Process for sewage treatment with countercurrent heat transfer m

Details Process for sewage treatment with countercurrent heat transfer m Process for sewage treatment with countercurrent heat transfer m

1977-01-24

1978-06-13

Wyse, Thomas G.

Liquid purification or separation

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

Responsive to fluid flow

210 12, 210 16, C02C 106

Patent

active

040947734

ABSTRACT:
Apparatus and method are disclosed for an anaerobic process in three stages having progressively higher temperatures up to 75.degree. C. for digesting raw household sewage with methane forming bacteria, in which dolomite is added to control the pH of the system within the range 6.0-7.5. After a sterilization fourth stage at 82.degree. C. or greater, the effluent is treated in a ground filter. Heat is countercurrently transferred from the sterilization stage effluent to the substrate of the digestion stages. The apparatus for carrying out this process has an underlying heat-exchange compartment and four concentric compartments, of which the innermost is the sterilization stage compartment containing a heating means and the outermost compartments are flow chambers for sequentially digesting the sewage in psychrophilic, mesophilic, and thermophilic stages, prior to sterilizing. The thermophilic stage contains a micron-size filter upon which a bacterial slime forms and which passes a sediment-free, treated effluent. Sterilized effluent from the fourth stage passes through the underlying heat-exchange compartment having the form of a truncated cone for heat exchange to the bottoms of the three concentric flow chambers.

REFERENCES:
patent: 1963581 (1934-06-01), Heukelekian
patent: 2315577 (1943-04-01), Bach
patent: 2430519 (1947-11-01), Mallory
patent: 3395799 (1968-08-01), Kurtz
patent: 3462275 (1969-08-01), Bellamy
patent: 3694353 (1972-09-01), Yong et al.
patent: 3745113 (1973-07-01), Fuchr

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