## How is activated sludge calculated?

Excel Formulas for Activated Sludge Operational Calculations

1. Qr = (X – Xo)/(Xw – X)
2. Qw = (8.34*V*X)/(8.34*SRT*Xw)
3. VMG = V*7.48/1,000,000.
4. F:M = (8.34*So*Qo)/(8.34*%Vol*X*VMG)

## What is the common problem with activated sludge?

Filamentous bulking and foaming are common and serious problems in activated sludge operation, affecting most activated sludge plants at one time or another. Filamentous bulking is the number one cause of effluent noncompliance today in the U.S.

What is activated sludge process give one example?

The activated sludge process is a type of biological wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa.

How is SRT calculated?

The solids retention time (SRT) is the time the solid fraction of the wastewater spends in a treatment unit. It is the quantity of solids maintained in the reactor divided by the quantity of solids coming out of the reactor each day: SRT = V *Cd / Qout* Cout.

### How do you calculate SVI and SDI?

A calculation used to indicate the settleability of sludge in a secondary clarifier or effluent that is related to the calculation for sludge volume index (SVI). The weight in grams of 100 milliliters of sludge after settling for 30 minutes. SDI = 100/SVI.

### How do you calculate sludge age?

The sludge age of an activated sludge process can be calculated by dividing the pounds of suspended solids or MLSS in the aeration tanks by the pounds of suspended solids that enter the aeration tanks (Equation I. 10).

How does wastewater calculate SVI?

calculate SVI by dividing the measured (or observed) wet volume (mL/L) of the settled sludge by the dry weight concentration of MLSS in grams/L.

How is SVI calculated?

## What is the formula of SVI?

Sludge volume index ( SVI ) is calculated by dividing the settleability by the MLSS concentration.