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Dissolved Air Flotation System

a technology of dissolved air flotation and filtration system, which is applied in the direction of multi-stage water/sewage treatment, water/sludge/sewage treatment, chemistry apparatus and processes, etc., can solve the problems of water used to generate gas/air solution mix, variable bubble size, and limitations of daf systems at sites,

Inactive Publication Date: 2018-09-27
HYDRO TREATMENT TECH LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration stabilizes bubble size, enhances solids separation efficiency, and reduces operating costs by utilizing recycled water, achieving greater than 99% suspended solids removal and minimizing the need for flocculation chemicals.

Problems solved by technology

One problem with piping from a single source is that there can be a pressure drop or head loss in the transmission or piping lines which can cause variability in the bubbles size when the gas comes out of solution.
The water used to generate the gas / air solution mix can present a limitation to certain applications of the DAF.
This can present a limitation in using DAF systems at a site, for example at some remote oil drilling sites, in which fresh or sufficiently clarified water is scarce.
Alternatively or additionally, providing sufficiently clear water can increase operating cost of the DAF systems.

Method used

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Examples

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Effect test

Embodiment Construction

[0022]Shown in FIGS. 1A & 1B are schematic representations of a dissolved air flotation system (DAF) 10 to provide solids separation of an influent water contaminated with solids and / or oil. The preferred systems described herein are applicable to the oil and gas industry and in particular to tracking and drilling operations. Depending on the application and treatment (tracking water, drilling water, food processing effluent, agricultural waste, etc.) the influent from these operations are typically loaded with solids and oils and can have concentrations of solids ranging from 1000-6000 mg / I, free oil concentrations of between 0-1000 mg / I, and other chemical constituents that can be treated to precipitate out of solution and subsequently removed from the water with this type of treatment system. As a DAF system 10, each system includes a flotation cell using a dissolved gas, preferably air, for separating contaminants from the fluid. Accordingly, as shown in FIG. 1 A is one preferre...

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Abstract

A method of using dissolved air flotation in a flotation cell to filter water is provided. The method involves creating first and second air-water mixtures and discharging the first air-water mixture with a current in the flotation cell and the second air-water mixture countercurrent to the direction of flow in the flotation cell. The bubbles created when the air is released separate solids out of the water.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This patent application is a divisional application of, and claims priority from, pending U.S. application Ser. No. 14 / 171,725, filed Feb. 3, 2014, the entire specification of which is incorporated by reference herein.TECHNICAL FIELD[0002]The present invention relates to water filtration systems. More specifically, the present invention relates to dissolved air flotation (DAF) filtration systems and arrangements of their flotation cell or tank. Specific applications of the preferred system described herein include water filtration applications specific to the oil and gas industry.BACKGROUND[0003]Generally known DAF systems include a tank into which influent flows for the separation of solid contaminants. One or more discharge devices are distributed about the tank to discharge a dissolved air or gas and water mix into the influent. As the dissolved gas comes out of the gas / water mix or solution, bubbles are formed. Solids in the influent ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C02F9/00C02F1/52C02F1/24B03D1/14
CPCB03D1/1431C02F9/00C02F1/24C02F1/52B03D1/1456
Inventor RICE, DAVID B.
Owner HYDRO TREATMENT TECH LP