Wet air scrubber systems offer an ideal combination of high performance and simple, efficient operation making it superior to standard scrubbing technologies. Modern wet scrubbers do not need for chemical addition or costly media replacement resulting in a highly economical solution for biogas scrubbing process because operating costs are considered to be pretty low.
To be more precise, the advantages of wet air scrubbers are the following:
- Wet scrubbers protect boilers and biogas engines from such problems as corrosion and premature failure;
- Herewith, corrosion-free materials used in scrubber systems’ construction prolongate the life of the desulfurization unit;
- The operating costs of wet air scrubber systems are quite low because there are no requirements in chemicals or consumable absorbent media.
The operating principle of wet air scrubbers is based on a scrubber tower consisting of a non-clogging inlet distribution system and two layers of non-clogging fixed, modular media. It should be noted that the biogas is treated with aerated, sulfide-free wastewater within the scrubbing tower.
Usually, such a “solution” from the aeration tank of an air treatment system is applied as the scrubbing liquid because the activated sludge is regarded as perfect as the air treatment liquid thanks to its generally high pH and associated buffer capacity. Herewith, 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 thing is that in a single-stage scrubber, its performance significantly depends on the construction height of the desulfurization tower. Two-stage wet air scrubbers are also possible to produce, and 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, wherefrom the treatment solution passes to provide a gravity return of the “spent” scrubbing liquid to the aerobic system. Herewith, it is real to create models of scrubber systems with a built-in water reservoir and pumped recirculation loop in the case if it is not possible.
Finally, the pressure loss of wet air scrubbers is low leading to generally no biogas blowers are required. Modern scrubbing systems provide 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.
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 firstname.lastname@example.org