A few months ago, I wrote a column addressing when it makes sense to add a flow equalization tank to improve system operation and efficiency. If you recall, a flow equalization tank utilizes timed dosing for uniform delivery of sewage to a component over a period of several days rather than all at once. In the case of a pressure distribution system, this can spread out large flow events preventing periodic hydraulic overloads to the soil treatment and dispersal area. In the case of aerobic treatment units, this means spreading flow out to provide aerobic bacteria in the tank adequate
