Introduction to Wastewater Treatment (Book) Part Three

A primary clarifier can be expected to remove ___ % of suspended solids and between __ and _ % of BOD5

60 to 75%

20 to 35%

Primary clarifiers do NOT remove ___ , ____, ____ ,_____, ____

Colloidal solids, Dissolved solids, soluble BOD, soluble phosphorus, ammonia

How does a Dissolved Air Floatation Thickener work?

By adding compressed air to the bottom of the tank and using the resulting bubble curtain to lift and float solids.

The purpose of the primary clarifier or DAFT is to reduce the amount of ___ and __

BOD and TSS

Secondary treatment removes at least ___ % of the influent TSS and BOD5 resulting in effluent concentrations of __ to __ mg/L

85%

10 to 30 mg/L

TRUE or FALSE

Secondary treatment may also remove ammonia, nitrate, phosphorus

TRUE

In attached growth system such as ___, ___, ____ the microorganisms form a ____ that is attached to the _____

Trickling filter, Rotating biological contactor, packed tower