Treatment of municipal waste sludges

Details Treatment of municipal waste sludges Treatment of municipal waste sludges

1975-11-03

1977-06-07

Spear, Jr., Frank A.

Liquid purification or separation

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

Responsive to fluid flow

210 10, 210 67, C02C 300

Patent

active

040282384

ABSTRACT:
A highly concentrated municipal waste sludge is recovered in a process which involves adding alum and a flocculating agent under alkaline conditions to a dilute waste sludge, adding calcium oxide or hydroxide and filtering the resultant mixture under pressure.

REFERENCES:
patent: 3171801 (1965-03-01), Rice et al.
patent: 3300407 (1967-01-01), Priesing et al.
patent: 3440166 (1969-04-01), Davis et al.
patent: 3472767 (1969-10-01), Lees
patent: 3623975 (1971-11-01), Cardinal, Jr.
patent: 3642619 (1972-02-01), Lo Sasso et al.
patent: 3997438 (1976-12-01), Weiland et al.

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