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US 5,350,505 AGranted
Plastic media filter
AssigneeJet, Inc.
InventorNianfa Tang
Life of this patent
Estimating the term…
Abstract
A filter for removal of biochemical oxygen demand and suspended solids utilizing multi-layer filtration media. The filter media includes plastic particles, sand, and garnet and is operated under an automatic control condition. Fine filtering is accomplished by a sludge cake which develops at the upstream face of the filter media. For cleaning the filtration media, deposited sludge is removed from the filter bed by backwashing in a short time period at a high strength backwash flow rate.
Claims38
A filtration system for the removal of suspended solids and biochemical oxygen demand from a fluid, comprising:
- (a) a first container means having a hollow inside area;
- (b) an influent line having an interface with the first container means and providing a passage for fluid to the inside area of the first container means from outside the first container means;
- (c) a first effluent line having an inner end, an outer end, a hollow inside surface, and an outside surface and further having an interface with the first container means at the inner end of the first effluent line, the first effluent line providing a passage for fluid from the inside area of the first container means to outside the first container means, the first effluent line further comprising a fluid passage means for allowing the passing of fluid between the hollow inside surface of the first effluent line and the outside surface of the first effluent line;
- (d) filtration media, located inside the first container means, for the removal of suspended solids from fluid in the first container means;
- (e) a top screen located in the inside area of the first container means between the influent line and the filtration media
- (f) filtration media support means for supporting the filtration media, located inside the first container means between the filtration media and the first effluent line;
- (g) a second effluent line having an interface with the first container means and providing a passage for fluid from the inside area of the first container means to outside the first container means, the top screen being located between the second effluent line and the filtration media;
- and
- (h) a backwash pump for sending fluid into the first container means through the first effluent line at a controlled speed when operated, the backwash pump being connected to the first effluent line at the outer end of the first effluent line, said first effluent line including an anti-syphon hole for keeping said filtration media submerged under liquid.
6 more elements
A filtration system for the removal of suspended solids and biochemical oxygen demand from a fluid, comprising:
- (a) a first container means having a hollow inside area;
- (b) an influent line having an interface with the first container means and providing a passage for fluid to the inside area of the first container means from outside the first container means and further having a check valve for preventing the flow of fluid through the influent line from the inside area of the first container means to outside the first container means;
- (c) a first effluent line having an inner end, an outer end, a hollow inside surface, and an outside surface and further having an interface with the first container means at the inner end of the first effluent line, the first effluent line providing a passage for fluid from the inside area of the first container means to outside the first container means;
- (d) filtration media, located inside the first container means, for the removal of suspended solids from fluid in the first container means;
- (e) a top screen located in the inside area of the first container means between the influent line and the filtration media;
- and
- (f) filtration media support means for supporting the filtration media, located inside the first container means between the filtration media and the first effluent line, said first effluent line including an anti-syphon hole for keeping said filtration media submerged under liquid, the filtration media comprising:
- (i) anti-electrostatic plastic granules having a specific gravity;
- (ii) sand particles having a specific gravity;
- and
- (iii) garnet particles having a specific gravity;
- (iv) all the plastic granules being larger in dimension than any of the sand particles, the specific gravity of the sand particles being greater than the specific gravity of the plastic granules, and the garnet particles having a specific gravity that is greater than the specific gravity of the sand particles;
- and
- (v) wherein the plastic granules are of a uniform size.
11 more elements
Dependencies are inferred from the claim text.