Method and apparatus for controlling throughput in a beltpress

Details Method and apparatus for controlling throughput in a beltpress Method and apparatus for controlling throughput in a beltpress

1991-01-31

1992-07-28

Therkorn, Ernest G.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210739, 210745, 210746, 210783, 210 961, 210105, 210206, 210386, 210401, C02F 152, C02F 1114, B01D 3703, B01D 3704

Patent

active

051338726

ABSTRACT:
A beltpress controller performs on-line measurements of output sludge cake thickness. A controller takes a product of the measured cake thickness with belt speed, moisture content and belt width to determine a rate of dry solid output per unit time. The calculated rate is compared with a desired rate and the sludge flow rate is adjusted by adjusting the speed of a sludge feed pump to obtain the desired dry solid output rate. In systems which mix polymer with the sludge to increase the dewatering efficiency, the sizing of a mixing orifice through which the sludge and polymer is provided is adjusted to maintain a substantially constant mixing energy. This prevents errors in the streaming current detector which measures the amount of excess polymer in the filtrate and the controller adjusts the speed of a polymer dosing pump accordingly.

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