Sludge thickening device

Details Sludge thickening device Sludge thickening device

2005-07-20

2010-11-09

Hruskoci, Peter A (Department: 1797)

Liquid purification or separation

Constituent mixture variation responsive

C073S054280, C073S061410, C210S101000, C210S143000, C210S145000, C210S206000, C210S383000, C210S392000

Reexamination Certificate

active

07828961

ABSTRACT:
A differential rate rotary thickener; a power detector which is disposed in a sludge receiver tank for thickened sludge thickened in the differential rate rotary thickener; a discriminator which receives an electric signal for a thickened sludge concentration (X) detected by the power detector and which calculates and discriminate the data; a first controller which receives an instruction signal being a discriminated result in the discriminator and which operates an outer cylinder driving machine and a screw driving machine; a ratio setter which receives a discriminated signal of the discriminator and which increases or decreases a chemical feed rate (α) of flocculant stepwise; and a second controller which receives an instruction signal from the ratio setter and which operates a flocculant-feeding pump are provided. Thickening of sludge is performed by controlling the chemical feed rate (α), a rotational speed (S) of a screw, and a rotational speed (C) of an outer cylinder screen.

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Australian Office Action of patent family member Australian Patent Application No. 2005330884 (Feb. 4, 2009).
English language Abstract of JP 2004-017014.
English language Abstract of JP 2004-090049.
English language Abstract of JP 10-337598.
English language Abstract of JP 7-136700.
English language Abstract of JP 4-238699.
English language Abstract of JP 2002-239314.
English language Abstract of JP 2001-179492.
English language Abstract of JP 2003-181216.
English language Abstract of JP 2005-138039.
English language Abstract of JP 2005-274250.
English language Abstract of JP 2006-289308.
English language Abstract of JP 5-305253.
English language Abstract of JP 2000-117494.

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