A new activated sludge model with membrane separation–implications for sewage and textile effluent

Derin Orhon; Ayse Begum Yucel; Guclu Insel; Seyda Duba; Tugba Olmez-Hanci; Bulent Solmaz; Seval Sözen

doi:10.3390/membranes11080589

A new activated sludge model with membrane separation–implications for sewage and textile effluent

Derin Orhon, Ayse Begum Yucel, Guclu Insel, Seyda Duba, Tugba Olmez-Hanci, Bulent Solmaz, Seval Sözen^*

^*Corresponding author for this work

Department of Environmental Engineering

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

A new model for the activated sludge process with membrane separation is presented, based on the effective filtration size. A new size threshold is imposed by the membrane module. The model structure requires a modified fractionation of the chemical oxygen demand and includes chemical oxygen demand fractions entrapped in the reactor or in the flocs as model components. This way, it offers an accurate mechanistic interpretation of microbial mechanisms taking place in membrane activated sludge systems. Denim processing wastewater was selected for model implementation, which emphasized the significance of entrapped fractions of soluble hydrolysable and soluble inert chemical oxygen demand responsible for better effluent quality, while underlining the shortcomings of existing activated sludge models prescribed for systems with conventional gravity settling. The model also introduced particle size distribution analysis as a new experimental instrument complementing respirometric assessments, for an accurate description of chemical oxygen demand fractions with different biodegradation characteristics in related model evaluations.

Original language	English
Article number	589
Journal	Membranes
Volume	11
Issue number	8
DOIs	https://doi.org/10.3390/membranes11080589
Publication status	Published - Aug 2021

Bibliographical note

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Funding

The membrane bioreactor (MBR) can be regarded as a groundbreaking milestone for the traditional activated sludge process; it was a major leap forward, which allowed the replacement of the space consuming problematic gravity settling with the membrane filtration of biomass. Aside from a high-quality effluent suitable for reuse, this innovation basically ended the restrictions of gravity settling on biomass concentration in the reactor, simply by uncoupling the floc morphology and the separation process resulting in a much smaller footprint. Supported by extensive research, the implementation of MBRs rapidly

Keywords

Captured COD fractions
Denim processing wastewater
MASM
Modified COD fractionation
New model for membrane activated sludge
Particle size distribution

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.3390/membranes11080589

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title = "A new activated sludge model with membrane separation–implications for sewage and textile effluent",

abstract = "A new model for the activated sludge process with membrane separation is presented, based on the effective filtration size. A new size threshold is imposed by the membrane module. The model structure requires a modified fractionation of the chemical oxygen demand and includes chemical oxygen demand fractions entrapped in the reactor or in the flocs as model components. This way, it offers an accurate mechanistic interpretation of microbial mechanisms taking place in membrane activated sludge systems. Denim processing wastewater was selected for model implementation, which emphasized the significance of entrapped fractions of soluble hydrolysable and soluble inert chemical oxygen demand responsible for better effluent quality, while underlining the shortcomings of existing activated sludge models prescribed for systems with conventional gravity settling. The model also introduced particle size distribution analysis as a new experimental instrument complementing respirometric assessments, for an accurate description of chemical oxygen demand fractions with different biodegradation characteristics in related model evaluations.",

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author = "Derin Orhon and Yucel, {Ayse Begum} and Guclu Insel and Seyda Duba and Tugba Olmez-Hanci and Bulent Solmaz and Seval S{\"o}zen",

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AU - Orhon, Derin

AU - Yucel, Ayse Begum

AU - Insel, Guclu

AU - Duba, Seyda

AU - Olmez-Hanci, Tugba

AU - Solmaz, Bulent

AU - Sözen, Seval

PY - 2021/8

Y1 - 2021/8

N2 - A new model for the activated sludge process with membrane separation is presented, based on the effective filtration size. A new size threshold is imposed by the membrane module. The model structure requires a modified fractionation of the chemical oxygen demand and includes chemical oxygen demand fractions entrapped in the reactor or in the flocs as model components. This way, it offers an accurate mechanistic interpretation of microbial mechanisms taking place in membrane activated sludge systems. Denim processing wastewater was selected for model implementation, which emphasized the significance of entrapped fractions of soluble hydrolysable and soluble inert chemical oxygen demand responsible for better effluent quality, while underlining the shortcomings of existing activated sludge models prescribed for systems with conventional gravity settling. The model also introduced particle size distribution analysis as a new experimental instrument complementing respirometric assessments, for an accurate description of chemical oxygen demand fractions with different biodegradation characteristics in related model evaluations.

AB - A new model for the activated sludge process with membrane separation is presented, based on the effective filtration size. A new size threshold is imposed by the membrane module. The model structure requires a modified fractionation of the chemical oxygen demand and includes chemical oxygen demand fractions entrapped in the reactor or in the flocs as model components. This way, it offers an accurate mechanistic interpretation of microbial mechanisms taking place in membrane activated sludge systems. Denim processing wastewater was selected for model implementation, which emphasized the significance of entrapped fractions of soluble hydrolysable and soluble inert chemical oxygen demand responsible for better effluent quality, while underlining the shortcomings of existing activated sludge models prescribed for systems with conventional gravity settling. The model also introduced particle size distribution analysis as a new experimental instrument complementing respirometric assessments, for an accurate description of chemical oxygen demand fractions with different biodegradation characteristics in related model evaluations.

KW - Captured COD fractions

KW - Denim processing wastewater

KW - MASM

KW - Modified COD fractionation

KW - New model for membrane activated sludge

KW - Particle size distribution

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A new activated sludge model with membrane separation–implications for sewage and textile effluent

Abstract

Bibliographical note

Funding

Keywords

UN SDGs

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