The City of Camas in Washington was experiencing complaints of odors coming from one of their pump stations for the wastewater treatment plant. The malodorous air was mainly a result of hydrogen sulfide from the wastewater at the pump station. The city analyzed a number of different technologies that could treat the air, and a dry scrubber was deemed the best option. Specifically, the city was interested in finding the most economical solution to the problem. The air filtration system went to bid with other pump station upgrade projects.