What is Advanced Water Purification?

Advanced Water Purification produces high-quality drinking water using the most advanced treatment processes available. Though technologies can vary, many systems use water purification that includes three processes: microfiltration, reverse osmosis, and ultraviolet light/advanced oxidation.

Advanced Water Purification Process PureWater Soquel from Soquel Creek Water District on Vimeo.

The Purification Processes

1. Microfiltration
The recycled water first goes through microfiltration, an initial filtration process where water is pumped through tubes filled with tiny membranes. Each membrane is made up of hollow fibers, perforated with holes 1/300th the width of a human hair! Solids, bacteria, protozoa, and some viruses are removed from the water as it is drawn through the tubes.

2. Reverse Osmosis
The water then goes through reverse osmosis where it is forced under high pressure through membranes with holes so small that a water molecule is almost the only substance that can pass through. As a result, constituents such as salts, viruses, and most contaminants of emerging concern (e.g. pharmaceuticals, personal care products and pesticides) cannot pass through the membranes and are left behind. This is the same process that is used by some bottled water companies, baby food manufacturers and for kidney dialysis.

3. Ultraviolet Light
Ultraviolet Light (UV) with advanced oxidation is a further safety process where extremely concentrated light, similar to the suns rays, kills any organisms that may remain after reverse osmosis. UV combined with hydrogen peroxide (H2O2)), similar to strong bleach, is an effective disinfection/advanced oxidation process that keeps trace organic compounds from reaching drinking water supplies.

 

 

Membrane Infographics

These infographics illustrate the membrane technology used in advanced water purification and how it functions.  

Infographic 1  - Types of Filtration vs. Relative Size of Common Materials

Infographic 2  - Membrane Separation Performance

Infographic 3  - Typical Removal Rates for Thin-Film Composite Membranes

Infographic 4  - Filtration Types vs. Common Contaminants