What are the types of inorganic coagulants? 【Basic Knowledge】
What is the difference between PAC and aluminum sulfate? An explanation of how to choose based on "basicity."
■What is the "basicity" of inorganic coagulants? Many inorganic coagulants are acidic chemicals, which lower the pH when added to water. The measure of how resistant the pH is to lowering is referred to as "basicity." It is determined by the ratio of hydroxyl groups (OH) to aluminum contained in the coagulant; coagulants with lower basicity tend to lower the pH more easily, while those with higher basicity are less likely to do so. ■What is polyaluminum chloride (PAC)? PAC is a representative inorganic coagulant used in drinking water, with a basicity of 50%. Compared to other inorganic coagulants, it is characterized by being less likely to lower the pH, resulting in less need for pH adjustment after addition. ■What is aluminum sulfate? Aluminum sulfate (alum) is another representative inorganic coagulant alongside PAC. It has a basicity of 0%, making it more likely to lower the pH than PAC. It is effective in removing suspended solids (SS) and is used in general wastewater treatment. The flocs produced are small and light. ■Which one should you choose? If you want to minimize pH adjustment, choose PAC; if you prioritize the removal of suspended solids, consider aluminum sulfate. You can select based on your objectives, water quality, and cost. Please feel free to consult with us first.
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