Method and apparatus for controlling the coagulant dosage for water treatment
US4855061A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1988 |
| Grant date | Aug 8, 1989 |
| Priority date | — |
| Expiry date | Apr 26, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.