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2. Alum and Other Coagulants Aluminum sulfate, commonly known as alum, is used as a coagulant in the water treatment process. It helps to clump together small particles and impurities in the water, making it easier to remove them during sedimentation and filtration. Other coagulants, such as ferric chloride and polyaluminum chloride, may also be utilized depending on the specific requirements of the water source.


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The integration of physical and chemical treatment methods is vital for effective water and wastewater management. Each technique has its strengths and serves specific purposes within the treatment hierarchy. As water scarcity and pollution continue to escalate globally, advancements in these treatment processes will be critical for sustainable water resource management.


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1. Sedimentation This is one of the simplest methods where water is allowed to sit in a large tank so that heavier particles can settle to the bottom due to gravity. The clarified water can then be removed from the top, leaving sediment behind.


Following coagulation, flocculants such as polyacrylamide may be added to further enhance the formation of flocs. Flocculants are polymer compounds that help to bind the particles together, increasing their size and weight. This process facilitates their removal from the water during sedimentation or filtration stages. Enhanced removal of suspended solids also leads to lower levels of pathogens, chemicals, and organic matter in the treated water.


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