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In secondary treatment, bacteria are added to the wastewater to ingest organic solids, producing secondary sludge that settles to the bottom. Tertiary treatment filters the water to remove whatever solids remain, disinfects it with chlorine, and removes the salt.
Also found in: Medical, Wikipedia. [â²wÈ¯dÂ·Ér âtrÄtÂ·mÉnt] (civil engineering) Purification of water to make it suitable for drinking or for any other use. the treatment of water obtained from natural water sources and used in steam and hot-water boilers or for various industrial purposes. Water treatment is carried out at steam power plants, during transport, at municipal utilities, and at industrial enterprises.