Efficient Wastewater Treatment in the Pulp and Paper Industry

February 2021

The enormous demand for brown cardboard and paperboard driven by the increase in sales figures in online trade requires especially coordinated methods and equipment for wastewater treatment. The raw material used to produce brown cardboard and paperboard is the highest possible percentage of recycled waste paper. The fibers recovered during the recycling process attribute to a high input of limescale, fillers and binding agents. Large quantities of organic compounds are discharged with the wastewater from production. A major portion of these organic compounds are already degraded in an anaerobic (without oxygen) process step. Nonetheless, yet another aerobic process step is needed to lower the pollutant loads in the wastewater to a level that allows the treated wastewater to be discharged back into the receiving waters and thus into the environment. 

Challenges of aerobic treatment 

In the aerobic process step, oxygen is transferred to the bacteria by an aeration system, reliably degrading the organic pollutant load. The challenge to overcome in the aerobic step is not only to realize an energy efficient oxygen transfer, but also how to deal with the difficult boundary conditions that arise in the wastewater of a paper mill in particular. 

The HYPERCLASSIC®-Mixing and Aeration System - the energy-efficient, reliable and low-maintenance solution

The HYPERCLASSIC®-Mixing and Aeration System is a mechanical aeration system, which has been in use in industrial wastewater treatment plants for over 20 years. With a unique combination of mixing and aeration system, INVENT provides the solution for the demanding tasks of aerobic wastewater treatment. Especially in the wastewater resulting from paper production, because of the specific characteristics of the components, all of the problems in the aerobic process step are successfully avoided: 

The HYPERCLASSIC®-Mixing and Aeration System also exhibits its high degree of flexibility when integrated into a wastewater treatment plant.

These unique characteristics have made the HYPERCLASSIC®-Mixing and Aeration System the industry standard in the field of aerobic treatment of paper wastewater over the recent decades. No matter whether the largest paper machine in Europe, the most state-of-the-art production plant in Europe or specialist manufacturers, each of them rely on the efficient, reliable and low-maintenance system from INVENT

In 2020, a total of twelve HYPERCLASSIC®-Mixing and Aeration Systems were installed in the Palm GmbH & Co.KG paper mill in Aalen, Germany. Each system distributes up to 1,800 Nm³/h at an injection depth of up to 11.5 m. The overall specification and the selection of materials meet the highest standard for use in the wastewater of a paper factory.

In the video you can see the application in the paper mill Palm GmbH & Co.KG: