The role of interactions of effective biofilm surface area and mass transfer in nitrogen removal efficiency of an integrated fixed-film activated sludge system

Liu, Yiwen; Li, Chunyan; Lackner, Susanne; Wagner, Michael; Horn, Harald

doi:10.1016/j.cej.2018.06.053

Cited by 16 publications

(2 citation statements)

References 40 publications

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“…During the preliminary experimentation period, laboratory-scale conventional IFAS reactors were operated simultaneously with five frequently used carrier FRs (i.e., 20%, 30%, 40%, 50%, and 60%). ,, There were no differences in the concentration of effluent DON and DON bioavailability when the FRs increased from 40% to 60% (Figure S1 in the Supporting Information). Hence, three carrier FRs for the IFAS process (i.e., 20%, 30%, and 40%) were chosen in this study.…”

Section: Methodsmentioning

confidence: 99%

Effect of Carrier Filling Ratios on Dissolved Organic Nitrogen Removal in Integrated Fixed-Film Activated Sludge Systems Treating Municipal Wastewater

Zhu

Han

et al. 2021

ACS EST Eng.

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Previous research has focused on the removal characteristics of inorganic nitrogen in the integrated fixed-film activated sludge (IFAS) process. However, information on dissolved organic nitrogen (DON) is scarce, even though DON can be an important form of nitrogen in wastewater treatment plants with low-effluent total nitrogen. This study investigated the removal characteristics of DON in IFAS with three frequently used carrier filling ratios (FRs = 20%, 30%, and 40%). The results showed that effluent DON significantly decreased with an increase in the FR (p < 0.05, t-test). DON hydrophobicity-based fractionation combined with DON molecular composition analysis indicated that effluent DON from IFAS at FRs of 20% and 40% exhibits more lability than that at an FR of 30%, indicating that effluent DON at FRs of 20% and 40% is more prone to stimulate algae. This finding was also supported by an algal bioassay. As a result, there was no bioavailable DON (ABDON) removal increase when the FR of IFAS increased from 30% to 40% (p = 0.925, t-test). Gray relational analysis revealed that the metabolites dihydroceramide, 1-hexanol, and 3-sulfinoalanine had the greatest influence on DON bioavailability. Overall, this study indicates that operating an IFAS process with a higher FR cannot control the DON forms that readily stimulate algal growth.

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Section: Methodsmentioning

confidence: 99%

Effect of Carrier Filling Ratios on Dissolved Organic Nitrogen Removal in Integrated Fixed-Film Activated Sludge Systems Treating Municipal Wastewater

Zhu

Han

et al. 2021

ACS EST Eng.

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“…Additionally, this results in a distinct contribution from biofilm and suspended sludge to nitrogen removal, increasing the system's effectiveness at removing nitrogen (Liu et al, 2017 ; Shao et al, 2018 ). Liu et al ( 2018 ) found that the biofilm on the carrier media acts as a reserve capacity and when the substrate concentration exceeds the removal capacity of the suspended sludge, heterotrophic bacteria rapidly replace the autotrophic bacteria as the main active species in the biofilm, which contributes to the removal of decarbonization and ammonia.…”

Section: Factors Affecting the Denitrification Process Of Ifasmentioning

confidence: 99%

Research progress of anaerobic ammonium oxidation (Anammox) process based on integrated fixed‐film activated sludge (IFAS)

Li,

Yu,

et al. 2024

Environ Microbiol Rep

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The integrated fixed‐film activated sludge (IFAS) process is considered one of the cutting‐edge solutions to the traditional wastewater treatment challenges, allowing suspended sludge and attached biofilm to grow in the same system. In addition, the coupling of IFAS with anaerobic ammonium oxidation (Anammox) can further improve the efficiency of biological denitrification. This paper summarises the research progress of IFAS coupled with the anammox process, including partial nitrification anammox, simultaneous partial nitrification anammox and denitrification, and partial denitrification anammox technologies, and describes the factors that limit the development of related processes. The effects of dissolved oxygen, influent carbon source, sludge retention time, temperature, microbial community, and nitrite‐oxidising bacteria inhibition methods on the anammox of IFAS are presented. At the same time, this paper gives an outlook on future research focus and engineering practice direction of the process.

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Wastewater, 2. Aerobic Biological Treatment

Telgmann¹,

Horn

Schönberger

et al. 2019

Ullmann's Encyclopedia of Industrial Chemistry

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The role of interactions of effective biofilm surface area and mass transfer in nitrogen removal efficiency of an integrated fixed-film activated sludge system

Cited by 16 publications

References 40 publications

Effect of Carrier Filling Ratios on Dissolved Organic Nitrogen Removal in Integrated Fixed-Film Activated Sludge Systems Treating Municipal Wastewater

Effect of Carrier Filling Ratios on Dissolved Organic Nitrogen Removal in Integrated Fixed-Film Activated Sludge Systems Treating Municipal Wastewater

Research progress of anaerobic ammonium oxidation (Anammox) process based on integrated fixed‐film activated sludge (IFAS)

Wastewater, 2. Aerobic Biological Treatment

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