Aquaculture engineering - design of gas transfer systems part 1: site and water supply considerations

摘要

In the intensive culture of aquatic plants and animals, important water quality parameters include dissolved gases such as oxygen, carbon dioxide, hydrogen sulfide, ammonia, and nitrogen. Operation of a gas transfer system designed to modify the concentration of a single gas, such as oxygen, may significantly change the concentration of other gases in solution. Consideration of gases such as nitrogen and argon may significantly affect the design of pure oxygen systems or may require gas stripping prior to the use of these systems. Hydrogen, methane, and radon may be found in significant concentrations in some groundwaters. The build-up of carbon dioxide in rearing units and its removal also becomes an important problem in pure oxygen systems. Thus,design of a gas transfer system must consider potential impacts of all these dissolved gases and, in some cases, water quality parameters such as reduced iron and manganese, hardness, and pH.