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


Ekdal A., Okutman Taş D., Zengin Balcı G. E., Onay I. B., Ölmez Hancı T., Orhon D., ...More

BIODEGRADATION, vol.33, no.2, pp.181-194, 2022 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 33 Issue: 2
  • Publication Date: 2022
  • Doi Number: 10.1007/s10532-022-09974-1
  • Journal Name: BIODEGRADATION
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Agricultural & Environmental Science Database, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Chimica, Compendex, EMBASE, Environment Index, Food Science & Technology Abstracts, Geobase, MEDLINE, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
  • Page Numbers: pp.181-194
  • Keywords: Biodegradation, Nonylphenol polyethoxylate (NPEO), Respirometry, Modelling, Process kinetics, ENDOCRINE-DISRUPTING CHEMICALS, WASTE-WATER TREATMENT, DIFFERENT SLUDGE AGES, BIODEGRADATION CHARACTERISTICS, ALKYLPHENOL ETHOXYLATES, AQUATIC ENVIRONMENT, DEGRADING BACTERIA, TREATMENT-PLANT, DEGRADATION, FATE
  • Istanbul Technical University Affiliated: Yes

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.