Challenge: A private client facility was increasing its production and was having difficulty meeting the total nitrogen limit.
Solution: The HR Green team completed a Facility Plan, plans, specifications, and construction observation for a private facility that had an upcoming production expansion. The design included civil, process, structural, and instrumentation and controls. These improvements included the conversion of existing concrete basins into anoxic zones for denitrification so that new tankage and aeration equipment was not required. The design conditions were a 2.41 MGD flow, 14,000 lbs per day of biochemical oxygen demand, and 5,000 lbs per day of total Kjeldahl nitrogen. This facility is now seeing total nitrogen removal greater than 79%.
The production expansion improvements were developed through a civil engineering approach that also planned for future biological phosphorus removal. These civil engineering recommendations, currently under review, include reusing existing pumps, mixers, and tankage to meet new biological phosphorus removal goals. All plant improvements are being completed within the existing wastewater treatment plant footprint by repurposing current tanks and structures.
Benefit: The private client will be able to avoid building a new WWTP by simply modifying existing structures. Additionally, operational changes were implemented which significantly reduced their annual power costs without reducing treatment effectiveness.
