Toxicity And Biodegradation Potential Of Waste
Water From Industry Producing Fire Protection
Materials
Author(s)
T. Tišler, M. Cotman & J. Vrtovšek
Abstract
Effluents may contain hazardous chemicals, which could have adverse effects on
aquatic ecosystems. Important intrinsic properties are toxicity and
biodegradability of effluents and they should be assessed in order to protect the
aquatic environment. Microorganisms of activated sludge are responsible for
biological waste water treatment. The lack of treatment effectiveness could, in
case of unexpected toxic influents to waste water treatment plants, lead to a
discharge of toxic and undegradable effluents into receiving streams. The
assessment of potential adverse effects of influents entering the waste water
treatment plant is for this reason necessary. The aim of the study was to predict a
suitability of discharging the industrial waste water into waste water treatment
plants based on the assessment of waste water toxicity and biodegradability. The
waste water sample, originating from the industry producing fire protection
materials, was highly polluted with organic substances. At first, the acute
toxicity of the investigated sample was determined using activated sludge
measuring oxygen consumption rates. It was found that the waste water sample
was acutely toxic to microorganisms. Ready biodegradability of waste water was
determined in a closed respirometer by measuring oxygen consumption. As
diluted samples of the waste water were not readily biodegradable inherent
biodegradability of the waste water sample was evaluated using the Zahn-Wellens
test. It was found that diluted samples were inherently biodegradable
probably due to the fact that higher concentration of microorganisms of activated
sludge was added. It can be concluded that the tested waste water could be
discharged into the sewerage system on the condition that a dilution of the tested
waste water in the municipal waste water treatment plant would be at least 1:20.
Keywords: activated sludge, industrial waste water, inherent biodegradability,
oxygen consumption, ready biodegradability, toxicity, Zahn-Wellens test, waste
water treatment plant.
Keywords
activated sludge, industrial waste water, inherent biodegradability,
oxygen consumption, ready biodegradability, toxicity, Zahn-Wellens test, waste
water treatment plant.
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