Pulp and Paper mills are facing demands for higher quality of process water to increase machine speed and improve product quality. At the same time, conversely, mills are under pressure to decrease water consumption and to have more efficient effluent treatment to reduce environmental load to even lower level. For most mills a conventional biological effluent treatment is inadequate to reach the tight effluent concentrations.

EWT’s primary and secondary clarifiers are designed and built with over 50 years of engineering and manufacturing experience and most importantly by using the information attained from hundreds of references in pulp and paper wastewater treatment processes.

One of EWT’s key technologies is FlooBed® MBBR (moving bed biofilm reactor). It is a compact and high loaded system designed for P&P effluent treatment. It can be used for the whole mill effluent treatment as single or multiple stages, or it can be combined with activated sludge process FlooBed® BAS process. FlooBed® can also be constructed into the existing basins and used to upgrade the old activated sludge process. Because of the good sludge quality produced and low free sludge concentration the following clarification can be done with conventional or lamella clarifiers or with microflotation. Because of its compact size it can be built close to the production site and later even integrated into the mill water circuits.

At some production sites requirements for the treated wastewater are so stringent that these cannot be met despite of thorough biological treatment. In these cases EWT can provide an efficient tertiary treatment system.