Mogden formula
In the sewage treatment, the Mogden formula is a pricing strategy used to estimate the difficulty in treating industrial wastewater. It is named after Mogden Sewage Treatment Works.
The Mogden formula calculates cost as a combination of volume, strength in terms of normal treatment oxidation demand and the suspended solids proportion. Applicable to the whole works, it also approximates the cost for tested industrial waste water that may, if treatable, be lawfully sent to a regular sewage works.
The Mogden formula is:
where:
Thus the less biologically friendly the effluent, and more solid-laden, the higher the charge should be for treating the lawful effluent.