Fiber fractionation involves segregating fibers by length to maximize the capture and reuse of high-value fibers in the paper-making process. Longer fibers are particularly desirable for enhancing product quality. Krofta offers a combined solution of Krofta Spray Filters and Krofta DAF units to achieve this:

• Krofta Spray Filter: Acts as a scalping device, using mesh screens to capture longer fibers while allowing shorter fibers to pass through.
• Krofta DAF: Processes the shorter fibers and Total Suspended Solids (TSS) from the Spray Filter, separating waste fibers and recovering valuable water for reuse. The longer fibers retained by the Spray Filter are redirected back into the paper-making process.

This integrated approach ensures efficient fiber utilization while minimizing waste.

Recovering wood or paper fiber has become a priority for mills aiming to improve profitability and sustainability. Krofta DAF systems, particularly the Krofta Supracell DAF, were designed specifically for fiber recovery applications:

• Widely used in paper mills for recovering fibers from both virgin and recycled sources.
• Ideal for operations such as paper manufacturing and related industries like ceiling tiles, which utilize recycled fibers as raw material.
• The circular design of the Krofta Supracell DAF is recognized for its efficiency, capable of handling cloudy or clear water streams while maximizing fiber recovery.

This technology helps mills reduce material waste, lower operational costs, and contribute to sustainable production practices.

Paper mills, especially in colder climates, are increasingly interested in reusing effluents with elevated water temperatures to conserve energy and reduce costs. A combination of Krofta DAF and Krofta Spray Filters can effectively address this need:

• Krofta DAF: Removes a large percentage of TSS from effluent streams.
• Krofta Spray Filter: Acts as a polishing step to protect spray nozzles from plugging by capturing smaller particles.

This approach enables mills to reuse warm whitewater, reducing energy costs associated with heating process water and supporting sustainable resource management.

For mills relying on surface or groundwater, Krofta DAF systems offer effective solutions for raw water clarification:

• Capable of achieving rapid clarification in just 3-5 minutes, compared to longer settling times required by gravity clarifiers.
• Highly effective in handling seasonal challenges such as algae blooms in surface water sources.
• Reduces dissolved metals like iron, improving water quality and reducing the need for additional chemicals in the papermaking process.

Krofta DAF systems provide compact, space-saving solutions for mills with limited available area.

Whitewater clarification has been a cornerstone application of Krofta DAF technology for over 40 years. The Supracell DAF design, with its large separation area, is particularly suited for this purpose:

• Effectively handles varying solids concentrations in tissue and towel mills by incorporating dual Air Dissolving Tubes (ADTs).
• Equipped with the proprietary Sludge Blanket Controller (SBC) to maximize solids recovery and enhance process efficiency.

Krofta DAF systems provide reliable performance in recovering fibers and clarifying water, ensuring optimal use of resources in whitewater streams.

To explore how Krofta DAF technology can optimize your pulp and paper operations, we invite you to share your specific needs and challenges. Please fill out the form below, and our experts will provide tailored solutions to help you achieve your goals.