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RE: HDPE Liners for Concrete Tanks

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Acie,

In a waste water treatment environment, what is the source of the sulphuric acid? Normally concrete tanks below the liquid level are just plain concrete. I would be inclined to use a dense concrete mix design, and maybe a sprayed on protective coating. Whatever sulphuric acid exposure there may be should be very dilute below the liquid level.

I have had occassion to use T-Lock in many applications and in very heavy sulfate soils to protect concrete foundations from the sulfates. But I have never used them as a liner for waste water.

I would suggest that you call Ralph Eberts and explain what is going on. He may have some better advice.

Regards,
Harold Sprague




From: "Acie Chance" <achance(--nospam--at)lacsd.org>
Reply-To: <seaint(--nospam--at)seaint.org>
To: <seaint(--nospam--at)seaint.org>
Subject: RE: HDPE Liners for Concrete Tanks
Date: Wed, 29 Sep 2004 10:03:28 -0700

Harold

T Lock said there product was inappropriate when the bottom of the tank
will contain a  liquid.  There representative said there product will not
form a liquid barrier only a gas barrier, go figure.

Acie

-----Original Message-----
From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com]
Sent: Wednesday, September 29, 2004 9:15 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: HDPE Liners for Concrete Tanks


Acie,

Obviously the issue is the hydrogen sulfide that migrates up and forms
sulfuric acid above the liquid line. We generally specify T Lock to protect
the concrete surfaces.  T Lock is what was used for protection at the
Hyperion Intermediate Pumping Station.  Check out
http://www.leewens.com/plastic_liners.htm.

LA County did some studies a while back on several types of protection. The
trials were done on manholes.

If you need further information, contact Ralph Eberts at the LA Black &
Veatch office 213-312-3310.

Regards,
Harold Sprague




>From: "Acie Chance" <achance(--nospam--at)lacsd.org>
>Reply-To: <seaint(--nospam--at)seaint.org>
>To: <seaint(--nospam--at)seaint.org>
>Subject: HDPE Liners for Concrete Tanks
>Date: Wed, 29 Sep 2004 08:28:40 -0700
>
>
>      We have several large concrete tanks, 22'-0" square by 28'-0" high.
>These tanks will be used as Biotrickling Filters to remove Sulfur from the >air over our primary sedimentation tanks. The byproduct of this operation >is Sulfuric Acid which is hard on concrete tanks. In the past we have used
>PVC products as liners.  The supplier of the PVC Liner has changed his
>product and we are having difficulty getting it installing on our current
>project.  We are looking at using HDPE for a liner because of the ease of
>extrusion welding the liner pieces together using profile sections and the >ability to spark test the welds. We require the embedded lugs on the back >of the liner to be extruded with the sheets when they are manufactured. We >have only been able to find one supplier for this type of material. While >there product looks good on paper we would like to have all the information
>we can.  Has anyone else used a HDPE Liner with extruded lugs to protect
>concrete?
>
>Thanks
>Acie P. Chance  SE
>Los Angeles County Sanitation Districts.

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