The EcoRecover process is an intensive (i.e., high areal productivity, small footprint) tertiary nutrient recovery process which leverages the Advanced Biological Nutrient Recovery (ABNR ™ , Clearas Water Recovery Inc.) 24 system. The process consists of a dark mix tank, photobioreactors (PBRs), and the separation of the hydraulic retention time (HRT) and solids residence time (SRT) with membranes (Figure ). The EcoRecover ABNR process was first piloted as a batch system, with minimal monitoring, at the South Davis Sanitary District (South Davis, Utah, USA) beginning in August 2016. In Fall 2021, the first full-scale installation began operation at the Village of Roberts (Wisconsin, USA), with robust monitoring and a design flow of 568 m 3 •day -1 . As of Fall 2023, a 1,100 m 3 •day -1 EcoRecover system has been constructed in Mondovi (Wisconsin, USA) and a 10,600 m 3 •day -1 system is operating in Waupun (Wisconsin, USA). To date, however, there is no fundamental understanding of the mechanisms driving phosphorus removal from wastewater (and recovery in biomass) in the EcoRecover process or publicly available data documenting its performance in real-world conditions. Broad adoption of intensive (i.e., high productivity, small footprint) microalgal treatment technologies requires a mechanistic understanding of factors governing phosphorus recovery across unit operations and over 24-hour cycles to enable transparent process design and control.