What is the hydraulic loading on the clarifier in gallons per square foot per day?

To determine the hydraulic loading on a clarifier, one typically calculates the flow rate entering the clarifier divided by its surface area. The hydraulic loading rate is expressed in gallons per square foot per day (gallons/sq ft/day).

Choosing 551 gallons/sq ft/day suggests a specific flow rate related to the design and operational parameters of the clarifier in question. This rate indicates that for every square foot of surface area of the clarifier, 551 gallons of wastewater are treated each day. This value could be based on the optimal capacity for efficient sedimentation and removal of solids, ensuring that the treatment process works effectively without overwhelming the system, which could lead to excessive solids carryover, reduced treatment efficiency, or both.

When evaluating hydraulic loading, it's important to align with the design specifications for the type of wastewater being treated and the clarifier's dimensions to ensure that the clarifier can adequately handle the flow without operational issues. Therefore, selecting 551 gallons/sq ft/day seems to reflect a balance between efficiency and operational safety for the clarifier’s intended use in wastewater treatment.