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1

Cadmium uptake by activated sludge in a semicontinuous system

100%
Zarnovsky L., Derco J., Kuffa R., Drtil M.
Polish Journal of Environmental Studies
|
1993
|
tom 02
|
nr 3
The influence of solid retention time on cadmium uptake by activated sludge at different concentrations of the metal was studied. Activated sludge was cultivated in a lab-scale bioreactor with plug-flow pattern. Respirometric measurements were applied to evaluate the inhibitive effects of cadmium on activated sludge. The obtained values of the conditional adsorption constant indicate a similar affnity of cadmium to activated sludges cultivated in both plug-flow and complete-mixing reactors. The decrease of the metal affinity to activated sludge cultivated in a semicontinuous system with an increasing solid retention time was observed. High value of the mass ratio of cadmium in the activated sludge to metal in the surrounding liquid phase at equilibrium conditions made possible subsequent cadmium recovery. Maximum inhibition of cadmium to non-acclimated activated sludge was observed after 6 to 10 hours of exposure. The highest toxicity of this metal was observed between 2 and 5 hours after cadmium dosing of the acclimated sludge. A beneficial influence of solid retention time on the toxicity of the metal with regard to non-acclimated activated sludge resulted from this work.
2

Use of water treatment sludge at the holic wastewater treatment plant

100%
Bodik I., Drtil M., Zarnovsky L., Derco J.
Polish Journal of Environmental Studies
|
1998
|
tom 07
|
nr 1
Half a year experience in sludge dosing from a water treatment plant to the municipal wastewater treatment plant in Holič is presented. Sludge from the water treatment plant containing a high percentage of iron (15 t%) in different forms was used as a coagulant. The dosing of water treatment sludge at the WWTP strengthened the water treatment effect on insoluble substances, phosphorus removal, and caused a remarkable improvement of the sedimentation properties of the wastewater treatment sludge.
3

Influence of iron and aluminium salts on activated sludge process during simultaneous precipitation of phosphorus

100%
Derco J., Zarnovsky L., Kuffa R., Liptakova E.
Polish Journal of Environmental Studies
|
1996
|
tom 05
|
nr 6
The process of simultaneous precipitation of phosphorus from synthetic wastewater in aerobic biological systems with Fe(II) and Al(III) salts has been studied. Respirometric measurements have been applied to rvaluate the influence of heavy metals on activated sludge respiration activity. The factors which influence the evaluation of inhibition or stimulation effect of precipitants on biomass have been studied. The stimulation effect of Fe on heterotrophic biomass respiration activity was observed in typical metal concentrations range applied in the chemical process of phosphorous removal. The influence of precipitants on biokinetic parameter values has been investigated. Not only phosphorus elimination and the increase of activated sludge activity, but also the improvement of sludge settlement characteristics and improved efficiency of organic impurities removal resulted from the work.
4

Modelling of a carrousel plant by an intermittently aerated activated sludge process

88%
Derco J., Kralik M., Kovacs A., Beresikova Z., Zarnovsky L.
Polish Journal of Environmental Studies
|
1994
|
tom 03
|
nr 1
An intermittently aerated completely mixing lab-scale bioreactor was applied in the modelling of simultaneous nitrification and denitrification processes carried out in the Carrousel system. Two kinetic models based on the IAWPRC task group kinetic and stoichiometric concept were developed and verified. The model parameters number is reduced and the influence of waste water composition on oxygen transport rate is implicitly incorporated by the evaluation of oxic and anoxic "switching functions" based on oxygen profile data monitored in the bioreactor. The advantages of this approach in comparison to the tank-in-series model are discussed.
5

Anaerobic treatment of distillery wastewater

76%
Drtil M., Hutnan M., Lesansky M., Nemeth P., Bilanin M., Kratochvil K., Zarnovsky L.
Polish Journal of Environmental Studies
|
1994
|
tom 03
|
nr 4
Distillery wastewater treatment in a laboratory anaerobic UASB reactor is described. The aim of the modelling was to determine optimum reactor organic loading and the design reactor volume. The process was followed at 20°C reactor temperature, because the distillery wastewater was diluted with municipal wastewater to achieve the required nutrient balance (the UASB reactor will be situated at a municipal wastewater treatment plant). In addition, the effect of high suspended solids concentrations in distillery wastewater on UASB treatment efficiency is described. Separation of suspended solids in a pre-equalization tank followed by stabilization of settled solids in a digester of municipal sewage sludge was proposed to eliminate the accumulation of these solids in the UASB sludge bed.
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