Project Images
dallman wastewater
Project Summary
Hanson provided engineering related to the design and construction of improvements to the treatment and disposal of the flue gas desulfurization (FGD) effluent at the City Water, Light and Power (CWLP) Dallman Station in Springfield, Illinois.
Hanson developed a predesign report that included all aspects of water operations at the Unit 4 Power Plant, including the development of a water balance for the system. With the removal of units 31, 32 and 33 from generation, the production of sludge and the water processing needs were dramatically reduced. To address the situation, Hanson evaluated the volume of water from the Unit 4 operations and the concentrations of the source flows that would eventually be combined into the newly designed lime sludge treatment facility.
During the data-gathering phase of the project, Hanson conducted on-site flow testing of several force mains and one gravity sewer to confirm water-balance calculations. This site data was compared against known flow meters at the plant, and historical data during Unit 4 operations was used to develop rating tables for water usage at varying operation capacities. This provided CWLP with a blueprint for the future water usage and wastewater anticipated from Unit 4. A key element was the FGD wastewater treatment plant and the sludge blowdown produced from the gypsum production process.
Hanson’s design modified the existing plant, including construction and the installation of new equipment and systems to treat and process FGD sludge and blowdown.