Effect of chromium(VI) on the biomass yield of activated sludge

Ülkü Yetiş; Göksel N. Demirer; Celal F. Gökçay

doi:10.1016/S0141-0229(99)00013-7

Effect of chromium(VI) on the biomass yield of activated sludge

Ülkü Yetiş, Göksel N. Demirer, Celal F. Gökçay

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

33 Scopus citations

Abstract

Effect of 1-25 mg/l of influent Cr(VI) concentrations on true biomass yield (Y(t)) and decay coefficient (k(d)) of activated sludge units was investigated in this study. To this purpose, completely mixed, once-through laboratory scale activated sludge units with acclimated cultures were operated. After obtaining dilute-out curves for each Cr(VI) concentration, the values of Y(t) and k(d) were determined. The results revealed that presence of Cr(VI) caused stimulatory effects on biomass yield and maintenance up to the Cr(VI) concentration of 25 mg/l. Lower Cr(VI) concentrations exerted higher stimulation of the system. Extended oxidation due to the presence of Cr(VI) and/or increased synthesis of cellular material due to the stimulatory effects of Cr(VI) were thought to be the mechanisms of the observed stimulation. Copyright (C) 1999 Elsevier Science Inc.

Original language	English
Pages (from-to)	48-54
Number of pages	7
Journal	Enzyme and Microbial Technology
Volume	25
Issue number	1-2
DOIs	https://doi.org/10.1016/S0141-0229(99)00013-7
State	Published - Jul 15 1999
Externally published	Yes

Keywords

Activated sludge
Biomass yield
Cr(VI)
Maintenance
Stimulation

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10.1016/S0141-0229(99)00013-7

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title = "Effect of chromium(VI) on the biomass yield of activated sludge",

abstract = "Effect of 1-25 mg/l of influent Cr(VI) concentrations on true biomass yield (Y(t)) and decay coefficient (k(d)) of activated sludge units was investigated in this study. To this purpose, completely mixed, once-through laboratory scale activated sludge units with acclimated cultures were operated. After obtaining dilute-out curves for each Cr(VI) concentration, the values of Y(t) and k(d) were determined. The results revealed that presence of Cr(VI) caused stimulatory effects on biomass yield and maintenance up to the Cr(VI) concentration of 25 mg/l. Lower Cr(VI) concentrations exerted higher stimulation of the system. Extended oxidation due to the presence of Cr(VI) and/or increased synthesis of cellular material due to the stimulatory effects of Cr(VI) were thought to be the mechanisms of the observed stimulation. Copyright (C) 1999 Elsevier Science Inc.",

keywords = "Activated sludge, Biomass yield, Cr(VI), Maintenance, Stimulation",

author = "{\"U}lk{\"u} Yeti{\c s} and Demirer, {G{\"o}ksel N.} and G{\"o}k{\c c}ay, {Celal F.}",

year = "1999",

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doi = "10.1016/S0141-0229(99)00013-7",

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TY - JOUR

T1 - Effect of chromium(VI) on the biomass yield of activated sludge

AU - Yetiş, Ülkü

AU - Demirer, Göksel N.

AU - Gökçay, Celal F.

PY - 1999/7/15

Y1 - 1999/7/15

N2 - Effect of 1-25 mg/l of influent Cr(VI) concentrations on true biomass yield (Y(t)) and decay coefficient (k(d)) of activated sludge units was investigated in this study. To this purpose, completely mixed, once-through laboratory scale activated sludge units with acclimated cultures were operated. After obtaining dilute-out curves for each Cr(VI) concentration, the values of Y(t) and k(d) were determined. The results revealed that presence of Cr(VI) caused stimulatory effects on biomass yield and maintenance up to the Cr(VI) concentration of 25 mg/l. Lower Cr(VI) concentrations exerted higher stimulation of the system. Extended oxidation due to the presence of Cr(VI) and/or increased synthesis of cellular material due to the stimulatory effects of Cr(VI) were thought to be the mechanisms of the observed stimulation. Copyright (C) 1999 Elsevier Science Inc.

AB - Effect of 1-25 mg/l of influent Cr(VI) concentrations on true biomass yield (Y(t)) and decay coefficient (k(d)) of activated sludge units was investigated in this study. To this purpose, completely mixed, once-through laboratory scale activated sludge units with acclimated cultures were operated. After obtaining dilute-out curves for each Cr(VI) concentration, the values of Y(t) and k(d) were determined. The results revealed that presence of Cr(VI) caused stimulatory effects on biomass yield and maintenance up to the Cr(VI) concentration of 25 mg/l. Lower Cr(VI) concentrations exerted higher stimulation of the system. Extended oxidation due to the presence of Cr(VI) and/or increased synthesis of cellular material due to the stimulatory effects of Cr(VI) were thought to be the mechanisms of the observed stimulation. Copyright (C) 1999 Elsevier Science Inc.

KW - Activated sludge

KW - Biomass yield

KW - Cr(VI)

KW - Maintenance

KW - Stimulation

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JO - Enzyme and Microbial Technology

JF - Enzyme and Microbial Technology

IS - 1-2

ER -

Effect of chromium(VI) on the biomass yield of activated sludge

Abstract

Keywords

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