Fish Hatchery Management - fisheries & aquaculture

HATCHERY REqUIREMENTS3lground; winter storage at northern hatcheries may be a problem, however.If transportation is available, or on-site mechanical separators and vacuumfilters can be justified, the sludge can be reduced to moist cakes and soldto commercial fertilizer manufacturers; some municipal sewage plantsdispose of sludge this way.Alternatively,if the hatchery is near an urban area, it may be possible todispose of solid waste in the municipal system. Incineration of sludge is theleast desirable means of disposal, as dewatering and drying the material iscostly, and the process merely exchanges air pollution for water pollution.Ftcunp 14. Sludge is collected from the linear clarifiers into storage lagoons atthe Jones Hole National Fish Hatchery, Utah. The lagoons are periodicallydewatered and the sludse dried for removal.