The introduction of a new ultraviolet disinfection facility at a St. Joseph, Mo., wastewater treatment plant ensures that up to 54 million gallons of water per day will be 100% clean prior to discharge into the Missouri River. The project was undertaken after it was determined that a bacterial process in place at the plant wasn't completely effective for purposes of disinfection.
An accompanying effluent pump station required excavation depths of 31 ft, prompting development of a dewatering system to prevent settlement and possible collapse of a nearby structure. System components include 70-ft-long sheet piles driven into bedrock and arranged in a circle, a configuration that limits the amount of water entering the excavation zone and requiring extraction.