Antiscalants and Dispersants for Water Treatment

The presence of scale and deposits on cooling water exchangers and boiler tubes reduces heat transfer and increases energy consumption. When scale or deposits occur on reverse osmosis membranes, they hinder membrane permeation which increases energy consumption and reduces production. Struvite in wastewater treatment plants restricts water flow and results in the need for periodic cleanings.

Brennsperse Dispersants and Antiscalants are used in cooling treatment, boiler water treatment, reverse osmosis, and wastewater treatment to prevent scale formation by one or a combination of the following methods:

• “Threshold Effect” scale inhibition: the ability of very small amounts of scale inhibitors to
  keep large quantities of scalants in solution
• Crystal Modification: Dispersants disrupt, alter, or weaken the formation of a crystal structure.
• Sequestration: the ability to inactivate a metal ion and keep it in solution,
  preventing its negative side-effects
• Dispersion: prevents the agglomeration of scale particles
• Corrosion Control: provides synergistic corrosion control when used with zinc,
  phosphates, nitrates, molybdates, and others

The need to prevent dirt, deposits, and scale from forming or redepositing during washing is essential.

Brennsperse Dispersants and Antiscalants help remove and transport dirt, deposits, and scale during the cleaning cycle, keeping them dispersed in the wash water and not redeposited.

These polymeric additives are effective in the detergents and cleaners market with multiple functions similar to their use in water treatment.

Benefits for the detergents & cleaners market include:

• Anti-redeposition: Dispersants keep removed soils entrapped in the wash water, preventing
  the soil from redepositing back onto the clothing and preventing residues (spots) from
  forming on hard surfaces.
• Sequestrates: Dispersants prevent precipitation of inorganic salts such as carbonates,
  phosphates, and silicates on the fabric or surface.
• Spray Drying Additives: Dispersants improve the process of spray dry detergents by
  reducing slurry viscosity, improving slurry (crutcher) homogeneity, and increasing solids of the
  crutcher mix, reducing dusty fines, and increasing bead strength

When mining, the extraction of calcium, phosphate, kaolin, and sand often requires the minerals to be mixed with water to form a slurry.

A slurry is a mixture of a solid and liquid which has a natural tendency to separate. If separation does occur several transportation, storage, and manufacturing problems can arise, including difficulty pumping or problems with production.

Brennsperse Dispersants help with the free flow of slurries by dispersing the slurry solids to slow or prevent separation. As a result, this yields a more consistent slurry.

Four positive things happen when using dispersants in your mining and slurry treatment processes:

• Drag Reduction: Dispersants reduce turbulence to allow for a more even flow.
• Slurry Stabilization: Dispersants yield a more evenly mixed slurry.
• Viscosity Improvement: Dispersants stabilize the overall viscosity of a slurry preventing
  high and low viscosities.
• Scale Control: Dispersants prevent scale formation which hinders operation.