Wastewater Odor Control Chemical

Thioguard TST is a safe, alkaline slurry similar to milk of magnesia and it is used to control wastewater odor and prevent corrosion. Think of it as milk of magnesia but for your sanitary system. Learn more about our odor control and corrosion prevention technology below.

Thioguard TST can be applied in a variety of ways, including:

Direct Addition for Odor Control:
Added directly to sewers, THIOGUARD stops odors by preventing the formation of hydrogen sulfide gas and it is a safer, more environmentally friendly alternative compared to caustic soda.

Crown Spray for Corrosion Control:
Surfaces periodically sprayed with THIOGUARD are gently neutralized and protected from corrosion.

Major Advantages:

- Non-hazardous and safe to handle
- No danger to the public or the environment

- Low cost compared with all other options
- Can be added directly or crown sprayed

- Treats both odor and corrosion
- One feed rate treats all sulfide levels

Wastewater Odor Control Specifics

Odors occur when wastewater pH allows (H2S), also known as hydrogen sulfide, to evolve from liquid phasehydrosulfide (HS-). THIOGUARD is a wastewater treatment chemical, which prevents the formation and release of (H2S) gas in several important ways:

First, sulfate reducing bacteria operate best at pH levels 6.8 to 7.2. Above this ideal pH range, less sulfide is produced and SRB growth rate is stunted. THIOGUARD raises wastewater pH above 8.0 - so less sulfide is generated.

Second, (H2S) formation is extremely sensitive to pH. At pH levels < 7.0, the equilibrium reaction favors hydrogen sulfide ((H2S)) and odorous gas evolution. At pH > 7.0, the reaction favors hydrosulfide, (HS-).

Unlike other alkali choices, THIOGUARD contains slowly dissolving technical grade magnesium hydroxide particles. These particles have high surface pH and high surface area, applying additional physical adsorption and chemical bonding properties to make THIOGUARD more effective, even when wastewater pH returns to neutral, 7.0.

THIOGUARD may also reduce some odorous VOSCs (Volatile Organic Sulfur Compounds) like mercaptans (Thiols: R-HS) by adsorption and base reaction to form non-volatile ionic Thiolates: R-S.

THIOGUARD actually buffers water, gently raising pH without overshooting. Hydroxyl alkalinity is gradually released as needed, when acid or CO2 is produced within the system. This automatically controls pH in the correct range to prevent formation and release of (H2S). Overdosing simply adds alkalinity, as OH- and HCO3-.

Since THIOGUARD reactivity varies with wastewater chemistry, a titration is necessary to determine the optimum rate of addition. In general, it takes only 30-100 gallons of THIOGUARD per million gallons of sewage to raise and hold the pH in a range of 8.0 to 8.5. Once determined, the feed rate is seasonally constant, despite variances in sulfide concentration.




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