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US 4,282,093 AGranted
Apparatus for detecting coagulation effect
AssigneeHitachi, Ltd.
InventorsTeturo Haga, Takashi Ikeguchi
Life of this patent
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AssigneeHitachi, Ltd.
InventorsTeturo Haga, Takashi Ikeguchi
Estimating the term…
In a water purification plant, where a coagulant is dosed into raw water to coagulate turbidity-causing particles suspended in the raw water to form floc, and the water containing the floc is led to a sedimentation basin to separate the floc by sedimentation, thereby purifying the raw water, a coagulation effect is quickly detected by by-passing a portion of the water containing the floc and flowing to the sedimentation basin through a filter column of an apparatus for detecting a coagulation effect, the filter column being filled with a filter layer of filter medium, detecting a filtration pressure at the column side at a specific level of the filter layer at a specific time interval, monitoring a change in a rate of change in the filtration pressures to detect an improper dosage of the coagulant in correlation to the change in the rate of change in the filtration pressure, and outputting an alarm signal to a coagulant dosage control system, when the detected coagulation effect is detected improper.
An apparatus for detecting a coagulation effect in a water purification plant, which comprises means for introducing a dose of a coagulant into raw water to form floc of turbidity-causing suspended particles, a flocculation basin for receiving the raw water containing said coagulant and for allowing growth of said floc, a sedimentation basin for separating the grown floc, means for leading the water containing the grown floc to said sedimentation basin to separate the grown floc by sedimentation, thereby purifying the raw water, means for by-passing a portion of the water containing the grown floc and being led to the sedimentation basin from said flocculation basin through a filter means, said filter means containing a layer of filter medium and having a filtration pressure detection point means at a specific level in the filter medium layer, means for monitoring a rate of change in filter pressure and for detecting an improper dosage of the coagulant into said raw water in correlation to a rate of change in filtration pressure within said filter medium layer and means for signaling an improper dosage of coagulant.
An apparatus for detecting a coagulation effect in a water purification plant, which comprises means for introducing a dose of a coagulant into raw water to form floc of turbidity-causing suspended particles, a flocculation basin for receiving the raw water containing said coagulant and for allowing growth of the floc, a sedimentation basin for separating the grown floc, means for leading the water containing the grown floc to the sedimentation basin to separate the grown floc by sedimentation, thereby purifying the raw water, means for by-passing a portion of the water containing the grown floc and being led to the sedimentation basin from said flocculation basin through a filter means, said filter means having a filter layer of filter medium contained therein and a filtration pressure detection point means at a specific level of the filter layer, a computer means for calculating and monitoring a change in a rate of change in filtration pressures detected by the filtration pressure detection point means at a specific time interval and for detecting a coagulation effect in correlation to said change and means for outputting an alarm signal when a detected dosage value is improper.
Dependencies are inferred from the claim text.