Coating System for Fish Hatchery Sludge Tanks

[dik]

I'm looking in to a coating system for Sludge Tanks for a hatchery.

The information I have is as follows:

pH is between 6 and 8

Very limited H2S and methane due to toxicity

Contents approximately:
3% nitrogen (N)
3% phosphorus (P)
0.10% potassium (K)
7% calcium (Ca), and
.6% magnesium (Mg)

Trace metals of arsenic (As), cadmium (Cd), cobalt (Co), chromium (Cr), iron (Fe), mercury (Hg), manganese (Mn), nickel (Ni), lead (Pb), selenium (Se), and zinc (Zn) and 2 g/Kg Iron (Fe)

The contents are continuously replaced as follows:

Total Suspended Solids: 4500 Kg/year
BOD Load: 16,000 Kg/year
TOC Load: 4,000 Kg/year

New construction, the concrete tanks are 30 MPa, with 25% flyash, w:c 0.4 max, and a 4" max slump.

The current coating systems I'm looking at are a high build, 2 part, 3M Scotchcoat or a similar polyurethane coating system.

Does anyone know of any problems with the proposed coating, or have a better one?

Dik

 

[Andrew1974]

I think something like a Cyclo-Aliphatic Epoxy would work good. I've used one in the past for chemical resistance and for immersion.

Here's the on I used. Gulf Coast Paint's PC-517

http://gulfcoastpaint.com/wp-content/uploads/2015/11/PC-517-Super-Mastic-Brochure.pdf

 

[dik]

Thanks very much

Dik