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*

*Bu çalışma için yazışmadan sorumlu yazar

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3 Atıf (Scopus)


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.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)181-194
Sayfa sayısı14
Basın numarası2
Yayın durumuYayınlandı - Nis 2022

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


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.

FinansörlerFinansör numarası
Health~Holland, Top Sector Life Sciences & HealthLSH M17073
ITU Scientific Research Fund36634
Medical Research Data Management
Ministry of Economic Affairs

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