1. Aquasust Disc Diffuser Product Description：
Fine Bubble Diffuser Aquarium systems are located in an array in deep multi chamber basins. The spacing of the fine bubble diffusers is important and typically is less than or equal to 4 square feet per diffuser. The arrays are designed to maximize ozone transfer efficiency. The connecting pipe can be stainless steel or PVC. The submerged level of the diffuser impacts ozone transfer efficiency. At sea level, the diffusers are typically submerged 16 to 20 feet deep. Different ceramic materials produce different pressure drops as a function of the gas flow. Transfer efficiency for air fed ozone generators and bubble contact diffusers is approximately 85% while for oxygen fed ozone generators feeding high concentration ozone to bubble diffusers the transfer efficiency can be 95%.
The chambers create a serpentine path for the water to travel with the objective of creating plug flow through the contactor and maximizing the hydraulic detention time (minimizing short circuiting of the flow through the contactor). Not all chambers of the contactor will necessarily have diffuser arrays on the bottom. In drinking water treatment, where chemical oxidation is the objective 2-4 chambers are used. In drinking water treatment for disinfection, 6-8 chambers are used. If inactivation of Cryptosporidium is needed 10 or more chambers might be employed.
Fine Bubble Diffuser Aquarium are normally positioned in the first 1-3 chambers of the contactor. The flow through the chambers with the diffusers can be alternating counter current/co-current flow or all counter current. Counter current flow enhances transfer efficiency. Since the first chamber will be exposed to water with the highest ozone demand, more diffusers should be employed here.
A discussion of bubble diffuser contactors can also be found elsewhere in the website in a presentation on surface water treatment rules and in a presentation discussing drinking water plant operations . These papers contain illustrations and calculations regarding the effectiveness of various designs.
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