Abstract
This article discusses a long‐term plan by the city of Richfield, Minnesota, to rehabilitate the plant's treatment process. The project began in 1992 when the in‐house plant personnel removed filter media from a cell, replaced the plant's filter underdrain system and washtroughs, and reinstalled the original filter media. The new underdrain system consisted of precast concrete panels with nozzles equipped for air scouring. It was thought that replacing the filter internals made backwash more effective with the use of air scouring followed by water backwash. However, the results of this process fell short of expectations. The article discusses the reasons for this failure, how a solution was found by dividing the project into two phases that provided a necessary exploratory step to the overall project, and key insights that may be of value to others contemplating plant rehabilitation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
