Original scientific paper

The potential of dairy wastewater for denitrification

Tibela Landeka Dragičević ; Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, Zagreb
Marijana Zanoški Hren
Dijana Grgas
Igor Buzdum
Mirjana Čurlin

Abstract

In this work the potential of dairy wastewater for denitrification process by means of a microbial culture of nitrificants and denitrificants was investigated. The aim of this work was to remove nitrate by using organic compounds from the dairy wastewater as an electron donors. The minimal ratio of COD/NO3-N of 10 (COD-chemical oxygen demand/NO3-N-nitrate nitrogen) was required to achieve complete reduction of NO3-N. The microbial culture of nitrificants and denitrificants, that was previously adapted on the dairy wastewater, carried out nitrate reduction with a different substrate utilization rate. The denitrification rate of 5.75 mg NO3-N/Lh was achieved at the beginning of denitrification when the microbial culture utilizes readily biodegradable COD. Further degradation occurred with the denitrification rate of 1.7 mg NO3-N/Lh.

Keywords

dairy wastewater; denitrification; microbial culture of nitrificants and denitrificants

Hrčak ID:

59016

URI

https://hrcak.srce.hr/59016

Publication date:

29.9.2010.

Article data in other languages: croatian

Visits: 2.590 *