Meridian, Idaho Wastewater Resource Recovery Facility partners with Centrisys/CNP to implement a MagPrex biological nutrient removal system.
Meridian, Idaho Wastwater Resource Recovery Facility (WWRRF), has chosen to install Centrisys/CNP Corporation’s sequestration process, with the option to expand to struvite harvesting.
Meridian evaluated nutrient management processes that would allow them to meet upcoming lower nutrient effluent limits, concluding that biological phosphorus removal was the best choice. The decision was based on process effectivity, lower lifecycle costs, and meeting chemical reduction goals for their treatment process.
Biological phosphorus removal directs most phosphorus into the solids stream in the form of orthophosphate for further treatment. By concentrating the phosphorus in the solids stream, the city will permanently remove a significant portion of phosphorus from the overall treatment process and prevent recycling within the plant.
Gerhard Forstner, president of CNP and nutrient recovery expert, said: “We had the opportunity to pilot our MagPrex phosphorus removal system at the Meridian WWRRF to prove that the system offers the lowest lifecycle cost to the city. After an evaluation of MagPrex by the city’s engineers, Mountain Water Works and Carollo, the city council decided to award the order to the Centrisys/CNP MagPrex system.”
The city has a compliance schedule to meet a limit of 8.5lbs/d TP, with a projected future maximum month flow to a concentration of 0.07mg/L total P. Instead of using environmentally damaging chemicals, MagPrex will mitigate the high phosphorus levels at the plant with a process for wastewater treatment plant biosolids optimisation and phosphorus recovery.
Meridian’s WWRRF operates and maintains a centralised wastewater treatment facility and over 400 miles of sewer lines located throughout the city. The primary objective of the city’s wastewater division is the protection of the water supply and the processing of wastewater that flows into the facility to safeguard the health of its citizens.
Using the MagPrex system, operations can prevent crystallisation in their biosolids train and reduce phosphate recycling by up to 90%, Centrisys/CNP claimed. As the seventh MagPrex installation in the US for Centrisys/CNP, the Meridian WWRRF’s start-up data’s anticipated timeframe will begin in the summer of 2022.