Anaerobic treatment of propylene glycol-contaminated domestic wastewater and microbial community profile at threshold ratio

Cigdem Yangin-Gomec*, Gizem Engiz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

An up-flow anaerobic sludge bed (UASB) reactor was operated for five months to treat domestic wastewater contaminated by propylene glycol -main component of Type 2 aircraft deicing fluid (ADF)- at threshold ratio based on optimization study with batch reactors [i.e., operated at externally included ADF = 0.83–4.20%]. Biogas yields up to ~0.4 m3/kg CODinfluent was achieved, however drastically reduced along with total chemical oxygen demand (tCOD) removal at ADF>1.20% and indicated strong inhibition. Hence, the UASB reactor was fed at ADF = 1.05% [tCODinfluent = 8930 ± 2100 mg/L] and yielded >80% tCOD removal on average. Next generation sequencing (NGS) findings also revealed that Firmicutes and Bacteroidetes had the highest ratios of relative abundances in biomass sample taken at the last operating day; hence co-existence of these phyla played significant role in glycol removal with Synergistetes and Thermotogae bacteria whereas Methanobacterium and Methanoculleus archaea increased remarkably. Aircraft deicing fluid; Biogas; Glycol; Predominant species; Toxicity; UASB reactor.

Original languageEnglish
Article numbere06296
JournalHeliyon
Volume7
Issue number2
DOIs
Publication statusPublished - Feb 2021

Bibliographical note

Publisher Copyright:
© 2021

Funding

This work was supported by Istanbul Teknik Üniversitesi (Scientific Research Projects: ITU-AYP-2017-09 and MYL-2018-41313 ).

FundersFunder number
Istanbul Teknik ÜniversitesiMYL-2018-41313, ITU-AYP-2017-09

    Keywords

    • Aircraft deicing fluid
    • Biogas
    • Glycol
    • Predominant species
    • Toxicity
    • UASB reactor

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