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Globe & bluegill
Date Issued: 1970-10-28
Postage Value: 6 cents

Commemorative issue
Anti-pollution
Globe & bluegill

Primary wastewater treatment removes about 60 percent of suspended solids and 35 percent of biodegradable organic material in municipal sewage and in industrial wastewater. Advanced treatment of waste involving biological, chemical, and physical methods of disposal is used either to remove plant nutrients that promote excessive growth of algae in water or to remove industrial pollutants.

Topic: Fish/Fishing (79)  

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