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Caustic replacement

A safe and cost effective alternative to the use of sodium hydroxide (caustic soda) for wastewater alkalinity and pH adjustment.

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  • Feel you are paying too much for your alkali?
  • Looking at a safer alternative to caustic soda for pH control in your nitrification process?
  • Want a greener alkaline additive for your wastewater treatment?

Magnesium hydroxide VERSUS Sodium hydroxide

Mg(OH)2   vs   NaOH

Better for your budget

While Mg(OH)2 is typically more expensive on a “price per unit” basis, it is significantly less expensive in use. Every 1.0 kg of 50% NaOH can be replaced by 0.6 kg of 60% Mg(OH)2 to provide the same number of moles of hydroxide (OH-) for pH neutralization.

Check the comparison table

Better for your system

Magnesium hydroxide (unlike sodium hydroxide)
has coagulation properties. This means:

  • more solids content of sludge on dewatering device
  • less sludge volume
  • less sludge hauling fees
Check the comparison table

More alkalinity than caustic soda

When an alkaline compound dissolves in water it produces hydroxide ions, OH- . These ions are responsible for the alkalinity of the solution.

Because Magnesium Hydroxide Mg(OH)2 provides two hydroxides for alkalinity compared to one with NaOH caustic soda, the usage rate for Mg(OH)2 is much less than that required for NaOH.

Lower cost-per-litre ≠ cheaper

While ACTI-Mag is typically more expensive then 50% NaOH on a “price per unit” basis, it is significantly less expensive in use – because every 1.0 kg of 50% NaOH can be replaced by 0.6 kgs of 60% Mg(OH)2 to provide the same number of moles of hydroxide (OH-) for pH neutralization.

Improved solids settling

The wastewater stream for many industrial processes can be quite unpredictable and inconsistent. Dramatic changes in pH can have adverse effects on the settleability of suspended solids. To stabilise the pH, the wastewater is commonly neutralised with alkalis. The nature of the alkali selected can have a dramatic impact on the ability to settle suspended solids.

Caustic soda typically provides no settling benefit and often results in gelatinous sludge that does not dewater easily. With lime (Ca(OH)2) there is typically a significant increase in sludge volume due to the formation of calcium minerals, like calcium carbonate (CaCO3).

ACTI-Mag as a safer, greener and more cost effective alternative to caustic soda

ACTI-Mag has a higher neutralising value per kilo when compared with caustic whilst being significantly safer to handle than other traditional alkalis, making it a very safe and cost competitive option.

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Magnesium hydroxide VERSUS Sodium hydroxide

Mg(OH)2   vs   NaOH

Better for people

Nonhazardous for employees to handle, spill is not reportable.

Check the comparison table

Better for the environment

Magnesium is a macronutrient, core element of chlorophyll (makes everything green) – while sodium is a salinity hazard.

Check the comparison table

Safer and greener means further savings

Unlike caustic soda, ACTI-Mag is non-hazardous and non-corrosive, which makes it easier and safer to handle. Spill is not reportable.

Because magnesium is a macronutrient – it is the core element of chlorophyll (makes everything green!) – it is also beneficial to the environment while sodium is a salinity hazard.

Magnesium also has coagulation properties that sodium does not. This can result in reduced sludge volume and reduced sludge hauling fees.

CAUSTIC (SODIUM HYDROXIDE) IS STRONGLY IRRITATING AND CORROSIVE. IT CAN CAUSE SEVERE BURNS AND PERMANENT DAMAGE TO SKIN TISSUE ⇒

Watch and learn

Magnesium Hydroxide – safe and cost effective alternative to the sodium hydroxide / caustic soda

In this simple benchtop experiment, we will demonstrate that magnesium hydroxide provides more CaCO3 equivalent alkalinity on an equal weight basis when compared to caustic soda, which means less chemical consumption and can result in significant cost savings. Magnesium hydroxide is also non-hazardous and non-corrosive which makes handling safer and easier.

Magnesium hydroxide is also non-hazardous and non-corrosive which makes handling safer and easier.

ACTI-Mag Savings Calculator
  • Feel you are paying too much for your alkali?
  • Looking at a safer alternative to caustic soda for pH control in your nitrification process?
  • Want a greener alkaline additive for your wastewater treatment?

To see how much you could save by switching to ACTI-Mag, use our Savings Calculator.

Use our savings calculator

Got a wastewater challenge?

Our values guide us through every step of the work process, every collaboration we undertake and every challenge we approach:

Inclusion • Positive impact • Continuous improvement 

Customer Stories

Improving the Sustainability of Water Treatment \ Food & Beverage
An innovative mixed-metal hydroxide for pH control and wastewater microorganism activity

An innovative mixed-metal hydroxide for pH control and wastewater microorganism activity at a meat processing facility in the United-States.

Improving the Sustainability of Water Treatment \ Municipalities
Magnesium Hydroxide liquid dosing for odour control, Cassowary Coast Regional Council

Replace lime and alum with Calix’s ACTI-Mag magnesium hydroxide liquid at Cassowary Coast Region, QLD, Australia.

Improving the Sustainability of Water Treatment \ Municipalities
Solving extreme H2S odor, El Centro

ACTI-Mag reduces the odor to manageable levels at El Centro, Southern California, United-States.

Manufactured in Australia

Fully integrated supply chain – from mine to customer

Calix is able to offer better service, reliability and performance to its
customers because it controls the entire production process from mining
of raw materials, processing and production.

Got a question? Want a quote?

EMAIL US AND WE’LL BE HAPPY TO HELP!

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