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Due to its structure, hexamethylenetetramine (HMT) is a slowly biodegradable substance, hydrolysing in acid environment to ammonium and formaldehyde. Formaldehyde is toxic under normal conditions for biological treatment processes. Following an adaptation, a formaldehyde concentration of 1000 mg·l⁻¹ may become biodegradable both in aerobic and anaerobic conditions. Acidic conditions for hydrolysis...
Sugar beet pulp is a very suitable material for anaerobic biodegradation. This work investigates anaerobic treatment of sugar beet pulp in a pilot plant. The pilot plant consisted of an acidogenic reactor (volume 5.3 m(3)) and an methanogenic reactor (volume 3.5 m(3)). It was found that designed technology was convenient for both, high degradation of beet pulp dry matter and sufficient specific biogas...
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...
This paper reviews the present status of sewage, wasterwater treatment and water quality management in Slovakia. The impact of discharged wastewater on the quality of receiving waters is presented. Legislation in Slovakia is compared with European legislation concerning water quality effluent standards. Typical treatment methods used are described and the problems of wastewater monitoring discussed...
The results of anaerobic treatment of molasses processing wastewater in labscale AHR are presented. The performance of the model has shown that wastewater from molasses processing in BIOPO Leopoldov is suitable for anaerobic treatment. In the reactor, anaerobic granulated biomass was cultivated. As follows from granulation process observation, intensive wash-out of the suspended biomass started at...
Denitriiication using real wastewaters from chemical production was studied in lab-scale reactors. The wastewater streams contained as main compounds vinyl acetate, acetaldehyde and methanol. The highest denitrification rates were estimated in the wastewater with vinyl acetate. The effect of the tested substrates on endogenous metabolism and nitrification inhibition is discussed.
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...
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