Solids contacting is especially beneficial for lime treatment because it reduces the deposition problems inherent in once-through, rapid-mix, flocculation systems. Waste-water treatment facilities provide solids-contacting by maintaining or recycling large amounts of previously formed precipitates in contact with the wastewater and adding lime.
Several types of solids-contact treatment units are available. These units were originally developed for lime-softening water treatment and are effective for lime treatment of wastewater.
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