Claims
- 1. A process for clarifying raw water by dissolved air flotation comprising the steps of:
- treating a flow of the raw water in a first zone with a flocculating agent and a stream of microscopic air bubbles to produce a first flotation clarification and a degassing and calming of the water,
- directing treated water and from said first zone following said flotation clarification to a second zone where a second flotation clarification occurs,
- further sequentially clarifying the water from said second zone in a third zone underlying, and in fluid communication with, said second zone, said third zone clarifying including locking the water being clarified in an array of inclined, open-ended channels, rotating said array of inclined, open-ended channels,
- isolating said second and third zones from turbulence in said first zone, and
- removing a floating sludge of flocculated contaminates produced by said first, second and third zone clarifying.
- 2. The process of claim 1 wherein said rotating is in unison with said sludge removing.
- 3. The process of claim 1 further comprising removing clarified water from said third zone by gravity discharging through a layer of pressurized gas.
- 4. The process of claim 3 further comprising the step of regulating the water level during said clarifying process and collecting said clarified water in a compartment underlying said layer of pressurized gas.
- 5. The process of claim 4 wherein said regulating comprises
- monitoring the water level in said second zone and said compartment,
- controlling the outlet of said clarified water from said compartment in response to said monitoring of said second zone water level, and
- controlling the clarified water level in said compartment in response to said monitoring of said clarified water level in said compartment.
- 6. The process of claim 5 wherein said clarified water level controlling comprises continuously adding pressurized gas to said gas layer, and bleeding off gas from said pressurized layer in response to said clarified water level monitoring.
- 7. A process for clarifying raw water by dissolved air flotation comprising the steps of:
- treating a flow of the raw water in a first zone with a flocculating agent and a stream of microscopic air bubbles to produce a first flotation clarification and a degassing and calming of the water,
- directing treated water from said first zone following said flotation clarification to a second zone where a second flotation clarification occurs,
- further sequentially clarifying the water from said second zone in a third zone underlying, and in fluid communication with, said second zone, said third zone clarifying including locking the water being clarified in an array of inclined, open-ended channels,
- isolating said second and third zones from turbulence in said first zone,
- removing a floating sludge of flocculated contaminants produced by said first, second and third zone clarifying; and
- removing clarified water from said third zone by gravity discharging through a layer of pressurized gas.
- 8. The process of claim 7 further comprising the step of regulating the water level during the clarifying process and collecting the clarified water in a compartment underlying said layer of pressurized gas.
- 9. The process of claim 8 wherein said regulating comprises;
- monitoring the water level in said second zone and said compartment,
- controlling the outlet of said clarified water from said compartment in response to said monitoring of said second zone water level, and
- controlling the clarified water level in said compartment in response to said monitoring of said clarified water level in said compartment.
- 10. The process of claim 9 wherein said clarified water level controlling comprises continuously adding pressurized gas to said gas layer, and bleeding off gas from said pressurized layer in response to said clarified water level monitoring.
REFERENCE TO RELATED APPLICATIONS
This is a Divisional Application of Ser. No. 08/638,116, filed Apr. 26, 1996.
US Referenced Citations (23)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1340793 |
Sep 1987 |
SUX |
1565812 |
May 1990 |
SUX |
Divisions (1)
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Number |
Date |
Country |
Parent |
638116 |
Apr 1996 |
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