Thioguard Applications at Wastewater Treatment Plants

Direct addition of THIOGUARD to a collection system provides the following benefits at the Treatment Plant:

- Optimal Resource Recovery — and the resulting
operational cost savings
- Nutrient Addition — Essential Element for Cell Metabolism
- Odor Control
- Corrosion Control
- Alkalinity Supplementation
- pH Control

THIOGUARD improves secondary wastewater treatment for BOD (Biological Oxygen Demand), TSS, Turbidity, ammonia and phosphorus, while enhancing sludge growth and settling characteristics, and improving biosolids treatment, dewatering and disposal.

Nitrogen compounds are the primary cause of pH/alkalinity degradation in treatment plants, with pH depletion being the major cause of activated sludge bulking, high SVI (Sludge Volume Index), and disinfection problems.

Digestion, Nitrification, Alkalinity and pH Control

Aerobic digestion and nitrification in the activated sludge process depletes natural alkalinity and can cause pH depression. A drop in pH can arrest second-stage nitrification and cause major upset conditions in the secondary clarifiers, resulting in effluent violations for BOD, TSS (Total Suspended Solids), ammonia, etc. Likewise, adequate alkalinity insures biological process stability and improves methane gas production of anaerobic digesters. THIOGUARD provides both alkalinity and pH stability for biological processes.

Secondary Clarifiers and SVI

Periodic pH problems interfere with the growth of floc-forming activated sludge. When this happens, sludge bulking and unwanted denitrification may cause SVI levels to increase. THIOGUARD provides both pH stability and divalent cations, which improve the Monovalent/Divalent (M/D) Cation Ratio.


These divalent cations and pH stability provided by THIOGUARD also improves dewatering/drying performance, polymer use and odor reduction, whether using drying beds, filters, or centrifuges.

Chlorine Disinfection

Incomplete nitrification allows nitrite (NO2-N) to pass through the clarifiers and into the chlorine contact tank, consuming chlorine at accelerated rates. Moreover, low pH and inadequate alkalinity can hinder rapid hydrolysis of Cl2 gas, reducing disinfection efficiency. THIOGUARD facilitates complete nitrification and provides pH stability for efficient chlorination.

pH Control

Technical grade magnesium hydroxide slurry has long been used to maintain pH during nitrification. Because alkalinity is released slowly, there are no hot spots to kill Nitrosomonas or Nitrobacter bacteria.

And since the by-products of technical grade magnesium hydroxide reactions are soluble salts, THIOGUARD does not increase the amount of sludge produce in the plant. In fact, studies have shown THIOGUARD may actually reduce sludge production by 10-20%.







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