What is the reason for seeing this layer on the surface of sludge?

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Aqeel yousif Alshukri

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Akshay Shende

Fatemeh Ranjrouzi : The attached photographs are of aeration tank or anoxic tank ?

C K Gomathy

Hi,

Kindly refer this link:

https://www.maine.gov/dep/water/wwtreatment/activated_sludge_process_control.pdf

Best wishes

Fatemeh Ranjrouzi

Akshay Shende Clarifier