Floatation separation apparatus

Patent metadata

Field	Value
Publication number	US-11512009-B2
Application number	US-201716334599-A
Country	US
Kind code	B2
Filing date	Sep 13, 2017
Priority date	Oct 5, 2016
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

A floatation separation apparatus includes a stirring tank, a stirring pump installed in the stirring tank, a floatation tank into which flocculated water flows from the stirring tank through an overflow dam, a scraping device (scraper) configured to scrape floating substances in the floatation tank, a treated water tank into which treated water in the floatation tank flows, and a pump and a hose for returning the treated water in the treated water tank to a raw water tank. The stirring pump sucks air and water inside the stirring tank, and discharges water mixed with air bubbles to a lower part of the stirring tank. The height of the overflow dam is adjustable.

First claim

The invention claimed is:

1. A floatation separation apparatus comprising:
a stirring tank into which raw water and a flocculant are introduced;
a pump provided in the stirring tank and configured to suck air and the raw water to which the flocculant is added through a suction port and discharge the air and the flocculant to a lower part inside the stirring tank;
a floatation tank into which flocculated water in the stirring tank flows over an overflow dam; and
a scraping device configured to scrape floating substances in the floatation tank,
wherein at least one of the overflow dam and the pump is movable upward and downward so that a distance between the suction port and a water surface in the stirring tank is adjustable.

2. The floatation separation apparatus according to claim 1 , wherein the pump is a stirring pump including an impeller.

3. The floatation separation apparatus according to claim 1 , wherein the overflow dam includes a flashboard extending upward at a tilt toward the stirring tank.

4. The floatation separation apparatus according to claim 1 , wherein the scraping device scrapes floating substances from an entire water surface of the floatation tank.

5. The floatation separation apparatus according to claim 1 , wherein an inside of the floatation tank is divided into a plurality of small floatation tanks by a first partition plate, and floating substances in each small floatation tank are scraped by the common scraping device.

6. The floatation separation apparatus according to claim 5 , wherein an inside of the stirring tank is divided into a plurality of small stirring tanks by a second partition plate, and each small stirring tank is disposed adjacent to the corresponding one of the small floatation tanks.

7. The floatation separation apparatus according to claim 1 , wherein the pump sucks air and water in the stirring tank, and discharges water mixed with air bubbles to a lower part of the stirring tank.

8. The floatation separation apparatus according to claim 7 , wherein the pump includes a discharge pipe with a lower end at a bottom part of the stirring tank so that swirl flow is generated in the stirring tank.

Assignees

• Kurita Water Ind Ltd

Inventors

• Oki Koichi

Classifications

• C02F1/24 Primary

  by flotation (C02F1/465 takes precedence) · CPC title

• Y02P70/10

  Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working · CPC title

• C02F1/40

  Devices for separating or removing fatty or oily substances or similar floating material (cleaning or keeping clear the surface of open water from oil or like materials E02B15/04; devices in sewers for separating liquid or solid substances from sewage E03F5/14, e.g. for use in drains leading to the sewer E03F5/16) · CPC title

• C02F1/52

  by flocculation or precipitation of suspended impurities {(C02F1/463 takes precedence)} · CPC title

• B03D1/028 Primary

  Control and monitoring of flotation processes; computer models therefor · CPC title