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Carbon dioxide toxicity problems are being encountered in aquaculture systems in which oxygen injection is used to increase fish production in recirculating systems. Fish excretion, low water exchange and lack of air-water contact for stripping are responsible for the accumulation of carbon dioxide in a recirculating aquaculture system. The equilibrium relationships and rate processes related to carbon dioxide removal are discussed in this paper. The mechanisms for air-stripping carbon dioxide are discussed and equations based on steadystate mass balances are developed. The importance of proper ventilation of carbon dioxide from aquaculture systems within buildings is demonstrated. In addition, chemical treatment for carbon dioxide neutralization is discussed.

Low-head, roughing filters for enhancing recycle water treatment for aquaculture