![]() In most cases, it is considered as 2.5 hrs.ĥ. ![]() This majorly depends on the amount of TSS and BOD present in the raw waste water. What is the detention time considered while designing a primary sedimentation tank which is followed by an activated sludge treatment tank?Ĭlarification: The detention time considered while designing a primary sedimentation tank, which is followed by activated sludge treatment tank is 1.5-2.5 hrs. In most cases, it is considered as 2 hrs.Ĥ. What is the detention time considered while designing a primary sedimentation tank which is followed by a secondary treatment tank?Ĭlarification: The detention time considered while designing a primary sedimentation tank is 1.5-2.5 hrs. Also, it is classified as preliminary treatment.ģ. This primary sedimentation is prior to the clarifiers and flocculators. In a primary sedimentation tank in percentage what is the amount of BOD removed?Ĭlarification: In a primary sedimentation tank, around 20-40% of BOD is removed. This is usually followed after the screens.Ģ. ![]() In a primary sedimentation tank in percentage what is the amount of TSS removed?Ĭlarification: A primary sedimentation tank removes around 50-70% of TSS. ![]() Waste Water Engineering Interview Questions and Answers for Experienced people on “Sedimentation Tanks – 2”.ġ. ![]()
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