Wet air scrubber systems provide an excellent blend of high efficiency and straightforward operation, making them better than traditional scrubbing methods. Modern wet scrubbers don’t require chemical addition or expensive media replacement resulting in a highly economical solution for the biogas scrubbing process.

Wet air scrubbers advantages:

• Wet scrubbers protect boilers and biogas engines from corrosion and premature failure;
• Corrosion-free materials used in scrubber systems’ construction prolongate the life of the desulfurization unit;
• The operating costs of wet air scrubber systems are low because there are no requirements for chemicals or consumable absorbent media.

The functioning principle of wet air scrubbers relies on a scrubber tower featuring a non-blocking inlet distribution system and two layers of non-blocking fixed, modular media. It is important to highlight that the biogas undergoes treatment with aerated, sulfide-free wastewater inside the scrubbing tower.

Typically, this type of “solution” from the aeration tank of an air treatment system is used as the scrubbing liquid since the activated sludge is considered ideal for air treatment due to its generally high pH and corresponding buffer capacity. Sulfides in the biogas are dissolved in the liquid during the air treatment process, then they are “absorbed by the biomass within the wash water and affixed to the internal media, and partially oxidized like oxygen (air) is added to the wet scrubber in very small amounts”.

The wet air scrubber system provides about 80-95% sulfide removal in a single stage. The performance of a single-stage scrubber greatly relies on the height of the desulfurization tower construction. It is also possible to create two-stage wet air scrubbers, they offer a combined removal efficiency of more than 99% in numerous cases.

The wet scrubber is usually installed at an elevation higher than the activated sludge air treatment basin, where the treatment solution passes to provide a gravity return of the “spent” scrubbing liquid to the aerobic system. It is feasible to design models of scrubber systems that incorporate a water reservoir and a pumped recirculation loop if necessary.

Finally, the pressure loss of wet air scrubbers is low, hence there is no need for biogas blowers. Modern scrubbing systems provide an air treatment process at a constant rate at all times, for all flows and H2S concentrations. Thus, the removal efficiency of wet scrubbers is considered to be consistent throughout the scrubber’s height and width.

If you are looking for the best air treatment device to improve air quality, Redwood Technology offers a cutting-edge type of wet scrubber – a Multi-Vortex wet air scrubber.

Redwood technology is a fast-growing vendor of wet air scrubbers. The multi-vortex scrubber can remove gas emissions, dust, vapors, and other pollutants from a gas stream. It is an innovative technology created to save water that makes it more cost-efficient and differs from other types of scrubbers.  If you have any questions or would like to purchase a multi-vortex wet air scrubber, please contact us at info@rdwd.tech