Method and apparatus for controlling the coagulant dosage for wa

Details Method and apparatus for controlling the coagulant dosage for wa Method and apparatus for controlling the coagulant dosage for wa

1988-04-26

1989-08-08

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210743, 210745, 210746, 210 961, 210101, 210105, 210143, 364500, C02F 152

Patent

active

048550612

ABSTRACT:
Apparatus for controlling the coagulant dosage rate includes a charge sensor located adjacent a coagulant pump for measuring the net electrical charge on coagulated water before water treatment and a turbidity meter for measuring the effluent turbidity after water treatment. A programmable controller responds to the output signal of the charge sensor to continuously adjust the dosage rate to maintain a set point of charge value in the coagulated water corresponding to a desired effluent turbidity. To maintain calibration of the charge sensor, the controller is also responsive to the output signal of the turbidity meter to adjust the charge value set point as required so that the it corresponds to a preselected effluent turbidity.

REFERENCES:
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patent: 4282103 (1981-08-01), Fuhr et al.
patent: 4407719 (1983-10-01), Van Gorp
"Cost Saving Instrument Improves Water Quality," Water/Engineering & Management Magazine, Dec. 1985.
Gerdes, "Why Streaming Current?," the Clarifier, vol. 86, No. 1, Milton Roy Company.
"Coagulation/Flocculation," Introduction to Water Treatment, vol. 2, 1984, American Water Works Association.

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