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30 / June 2021 powderbulk.com This method of dust management makes wet scrubbers inherently well-suited for controlling combustible dust. Wet scrubbers are also suitable for managing wet or sticky particulate as well as mixes of particulate and gases and vapors. Wet scrubbers are generally not a good option when dealing with water-reactive dusts, heavy dust loadings, or when you don't have access to proper wastewater treatment solutions. Once you know what type of equipment you need, it's time to choose your dust collector. Dry dust collec- tors include baghouse dust collectors, cartridge dust collectors, fluted-media dust collectors, and cyclone dust collectors. Wet scrubber options include impinge- ment scrubbers, venturis, absorption scrubbers, and wet cyclone scrubbers. For optimal results, all of these options can and should be further customized to meet your specific application's requirements. Other considerations Along with the other items presented in this article, many applications will require additional consider- ations. For example, if your process involves discharging any filtered air back into the atmosphere, then this will most often require you to get a permit from your gov- erning air quality agency. Systems that exhaust air back into the building may require the addition of positive make-up air of equal magnitude to limit excessive nega- tive pressure in the building. Of course, dust management needs can always change as processes evolve, so you should readdress your sys- tems at these times of change and at regular intervals throughout the year. For any air pollution control equip- ment that's used to handle your dust, you'll also want to perform regular maintenance and part changeouts as necessary to keep everything running smoothly. PBE For further reading Find more information on this topic in articles listed under "Dust collection and dust control" in the article archive on PBE's website, www.powderbulk.com. Bill Kurz (bkurz@slyinc.com, 440-274-0390) is the vice president of Sly, where he specializes in field service, troubleshooting, and system design, and has extensive experience in baghouse, cartridge filter, and wet scrub- ber applications. He has nearly 50 years of experience in the air pollution control industry, working with both wet and dry dust collection equipment. Sly Strongsville, OH 866-747-5219 FIGURE 2 A rectangular dry dust collector offers rugged construction and easy installation. FIGURE 3 Operators performing a routine inspection on a wet scrubber.