The decline of surface water sources along with periodic droughts has introduced new challenges for the state of California. In order to keep up with the increasing demand for water, the state is heavily relying on imported water from the north to Southern California as well as importing water from the Colorado River. The imported water has a large carbon footprint due to using grid power for water transport. Water reuse (reclaimed) is considered as one of the solutions to reduce the dependency of state on imported water. The research team at Cal Poly Pomona, is developing an off-grid solar-powered greywater treatment system for non-potable use in single households. Greywater is the drained water from bathroom sinks, showers, tubs, and washing machines; not including 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 developed system is comprised of a three-stage treatment train: micro-filtration, solar-driven reverse osmosis, and ultraviolet disinfection. The end product of the project is capable of reclaiming 90-100 gallons of water per day which is about 60% of residential greywater waste. The system removes large suspended particles (particles of dirt, food, etc.) as well as organic and inorganic dissolved contaminants. It is demonstrated that the system can provide a permeate quality that agrees with recommended guidelines for reclaimed water. The system has a recovery rate of up to 62%.
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机译：地表水源随着周期性干旱的衰落引起了加利福尼亚州的新挑战。为了跟上对水需求不断增加，国家严重依赖于北加州的进口水以及从科罗拉多河进口水。由于使用电网供电，进口水具有很大的碳足迹。水再利用（回收）被认为是降低国家对进口水依赖性的解决方案之一。 Cal Poly Pomona的研究团队正在开发一个用于单户家庭的非饮用用途的离网太阳能灰水处理系统。灰水是浴室水槽，淋浴，浴缸和洗衣机排出的水;不包括厕所或厨房水槽的废水。治疗灰水在现场可以提供显着的水资源，并且可以使用太阳能电池板减少脱盐的碳足迹。开发系统由三级治疗列车组成：微过滤，太阳能驱动的反渗透和紫外线消毒。该项目的最终产品能够每天回收90-100加仑的水，约占住宅灰水浪费的60％。该系统去除大型悬浮颗粒（污垢，食物等）以及有机和无机溶解污染物。结果表明，该系统可以提供渗透质量，同意推荐的再生水的准则。该系统的恢复率高达62％。
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