Critical appraisal of respirometric methods for metal inhibition on activated sludge

E. Ubay Cokgor; S. Ozdemir; O. Karahan; G. Insel; D. Orhon

doi:10.1016/j.jhazmat.2006.06.038

Critical appraisal of respirometric methods for metal inhibition on activated sludge

E. Ubay Cokgor^*, S. Ozdemir, O. Karahan, G. Insel, D. Orhon

^*Corresponding author for this work

Department of Environmental Engineering

Istanbul Technical University

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

47 Citations (Scopus)

Abstract

This paper evaluates the merit of oxygen uptake rate measurements for the assessment of metal inhibition on activated sludge. For this purpose, experiments are conducted to calculate EC₅₀ levels of nickel and hexavalent chromium using the ISO 8192 procedure, yielding results that are highly variable and difficult to correlate, depending on the type of substrate and the initial food to microorganism ratio. Similar experiments based on continuous respirometric measurements to give the entire oxygen uptake rate profile provide a much better insight on the impact of inhibition on different biochemical processes taking place in the reactor. The results indicate that percent reduction of the amount of dissolved oxygen utilized after an appropriate reaction time is a much better index for the assessment of the inhibitory effects.

Original language	English
Pages (from-to)	332-339
Number of pages	8
Journal	Journal of Hazardous Materials
Volume	139
Issue number	2
DOIs	https://doi.org/10.1016/j.jhazmat.2006.06.038
Publication status	Published - 10 Jan 2007

Funding

This study was supported by the Scientific and Technical Research Council of Turkey (TUBITAK) under Project no. CAYDAG 102Y071. This study was also conducted as part of the sponsored research activities of Environmental Biotechnology Centre of The Scientific and Technical Research Council of Turkey.

Funders	Funder number
TUBITAK	CAYDAG 102Y071
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu

Keywords

Activated sludge
Heavy metals
Inhibition
Oxygen uptake rate
Respirometry

UN SDGs

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

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10.1016/j.jhazmat.2006.06.038

Cite this

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abstract = "This paper evaluates the merit of oxygen uptake rate measurements for the assessment of metal inhibition on activated sludge. For this purpose, experiments are conducted to calculate EC50 levels of nickel and hexavalent chromium using the ISO 8192 procedure, yielding results that are highly variable and difficult to correlate, depending on the type of substrate and the initial food to microorganism ratio. Similar experiments based on continuous respirometric measurements to give the entire oxygen uptake rate profile provide a much better insight on the impact of inhibition on different biochemical processes taking place in the reactor. The results indicate that percent reduction of the amount of dissolved oxygen utilized after an appropriate reaction time is a much better index for the assessment of the inhibitory effects.",

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AU - Cokgor, E. Ubay

AU - Ozdemir, S.

AU - Karahan, O.

AU - Insel, G.

AU - Orhon, D.

PY - 2007/1/10

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N2 - This paper evaluates the merit of oxygen uptake rate measurements for the assessment of metal inhibition on activated sludge. For this purpose, experiments are conducted to calculate EC50 levels of nickel and hexavalent chromium using the ISO 8192 procedure, yielding results that are highly variable and difficult to correlate, depending on the type of substrate and the initial food to microorganism ratio. Similar experiments based on continuous respirometric measurements to give the entire oxygen uptake rate profile provide a much better insight on the impact of inhibition on different biochemical processes taking place in the reactor. The results indicate that percent reduction of the amount of dissolved oxygen utilized after an appropriate reaction time is a much better index for the assessment of the inhibitory effects.

AB - This paper evaluates the merit of oxygen uptake rate measurements for the assessment of metal inhibition on activated sludge. For this purpose, experiments are conducted to calculate EC50 levels of nickel and hexavalent chromium using the ISO 8192 procedure, yielding results that are highly variable and difficult to correlate, depending on the type of substrate and the initial food to microorganism ratio. Similar experiments based on continuous respirometric measurements to give the entire oxygen uptake rate profile provide a much better insight on the impact of inhibition on different biochemical processes taking place in the reactor. The results indicate that percent reduction of the amount of dissolved oxygen utilized after an appropriate reaction time is a much better index for the assessment of the inhibitory effects.

KW - Activated sludge

KW - Heavy metals

KW - Inhibition

KW - Oxygen uptake rate

KW - Respirometry

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Critical appraisal of respirometric methods for metal inhibition on activated sludge

Abstract

Funding

Keywords

UN SDGs

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