Nitrogen and chemical oxygen demand burden of waste water caused by trout raising influenced by the protein content of the feed] |
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| Authors: | C Schuster H Stelz O Schmitz-Schlang |
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| Institution: | Institut für Anatomie, Physiologie und Hygiene der Haustiere, Universit?t Bonn. |
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| Abstract: | A possibility was shown, how to quantify the water content of nitrogen and COD (Chemical Oxygen Demand) from intensive fish production, independent of flow rate and feeding time. The nitrogen excretion could be reduced 50% by feeding a protein reduced fish feed (A: 38.4% XP) compared with an fish feed B contending 47.9% protein (XP). The excretion-compartments were evaluated with the waste water parameter COD. Doing this, it could be shown that the COD input by feed A is reduced 20% in opposite to feed B. Further more the separation of fish faeces would achieve an COD reduction from about 50% to 70%. |
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