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Recycling Treated Municipal Wastewater for Industrial Water Use

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TM3: Recycled <strong>Wastewater</strong> System Components and Costs<br />

<strong>Recycling</strong> <strong>Treated</strong> <strong>Municipal</strong> <strong>Wastewater</strong> <strong>for</strong> <strong>Industrial</strong> <strong>Water</strong> <strong>Use</strong><br />

and 3 could provide an adequate supply <strong>for</strong> cooling water, depending on the source<br />

water quality and the cycles of concentration required <strong>for</strong> the cooling water system. It<br />

is also possible that the base reclaimed supply with or without filtration could meet<br />

cooling water requirements if the industry uses chemicals to keep the water in the<br />

right ionic balance to prevent scaling. Potable supplies with medium to high hardness<br />

are often treated with scalants <strong>for</strong> use as cooling water. The generally high hardness<br />

and high salt concentrations in Minnesota waters and wastewater make it plausible<br />

that Tertiary 1 and 3 level water may be required <strong>for</strong> recirculating cooling water use<br />

in Minnesota.<br />

Table 9. <strong>Water</strong> Quality <strong>for</strong> the Reclaimed <strong>Water</strong> Classifications 1<br />

Constituent Advanced<br />

Secondary<br />

Reclaimed <strong>Water</strong> Concentration 2<br />

Tertiary 1<br />

Conven-<br />

tional<br />

Tertiary 2<br />

Membrane<br />

Filtration<br />

Tertiary 3<br />

Membrane<br />

Softening<br />

Tertiary 4<br />

Advanced<br />

BOD, mg/L 5-10

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