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Extended Aeration Plant

The document discusses the optimization of extended aeration plant design for improved wastewater treatment efficiency. Extended aeration plants use an activated sludge process with long aeration and sludge retention times to treat organic matter and nutrients. Typical design parameters include an 18-24 hour hydraulic retention time, 20-30 day sludge retention time, and 2-4 mg/L dissolved oxygen. These plants effectively treat wastewater to produce low concentrations of BOD, TSS, nitrogen and phosphorus but require more energy and complex operation than conventional systems.

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59 views4 pages

Extended Aeration Plant

The document discusses the optimization of extended aeration plant design for improved wastewater treatment efficiency. Extended aeration plants use an activated sludge process with long aeration and sludge retention times to treat organic matter and nutrients. Typical design parameters include an 18-24 hour hydraulic retention time, 20-30 day sludge retention time, and 2-4 mg/L dissolved oxygen. These plants effectively treat wastewater to produce low concentrations of BOD, TSS, nitrogen and phosphorus but require more energy and complex operation than conventional systems.

Uploaded by

Edna Asare
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Optimization of Extended Aeration Plant Design for Improved Wastewater Treatment

Efficiency

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Optimization of Extended Aeration Plant Design for Improved Wastewater Treatment

Efficiency

Extended aeration plants are a type of activated sludge process used in wastewater

treatment designed to provide extended aeration and longer sludge retention times (SRT) to

enhance the biological treatment of organic matter and nutrients (Metcalf & Eddy 2014). This

process is particularly effective in treating municipal and industrial wastewater with high

organic loads making it a popular choice for various applications.

The extended aeration process involves the introduction of air or oxygen into a large

aeration tank where the wastewater and activated sludge (a mixture of microorganisms) are

combined and aerated for an extended period typically 18-24 hours (Tchobanoglous et al.

2014). This extended aeration period allows for the complete oxidation of organic matter the

nitrification of ammonia and the stabilization of the sludge. The extended SRT also promotes

the growth of diverse microbial communities which can effectively remove a wide range of

pollutants including organic matter nitrogen and phosphorus (Grady et al. 2011).

The typical design parameters for an extended aeration plant include a hydraulic

retention time (HRT) of 18-24 hours a SRT of 20-30 days and a dissolved oxygen (DO)

concentration of 2-4 mg/L in the aeration tank (Metcalf & Eddy 2014). The performance of

an extended aeration plant is generally characterized by its ability to produce a high-quality

effluent with low concentrations of organic matter suspended solids and nutrients. Typical

effluent quality from an extended aeration plant can include biochemical oxygen demand

(BOD) and total suspended solids (TSS) concentrations of less than 10 mg/L and total

nitrogen and total phosphorus concentrations of less than 3 mg/L and 1 mg/L respectively

(Tchobanoglous et al. 2014).

The extended aeration process offers several advantages over conventional activated
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sludge systems including improved organic matter and nutrient removal increased process

stability and reduced sludge production (Grady et al. 2011). However the extended aeration

process also requires a larger aeration tank higher energy consumption and more complex

operational management compared to conventional systems.

In conclusion the extended aeration plant is a versatile and effective wastewater

treatment technology that can be optimized to meet the specific needs of various applications.

By understanding the design parameters and performance characteristics of this process

engineers can develop and implement extended aeration systems that effectively treat

wastewater and protect the environment.


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References

Grady, C. P. L., Daigger, G. T., Love, N. G., & Filipe, C. D. (2011). Biological wastewater

treatment. CRC press.

Metcalf & Eddy. (2014). Wastewater engineering: treatment and resource recovery.

McGraw-Hill Education.

Tchobanoglous, G., Stensel, H. D., Tsuchihashi, R., & Burton, F. (2014). Wastewater

engineering: treatment and resource recovery. McGraw-Hill Education.

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