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“…Like the developing history of the CAS system that took decades to gradually upgrade from the common secondary treatment to the current era of BNR, the UN SDG campaign will also be a gradual but persistent process depending on the knowledge progress in N-removal mechanisms. Nevertheless, it should be noted that pushing anammox might not be the only available option, and creative aeration strategies can also achieve the same extent of N-removal (Chi et al 2021 ; Wang et al 2021 ). Therefore, from the engineering perspective, it will be wise to seek a middle ground between conventional CAS and cutting-edge technologies when it comes to WWTP retrofit.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the result of this study should not be interpreted in a fully quantitative way since no field verification has been carried yet. However, there are already successful reports to use conservative aeration strategies to promote N-removal in traditional BNR processes (Chi et al 2021 ; How et al 2020 ; Wang et al 2021 ). High-frequency micro-aeration/anoxic has been used to improve the treatment efficiency over low-C/N wastewater by directing the limited influent organic carbon to nitrogen and phosphorus removals in an AO system (Chi et al 2021 ).…”

Section: Resultsmentioning

confidence: 99%

“…However, there are already successful reports to use conservative aeration strategies to promote N-removal in traditional BNR processes (Chi et al 2021 ; How et al 2020 ; Wang et al 2021 ). High-frequency micro-aeration/anoxic has been used to improve the treatment efficiency over low-C/N wastewater by directing the limited influent organic carbon to nitrogen and phosphorus removals in an AO system (Chi et al 2021 ). Tuning down DO to promote simultaneous nitrification and denitrification has also been proven effective in enhancing nitrogen removals for both AAO and AO systems (Wang et al 2021 ; How et al 2020 ).…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Enhancing biological nitrogen removal for a retrofit project using wastewater with a low C/N ratio—a model-based study

Shao

Wang

Du³

et al. 2021

Environ Sci Pollut Res

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Anaerobic ammonium oxidation (anammox) has the merit of saving the carbon source and aeration energy for nitrogen (N) removal, but it is normally a challenge to achieve mainstream anammox. In this study, the potential to enhance the N-removal capability of an existing University of Cape Town membrane bioreactor system (UCT-MBR) system is evaluated through process modeling. In addition to external carbon addition, the UCT-MBR system is proposed to be converted into an anoxicoxic (AO) configuration with two operation plans: one is single-sludge (suspended sludge) and the other is double-sludge (suspended sludge and biofilm). The choice between pushing anammox and enhancing conventional heterotrophic denitrification is assessed. The simulation result indicates it is feasible to strategically adjust the spatial-temporal balance between electron donors and electron acceptors to achieve enhanced N-removal by utilizing the influent organic carbon other than adding external carbon. Although anammox can be promoted in the double-sludge-based AO under low-DO conditions, pushing anammox will weaken the system's resilience to influent fluctuations and carries no economic advantage over the single-sludge-based AO. Overall, this study concurs with the United Nations Sustainable Development Goal that the wastewater industry should seek more energy-efficient measures for wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Enhancing biological nitrogen removal for a retrofit project using wastewater with a low C/N ratio—a model-based study

Shao

Wang

Du³

et al. 2021

Environ Sci Pollut Res

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“…The original image data files obtained by Illumina HiSeq TM were converted into raw sequencing reads for analysis by CASAVA Base Calling [ 77 ]. Clean reads were obtained by filtering the original data and checking the sequencing error rate and GC content distribution.…”

Section: Methodsmentioning

confidence: 99%

Transcriptome Analysis Revealed a Positive Role of Ethephon on Chlorophyll Metabolism of Zoysia japonica under Cold Stress

