Process for the disposal of sewage

Details Process for the disposal of sewage Process for the disposal of sewage

1973-10-15

1978-02-28

Wyse, Thomas G.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 51, C02C 140

Patent

active

040766209

ABSTRACT:
The process embodying the discovery of the effects of large lime dosages on sewage sludge character consists of: adding lime to raw, sanitary sewage in amounts to exceed a 1:1 weight ratio of lime to COD, or at least 500 ppm lime; immediately treating with carbon dioxide to reduce the pH of the limed sewage mixture to about pH 11; providing a brief period for settling of sludge from the aqueous phase; further adjustment of effluent pH with carbon dioxode to a pH below about 8; discharge of treated effluent water; burning of the sludge to incinerate the organic matter and calcine the calcium carbonate to lime for reuse in the process. This process permits treatment of sanitary sewage in about 30 minutes total as compared to several hours, e.g., 4-8 hours, for other methods of sewage treatment.

REFERENCES:
patent: 486172 (1892-11-01), Wollheim
patent: 2072154 (1937-03-01), Butterfield
patent: 2259717 (1941-10-01), Zentner
patent: 2348123 (1944-05-01), Green et al.
patent: 3386911 (1968-06-01), Albertson
patent: 3455820 (1969-07-01), Joyce et al.
patent: 3546111 (1970-12-01), Busch
patent: 3736254 (1973-05-01), Croom
Mulbarger, M. C., et al., "Lime Clarification, etc.," Jour. WPCF, vol. 41, 12/1969, pp. 2070-2085.

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