Documentation of water quality in a water recycling system for aquaculture (RAS)
Master thesis
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Date
2017-05-09Metadata
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- Master's theses (RealTek) [1707]
Abstract
A water quality analysis was conducted at a recirculating aquaculture system (RAS) with
Salmonbreed QTL PD smolt at Vik Settefisk AS, Bergen, Norway. The parameters oxygen (O2),
carbon dioxide (CO2), Salinity, potential of hydrogen (pH), temperature, mortality were measured over
2 stages; Stage 1 being day 1 to day 22, and Stage 2 being from day 1 to day 122. Other parameters
that measured and analysed during Stage 1 included Total ammonia nitrogen (TAN), Nitrite (NO2-N),
Nitrate (NO3-N), Ammonia (NH+4), Alkalinity and Chemical oxygen demand (COD). Recommended
thresholds found in published literature were compared to these results as well as the suppliers
recommended limits for their system. The system was Module 17 intensive RAS run by Vik Settefisk
AS in Øygården county, Bergen, Norway. According to the results, there w ere statistically
significant differences between Temperature, CO2, Salinity and pH at Stage 1 and Stage 2 measuring
data, however, the results remained within the published literature and the vendor guidelines for the
Module RAS. Additionally, a blockage between the moving bed biofilm reactor (MBBR) and
submerged fixed bed reactor (SBR) resulted in higher TAN, NO2-N, NO3-N in the SBR readings,
however still within the recommended limits.