Application of Rotating Biological Contactor for Treatment of Wastewaters from Fish Breeding

作者：Rodziewicz Joanna^*; Filipkowska Urszula; Janczukowicz Wojciech

来源：Rocznik Ochrona Srodowiska, 2011, 13: 1233-1243.

This manuscript describes a study conducted in the fractional-technical scale on a rotating electro-biological contactor operating under conditions of electric current flow with a density of: 4.75 mA/m(2). Stainless-steel disks with immobilized biomass served as a cathode, whereas an aluminum electrode mounted in the flow tank of the contactor - as an anode.
The study was aimed at determining the feasibility of applying electrolytically-aided denitrification in the treatment process of waters from intensive fish breeding.
The waters used in the experiment originated from the culture of barra-mundi fish conducted in a closed system. They were characterized by a high concentration of nitrogen compounds - 79.98 mgN/dm(3) and a relatively low concentration of organic compounds expressed as COD - 110.82 mg/dm(3), which made the application of the classical denitrification process impossible.
The technological design of the study assumed that nitrogen compounds would be subject to reduction during electric current flow. In turn, in the process of water electrolysis, gaseous hydrogen would be produced on the cathode's surface, that would be further utilized as a source of electron donor by autotrophic microorganisms in the denitrification process, owing to the formation of anoxic areas in the deeper layers of the biofilm due to restricted penetration of oxygen.
The study resulted in nearly 30% effectiveness of nitrogen compounds removal and over 40% effectiveness of organic compounds removal.

• 出版日期2011