​

Sodium Clay (NaAlO2) is used with great success as an Alkaline Primer flocculant (but can be incorporated into all stages of waste treatment if residual acidity is present) for slightly acidic or strongly acidic wastes. At the same time it is a powerful waste de-phosphorescent agent.

 

Its peculiarity is that it is simultaneously through neutralization of acidity (contains 22-25% Caustic Soda) and (at the same time) strong flocculant since it contains 15-18% Al2O3 (as it contains the strongest flocculating PAC) in the form of trivalent Aluminum ions. It is the only strong Alkaline flocculant in relation to the others that are acidic (eg PAC, Aluminum Sulfate, Iron Sulfate / Chloride)

 

Its use leads to better results, with easier control (dosing of a material) and in a more economical way (approximately, one pays either Soda or the flocculant or we can say that it has an overall benefit of 35-50%).

 

Liquid sodium aluminate is becoming an increasingly popular choice for phosphorus disposal in municipal and industrial wastewater. As nitrogen and phosphorus discharge limits become stricter, many plants use both biological and chemical treatment systems to reduce them.

 

ADVANTAGES OF SODIUM ALUMINATE

 

Liquid sodium aluminate is becoming an increasingly popular choice for phosphorus disposal in municipal and industrial wastewater. As nitrogen and phosphorus discharge limits become stricter, many plants use both biological and chemical treatment systems to reduce them. However, both of these treatment processes can reduce the available alkalinity and lower the pH of the waste below the discharge limits. For phosphorus precipitation, waste treatment plants usually use an inorganic flocculant such as:

• Iron chloride

• Iron sulfate

• Aluminum chloride

• Aluminum sulphate

 

These inorganic coagulants are all synthesized with acids that reduce the pH and alkalinity of water. To compensate for this, many waste treatment plants add a source of alkalinity during the treatment process. Typical sources of alkalinity include:

• Lime

• Baking soda

• Magnesium hydroxide

• Caustic soda

 

This dual chemical approach is costly and increases sludge volumes. Sodium Clay can solve this dilemma by providing a highly concentrated source of aluminum in an alkaline medium. In contrast to the acidic counterparts, Sodium Clay contributes alkalinity to the processing, thus eliminating the need for additional alkalinity. In fact, it provides almost the same amount of alkalinity as caustic soda 25% and substantially more aluminum than other aluminum-based products.

​

Sodium aluminate may contain more aluminum than acids can dissolve. One kilo is not one kilo!  When it comes to phosphorus precipitation, a pound of aluminum is not the same as a pound of iron. The aluminum atom weighs less than half the iron atom. This means that a kilo of aluminum has twice as many atoms as a kilo of iron and can be combined with twice as much phosphorus. The chemical removal of one kilo  phosphorus requires 0.87 kg of aluminum or 1.8 kg of iron. Sodium Clay provides the best value by reducing the amount of chemicals required for phosphorus precipitation.

 

Unlike iron phosphate, aluminum phosphate does not redissolve under anoxic conditions. The supply of Sodium Clay on the biological treatment front to increase pH and alkalinity is an attractive alternative to biological treatment followed by an acidic, inorganic coagulant in the effluent. The supply of Sodium Clay before the anoxic zone increases the operational flexibility and reduces the number of chemicals required in the processing process.

 

The unique ability of Sodium Clay to increase its pH and increase its alkalinity gives it more flexibility than other chemicals in relation to its future feed points. Sodium Clay can be supplied:

• At the beginning of the biological  

• In the ventilation system

• In the return mud

• In the clarifier

In fact, many units use multiple power points to optimize the benefits of Sodium Clay in their system.

 

Sodium aluminate benefits treatment plants that supply an inorganic coagulant to remove phosphorus and have low pH or insufficient alkalinity. These benefits include:

• Cost saving

• Replacing two chemicals with one

• Reduced transportation costs

• Capital savings (a supply system)

• Reduced sludge production

• Increased flexibility (multiple power points)