Oral Presentation

Design, and testing of a solar-driven wastewater treatment unit for off-grid applications.

In California the drought has become an important issue due to declines in surface water sources. In order to keep up with the continuously increasing demand for water, the state is heavily relying on imported water from the Colorado River. To account for this problem, the use of recycled water became necessary. The research team at Cal Poly Pomona, with the support of Metropolitan Water District of Southern California, is developing an off-grid solar-powered greywater treatment system for non-potable use in single households. Greywater, by definition, is the drained water from bathroom sinks, showers, tubs, and washing machines; this does not include wastewater from toilets or kitchen sinks. Treating greywater on-site can provide significant water savings, and can reduce the carbon footprint of desalination using solar panels. The system is comprised of a three-stage treatment: three microfilters, three solar-driven reverse osmosis membranes, and an ultraviolet disinfection unit. The product of this project is capable of reclaiming 90 gallons of water per day while recovering approximately 60% of residential greywater. The design of the system will remove traces of organic and inorganic chemicals, and particles of dirt, food and others. The team has built and tested a preliminary design of the greywater treatment system to address the mechanical controls, and electrical aspects of the overall system for future use. Based on data collection and analysis of Version 1, an optimized and more consumer-friendly Version 2 has been built and tested.

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