What is mechanical filter?
It removes solid wastes such as uneaten feed, fish waste and debris from the water.
What is biological filter?
It breaks down toxic ammonia and nitrite into less harmful nitrate through beneficial bacteria.
Name and operation.
Drum filter. Waste water is led into the drum and passes through the screen, leaving solids trapped against the screen.
3 locations to install filter in a farm.
Inlet, outlet, recirculating system.
3 unit process of a recirculating system
Mechanical filter, biological filter, aeration/oxygenator
2 benefits of square tank.
Increase capacity, round tank waste space,
3 types of tank material.
Glass-reinforced plastic, Plastic (polyethylene), Fibreglass, Concrete, Steel
3 requirement for biological filter.
large specific surface areas, difficult to clog, proper contact between the water and the surface of the medium, easy to clean
Name and operation.
Removal of particles when water is forced to flow through a layer of a sand of various sizes and depths.
Name 2 types of bacteria involved in nitrification process.
Nitrosomonas, Nitrobacter
Method to overcome pH drop in RAS filtration system.
Crushed oyster shell, dolomite [CaMg(CO3)2 ], coral, sodium bicarbonate (NaHCO3), sodium carbonate
What is pump?
Pump is a mechanical device that add energy to fluids by transforming mechanical energy to kinetic energy of the fluid.
What is centrifugal pump?
Pump that uses centrifugal force to develop velocity in the liquid being handled.
3 major unit of centrifugal pump.
Power unit (electric motor), pump shaft, impeller
How does the pump operates?
New water is drawn into the eye of the impeller via the pump inlet. Vanes pass kinetic energy to the water. Water rotates and leaves the impeller. Volute casing
2 maintenance for pump.
periodic lubrication, adjustment of end clearance and examination of internal parts.
