The extended aeration process is one of the modifications of the ASP. It is a complete mix system and provides biological treatment for the removal of biodegradable organic wastes under aerobic conditions. Air may be supplied by mechanical or diffused aeration to provide the oxygen required to sustain the aerobic biological process. Mixing must be provided by aeration to maintain the microbial organisms in contact with the dissolved organics. Since there is complete stabilization occurs in the aeration tank, there is no need for a separate sludge digester. The further primary settling tank is also omitted and settleable organic solids are also allowed to settle in the aeration tank due to the long detention time in the aeration tank. The process flow diagram of the extended aeration system is furnished below. The treatment plant provides the proper environment, sufficient oxygen, and other elements which allow the bacteria to consume the organic matter and to live and multiply within the treatment plant. In this way, the aerobic bacteria and microbes decompose the sewage and waste to a stable form – odor and nuisance-free.

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