Co-metabolism of nonylphenol ethoxylate in sequencing batch reactor under aerobic conditions

Alpaslan Ekdal; Didem Okutman Tas; Gulsum Emel Zengin; Irmak Batı Onay; Tugba Olmez Hanci; Derin Orhon; Emine Cokgor

doi:10.1007/s10532-022-09974-1

Co-metabolism of nonylphenol ethoxylate in sequencing batch reactor under aerobic conditions

Alpaslan Ekdal, Didem Okutman Tas, Gulsum Emel Zengin, Irmak Batı Onay, Tugba Olmez Hanci, Derin Orhon, Emine Cokgor^*

^*Corresponding author for this work

Department of Environmental Engineering

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

4 Citations (Scopus)

Abstract

The study evaluated the co-metabolism of nonylphenol polyethoxylate (NPEO) within a main substrate stream subjected to biodegradation in an activated sludge system. Peptone mixture simulating sewage was selected as the synthetic substrate. As a novel approach, the NPEO concentration was magnified to match the COD level of the peptone mixture, so that co-metabolism could be evaluated by respirometry and modeling. A sequencing batch reactor (SBR) set-up at high sludge age to also allow nitrification was operated for this purpose. A long acclimation phase was necessary to start NPEO biodegradation, which was completed with 15% residual by-products. Modeling of respirometric data could identify COD fractions of NPEO with corresponding process kinetics for the first time, where the biodegradation of by-products could be interpreted numerically as a hydrolysis mechanism. Nonylphenol diethoxylate (NP2EO) was observed as the major by-product affecting the biodegradation of NPEO, because NPEO and NP2EO accounted for 60 to 70% of the total soluble COD in the solution during the course of biological reactions. The co-metabolism characteristics basically defined NPEO as a substrate, with no appreciable inhibitory action on the microbial culture both in terms of heterotrophic and autotrophic activities.

Original language	English
Pages (from-to)	181-194
Number of pages	14
Journal	Biodegradation
Volume	33
Issue number	2
DOIs	https://doi.org/10.1007/s10532-022-09974-1
Publication status	Published - Apr 2022

Bibliographical note

Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Nature B.V.

Funding

This study is part of a larger project, the public−private partnership project (PROCLINA), which is co‐funded by an unconditional research grant from Medical Research Data Management (MRDM), as well as by the Ministry of Economic Affairs by means of a PPP Allowance made available by Health~Holland, Top Sector Life Sciences & Health (LSH M17073). Health~Holland encourages innovative research by financially supporting public−private partnerships in the life sciences and health sector, with the aim of developing sustainable and innovative products and services. The consortium has made agreements about the intellectual property (IP) related to the knowledge and products that will be developed in the project. The funding sources had no role in the study design; in the collection, analysis and interpretation of data; in the writing of the report; or in the decision to submit the paper for publication. This work is funded by ITU Scientific Research Fund with project entitled ?Fate of nonylphenol and nonylphenol ethoxylates in the aerobic and anaerobic stabilization of municipal treatment sludge? Project No: 36634.

Funders	Funder number
Health~Holland, Top Sector Life Sciences & Health	LSH M17073
ITU Scientific Research Fund	36634
Medical Research Data Management
Ministry of Economic Affairs

Keywords

Biodegradation
Modelling
Nonylphenol polyethoxylate (NPEO)
Process kinetics
Respirometry

UN SDGs

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

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10.1007/s10532-022-09974-1

Cite this

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title = "Co-metabolism of nonylphenol ethoxylate in sequencing batch reactor under aerobic conditions",

abstract = "The study evaluated the co-metabolism of nonylphenol polyethoxylate (NPEO) within a main substrate stream subjected to biodegradation in an activated sludge system. Peptone mixture simulating sewage was selected as the synthetic substrate. As a novel approach, the NPEO concentration was magnified to match the COD level of the peptone mixture, so that co-metabolism could be evaluated by respirometry and modeling. A sequencing batch reactor (SBR) set-up at high sludge age to also allow nitrification was operated for this purpose. A long acclimation phase was necessary to start NPEO biodegradation, which was completed with 15% residual by-products. Modeling of respirometric data could identify COD fractions of NPEO with corresponding process kinetics for the first time, where the biodegradation of by-products could be interpreted numerically as a hydrolysis mechanism. Nonylphenol diethoxylate (NP2EO) was observed as the major by-product affecting the biodegradation of NPEO, because NPEO and NP2EO accounted for 60 to 70% of the total soluble COD in the solution during the course of biological reactions. The co-metabolism characteristics basically defined NPEO as a substrate, with no appreciable inhibitory action on the microbial culture both in terms of heterotrophic and autotrophic activities.",

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AU - Olmez Hanci, Tugba

AU - Orhon, Derin

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Co-metabolism of nonylphenol ethoxylate in sequencing batch reactor under aerobic conditions

Abstract

Bibliographical note

Funding

Keywords

UN SDGs

Access to Document

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