Effluent water quality of fish laboratory at Norwegian University of Life Science (NMBU)
Master thesis
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http://hdl.handle.net/11250/2558881Utgivelsesdato
2018Metadata
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- Master's theses (RealTek) [1723]
Sammendrag
The fish laboratory at Norwegian University of Life Science (NMBU) is a modern
center for fish experiment with a recirculation aquaculture system. The main effluent
water is overflow from recirculation aquaculture system (RAS), the quality of
overflow is equal to system water. However, the main effluent water (overflow) is
required to be pump to the municipal water treatment plant. The objective of this
study is to understand the water quality of the main effluent water by measuring
concentration total nitrogen (TN), total phosphorus (TP), total suspended solid (TSS)
and chemical oxygen demand (COD). Samples was taken every 2 hours from 7:00 to
19:00 at January 18th and February 15th2018. The result showed that the average TN,
TP, TSS and COD concentration at January 18th was 5.59 mg/l, 0.21 mg/l, 0.61 mg/l
and 16.03 mg/l respectively. The TN, TP, TSS and COD concentration at February
15th was 5.2 mg/l, 0.152 mg/l, 0.472 mg/l and 5.83 mg/l. The concentration of these
parameters was lower compare with the outlet water of municipal waste treatment
plant (Søndre Follo) in Vestby. This suggests that the treatment in Søndre Follo does
not significantly increase the water quality of the main effluent water from fish
laboratory at NMBU. However, it will load the municipal plant with water that is
cleaner than the outlet. The amount of TP, TN TSS and COD produced by 1kg feed
supplied was 17.17 g, 0.56 g, 1.71 g and 33.2 g, respectively. In addition, the amount
of TP, TN, TSS and COD discharged with main effluent water was estimated at 23.9
kg, 0.79 kg, 2.37 kg and 46.1 kg per year. One possible solution is to set the effluent
water to lake in close area called Årungen. The amount of TP discharge to Årungen
with stream will be increased with 0.025%.