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LAKASA Neutralization Tank

LAKASA Neutralization Tank is also called Dilution Tank, designed to receive, dilute and neutralize corrosive and harmful chemical wastes before allowing such materials to be discharged into the pubic sewers or the environment, is suitable for centralized installation for neutralizing and dilution of laboratory acids and chemicals.
Neutralization of corrosive, toxic and flammable wastes is necessary to the environment and piping systems, even when quantities and concentrations are small. Such wastes can cause physical damage to a building's piping or outside sewer systems and, if effluent is being discharged to the environment (such as rivers and lakes), severe damage can result to wildlife and water sources.
Neutralization is the process whereby acids and alkalis are rendered harmless. The degree of neutralization can be measured by a system known as pH (positive Hydronium ions). The degree of measurement is a pH number of 7, which is neutral. Acids range from 0 to 6.99. Alkalis range from 7.01 to 14. The smaller the number, the higher the content of acidic waste. The higher the pH number, the higher the alkaline waste.
End-results of Neutralization Process
The chemical reaction between Calcium Carbonate and acidic waste water will produce by-products of
neutralized waste, carbon dioxide and neutral salts that can be safely discharged into municipal sewer

Calcium Carbonate
Neutralizing Agent
+ Acidic
Waste Water
= Neutralized Waste,
Carbon Dioxide & Neutral Salts

Places recommended for use

Recommended to be installed in acid waste drainage systems for medical and research laboratories, industrial battery charging stations, educational institutions and processing equipment. LAKASA Neutralization Tank is recommended for preliminary treatment for acidic wastewater. Therefore the effluent should be channeled to nearest sewer for further process.

Capacity & Sizing

LAKASA Neutralization Tank is designed for intermittent flow of acidic wastewater which attempts to achieve an average retention time of > 30 minutes, as such the interaction and dilution to be taken place between the acidic wastewater and the calcium carbonate based neutralizing agent.

Proper functioning of the LAKASA Neutralizing System requires determining water flow or the volume of incoming acidic waste water, in order to achieve sufficient retention time for the neutralizing process to take place (see figure i). The initial rate of neutralization is rapid, however, as the pH of the acid waste rises, the rate of neutralization slows down. Neutralization reaction time of more than 45 minutes should achieve a safe pH level or a level which is considered high enough to be easily diluted with sanitary waste.

Environmental Quality Act, 1974

If the pH of water is too high or too low, the aquatic organisms living within it will die. pH can also affect the solubility and toxicity of chemicals and heavy metals in the water. The majority of aquatic creatures prefer a pH range of 6.5-9.0, though some can live in water with pH levels outside of this range. As pH levels move away from this range (up or down) it can stress animal systems and reduce hatching and survival rates. The further outside of the optimum pH range a value is, the higher the mortality rates.

According to the Environment Quality Act, the effluent with pH value of 5.5 to 9.0 is acceptable under its standard B requirement.


  1. For underground installation, construct a solid manhole sump for housing the Neutralization Tank.
  2. Manhole sump cover should normally be higher a bit the floor level OR construct a drain surrounding the cover to channel away most rain water and prevent in from entering the sump. The sump should also allocate four corner water exit at lowest possible 4 sides corners for the in case splashed into rain water to escape and seep into the earth outside the sump.
  3. It is recommended to use light sand for back fill. Be sure backfill is free of sharp stones and foreign matter to avoid punctures. (DO NOT PUT SAND INTO NEUTRALIZATION TANK!)
  4. Place LAKASA Neutralization Tank at a firm & balance concrete base.
  5. Inlet & outlet is connected accordingly and properly. Do Not Install Backwards.
  6. Neutralization Tank is to be filled up with full baskets of Calcium Carbonate stones.
  7. Neutralization Tank is to be filled up with clean water until it reaches static water level. Water added to the tank helps facilitate dilution.
  8. LAKASA Neutralization is ready for operation


The volume of Calcium Carbonate neutralizing stones and thus the neutralizing capacity of the system will be reduced gradually during the neutralizing process. There are various factors such as flow rate, concentration of acid waste, and temperature, determine the consumption rate of the Calcium Carbonate Neutralizing Agent.

To ensure maximum performance, a full charge of the neutralizing agent should be maintained. Initially, inspection of the agent level should be made once a month. When the rate of consumption is determined.

A maintenance schedule should be established to observe and maintain proper limestone levels in the tank. Calcium Carbonate neutralizing stones replacement should be performed at regular intervals. Typically, once every one to three months is sufficient. However, these intervals can be increased or decreased based upon application needs and performance.

The neutralizing stones supplied are 1-3" in diameter and have a calcium carbonate content certified to be in excess of 90%. Solids in the waste stream can plug the tank and should be avoided.

Conclusion :

  1. Retention time of > 45 minutes will normally achieve optimum neutralization process.
  2. LAKASA Neutralization Tank can increase pH of acidic water of initial pH~1.6 to pH~5.0 at the average of 0.12/minute and limestone requirement of 12kg/unit pH change.
  3. The pH change is about 0.10 per kg limestone used.
  4. The temperature of the water remains stable during the whole neutralization process.
  5. The performance evaluation exercise on the LAKASA Neutralization Tank was limited in simulating the actual mode of application. There was no actual movement of liquid through the limestone during the study conducted by SIRIM. The efficiency of the neutralization tank is expected to increase with flow rate adjustment in an actual installation.
  6. The volume of limestones (Calcium Carbonate based neutralizing agents) and thus the neutralizing capacity of the system will be reduced gradually during the neutralizing process.
  7. A maintenance schedule should be established to observe and maintain proper limestone levels in the tank. Limestone replacement should be performed at regular intervals.


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