Hazen and Sawyer
02/2019 – 07/2020
Water and Sewer,Industrial
W.M. Schlosser was awarded this project in February 2019 to rehabilitate the biofilter cells in Broad Run Water Reclamation Facility (BRWRF) which will include removal and replacement of: the biofilter media, the biofilter precast concrete panels with a fabricated plastic floor system, the spray water system including piping and nozzles, the biofilter airflow meters, the biofilter batten strip system for the covers, repair and coating of the cast in place concrete and other improvements for four (4) Biofilter cells.
The BRWRF was first opened in 2008 and currently treats about 4 million gallons per day (MGD) of sewage with a total current capacity of 11 MGD. Of the 4 MGD that is currently treated, about 1 MGD is distributed back to Loudoun Water customers as reclaimed water. The facility uses preliminary screening/grit removal, primary clarification, fine screening (2 mm), flow equalization, a membrane bioreactor (MBR), activated carbon and UV disinfection. Waste activated sludge (WAS) is centrifuge thickened, combined with primary sludge for stabilization in anaerobic digesters, and centrifuge dewatered prior to land application. Biofilter System is part of the process for environmental protection and water reclamation.
The rehabilitation of 4 biofilter cells Biofilter cell rehabilitation will be done individually as the existing Broad Run Water Reclamation Facility will be maintained in continuous operation during the entire construction period necessary to allow the Owner to continuously operate the treatment facility while providing sufficient and uninterrupted process gas treatment via the biofilter system during the biofilter rehabilitation work. A subsequent biofilter cell will be taken offline until a commissioning of current cell is achieved.