Page 13 - Simplified Wastewater Treatment Fundamentals_Ponds and Lagoons PT2

Stabilization Ponds & Sludge Lagoons

Stabilization Pond Efficiency of Removal Math

The Efficiency of Removal is crucial in determining how well a Pond is working to treat wastewater. The

Efficiency Formula requires the influent BOD or TSS mg/L value, known as IN and the effluent BOD or TSS

data known as OUT. When multiplied by 100, the answer will be in percent.

Efficiency Formula

In – Out x 100 = % Removal

In

Example

A Shallow Stabilization Pond has a monthly influent flow average of 187 mg/L BOD and a monthly

effluent flow average of 11 mg/L. What is the efficiency of removal?

187 mg/L – 11 mg/L x 100 = 94.1%

187 mg/L

The Pond removed 94.1% of the BOD.