Control:
Real-time
optical reading
SADF – Automatic Flocculant Dosing System
Advantage:
Optimised
flocculant dosing
Automation:
Integrated Siemens
S7-1500 PLC
SADF is Tecnoidea’s system for automatically regulating flocculant dosing in real time. Using a fibre-optic reader, the system continuously analyses a sample of turbid water drawn from the clarifier and adjusts the speed of the reagent dosing pumps via their variable-frequency drives. Fully automatic and unattended, it helps reduce flocculant consumption and minimise the risk of overdosing, which can reduce clariflocculation efficiency.
How SADF works
Flocculation is a complex chemical reaction. SADF helps maintain efficient flocculation by automatically regulating flocculant dosing.
The risk of overdosing
When clarifying water containing settleable suspended solids, overdosing flocculant does not improve water clarity; instead, it can re-destabilise the electrical charges of the particles, reducing flocculation efficiency and wasting an expensive reagent.
Sampling
To prevent this, SADF automatically takes a sample of turbid water from the central diffuser of the clarifier. Using a fibre-optic sensor, it assesses floc settling performance by analysing water clarity.
Continuous correction
The system compares the measured settling time with a preset reference value. If the flocs settle too slowly, SADF sends an analogue signal to the variable-frequency drives (inverters) to increase the speed of the dosing pumps and dose more product; if the flocs settle faster than the reference value, the dosing is reduced.
Real-time result
This sampling and correction take place continuously, keeping the flocculation reaction efficient throughout the process.
Technology and construction
Designed for industrial and quarrying plants, SADF combines electronic control with wear-resistant hydraulic components.
Abrasion-resistant pinch valves
The system is fitted with abrasion-resistant pinch valves (normally open) for turbid-water sampling and subsequent cleaning of the sensing unit.
Direct analogue control
SADF sends an analogue signal directly to the variable-frequency drives (inverters) of the dosing pumps, allowing real-time adjustment of dosing-pump speed.
Standard equipment and specifications
Standard equipment and components
- Sensing unit with inclined transparent tube
- Fibre-optic reader for real-time clarity analysis
- Abrasion-resistant pinch valves for sampling and sensing-unit cleaning
- Control panel with Siemens S7-1500 PLC and touchscreen
- Integrated remote-assistance module
- Direct analogue communication with the dosing-pump variable-frequency drives
Technical data (dimensions and protection rating)
Sensing unit
250 × 405 × 615 mm | Weight: 30 kg | Protection: IP55
Control panel
250 × 405 × 615 mm | Weight: 25 kg | Power: 0.3 kW | Protection: IP55
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