Effect of sludge retention time on the performance and sludge filtration characteristics of an aerobic membrane bioreactor treating textile wastewater

Tulay Yilmaz*, Emir Kasım Demir, Gulfem Asik, Senem Teksoy Başaran, Emine Ubay Çokgör, Seval Sözen, Erkan Sahinkaya

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

In this study, the impact of different sludge retention times (SRTs) on the wastewater treatment performance of an aerobic membrane bioreactor (MBR) was investigated using real textile industry wastewater. For this purpose, two laboratory-scale membrane bioreactors were operated in parallel. Under the same conditions, one of the systems was operated at an SRT of 30 d and, the other at SRTs of 20 d, and 10 d, respectively. The total chemical oxygen demand (COD), color and soluble total nitrogen (TN) of the wastewater averaged 927 ± 277 mg/L, 910 ± 287 Pt–Co and 39 ± 10 mg/L, respectively. COD removal efficiency remained above 90 % in all the tested SRTs. While the color removal efficiency was 55 % and 60 % at SRTs of 30 d and 20 d, respectively, it decreased to 50 % at SRT of 10 d. In addition, the impact of different SRTs on membrane filtration performance was studied. With the reduction of SRT to 10 d, an increase was observed in specific resistance to filtration (SRF) and supernatant filterability (SF) values, while viscosity decreased due to lower suspended solid (SS) concentration. According to gel permeation chromatography (GPC) analysis, the molecular weights of organic substances in the permeate distributed over a wide spectrum as SRT decreased. Also, signals given by the low molecular weight organic compounds were higher.

Original languageEnglish
Article number103390
JournalJournal of Water Process Engineering
Volume51
DOIs
Publication statusPublished - Feb 2023

Bibliographical note

Publisher Copyright:
© 2022 Elsevier Ltd

Funding

This research was supported by The Scientific and Technological Research Council of Turkey (TUBITAK/Project no: 119R031). Tülay YILMAZ thanks Council of Higher Education (CoHE 100/2000 Ph.D. Scholarship Program) and TUBITAK (2211/A National Ph.D. Scholarship Program) for their support. This research was supported by The Scientific and Technological Research Council of Turkey (TUBITAK/Project no: 119R031 ). Tülay YILMAZ thanks Council of Higher Education (CoHE 100/2000 Ph.D. Scholarship Program) and TUBITAK (2211/A National Ph.D. Scholarship Program) for their support.

FundersFunder number
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu119R031
Yükseköğretim Kurulu

    Keywords

    • Filtration characteristics
    • Membrane bioreactor
    • Sludge retention time
    • Textile wastewater
    • Water reuse

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