Balancing Tank

A balancing tank is a key part of a wastewater management system. Also known as an equalization or EQ tank, this is designed to contain a large volume of wastewater relative to what is flowing in and out.

The benefit:

The large volume averages out the swings and spikes.

Concentration swings are blended into the whole volume to provide a more predictable average.

Balancing Tank Smoothing

The result:

High and low pH spikes are balanced and/or neutralized to meet regulatory requirements.

Other benefits of a balancing tank include:

Smooths volume 'shocks' by allowing the level in the tank to rise and drop.

Allows for additional settling of solids.

Controls the outflow to prevent downstream flow shocks at municipal wastewater treatment facilities.

Why Does it Matter?

The strength and composition of the wastewater in floor drains can fluctuate quite a bit with production, packaging and cleaning. This can lead to major swings in pH, and the concentration of key wastewater parameters such as BOD, solids, TKN and TP.

If wastewater is not properly managed, the variation in strength and flowrate can cause problems for municipal treatment facilities and result in potential high surcharge costs for craft breweries.

Design Concepts

A balancing tank requires a relatively large tank volume capacity. Why?

To handle periods of high wastewater flow, the tank needs to have a minimum of 6 to 12 hours of retention volume, as well as extra volume capacity to handle several hours of operating flow.

Balancing Tank

The balancing tank design is brewery specific and should be discussed with a design engineer.

Key tank design considerations should include:

In-ground or above.

Type of materials – make sure they are resistant to pH, chemicals and temperatures (e.g., stainless steel).

Make sure the flowrate leaving the tank can be measured and controlled.

Make sure it is accessible for easy removal of settled solids.

Include a mixer to facilitate blending of spikes and swings.