Application of Polyhydroxyalkanoates as Carbon Source for Nitrogen Compound Treatment in Recirculating Aquaculture System (RAS)

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Ruchiraphon Chandravadee
Kanokphorn Sangkharak
Jamjun Pechsiri


Nitrogen compounds in aquaculture systems resulted from excretion waste, feed and aquatic organism remains. The treatment of nitrogen compounds is commonly used biological process by fixing the microorganism on the surface of the material. Afterwards, the bacterial cell uptakes the nitrogen compound, which is changed to other substances to create energy for bacteria growth. Denitrification is one of the biological processes in nitrogen compound treatment. In this process, microorganisms use nitrate and organic carbon (carbon source) as electron acceptors and electron donors, respectively, in the respiration process. However, the disadvantage of low carbon addition may lead to nitrate accumulation. On the otherhand, the excess carbon addition increased the organic content in the system. Therefore, the addition of  carbon should be controlled by the specialist. Biodegradable polymers such as polyhydroxyalkanoate (PHA), are considered as an alternative to avoid the problem since there were advantages, which are, for example, biodegradation, using biofilter and being carbon sources, without any effects on quantity of nitrogen in water. In this research, we discussed the application of PHA as a carbon source to eliminate nitrogen compounds in recirculating aquaculture systems.


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