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Recycling Treated Municipal Wastewater for Industrial Water Use

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Secondary<br />

Treatment<br />

Assumptions<br />

Suspended,<br />

Colloidal &<br />

Dissolved<br />

Solids<br />

Removal<br />

Residual<br />

Suspended<br />

Solids<br />

Removal<br />

Residual<br />

Colloidal<br />

Solids<br />

Removal<br />

Residual<br />

Dissolved<br />

Solids<br />

Removal<br />

Residual and<br />

Specific Trace<br />

Constituent<br />

Removal<br />

Disinfection<br />

Adapted from Metcalf & Eddy, 2007<br />

Conventional Secondary Treatment<br />

Facility with Nutrient Removal<br />

(Base WWTP)<br />

Microfiltration Depth<br />

Filtration<br />

Coagulation/Flocculation/<br />

Sedimentation<br />

Surface<br />

Filtration<br />

Microfiltration Ultrafiltration<br />

Membrane Secondary Treatment<br />

Facility with Nutrient Removal<br />

Dissolved Air<br />

Flotation<br />

Nanofiltration Reverse Osmosis Electrodialysis<br />

Ion Exchange Carbon Adsorption Advanced Oxidation*<br />

Chlorination Ultraviolet Radiation* Ozone<br />

Residual Disinfection<br />

<strong>Water</strong> to Reuse Customer<br />

*UV can precede reverse osmosis;<br />

one advanced oxidation process<br />

is UV and hydrogen peroxide;<br />

cost model <strong>for</strong> study is based on<br />

Tertiary 3 water with UV only<br />

Figure D-7g. Tertiary 4 – Advanced with UV Treatment Train as Basis of Cost

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