The Irvine Ranch Water District (IRWD) provides treated potable water, sewage collection and treated 
recycled water to its customers. IRWD has quickly established itself as one of the most diverse membrane operators in the region, with facilities ranging from membrane bioreactors for wastewater reclamation, nanofiltration for groundwater color removal, reverse osmosis for groundwater desalting, and the future usage of microfiltration and ultrafiltration for surface water treatment.
Capacity: 10.4 mgd (7.3 mgd DATS NF, 0.5 mgd CATS NF, 2.6 mgd PTP RO)
Technology: Nanofiltration, Reverse Osmosis
SPI Role:
SPI has provided membrane performance assessment and made recommendations for optimization of IRWD’s DATS and CATS NF trains, as well as their Potable Treatment Plant RO trains. SPI has assisted with identifying and optimizing appropriate cleaning procedures for each facility, and has also worked with IRWD staff to develop and implement a pretreatment chemical procurement process incorporating antiscalant cost and consumption, sulfuric acid consumption, and system recovery.
