The conventional wastewater treatment methods involve the following steps
(a) Pre-screening
(b) Aeration
(c) Sludge Management and
(d) Water Reuse.
(a) Pre-screening : Wastewater generated from domestic and industrial activities is screened to remove soil and solid particulates.
(b) Aeration : Screened wastewater is then pumped to an aeration tank. Here the microbial contaminants are removed by the biological degradation that occurs in the presence of air.
Sedimentation process : In this process, the solid particles in suspension form are allowed to settle. The particles that settle out from the suspension is known as sludge.
(c) Sludge removal : The sludge generated by the degradation process is transferred periodically from the tank for safe disposal.
Disinfection : Chlorination and ultraviolet (UV) radiation of treated water is required to remove any microorganism contamination.
(d) Water recycling : The water will then be supplied for domestic or industrial purposes.
