| Quantity: | |
|---|---|
Parameter/Focus Area | Description/Information |
Chemical Name | Calcium Hydroxide (Hydrated Lime) |
Formula | Ca(OH)₂ |
CAS Number | 1305-62-0 |
Appearance | White powder or granular form |
Solubility in Water | Moderately soluble, forms an alkaline solution |
pH Adjustment | Raises the pH of water, making it alkaline |
Precipitation of Heavy Metals | Forms insoluble hydroxides with heavy metals, facilitating their removal |
Neutralization of Acids | Effective in neutralizing acidic waters, restoring balance |
Pathogen Reduction | Enhances the effectiveness of disinfection processes by increasing the pH, aiding in the destruction of pathogens |
Organic Matter Removal | Improves coagulation and flocculation processes, aiding in the removal of suspended solids and organic matter |
Alkalinity Increase | Increases water alkalinity, which is beneficial for fish and aquatic life |
Odor Control | Neutralizes offensive odors caused by organic pollutants and hydrogen sulfide |
Safety & Handling | Non-toxic and non-hazardous when used properly, but requires caution due to its alkalinity |
Cost-Effectiveness | Cost-effective solution for water treatment, especially in large-scale applications |
Environmental Impact | Environmentally friendly, produces minimal waste and does not contribute to water pollution |
Storage Stability | Stable under normal conditions, but should be kept dry to prevent carbonation |
Application Methods | Can be applied directly to water or as a slurry, with dosing equipment typically required for precise control |
Compliance & Standards | Meets international standards for water treatment chemicals, ensuring safety and effectiveness |
Applications in Water Treatment
1. PH Neutralization
Adjusting Water Acidity: Calcium hydroxide is highly alkaline and effectively neutralizes acidic water, bringing the pH level to a neutral or near-neutral range.
Protecting Pipelines: By neutralizing acidic water, calcium hydroxide helps prevent corrosion of pipelines and extends their lifespan.
2. Heavy Metal Removal
Precipitation of Heavy Metals: Calcium hydroxide reacts with heavy metal ions such as lead, mercury, cadmium, and chromium, forming insoluble hydroxide precipitates that can be removed from water.
Reducing Environmental Risk: Effective removal of heavy metals minimizes their environmental impact and ensures water safety.
3. Phosphate Removal
Reducing Phosphorus Levels: In eutrophic waters, calcium hydroxide reacts with soluble phosphates to form insoluble calcium phosphate precipitates, reducing phosphorus content and controlling algae blooms.
Improving Water Clarity: Phosphate removal enhances water clarity and overall water quality.
4. Fluoride Removal
Unique Precipitation with Fluoride: Calcium hydroxide combines with fluoride ions to form insoluble calcium fluoride precipitates, effectively removing fluoride from water.
Ensuring Water Safety: Fluoride removal is crucial for protecting public health, especially in areas with high fluoride levels in water sources.
5. Coagulation and Flocculation
Improving Sedimentation: Calcium hydroxide enhances coagulation and flocculation processes, causing suspended particles and organics to aggregate into larger flakes that can be easily removed by sedimentation or filtration.
Reducing Sludge Production: Efficient flocculation reduces sludge production, lowering overall treatment costs.
6. Disinfection and Sterilization
Killing Pathogens: Calcium hydroxide exhibits a certain degree of disinfection properties, capable of killing bacteria and viruses in water, reducing the risk of waterborne diseases.
Enhancing Water Hygiene: Disinfection improves the hygienic quality of water, making it safer for human consumption and use.
7. Improving Sludge Dewatering Performance
Changing Sludge Characteristics: As a chemical conditioner, calcium hydroxide alters the properties of sludge, improving its dewatering performance.
Reducing Treatment Difficulty: Enhanced dewatering reduces the difficulty and cost of sludge treatment and disposal.
Benefits in Water Treatment
Cost-Effective: Calcium hydroxide is a cost-effective treatment option compared to other chemicals, making it suitable for large-scale water treatment applications.
Wide Availability: Its production raw material, limestone, is abundant and widely available, ensuring a stable supply for water treatment needs.
Environmental Compatibility: As a naturally occurring compound, calcium hydroxide offers a more environmentally friendly treatment alternative compared to some synthetic chemicals.
