DBP Removal | Comparing Technologies

Comparing In-Tank Aeration Systems

In-tank aeration is the process of exposing finished drinking water to air and has been proven to be an effective way to remove Trihalomethanes (THMs). There are several different systems to choose from, but capital and energy costs of technologies vary greatly.

Bubble Aeration

In a bubble aeration system, air is injected at the bottom of a tank to create bubbles. As the bubbles rise, THMs diffuse from the water into the bubble, until the bubble becomes saturated with THMs. Eventually, the bubble reaches the surface and pops – delivering THMs into headspace.

Surface Aeration

In a surface aeration system, a motorized device churns the water and air together, allowing THMs to transfer from water into the air.

Spray Aeration

Spray aeration is the process of pumping water from the floor of the tank to the ceiling, and spraying it down through a set of spray nozzles. As each droplet flies out of spray nozzle, THMs evaporate out of the droplet and into the air.

Energy Costs

Over the lifecycle of an in-tank aeration system, energy costs dominate. Different aeration technologies can vary in their effectiveness and energy usage, so it is important to look at the energy consumption versus MGD of water treated. 

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