Whole effluent risk estimation for a small recipient watercourse

Refaey, Maha and Kováts, Nóra and Kárpáti, Á. and Thury, P. (2009) Whole effluent risk estimation for a small recipient watercourse. Acta Biologica Hungarica, 60 (3). pp. 293-299. ISSN 0236-5383

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Abstract

Whole effluent toxicity is most often considered as a static parameter. However, toxicity might change as degradation processes, especially biodegradation goes by and intermediate products appear. These intermediates can even be more toxic than the original effluent was, posing higher risk to the ecosystem of the recipient water body. In our test series it was assessed how toxicity of a municipal wastewater sample changes during biodegradation taking into consideration different temperature regimes (10, 20 and 30 °C). Results proved our null hypothesis: after the high initial toxicity of the fresh effluent sample toxicity did show a further increase. Biodegradation resulted in toxicity reduction only after an approx. 2 week-period.

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