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Large EQ tanks at point-of-discharge
Posted: Tuesday, June 7, 2011 7:59 PM
Joined: 6/7/2011
Posts: 1

Is anyone aware of an existing large equalization tank at the point-of-discharge, say 100,000-200,000 gallons?

 We want to install one for a hotel that would discharge during non-peak hours into the municipal collection system.  We intend to discharge approx. 70,000 gal within a 3 hr period during the early morning hours.  Our client wishes to view an example of such an EQ tank to understand the potential risks involved with the operation.

Posted: Thursday, February 28, 2013 1:11 PM
Joined: 10/2/2009
Posts: 3

I am aware of a prison that has an onsite EQ basin with about 18 hours of hydraulic detention time.  There are several problems.  The first is odors, they exchange the media in the exhaust air scrubber so frequently the cost is now a barrier.  The corrosion inside the covered EQ basin (CROM) will soon destroy the tank.  The tank includes a internal prop type mixer and two mixing aspirators.  The aspirator air lines were extended through the roof to allow external air to be used as an attempt to improve odors.  The recieving POTW has odor problems.  The mixers are truned off in low flow times to prevent soap suds building up and causing "high water" alarms.  There is discussion of building a new lift station and bypassing the tank unless there is need for the storage.