Floc Monitoring
Realtime Monitoring
of Floc Size Distribution
Chemical coagulation and sedimentation are important
processes in water treatment facilities.
If the floc size is too small, the settling efficiency
will decrease, and excessive chemical dosage will cause
increased operating costs.
Floc information is a proactive indicator that can monitor
the settling efficiency of the clarifier, and operators can
reduce operating costs through effective floc management.
The machine vision technology used in FlocFinder reduces
the labor of the operator and converts the floc status into
real-time digital information.
FlocFinder Sensor
- Analysis of 18 floc conditions and temperature using a high-speed camera
- High-speed sensor-type camera that can be submerged in a tank
- Automatic cleaning device for cleaning sensor optics
- Automatic white balance and automatic gain settings
- 4 image display options (raw, data, box, contour)
- Options for image analysis
- Historical data and export Excel data
- Sending video to FlocFinder.Server using streaming
- Communication with HMI and PLC using Modbus server
- PID control value output for coagulant control
- Synchronize and restart field computer time using FlocFinder server
Note) Analysis parameters and device specifications may change depending on the manufacturer's circumstances.
Parameters
| Parameters | Description |
|---|---|
| Number | Number of flocs |
| Mean | Arithmetic mean of flocs size (Size = Max(length, width)) → D[1,0] |
| SquaredMean | Sqrt [ Sum((floc size)^2) / (floc counts) ] → D[2,0] |
| AreaWeightedMean | [ Sum((Floc area)x(Floc size)) / Sum(floc area) ]^ 0.333 |
| Min | Minimum value of flocs size |
| D10 | 10th Percentile in flocs size (Dv0.1) |
| D25 | 25th Percentile in flocs size (Dv0.25) |
| D50 | 50th Percentile in flocs size (Dv0.5) |
| D75 | 75th Percentile in flocs size (Dv0.75) |
| D90 | 90th Percentile in flocs size (Dv0.9) |
| Max | Maximum value of flocs size |
| STDEV | Standard deviation of flocs |
| Span | (D90 - D10) / D50 |
| AreaFraction | Total Floc Area / Screen Area |
| EffectiveSizeRatio | Ratio of flocs that can settle at a water depth of 2m1) |
| Circularity | Average [ 4.0 * 3.14 * (Area of floc) / (Contour perimeter^ 2)) ] |
| PearsonSkew | (Average size of flocs - Mode2)) / STDEV |
| WaterTemperature | Water temperature measured by FlocFinder |
1) Calculate floc settling velocity using Stokes's Law at measured water temperature
2) The most frequently observed value in a data set (mode)