Poly Aluminium Chloride in Water Treatment: A Clear Solution for Cleaner Water

Water is essential for life, and access to clean, safe drinking water is a fundamental human right. Yet, water sources worldwide face contamination from various pollutants, necessitating effective treatment methods to ensure the safety and purity of this vital resource. Poly Aluminium Chloride (PAC) has emerged as a valuable and versatile tool in water treatment processes, it plays a crucial role in making water safe for consumption, industrial use, and environmental preservation.

Why we use Poly Aluminium Chloride (PAC) for water treatment?

Poly Aluminium Chloride is a chemical compound with a simple but effective composition. It consists of aluminium and chlorine atoms, combined to form a series of aluminium salts. Outperforming traditional rivals like aluminum sulfate and ferric chloride, PAC has surged in popularity within the water treatment industry. Its widespread adoption is due to its exceptional coagulation efficiency and its adaptability to a wide pH and temperature range. Poly Aluminium Chloride is now a staple coagulant in water and wastewater treatment across the globe, including in the United Kingdom, the United States, France, Canada, China, and Italy.

A key feature of Poly Aluminium Chloride is its ability to stably neutralize colloidal particles, setting the stage for efficient coagulation and flocculation. As wastewater passing through the sedimentation pond, Poly Aluminium Chloride helps solid particles coagulate and settle, resulting in clearer, safer water. Its optimal performance occurs at a neutral pH range of 6.5 to 7.6. Poly Aluminium Chloride achieves this by generating hydroxyl ions and polyvalent anionic polymers, which facilitate the coagulation and flocculation of suspended particles to improve water quality.

The role of Poly Aluminium Chloride in water treatment and the working principle

  • Coagulation: Poly Aluminium Chloride’s initial role in wastewater treatment is coagulation. As it is introduced into the wastewater, Poly Aluminium Chloride disrupts the electrostatic repulsion among particles, thereby causing them to aggregate. Its positively charged aluminium ions neutralize the negatively charged particles, making them more prone to coming together.
  • Flocculation: Following coagulation, Poly Aluminium Chloride’s prowess in flocculation comes to the fore. During this phase, the neutralized particles gently merge into larger flocs. A crucial aspect to bear in mind during this process is the precise quantity of coagulant employed. An incorrect dosage can yield counterproductive results. This harmonious amalgamation is essential for the next step, where these flocs are separated from the water, leading to cleaner effluent.
  • Clarification: The process of clarification, the final step, hinges on Poly Aluminium Chloride’s ability to ensure that the flocs formed are substantial and easily separable. PAC often with the assistance of other additives, facilitates the bonding of these particles, culminating in their settlement. Ultimately, this results in clear water ready for safe discharge or further treatment.

Applications of Poly Aluminium Chloride in Water Treatment

  • Drinking Water Treatment: Poly Aluminium Chloride is commonly used to treat raw water from rivers, lakes, or wells. It effectively removes turbidity, microorganisms, and dissolved organic matter, ensuring that the water is safe to drink.
  • Wastewater Treatment: In wastewater treatment plants, Poly Aluminium Chloride aids in the removal of contaminants and pollutants, improving the quality of effluent water before it is released into the environment.
  • Industrial Processes: Many industries rely on Poly Aluminium Chloride to ensure the quality of their process water. From paper mills to food processing plants, PAC contributes to efficient production and environmental responsibility.

How much quantity is needed for water treatment with Poly Aluminium Chloride?

Poly Aluminium Chloride (PAC) is a vital tool in sewage treatment, often used as a yellow or yellowish-brown solid powder. To find the correct dosage of Poly Aluminium Chloride for your specific application, take the following corresponding information for your reference:

  1. National Standards: In most countries, the standard content of solid PAC is 28%, and for the liquid form, it’s 10%. Before using solid PAC, dissolve it to a 10% concentration, usually achieved through gas or mechanical mixing. This standard is a relatively universal standard, but different countries may have subtle differences in relevant standards. As far as we know, this standard also applies to the United States, but each state’s standards may vary slightly. If you don’t know the PAC standard usage content corresponding to your country or state, you can check the standards and regulations issued by the relevant local departments. For example, if you’re in New York or California, you can find relevant information in your local public health department’s standards and regulations for water treatment chemicals (including PACs)
  2. Turbidity-Based Dosage: The ideal dosage depends on the raw water’s turbidity. In general, when the raw water’s turbidity falls within the range of 100-500mg/L, a dosage of 10-20kg per 1000 tons of water is typical. This can be fine-tuned through pilot testing.
  3. Variations for Urban and Industrial Wastewater: When treating urban or industrial wastewater, the optimal dosage and concentration can differ. To ensure effectiveness and efficiency, it’s advisable to conduct small-scale tests and field trials.
  4. Mixing and Application: Prepare PAC by mixing solid PAC with water in a 1:3 ratio at room temperature. Dilute this mixture with 25-30 times the volume of clear water for around 30 minutes. Then, introduce it into the water for treatment.
  5. Drinking Water Purification: For drinking water purification, the consumption is typically 1/100,000 of the raw water. In other words, for every thousand tons of water, you’d use about 15kg of solid PAC. Experimentation can help you determine the precise dosage based on local water quality and turbidity levels.

Before deploying Poly Aluminium Chloride, conducting a small-scale test to ascertain the correct dosage is a prudent approach. This ensures that you achieve the desired treatment effect while minimizing waste and optimizing cost-efficiency.

Poly Aluminum Chloride (PAC) has established itself as a reliable and versatile coagulant and flocculant in water treatment. Its ability to effectively remove contaminants and improve water quality has made it a valuable tool in the quest for clean, safe, and accessible water sources. With the growing global demand for clean water, PAC’s role in water treatment is more critical than ever, contributing to the well-being of communities, industries, and the environment alike.

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