THIOGUARD® TST
ODOR, CORROSION, FOG, BIOLOGICAL, AND BIOSOLIDS TREATMENT
Thioguard - Providing both pH and Alkalinity
A whole new twist on pH and Alkalinity
Most wastewater treatment plant operators understand that their wastewater treatment
plants function best at some ideal pH...and that a minimum amount of alkalinity is
required to keep microorganisms happy. But too often, the values of pH and
alkalinity are incorrectly used interchangeably, and a thorough understanding of each
parameter’s true relationship to biological stability and optimal performance gets
lost in the translation. |
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| Most often this error in terminology stems from
the use of the most common alkaline pH modifiers and alkalinity supplements, caustic soda
and lime, where their use may successfully meet pH demands, but fall way short in
supplying adequate alkalinity requirements without adversely elevating pH beyond
biologically healthy limits. And often times, maintaining pH stability and
uniformity across entire treatment basins remains a virtual impossibility. |
Commercial Sources of
Alkalinity (OH-)
Na, Ca, Mg and K
 |
Enter magnesium hydroxide, more commonly referred to as milk of magnesia,
and in the municipal arena is commonly found under the tradename, THIOGUARD TST.
Compared to caustic soda or lime, THIOGUARD is capable of supplying
significantly more alkalinity in a bio-available form to a microbial wastewater system
without adversely affecting pH. This creates a more suitable environment for
bioremediation of BOD and nutrients like nitrogen and phosphorus. Moreover, because
magnesium supplies a light-weight, divalent cation, unlike the monovalent sodium in
caustic, and heavier calcium in lime, THIOGUARD helps to generate a denser, more easily
dewatered sludge, with higher % cake solids.
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DID YOU KNOW?
- It only takes 0.4 mg/L (4 ppm) of caustic soda to raise a water sample to pH 9 and 4.0
mg/L to reach pH 10.
- 0.4 and 4.0 mg/L of Lime raises pH to 9.06 and 10.06 respectively.
- It takes 100+ mg/L of Thioguard to raise a water sample to pH 8.8.
- This same 100 mg/L of Thioguard has the same neutralizing power as 138 mg/L of caustic
soda and 135 mg/L of lime and would be the equivalent of, though significantly more
reactive than, adding 172 mg/L calcium carbonate alkalinity on a CaCO3 basis, assuming
100% bicarbonate conversion…NOW THAT’S POWER!
Thioguard TST is a nonhazardous application
with no required reportable quantities (RQ = None) |
