Animal husbandry – Aquatic animal culturing – Fish culturing
Patent
1995-01-23
1997-06-10
Manahan, Todd E.
Animal husbandry
Aquatic animal culturing
Fish culturing
119232, A01K 6304
Patent
active
056365950
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a device for removal of sediment particles from the water in a basin or tank for cultivating aquatic organisms.
Previously known cultivating plants have a small degree of separation of sediment particles from the water outlet. Presently, a lot of work is being done on a number of different solutions for screening or filtering particles from the outlet water. This is expensive due to the great volume of outlet water.
Most existing cultivating plants are incorrectly dimensioned if self-purification of the tank and outlet system is to be achieved. Purification of tanks and transport of particles in the outlet system is dependent on manual brushing and abrupt draining of the tanks. This means that the plants for separation of particles are being subjected to maximal hydraulic load at the same time, and consequently the plants should be dimensioned for this shock treatment.
In this kind of cultivation tank, the body of water rotates through the vertical axis of symmetry in the center of the tank. The flow conditions are established by use of the inlet and outlet arrangement for water supply and draining of the tank.
The water supply is located in the tank wall and the inlet comprises at least one underwater jet having a flow direction adapted to the desired flow pattern in the tank.
The outlet from the tank is located centrally in the bottom of the basin on the vertical axis of symmetry of the tank. The outlet arrangement may be different geometrical shapes; plane drainage with outlet in the top and/or distributed along the tower. The outlet arrangement should be dimensioned so that there will be established a combination of a forced and free vortex (Rankine's combined vortex). The outlet vortex represents a substantial contribution to the flow pattern that is desired in the tank and simultanously is an important factor in the flow patterns internally in the particle trap according to present invention.
The flow conditions that are established in the tank can be separated in a primary and secondary system the primary flow rotates the body of water about the vertical axis of symmetry and is established using the inlet and outlet arrangement. The secondary flow has an angular direction 90.degree. relatively to the primary flow, and is approximately 1/5-1/10 of the primary flow. The secondary flow comes into existence due to friction in the boundaries between the body of water and the bottom and the walls of the tank. The secondary flows are directed down the wall and in to the center of the tank, adjacent to the bottom of the tank.
Today, the food spill represents a substantial part of the particles in the outlet water. This is also a source of pollution in the outlet water.
Removal of sediment particles from the water can be separated into four distinct steps: transported along spiral paths made up by the secondary flows along the bottom and the primary flow of the tank, which spiral paths correspond to the vertical axis of symmetry for the primary flow. particle-enriched partition outlet from the tank, while the particle-free water is expelled in a main outlet. the sediment particles are removed from the water body. The sediment particles sink to the bottom of the particle trap and the outlet vortex takes care of the neccesary transportation of the particles on the bottom to the particle outlet which is constructed as a slot in the bottom the slot being transverse to the direction of movement of the particles. particle-enriched flow through a tube or hose to a separation unit which is installed outside the tank. The separation unit can be constructed as a vortex chamber. In the separation unit the particles are collected, and concentrated to a mud having a solid content of about 8%, before it is optionally transported for further treatment by some kind of mudstabilizing before deposition, or use as e.g. growth medium for production of plants.
The present invention concerns a device that takes care of step 3) in the separation process.
Previously, efforts to solve problems related
REFERENCES:
patent: 4655169 (1987-04-01), Pullola
patent: 5293839 (1994-03-01), Jorgensen
Lunde Trygve
Schei Idar
Skybakmoen Steinar
Manahan Todd #E.
Pittenger James E.
LandOfFree
Particle trap does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Particle trap, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Particle trap will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-758219