June 21, 1961: First Practical Desalination Plant; 1881: Filter Inventions

0621 Seawater desalination plant Freeport TXJune 21, 1961: “President John Kennedy pressed a switch installed in his office in Washington DC to dedicate first practical plant for the conversion of seawater to drinking water; built in less than a year at a cost of $1.5 million at Freeport, Texas by the Dow Chemical Co.; capable of producing about a million gallons of water a day, supplying fresh water to the city of Freeport at a cost of about $1.25 per thousand gallons; May 8, 1961 – Office of Saline Water, U.S. Department of the Interior opened the plant; reverse osmosis has replaced large-scale evaporation method used then as scientific advances have produced special polymers suitable for use as filtering membranes.”

Filter Backwash Process

Filter Backwash Process

June 21, 1881: “Patrick Clark, of Rahway, NJ, received a patent for a ‘Process of Cleaning Filter-Beds;’ “…the novelty of the process consists in the employment of jets of water for the purpose of agitating a bed of sand or other suitable granular material which forms the upper part of the filter bed. By this means the silt and other impurities are separated from the sand, and, being of inferior specific gravity, rise above the filter bed, and are removed preferably by a natural current of water in which, when practicable, the apparatus will be immersed”; assigned to Newark Filtering Company (incorporated by Clark, John W. Hyatt, Albert Westervelt in December 1880); origin of modern rapid filter; June 21, 1881 – John W. Hyatt also received a patent for a “Filter”; could be cleaned mechanically; assigned to Newark Filtering Company; prototype for rapid filtration concept.”

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