Aerobic sewerage digestion process (42 C. process)

Details Aerobic sewerage digestion process (42 C. process) Aerobic sewerage digestion process (42 C. process)

1975-08-21

1977-05-31

Spear, Jr., Frank A.

Liquid purification or separation

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

Responsive to fluid flow

210 15, C02C 114

Patent

active

040267938

ABSTRACT:
An aerobic digestion process for reducing the solids content of an aqueous biodegradable organic sludge includes the steps of (a) introducing the sewage sludge into a vessel, the initial concentration of the total volatile organic solid in the sludge being less than about 2.5% by weight based on the total sludge present in the vessel, (b) maintaining the total volatile solids concentration at less than about 2.5% by weight; and (c) maintaining the temperature of the sludge in the vessel within the range of from about 38.degree. to about 46.degree. C. By processing the sludge according to the foregoing steps, including temperature maintenance within the foregoing critical limits and maintaining the total volatile solids concentration below the critical limit of about 2.5% by weight, the solids concentration of a sludge, such as a waste-activated sewage sludge, can be significantly reduced in a time period on the order of about three days. In addition to the above process parameters, it is preferred that the concentration of dissolved oxygen in the sludge be maintained at a level greater than about 3 milligrams per liter (mg/l). The waste material produced from the foregoing process exhibits a volatile solids reduction on the order of 50% to 60%.

REFERENCES:
patent: 2875151 (1959-02-01), Davidson
patent: 3025151 (1962-03-01), Berg et al.
patent: 3337448 (1967-08-01), Rich
patent: 3607737 (1971-09-01), Gamer
patent: 3715304 (1973-02-01), Hefermehl
patent: 3730883 (1973-05-01), Lefrancois
patent: 3892660 (1975-07-01), Romell

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