Thioguard® is Superior to Lime Slurry & Caustic Soda

ONE OF THE MOST COMMONLY ASKED QUESTIONS IS:
“IF I”M USING X GALLONS OF LIME SLURRY OR CAUSTIC SODA,
HOW MUCH THIOGUARD® DO I NEED?

SOUNDS LIKE A SIMPLE QUESTION, RIGHT?

On the surface, it’s easy to do the theoretical calculations and provide exact alkaline equivalents. However, field and trial experience tells us something different. The amount of high grade Thioguard® – magnesium hydroxide required to achieve equivalent buffering/performance benefits in the biological reactors tends to be much lower than the calculations would suggest. Why?

Often overlooked are some of the side impacts of lime use, such as softening and pH spikes, and confusion about what standard total alkalinity tests are telling us. An easy way to find out the extent of softening that is taking place in your facility, is to filter your sample with a 0.45 micron filter before titration. This will remove the insoluble CaCO3 particles that are not “biologically available.” Another significant, yet overlooked impact is the EPA documented sludge production typically associated with lime.

EPA – wastewater technology fact sheet – chemical precipitation: “the addition of treatment chemicals, especially lime, may increase volume of waste sludge up to 50%.”

LIME SOFTENING

Lime is commonly used in potable water to “soften,” or remove hardness minerals, such as calcium and magnesium from drinking water, in an effort to minimize the effects of potential scaling in the water distribution system. However, in the softening process, calcium and magnesium are removed from water in the form of calcium carbonate (CaCO3) and magnesium carbonate (MgCO3) which are also forms of alkalinity. Removing hardness from water also removes alkalinity.

In wastewater, lime is often considered as an alkalinity supplement. However, the effects of lime softening can have undesirable consequences to the biological system, e.g., removal of alkalinity, creation of CaCO3 sludge, and the potential for bio-upsetting pH spikes.

The simple fact: Thioguard® and lime slurry have different physical and chemical properties that affect how each responds to and reacts with the systems to which they are added. And because of these differences in properties, the impacts they impart and the utility for their use are starkly different.

 DID YOU KNOW…

  • Because of the high solubility of both caustic soda and lime, pH often becomes
    biologically prohibitive before ideal alkalinity levels and process stability can
    be reached.
  • The use of lime in, or prior to, primary treatment can actually reduce alkalinity going into the secondary treatment processes by precipitating CaCO3 in the primary clarifiers
  • Lime produces calcium carbonate in wastewater which acts as a coagulant for hardness and particulate matter.
  • Lime is an effective phosphate removal agent, but results in a large sludge volume and the addition of treatment chemicals, especially lime, may increase the volume of waste sludge up to 50 percent.

Hydrated Lime added in collection systems increases O&M costs
related to formation of scale and accumulated solids/sludge.
In severe cases this leads to line blockages and SSO’s

The use of lime generates significant amounts of sludge in wastewater collection systems and treatment plants. On a chemical basis, one ton of lime can generate as much as 5 tons of 20% sludge cake to remove or dispose. In contrast, Thioguard® reactions in wastewater produce only water and water-soluble products as TDS with NO added sludge. In fact, customers using Thioguard® have reported reductions of 15%-25% in total solids/sludge produced, due to a combination of improved biological performance, divalent cation bridging of floc matrix, and reduced inorganic solids loading.
WHEN COMPARED TO CAUSTIC SODA OR LIME SLURRY
THIOGUARD® IS SUPERIOR

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.

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 will likely fall short in supplying adequate alkalinity requirements without adversely elevating pH beyond biologically healthy limits. And often, maintaining pH stability and uniformity across entire treatment basins remains a virtual impossibility.

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 a higher percentage of cake solids.

DID YOU KNOW…

 

  • 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.

Reactor systems treated to an initial pH of 8.5 using Thioguard, caustic soda and lime.Equivalent amounts of acid added to each over time.

NOW THAT’S POWER!


Call 1.800.227.4287 or
Email thioguard2@premiermagnesia.com

Visit www.thioguard.com
to learn more about how

THIOGUARD® can help your plant!

 

Save 50% a Year in Pump Costs by Choosing THIOGUARD®

FORCE MAIN GAS BINDING

PROBLEM STATEMENT:

Pumping and conveying of wastewater from end user through the collection system to wastewater treatment plants can result in negative conditions including gas binding, blockages associated with fats, oils and greases (FOG), and system corrosion. There may be other contributing conditions, but these factors appear to be the greatest contributors to O&M costs including energy consumption, maintenance costs, and Sanitary Sewer Overflows (SSOs).

BACKGROUND:

A collection system line is a unique conveyance system. The transfer of wastewater can result in the release of gases such as O2 – Oxygen, CO2 – Carbon Dioxide, N2 – Nitrogen Gas, H2S – Hydrogen Sulfide, CH4 – Methane, VOCs – Volatile Organic Compounds, and VOSCs – Volatile Organic Sulfur Compounds among others. Some of these gases are drawn into the system through pumping and ventilation, while others are generated within the system either chemically or biologically. These gases can result in the development of gas binding in the system, especially with the utilization of calcium nitrate, as well as contribute to odors and corrosion.

FORCE MAIN GAS BINDING DRAMATICALLY INCREASED
WITH CALCIUM NITRATE (CaNO3) ADDITION

Save up to 50% per year in pump station power costs by choosing THIOGUARD®
as your odor, FOG and corrosion control process in your collection system.

Solution: THIOGUARD® can overcome these issues by reducing or eliminating gas emissions from wastewater, dissolving FOG blankets and reducing corrosion to pumps and infrastructure. No other product can match Thioguard’s ability to neutralize both collection system surface acid and wastewater acid over short and long distances to and through the wastewater treatment plant.

FORCE MAIN WITH THIOGUARD® TREATMENTFORCE MAIN WITH NO LIQUID PHASE TREATMENT
Call 1.800.227.4287 or
Email thioguard2@premiermagnesia.com

Visit www.thioguard.com to learn more about how
THIOGUARD® can help your plant!