Extended Aeration Activated Sludge Process Technology For Sewage Treatment Plant (STP)


As the name suggests, it is a modified form of Activated Sludge Treatment system. Extended aeration is a method of sewage treatment using modified activated sludge procedures. Extended aeration agitates all incoming waste in the sludge from a single clarifies. Extended Aeration plants provide a low cost, odor and nuisance-free Sewage Treatment Plant that produces a high degree of treatment. Extended aeration treatment plants are used worldwide to provide simple and effective wastewater treatment.



The combined sludge starts with a higher concentration of inert solids than typical secondary sludge and the longer mixing time required for digestion of primary solids in addition to dissolved organic produced sludge requiring greater mixing energy input per unit of waste oxidized. In extended aeration process, the raw sewage moves straight to the aeration tank for treatment. The whole process is aerobic. This simplification implies longer aeration time which has earned for the process, the name "extended aeration". The BOD removal efficiency of the extended aeration process is higher than activated sludge process which makes it especially desirable to use where it is to be followed by tertiary treatment for reuse.

The standard basis of design of the Extended Aeration Process includes an aeration system, providing a 24-hour detention time and a final settling tank, with an effective 4-hour detention time. Diffused air is introduced into the aeration tank, this provides the proper environment for the development of aerobic bacteria. These bacteria thrive on the materials contained in the wastewater. The prolonged period of aeration, in addition, oxidizes a portion of the solids in the system. Oxygenation by diffused aeration provides operating flexibility and standby reserve to meet the demanding requirements of varied package plant applications. Separation of the solids from the mixed liquor developed in the aeration tank takes place in the settling compartment. The clarified effluent is withdrawn for reuse or discharged into a receiving stream from the top of the settling tank. The settled solids are rapidly pumped from the bottom of the settling tank back to the aeration system. These Extended Aeration Plants are proven workhorses, providing excellent removal efficiency of BOD and TSS. Only minimal routine housekeeping and operational tasks are required of the plant operator.

Advantages

  •         Low capital operating costs
  •         Excellent treatment performance with low sludge production
  •         Stable during shock and stress loading
  •          Fulfilments of regulatory requirements
  •        Ease of installation
  •        Low maintenance and operations requirements
  •         Variable blower operation for seasonal load adjustment 







Comments

  1. waterdesigntechnologiesMarch 7, 2024 at 9:24 PM

    Impressive insights on Sewage Treatment Plant (STP)! The content provides a comprehensive understanding of the industry, highlighting the key factors and considerations. Well done!

    We at Water Design Technologies With two decades of expertise in the Waste Water Treatment Sector, our extensive experience encompasses various Wastewater Treatment plants, including the Sewage Treatment Plant (STP).

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