How is caustic soda used in water treatment industry?
water treatment industry to raise the pH of water mainly used caustic soda. it does this by absorbing water and carbon dioxide, and is commonly an integral component of water treatment.
Caustic soda is a white, alkaline, flakes and odorless packed in drums. Caustic soda (sodium hydroxide, or NaOH) is a commonly used water treatment chemical that raises the pH of water by absorbing water and carbon dioxide, and also hydrochloric acid, hydrated lime, sulfuric acid, are chemicals that help make contaminants in wastewater stick together, so they will be easier to remove, the optimum dosage to reach the recommended pH of 12 is around 26 g of soda per litter of faecal sludge. The exact amount, however, de pends on the characteristics of blackwater or sludge. Its effect can be enhanced by ensuring complete mixing, a longer contact time and a higher dosage of caustic soda. The pH should be maintained above pH 12 for a minimum of 2 hours to ensure an adequate reduction of pathogens.
Description of Caustic soda water treatment industry process
The Caustic Soda Treatment process should be undertaken as a batch process and can be used to treat both solid and liquid sludge. After treatment, pH decreases towards neutral usually within 24 hours. After neutralization, the supernatant can be pumped off and safely infiltrated into a Soak Pit . Care should be taken in areas with high a groundwater table as the supernatant still contains ni trogon and phosphorous which can pollute water bodies. The treated solid fraction at the bottom may be applied as a soil amendment or dried and used as cover for sanitary landfill om water.
What happens when caustic soda reacts with water?
pH value will increase and become much greater than 7 on adding caustic soda to water. Caustic soda is general name for NaOH which is a strong base. So, when we add caustic soda to water, it will make the water basic in nature. A basic solution has a pH greater than 7.
The reaction will be Exothermic, where heat will be released. Sodium hydroxide is considered a strong base and as such is able to completely and fully disassociate in aqueous solution.
why used caustic soda in liquid like water?
It is used primarily to increase and control pH in water-based fluids. Is a source of hydroxyl ion to increase and control ph.
What is the ratio of caustic soda to water?
Regular treatment with half strength mix (250g Caustic Soda to 6 litters of water) will prevent further blockages. Cleaning & sanitizing (dustbins, kennels, stables, driveways etc.) Add 1-2 tablespoons of Caustic Soda per 5 litters of water
Effect of Soda Ash and Caustic Soda in Water treatment
This treatment method is used if the water is acidic (low PH). Soda ash (sodium carbonate) and sodium hydroxide raise the pH of the water to near neutral when injected into a water system. Unlike neutralizing filters, they do not cause hardness problems in treated water.
Injection systems are point-of-entry systems. A corrosion-resistant chemical feed pump injects soda ash or sodium hydroxide solution into the water to raise the ph. The solution should be fed directly into the well to protect the good casing and pump from corrosion.
If the water needs to be disinfected as well as neutralized, dual treatment is possible within the injection system by adding a chlorine solution (sodium hypochlorite) along with the neutralizing chemical. Injection systems can treat water with a pH as low as 4.