Accurate Carbon Addition for Effective Water Treatment

Powdered activated carbon is widely used in water and wastewater treatment to adsorb colour, odour, organic compounds and selected micropollutants. Its effectiveness depends not only on the properties of the carbon itself, but also on how accurately and consistently it is introduced into the treatment process. PAC is a demanding powder to handle. Its low bulk density, very fine particle size and strong dusting tendency require careful attention from raw-material intake through to the dosing point. VOLDE develops integrated PAC handling systems that connect big bag or silo storage with the treatment process through an enclosed material path. The system is configured according to consumption rate, dosing range, plant layout and the required point of addition.

| PAC Intake, Storage & Feeding

For plants supplied in big bags, PAC is introduced through an enclosed unloading station and transferred either to an intermediate hopper or directly to the dosing section. In higher-consumption applications, bulk silo storage can be used to reduce repeated bag handling and create a larger raw-material buffer.

Reliable material discharge is particularly important with activated carbon. Storage geometry, flow-assist equipment and local filtration are selected according to the powder characteristics so that the feeder receives a stable and predictable material supply.

Depending on the application, the system may include:

• enclosed big bag unloading with local dust extraction
• intermediate hopper or bulk silo storage
• volumetric or gravimetric PAC feeding

The final dosing equipment is selected according to the required kg/h range and process accuracy, allowing the material to be introduced into the treatment line in a controlled manner.

| Process-Linked PAC Dosing

PAC demand can change with water flow, contaminant loading and the treatment objective. For this reason, the dosing system should respond to process conditions rather than operate permanently at a fixed output.

VOLDE can link the feeder set point directly to plant process data. The required PAC rate is then adjusted according to the operating condition, while target dosage, actual feed rate and material consumption are monitored through the PLC/SCADA system.

Typical control functions can include:

• dosage adjustment according to flow or process set point
• target and actual feed-rate monitoring
• PAC consumption and operating-status tracking

Where several treatment lines or injection points are present, material routing can also be incorporated into the automation structure.

| Fine Powder. Precise Addition. Enclosed Handling

With powdered activated carbon, dosing accuracy and powder handling are part of the same process. VOLDE approaches the complete material path — from big bag or silo to the injection point — as one integrated system, combining reliable discharge, accurate feeding and enclosed transfer.

| Dust Safety System Design

Powdered activated carbon may present combustible-dust hazards depending on product characteristics and operating conditions. For this reason, the safety concept is defined according to the actual material and the project risk assessment.

Where required, the system can incorporate.

• ATEX-rated electrical equipment
• grounding and equipotential bonding
• explosion protection and local dust extraction

These measures are integrated into the handling concept from the beginning, so storage, transfer and dosing are engineered within the same safety strategy.

The result is a PAC handling system developed around both treatment performance and the practical requirements of managing a very fine, dust-prone powder.