Treating Wastewater in the Pulp and Paper Industry

Producing a single metric tonne of paper requires over 17,000 gallons of water. Around 85% of that is used as process water—for disintegrating raw materials, transporting fibers, and forming sheets. The result is a high volume of wastewater loaded with contaminants: effluent solids, sediments, AOX, chlorinated organics, and high COD/BOD levels

This wastewater isn’t just dirty—it’s chemically complex and environmentally risky. Mills must treat it onsite to meet discharge regulations and reduce toxicity. Aerobic biological treatment is the preferred method, despite accounting for over 70% of operating costs. It’s efficient, minimizes sludge, and improves separation of liquids and biosolids.

1. SAFF (Submerged Aerobic Fixed Film)

Fixed media supports biofilm growth, ideal for consistent loads.

2. BAFF (Biological Aerated Flooded Filter)

Flooded media with aeration, good for high organic loads.

3. MBR (Membrane Bio Reactor)

Best for high chemical content and variable demand. Uses submerged membranes for solid-liquid separation, eliminating sedimentation. Operates at higher mixed liquor concentrations, reducing tankage needs and lifecycle costs

Installed two Robox Screw units and cut energy waste by 15–20%. Compact design allowed easy integration and reduced noise pollution