Process Optimization Informs Growth Strategy
Fayetteville Taps Hazen and Sawyer for Studies, Evaluation
(Raleigh, NC – January 5, 2010) – The Public Works Commission (PWC) of the City of Fayetteville, NC has selected Hazen and Sawyer to perform a process evaluation at the Rockfish Creek Water Reclamation Facility (RCWRF). Hazen and Sawyer has provided all of the engineering for this 21-mgd facility over the last decade.
The process evaluation will include an extensive sampling program, followed by development, calibration, and application of a BioWin model to evaluate plant performance at current and future loadings. Increased process loadings at the RCWRF over the last few years, coupled with new regulatory requirements, have made this process evaluation both necessary and timely. In addition to the process evaluation, Hazen and Sawyer will assist the PWC in performing a Reuse Water Feasibility Study.
Hazen and Sawyer’s previous work for the RCWRF has included:
- Design of new chlorination and dechlorination facilities, converting the existing chlorine gas and sulfur dioxide facilities to sodium hypochlorite and sodium bisulfate facilities.
- Design, construction administration, and inspection services for a 16-mgd Phase 1 expansion of the RCWRF, which included a final clarifier, RAS pumping station, two traveling bridge filters, sodium hypochlorite and sodium bisulfite storage and feed facilities, 1.4-MG aerobic digester, and a new 0.7-MG aerated biosolids storage tank.
- Contract administration and inspection services for the 21-mgd Phase 2 expansion, including a 45-mgd screw lift influent pumping station with screening and grit removal, and influent and effluent aeration basin hydraulic improvements.
Hazen and Sawyer had previously been retained to update the PWC’s Rockfish Creek Basin Sanitary Sewer Master Plan for a 20-year planning period. This work involved:
- Short-term basin-wide wastewater flow monitoring program implementation to establish base flows and quantify extraneous flows (Inflow/Infiltration). The program consisted of 22 flow meters and 5 rain gauges spread through the basin.
- Update of population and flow projections for the 20-year planning period in 5-year, 10-year, and 20-year increments.
- Update of the hydraulic model of the Rockfish Creek Basin in H2OMap Sewer software, emphasizing interceptors and trunk mains 10-inch diameter and larger and all lift stations regardless of size. Flow monitoring data collected during the basin-wide wastewater monitoring program were used to calibrate the model.
- Analysis of the collection system capacity utilizing the calibrated model, based on current and future projected flows over the 20-year planning period, along with recommended capital improvement projects resulting from the collection system capacity analysis.
_Since our founding in 1951, Hazen and Sawyer has focused on two things: providing safe drinking water and controlling water pollution. Our range of services encompasses the planning, design, and construction management of water and wastewater-related projects – from clean water treatment, storage, and distribution to wastewater and stormwater collection, treatment, and reuse. _