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Recycling Clarifier

IP.com Disclosure Number: IPCOM000085999D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

McGarigle, DM: AUTHOR [+2]

Abstract

This clarifier receives waste water in an inner turbine area where lime is added to control the pH and the waste water is mixed with a flocculent and agitated by the turbine.

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Recycling Clarifier

This clarifier receives waste water in an inner turbine area where lime is added to control the pH and the waste water is mixed with a flocculent and agitated by the turbine.

An outer area of the clarifier includes a bed of particles of solid waste suspended in the water, with the heavier particles nearest the bottom and the lighter particles tend toward the top. The top of the bed is 3 to 4 feet below the liquid surface of the outer area.

In normal operation, the mixture exits downward from the inner area around a skirt enclosing the turbine and then filters upward through the bed via a hydraulic flow, due to the new waste water being pumped into the clarifier.

The bed height is maintained through the controlled combination of turbine speed, flocculent additions and the hydraulic flow due to the new waste water being added. Once the bed is formed and process conditions are stabilized, the bed can be held and maintained for long periods of time.

When the clarifier is shutdown, such as over weekends and during holiday periods when no new waste water is received, the bed drops and it is difficult to rebuild it rapidly during restart. However, rather than shutdown and restart when no new waste water is received, a recycling of water in process is effected by monitoring the inflow and returning the clarifier effluent back into the feed source to maintain water inflow and hence the bed stability.

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