The Groundwater Replenishment Process
MRWPCA’s treated water would be put through an additional three-step Advanced Water Treatment (AWT) purification process of microfiltration (MF), reverse osmosis (RO), and oxidation with ultra violet light (UV) and hydrogen peroxide (H2O2) — all commonly used in numerous industries and food manufacturing, such as baby food and bottled water. The purified water is near distilled quality and exceeds all drinking water standards.
In Microfiltration (MF) treated wastewater is pushed through a filter with pores 300th the size of a human hair. MF is used regularly to in food manufacturing such as baby food and beer.
The use of reverse osmosis technology (RO) is also quite common. Water is pushed through semi-permeable membranes under high pressure. RO is used to produce bottled drinking water and ultra-clean water for making computer wafers and other hi-tech industries. RO is the standard technology used to remove salts from seawater for human consumption. It is so effective, RO is used on the International Space Stations to make drinking water on space shuttles.
At this stage, the water is already of a high grade water quality. The third stage of the proposed Advanced Water Treatment facility is an insurance step to remove any molecules that may have slipped through. This is done by oxidizing the water with hydrogen peroxide (H2O2) in the presence of ultraviolet light (UV). Together, these break apart any chemical bonds that may be present. This ensures water disinfection and purity.
The resulting purified water would be pH-adjusted and piped to the aquifer recharge area in Seaside where it is planned to be either injected in the upper “vadose” zone of the groundwater or deeper into the aquifer itself. Monitoring tests will determine the best alternatives.
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