Housed in the Ingram School of Engineering, the Ikehata lab focuses on the following research areas: - Photobiological Process for Reverse Osmosis Brine Treatment and Minimization
- Ozonation and Advanced Oxidation Processes for Water and Wastewater Treatment and Water Reuse
- Dual-Purpose Facility for Direct Potable Use of Storm Water and Reclaimed Water – Closed Loop Potable Reuse and Beyond “One Water"
- Water and Wastewater Treatment Process Analysis and Optimization – Technology Enhanced Infrastructure (TEI) for Water
Two projects, funded by the Bureau of Reclamation, are currently underway that may impact future reuse projects.
Silica Removal Using Diatom-Based Technology Currently, between 15-20% of water processed by reverse osmosis (RO) technology emerges as a highly saline brine and must be disposed as of waste. The lab is conducting experiments to increase desalination efficiency using diatoms (single-celled photosynthetic microalgae that naturally extract silica from water to construct cell walls) to remove silica so that the brine can undergo a second round of RO desalination. The diatom-based technology uses sunlight so is a greener process than other technologies, and has been demonstrated on a laboratory scale. To further test the effectiveness of diatom removal of silica, the Ikehata lab deployed pilots at San Antonio’s H2Oaks Center (Dec 2021-March 2022) and Orange County Water District’s Groundwater Replenishment Systems, an IPR plant, (June-August 2022) and is waiting for approval for a 3rd pilot test. (This research has also been supported by City of Wichita Falls and El Paso Water). Preliminary experiments have showed a 92-95% overall permeate recovery rate, and further results are expected by the end of summer 2023. The Bureau of Reclamation hopes the pilot data can help determine long-term feasibility and provide the basis for a lifecycle cost analysis. Real-Time Monitoring of Critical Water Quality Parameters Technology Enhanced Infrastructure (TEI) is the theme of Texas State University’s Civil Engineering Program. Smart water approaches are becoming increasingly popular due to their ability to streamline operations and maintenance tasks. To that end, the lab is currently developing novel technologies to monitor critical water quality parameters in real-time to allow for immediate response to process failure and water quality spikes. Last month, the lab deployed a two-gpm pilot advanced water purification system at the City of San Marcos Wastewater Treatment Plant to continuously monitor two disinfection byproducts – N-nitrosodimethylamine (NDMA) and bromate, along with bacteria. The lab is using equipment provided by several Japanese Universities which has been tested in separate locations, but this pilot will test them together. The pilot is expected to run through August 2023. Anyone interested in learning more about these projects can contact Dr. Ikehata at kikehata@txstate.edu.
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