DULCOPAC is a PAC slurry preparation system designed to remove micropollutants
TOMAL AB is a subsidiary of ProMinent, specialised in metering solid products in powder form. TOMAL AB developed the DULCOPAC system.
Man-made trace substances or micro-pollutants are substances which don’t break down easily, such as the remains of medicines, plant protection agents or industrial chemicals like e.g. PFAS.
Conventional wastewater treatment cannot adequately remove these trace substances fom wastewater. So, they build up in watercourses and natural environments, where they cause a toxic or hormonal imbalance, thereby threatening ecosystems. The metering of powdered activated carbon (PAC) in the last stage of municipal wastewater treatment systems has proven effective at eliminating such micro-pollutants.
Tomal offers several systems for dosing PAC depending on the facility and need:
- The quantity of water that needs to be treated
- The type of installation available
- The degree of precision required
- The degree of automation required
We can adapt our systems with the following combinations:
- PAC metered from a Big-Bag, for limited consumptions
- PAC metered from a Silo, for larger consumptions
- Volumetric dosing that offers a precision of 1-2%
- Gravimetric dosing for advanced precision (down to 0.2%) and exact recording of the quantity of PAC
Your benefits
- Accurate slurry preparation with constant concentration
- Dust free operation
- Turnkey-system incl. storage silo up to 200 m³
- Arch-breaking system for minimal risk of fluidization
- Dual silo emptying for full redundancy
- Modular system with dosing rate 4 - 400 kg PAC/h
Technical Details
DULCOPAC consists of a gravimetric feeding system mounted under a storage silo. The PAC is fed gravimetrically into a wetting cone where it is mixed with water and conveyed to a buffer tank from which the slurry is pumped to the dosing points.
Function
- At low level, the weighing hopper is refilled with PAC from the storage silo with the discharge screw. Eventual arch buildings will be broken by Tomal arch-breaking system.
- A shut-off valve prevents additional PAC from falling into the hopper after stop of the discharge screw.
- The unique Tomal multicrew feeder feeds PAC into the wetting cone. The Tomal feeder, in combination with a gravimetric loss-in- weight system guarantees an optimal feeding accuracy.
- In the wetting cone the PAC is entirely wetted, in a controlled manner, with minimal amount of dilution water. The water flow is measured with a flow meter and the adequate amount of PAC is added, regulated by the loss-in-weight-system, to obtain a constant slurry concentration.
- The slurry created is further conveyed with a water eductor to a buffer tank.
- Finally, the slurry is pumped in a recirculation pipe to multiple injection points from where it can be dosed into the water to be treated for micro-pollution. The dosing of slurry is accurately controlled by a flow meter, and a regulating valve mounted on a distribution skid.
- The dosing rate from the system can be controlled based on the water flow into the contact basin.
- The unused slurry is conveyed back to the buffer tank in the recirculation pipe, The continuous recirculation ensures that the slurry is in constant motion to minimize the risk of sedimentation.
- The system can be delivered in single or dual design. The silo can be mounted at distance from the distribution skid. The system can generally be adapted to suit specific customer requests.
- Turnkey delivery from ProMinent including control cabinet with electrical installation, erection, and commissioning.
- CE-marking according to the Machine Directive 2014/34/EC.
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