Struvite Reduction via PRI-TECH™

In May 2020, San Antonio Water Systems (SAWS) initiated testing to quantify the impacts and economics of Peroxide Regenerated Iron-Technology (PRI-TECH™) for reducing orthophosphate in the solids dewatering facility at the Steven M Clause Wastewater Treatment Plant (WWTP) for the purpose of struvite reduction.

SAWS implemented a PRI-TECH™ demonstration program with goals of struvite reduction, improved dewatering performance, and polymer reduction. The full-scale PRI-TECH™ trial began in August 2021.

USP installed a hydrogen peroxide storage and feed system at the outlet of the digested sludge holding tank prior to the day tanks and polymer. The ortho-P reduction was analyzed by using the HACH™ TNT method 846 analyzing the filtrate before chemical addition (avg. 130mg/L) and the filtrate from the belt filter presses (61mg/L), a 53% reduction on average at start-up with a dosage of 200-250mg/L of H2O2. Due to lower-than-expected performance, the target peroxide dose rate was increased to 400mg/and resulted in 80% removal of orthophosphate (173mg/L observed in digestate and 29 mg/L observed in filtrate). As a result of operational changes in the day tank levels, it remains difficult to maintain a consistent peroxide dose rate of 400 mg/L. Though struvite formation has ceased, due to the inconsistent dose performance, the anticipated dewatering improvements have not yet been observed.

 

struvite reduction beforestruvite reduction after

 

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Download the Full Struvite Case Study here.

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