About coagulating agents
What is coagulant / coagulating agent?
Coagulation is a process of combining particles, colloids, and dissolved organic material into larger aggregates (Amirtharajah and O'Melia, 1990). These aggregates are then removed from the water usually by clarification and filtration processes in most conventional WTWs.
How do you make coagulant?
To induce coagulation, a coagulant (typically a metallic salt) with the opposite charge is added to the water to overcome the repulsive charge and "destabilize" the suspension. For example, the colloidal particles are negatively charged and alum is added as a coagulant to create positively charged ions.
What chemicals are coagulants?
Traditional chemical coagulation uses aluminum and iron coagulants. The most common aluminum coagulants are aluminum sulfate, aluminum chloride, and sodium aluminate. Iron coagulants include ferric sulfate, ferrous sulfate, ferric chloride, and ferric chloride sulfate.
What is coagulant process?
Coagulation is a process used to neutralise charges and form a gelatinous mass to trap (or bridge) particles thus forming a mass large enough to settle or be trapped in the filter.
What is the natural coagulant?
Natural coagulant is a naturally occurred; plants based coagulant that can be used in coagulation-flocculation process of wastewater treatment for reducing turbidity.
How coagulants are made?
Inorganic coagulants support the separation of dissolved and particulate impurities from the water. The raw materials are based on abundant natural resources (aluminium and iron) and high-quality by-products.
How coagulants work?
Coagulants which are positively charged metal salts (Me+) react with the negatively charged colloids in the water to form bigger flocs.
Then the particles form larger, heavier flocs (flocculate).
Like larger particles, the flocs can be separated from the water using methods such as sedimentation, floatation or filtration.
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