# US 7,744,755 B2 · Biological treatment and filtration system equipment

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- Number: US 7,744,755 B2
- Document ID: US7744755B2
- Status: Granted
- Kind: B2
- Application number: 12/213,108
- Filed: 2008-06-13
- Published: 2008-12-18
- Granted: 2010-06-29
- Earliest claimed: 2007-06-13
- Inventors: Toyofumi Miyazaki
- Web page: https://patentgrep.com/patent/US7744755B2

## CPC

- C02F 3/06: using submerged filters
- B01J 20/0222: {Compounds of Mn, Re}
- B01J 20/06: comprising oxides or hydroxides of metals not provided for in group B01J20/04
- C02F 1/004: {using large scale industrial sized filters}
- C02F 3/10: Packings; Fillings; Grids (packing elements in general B01J19/30, B01J19/32)
- C02F 1/281: {using inorganic sorbents}
- C02F 2101/103: {Arsenic compounds}
- Y02A 20/152: Water filtration
- Y02W 10/10: Biological treatment of water, waste water, or sewage
- Y10S 210/912: Heavy metal
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

The present invention provides a biological treatment and filtration system equipment that can reliably remove most of materials harmful to the human body and arsenic components not capable of being removed until now, which are contained in the raw water, by a series of purification operations. A biological treatment and filtration system equipment includes a filter sand layer 111 that treats raw water by microorganism to filter impurities; a raw-water supplying unit 112 that is provided on the upper side of the filter sand layer; an outlet 113 that is provided on the lower side of the filter sand layer and is used to take out filtered water; a filtering net 114 that is detachably held on the upper side of the filter sand layer in a vessel, and includes a net body 114A to which absorbent capable of absorbing arsenic components contained in raw water is adhered, and a frame 114B fixed to an outer periphery of the net body; and a tube (114E) that is provided at an outer portion of the frame and is inflated by pressure fluid so as to seal a gap between the frame and an inner surface of the vessel.

## Claims

### Claim 1

A biological treatment and filtration system equipment for raw water, which comprises 1) a water treating vessel provided with a raw water inlet and a treated water outlet; 2) a filter sand layer provided between the inlet and the outlet in the vessel for filtering and biologically treating the raw water using a sand layer containing at least minute sintered sand particles carrying microorganisms; 3) a filtering net provided on the top of said filter sand layer, comprising a net body carrying absorbent for absorbing arsenic components contained in the raw water and a frame fixed to the periphery of the net body, wherein a tube ring is engaged on the periphery of the frame of filtering net in a manner to bulge out by a pressure fluid supplied thereto until contacting to a inner surface of the vessel to make a sealing off between the frame and the inner surface, and wherein the raw water inlet is disposed above the filtering net and the treated water outlet is disposed below the filter sand layer.

### Claim 2 (depends on 1)

The biological treatment and filtration system equipment for raw water according to claim 1, wherein the net body is made of minute mesh net.

### Claim 3 (depends on 2)

The biological treatment and filtration system equipment for raw water according to claim 2, wherein the net body is made of stainless steel wire screen having a mesh in a range of 0.053 mm to 0.283 mm.

### Claim 4 (depends on 1)

The biological treatment and filtration system equipment for raw water according to claim 1, wherein the absorbent contains a manganese oxide able to absorb arsenic components and other harmful materials to the human body.

### Claim 5 (depends on 1)

The biological treatment and filtration system equipment for raw water according to claim 1, wherein said filtering net is suspended from a top periphery end of the vessel by means of an attachment bracket.

### Claim 6 (depends on 1)

The biological treatment and filtration system equipment for raw water according to claim 1, wherein said filter sand layer comprises a first layer comprising very minute sintered sands having an average diameter in a range of 0.08-0.3 mm, a second layer comprising sintered sand having an average diameter in a range of 0.4-1.8 mm, and a third layer comprising ballasts and cobble stone having an average diameter in a range of 2-20 mm.

### Claim 7 (depends on 1)

The biological treatment and filtration system equipment for raw water according to claim 1, further comprising a filter sand washer for spraying water, the filter sand washer comprising a holder and a washer nozzle fixed to said holder, the filter sand washer is further provided between the filter sand layer and the filtering net.

### Claim 8 (depends on 1)

The biological treatment and filtration system equipment for raw water according to claim 1, wherein an aeration device comprising a holder and an air nozzle fixed to the holder, the aeration device is further provided between the filter sand layer and the filtering net to discharge air to microorganisms carried in the filter sand layer.

### Claim 9 (depends on 8)

The biological treatment and filtration system equipment for raw water according to claim 8, further comprising a plurality of air nozzles arranged lengthwise and crosswise on the holder.