Zhang

Wen

et al. 2022

Plants

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Zoysia japonica is a warm-season turfgrass with a good tolerance and minimal maintenance requirements. However, its use in Northern China is limited due to massive chlorophyll loss in early fall, which is the main factor affecting its distribution and utilization. Although ethephon treatment at specific concentrations has reportedly improved stress tolerance and extended the green period in turfgrass, the potential mechanisms underlying this effect are not clear. In this study, we evaluated and analyzed chlorophyll changes in the physiology and transcriptome of Z. japonica plants in response to cold stress (4 °C) with and without ethephon pretreatment. Based on the transcriptome and chlorophyll content analysis, ethephon pretreatment increased the leaf chlorophyll content under cold stress by affecting two processes: the stimulation of chlorophyll synthesis by upregulating ZjMgCH2 and ZjMgCH3 expression; and the suppression of chlorophyll degradation by downregulating ZjPAO, ZjRCCR, and ZjSGR expression. Furthermore, ethephon pretreatment increased the ratio of chlorophyll a to chlorophyll b in the leaves under cold stress, most likely by suppressing the conversion of chlorophyll a to chlorophyll b due to decreased chlorophyll b synthesis via downregulation of ZjCAO. Additionally, the inhibition of chlorophyll b synthesis may result in energy redistribution between photosystem II and photosystem I.

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“…The primary treatment, which mainly targets suspended solids removal, only has a significant effect on NH 4 + -N adsorbed onto the surface of some granular organic nitrogen and particulate matter. Conventional advanced treatment methods, such as coagulation and ozonation, have limited effectiveness in removing dissolved inorganic nitrogen and are associated with high economic costs, making them less suitable for application in municipal sewage treatment systems [2]. In the research field of wastewater treatment, biological nutrient removal (BNR) has long been recognized as the most effective and economical treatment, thus becoming a crucial area of focus [3].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Nitrogen Removal Enhancement in Low Carbon/Nitrogen Municipal Sewage by AAO Process with Activated Sludge-Biofilm Composite System

Rong,

Zhang,

Sun

et al. 2024

Pol. J. Environ. Stud.

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To address the issue of insufficient carbon sources in urban sewage, which leads to poor nitrogen removal performance in sewage treatment systems, an anaerobic/anoxic/aerobic (AAO) pilotscale reactor was established. The reactor aimed to treat low C/N (chemical oxygen demand; COD/ total nitrogen; TN) municipal wastewater (C/N<5). To enhance nitrogen removal and investigate the mechanism in the AAO process, a Pall ring modified biological suspended filler was introduced to the aerobic zone after achieving partial nitrification and denitrification (PND). The results revealed that the activated sludge-biofilm composite system can be successfully formed within 40 days, with a stable loaded biomass on the membrane at 40.06 mg/g (measured by volatile suspended solids (VSS)/filler). The aerobic zone of the activated sludge-biofilm composite system demonstrated an increase in nitrite accumulation rate (NAR) and simultaneous nitrification and denitrification efficiency (SND), from 60.46% and 19.42% in the initial stage (stage 1) to 69.62% and 46.47% in the stable forming stage (stage 3), respectively. By promoting both PND and SND pathways for nitrogen removal, the effluent from the system exhibited decreased concentrations of ammonia nitrogen (NH 4 + -N) at 0.11 mg/L and total nitrogen (TN) at 4.55 mg/L, indicating the significant synergistic effect of the biofilm on nitrogen removal. 16S rRNA amplification and sequencing analysis revealed that Proteobacteria was the dominant microorganism in the 60-day biofilm, accounting for 76.12% of the relative abundance. The main ammonia oxidizing bacteria (AOB) were Nitrosomanas (1.77%) and Nitrosococcus (1.69%). Meanwhile, denitrification microbial species were found to have a substantial proportion (29.11%), along with a small amount of Anammox bacteria (Anammoxoglobus,

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Mechanism of nutrient removal enhancement in low carbon/nitrogen wastewater by a novel high-frequency micro-aeration/anoxic (HMOA) mode

Cited by 15 publications

References 47 publications

Enhancing biological nitrogen removal for a retrofit project using wastewater with a low C/N ratio—a model-based study

Enhancing biological nitrogen removal for a retrofit project using wastewater with a low C/N ratio—a model-based study

Transcriptome Analysis Revealed a Positive Role of Ethephon on Chlorophyll Metabolism of Zoysia japonica under Cold Stress

Mechanism of Nitrogen Removal Enhancement in Low Carbon/Nitrogen Municipal Sewage by AAO Process with Activated Sludge-Biofilm Composite System

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