Method for treatment of digester supernatant and other streams i

Details Method for treatment of digester supernatant and other streams i Method for treatment of digester supernatant and other streams i

1975-07-09

1978-02-28

Bascomb, Jr., Wilbur L.

Chemistry: fertilizers

Processes and products

Bacterial

71 12, 71 57, 210 9, 210 10, 210 16, 210 18, 55 70, 423357, C02C 114, C02C 510, C02C 300, C05F 700

Patent

active

040765156

ABSTRACT:
Digester supernatants and/or liquors from sludge dewatering are reacted with an excess of an alkaline reagent having a stronger cation than the ammonium ion and the reaction product is separated into a solution containing aqueous ammonia and solids. The aqueous ammonia derived from the separation stage is heated by free steam under a lowered pressure to free ammonia in gaseous form. The ammonia as a gas, or adsorbed in water, or adsorbed in an acid, or as an acid salt is then mixed with conventionally dried sludge to increase the nitrogen content of the sludge from approximately 1-2 percent to as high as 10 percent.

REFERENCES:
patent: 122773 (1872-01-01), Manning
patent: 546716 (1895-09-01), Shepard
patent: 584908 (1897-06-01), Venuleth
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patent: 2754192 (1956-07-01), Bray
patent: 3345288 (1967-10-01), Sontheimer
patent: 3882019 (1974-05-01), Burke
patent: 3920419 (1975-11-01), Schroeder
Kohl & Riesenfeld, Gas Purification, McGraw-Hill Book Co., Inc., N.Y., 1960, p. 336.

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