Abstract
The aim of this work is to study the features of contaminated water formation in the recirculation aquaculture systems (RAS) plants for breeding of sharptooth catfish (Clarias gariepinus, Burchell 1820) and to develop the effective biotechnology for water quality recovering to allow water reuse. Disadvantages of classical water treatment technology from dissolved nitrogen compounds by using the nitrification with following denitrification lead to significant slowdown in the fish growth and increase the cost of products. On the basis of the analysis of pollutants concentrations in the catfish farm, which is working on the RAS-principle, the features of contaminated water formation and the reasons of low efficiency of facilities for mechanical and biological treatment were determined. The biotechnology that provides effective removal of dissolved nitrogen and phosphorus compounds by using phytoreactor with floating aquatic plants was proposed. Expediency of using molluscs in the processes of transformation of undissolved organic compounds in RAS water was proved. A comprehensive scheme of biological water treatment in RAS-plants for breeding of catfish was developed.
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