Effect of chromium (CrVI) on the growth rate of activated sludge bacteria

Mazierski, Jerzy

doi:10.1016/0043-1354(94)00315-x

Cited by 32 publications

(24 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Information in the literature indicates that most bacteria are sensitive to Cr (VI) (Baldi et al 1990;Bopp and Ehrlich 1988;Luli et al 1983;Mazierski 1995). Only 0.1% of the microorganisms in water samples from a sewage treatment plant receiving domestic and tannary wastes (100 mg/L Cr (VI)) and sediment near an industrial facility were capable of growth in medium containing 50 and 100 mg/L Cr (VI) respectively (Baldi et al 1990;Luli et al 1983).…”

Section: Resultsmentioning

confidence: 99%

Influence of Chromium (VI) and Acidic Conditions on Removal of Pentachlorophenol from Soil by Arthrobacter Strain ATCC 33790

Edgehill

1996

Bulletin of Environmental Contamination and Toxicology

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Influence of Chromium (VI) and Acidic Conditions on Removal of Pentachlorophenol from Soil by Arthrobacter Strain ATCC 33790

Edgehill

1996

Bulletin of Environmental Contamination and Toxicology

View full text Add to dashboard Cite

“…Originating mainly in industrial sewage, they affect the performance of biological wastewater treatment processes, reducing or inhibiting the activity of microorganisms. Numerous papers have been published which deal with the occurrence of heavy metals in the various sections of sewage treatment systems (Yetis & Gokcay 1989;Cimino & Caristi 1990;Dilek & Yetis 1992;Melcer et al 1992;Mazierski 1995). The effect of metal pollutants on activated-sludge microorganisms varies with the concentration and exposure time.…”

Section: Effect Of Toxicants On Protozoa In Sewage Treatment Processesmentioning

confidence: 99%

Protozoa in wastewater treatment processes: A minireview

Madoni

2011

Italian Journal of Zoology

178

114

View full text Add to dashboard Cite

Biological wastewater treatment is a process of increasing importance in a world with an ever-increasing human population. Wastewater treatment facilities are designed to maintain the high density and activity levels of those microorganisms that carry out the various purification processes. Protozoa are one of the most common components in these man-made ecosystems and play an important role in wastewater purification processes. Protozoa are responsible for improving the quality of the effluent, maintaining the density of dispersed bacterial populations by predation. Studies of the relationships between protozoa and physicochemical and operational parameters have revealed that the species structure of these communities is an indicator of plant efficiency. The Sludge Biotic Index (SBI), an index based on the structure and abundance of the microfauna inhabiting the activated sludge and mixed liquor, has been devised to monitor activated-sludge plant performance. Heavy metals and other pollutants are toxic to most microorganisms at certain concentrations. These toxicants are common pollutants of sewage, particularly where there is industrial waste input. The protozoa community is a complex assemblage of interacting organisms, often including species that are sensitive, resistant or intermediate in their tolerance to pollutants. Many studies conducted on contaminated activated sludge and mixed liquor have revealed changes in the dynamics of the protozoa community. Tests on the acute toxicity of pollutants on ciliates have revealed that these microorganisms are useful bioindicators for evaluating the toxicity of waters polluted by different concentrations of metals.

show abstract

“…The water get worse by the accidents and even not up to the discharge index of the sewage plant [1][2][3][4]. Because overload of heavy metal ion will impact on the sludge system, and the toxicity of the ion will seriously inhibit the bacteria and other microorganisms.…”

Section: Introductionmentioning

confidence: 99%

Study on the inhibiting factors of the activated sludge activity of hexavalent chromium based on the change of dissolved oxygen

Zhao¹,

Zhao²,

Xu³

et al. 2017

2nd Annual International Conference on Energy, Environmental &Amp; Sustainable Ecosystem Development (EESED 2016)

View full text Add to dashboard Cite

Based on the effect of variation of dissolved oxygen on the oxygen uptake rate (our), To study the effect of Cr 6+ on the performance of activated sludge under different factors (concentration, MLSS, HRT, temperature, pH) by using activated sludge own activity. It has certain reference significance for the early warning and treatment of heavy metal in sewage plant. The results indicated that: (1) when the concentration of Cr 6+ is less than 15mg/L, the inhibition rate increases gradually. When the concentration of Cr 6+ is more than 15mg/L, the inhibition rate changes significantly. (2) Low concentration of MLSS is sensitive to heavy metal, high concentration of heavy metals can resist certain impact load. (3)The metabolism of the microbe which in the activated sludge would decrease the activity when the residence time extends. (4) The inhibitory effect of hexavalent chromium on activated sludge decreased with the increase of pH, and the tolerance ability of activated sludge to hexavalent chromium is stronger under the alkaline condition.(5) In the higher temperature, the activated sludge has strong impact tolerance to the same concentration of heavy metals.

show abstract

Effect of chromium (CrVI) on the growth rate of activated sludge bacteria

Cited by 32 publications

References 7 publications

Influence of Chromium (VI) and Acidic Conditions on Removal of Pentachlorophenol from Soil by Arthrobacter Strain ATCC 33790

Influence of Chromium (VI) and Acidic Conditions on Removal of Pentachlorophenol from Soil by Arthrobacter Strain ATCC 33790

Protozoa in wastewater treatment processes: A minireview

Study on the inhibiting factors of the activated sludge activity of hexavalent chromium based on the change of dissolved oxygen

Contact Info

Product

Resources

About