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RE: Wastewater Tank

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One of the primary problems with wastewater is corrosion due to hydrogen
sulfide gas above the liquid surface. The extent of the problem depends on
where in the wastewater treatment process you are at, open vs closed tank,
amount of turbulence, etc. The following publication discusses this in great
detail: "Sulfide in Wastewater Collection and Treatment Systems" by ASCE
(Manuals and Reports on Engineering Practice - No. 69; published in 1989).
PVC liners (such as Ameron T-Lock) provide effective protection for severe
corrosion areas. Coatings may be used to delay corrosion but tend to fail
after a number of years in service. Odor control ventilation can reduce the
severity of corrosion but will not eliminate it. 

-----Original Message-----
From: Julian Maranan [mailto:Julian.Maranan(--nospam--at)]
Sent: Thursday, November 08, 2001 12:30 AM
To: seaint(--nospam--at)
Subject: Wastewater Tank

Dear fellow Engineers, 

I am designing a concrete wastewater treatment tank. The waste water has a
ph value of 6.50 and a constant temperature of 80 degrees celcius. Aside
from crack width requirement, are there any other special requirement that
needs to be satisfied to address the effects of wastewater (on the
structure) considering its ph value and temperature? If there are any, what
are those and what reference(s) should I use? 



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