# US 2021/0276900 A1 · Water treatment method

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2021/0276900 A1
- Document ID: US20210276900A1
- Status: Published application
- Kind: A1
- Application number: 17/256,530
- Filed: 2019-06-28
- Published: 2021-09-09
- Earliest claimed: 2018-06-29
- Assignees: Kuraray Co., Ltd.
- Applicants: Kuraray Co., Ltd.
- Inventors: Yusuke HIRAI; Yoshiyuki HAYASHI; Takuya OSAWA; Yu UKAI; Mototsugu YOSHIHARA
- Web page: https://patentgrep.com/patent/US20210276900A1

## CPC

- C02F 3/108: {Immobilising gels, polymers or the like}
- C02F 3/085: {Fluidized beds}
- C02F 3/104: {Granular carriers}
- C08J 3/075: Macromolecular gels
- C02F 2101/16: Nitrogen compounds, e.g. ammonia
- C02F 2101/30: Organic compounds
- C02F 2103/007: {Contaminated open waterways, rivers, lakes or ponds}
- C02F 2103/06: Contaminated groundwater or leachate
- C02F 2209/44: Time
- C08J 2329/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- Y02W 10/10: Biological treatment of water, waste water, or sewage
- 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)
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

A method for treating water including: passing water to be treated containing organic matters and ammonia nitrogen through a reaction tank containing a carrier for treatment under aerobic conditions, wherein a water content of the carrier is 50% or more and 96% or less; the carrier has continuous pores with a pore size of 30 μm or less; an organic matter concentration in the water to be treated is 100 mg/L or less as a BOD5, and an ammonia nitrogen concentration is 50 mg/L or less; a retention time of the water to be treated in the reaction tank is 2 hours or less; and the organic matters and the ammonia nitrogen in the water to be treated are treated in the same tank.

## Claims

### Claim 1

A method for treating water, the method comprising;
passing water to be treated containing organic matters and ammonia nitrogen through a reaction tank containing a carrier for treatment under aerobic conditions, wherein
a water content of the carrier is 50% or more and 96% or less;
the carrier has continuous pores with a pore size of 30 μm or less;
an organic matter concentration in the water to be treated is 100 mg/L or less as a BOD5, and an ammonia nitrogen concentration is 50 mg/L or less;
a retention time of the water to be treated in the reaction tank is 2 hours or less; and
the organic matters and the ammonia nitrogen in the water to be treated are treated in the same reaction tank.

### Claim 2 (depends on 1)

The method for treating water according to claim claim 1, wherein a concentration of organic suspended solids in the water to be treated is 100 mg/L or less.

### Claim 3 (depends on 1)

The method for treating water according to claim 1, wherein activated sludge is not used at the start-up of the reaction tank.

### Claim 4 (depends on 1)

The method for treating water according to claim 1, wherein water treatment equipment in which the method for treating water is performed does not include an activated sludge tank.

### Claim 5 (depends on 1)

The method for treating water according to claim 1, wherein at start-up of the reaction tank, the water to be treated is contacted with the carrier which is not pre-treated to carry bacteria so that the carrier carries bacteria capable of treating organic matters and ammonia nitrogen.

### Claim 6 (depends on 1)

The method for treating water according to claim 1, wherein the carrier is a gel carrier made of a polyvinyl alcohol.