Читать книгу Fundamentals of Aquatic Veterinary Medicine - Группа авторов - Страница 26

Another type of water treatment that can be used is ozone. This effective oxidizer is produced in an onsite system and requires a high voltage generation unit. It is usually reserved for larger industrial aquasystems and public aquaria. A large source of purified oxygen is required to produce the ozone, which can be linked to a low head oxygenator or other oxygen feed systems that may already be in use to increase production capacity of a facility. Ozone oxidizes cell membranes, making it effective at killing bacteria, but fish and humans should not be directly exposed to it. As with UV, contact time in the water is important, with considerations for an initial killing dose followed by a residual dose to meet the required contact time. The residual dose can be reached inside a residual holding tank, allowing for longer contact time. The ozone must be transferred to the water by some method of injection system and inactivated before reaching the fish holding tanks, as fish are highly sensitive to residual ozone. When used in seawater systems, additional byproducts may need to be managed.