Papier- & Zellulose-Industrie / Paper & Pulp Industry

   Paper and pulp industry

Wastewater quality and process concepts

Paper and pulp manufacture requires substantial quantities of fresh water for the production processes; depending on the size of the business, this water can cause correspondingly large quantities of cost-intensive wastewater to be produced. The wastewater produced in the production of paper mainly contains organic substances (COD/BOD5) and calcium, sulphate and chloride loads. The nutrients nitrate and phosphate are largely lacking and have to be added for functioning biological wastewater treatment. The organic substances in the wastewater are readily biologically degradable.

Wastewater treatment requirements vary depending on the size of the business and the wastewater quantity. In most cases amulti-stage biological process, consisting of an anaerobic or aerobic high-load stage and aweak-load stage, preferably implemented after the activated sludge process, has proven successful for direct discharge. In Germany the minimum requirements of the wastewater regulations (Abwasserverordnung – AbwV) Annex 28 (production of paper and cardboard) must be complied with for direct discharge of the treated wastewater into a receiving water.

The following process steps are used generally for direct treatment of wastewater from the paper and pulp industry:

Process steps:

  • Mechanical wastewater pretreatment
  • Flotation
  • Storage and homogenisation
  • Neutralisation
  • Biological treatment
    • Anaerobic wastewater treatment
    • Aerobic wastewater treatment (SBR/MBR plants)
  • Nutrient metering (nitrate, phosphate)
  • Calcium elimination
  • Sludge treatment and energy generation from biogas
  • Exhaust air treatment
  • Automation (EI&C technology, process and remote monitoring, etc.)

We offer turnkey, integrated solutions and individual concepts for water and wastewater treatment in the paper and pulp industry.

The optimum process technology is selected, taking into consideration the operational requirements, the need to minimise disposal quantities and energy consumption and/or to generate energy. This technology can be used for the respective wastewater composition and results in the required discharge limits.

We unite all technical know-how required to implement technical industrial water treatment tasks. From individual consulting, development, to production, installation, commissioning, through to maintenance/service and optimisation, we work with strong partners.

Range of products:

  • Filter screens
  • Mixing and equalising reservoirs/neutralisation
  • Flotation plants
  • Sedimentation basins/buffer basins
  • Anaerobic wastewater treatment
  • Energy generation from biogas
  • Aerobic biological wastewater treatment (incl. nitrification and denitrification)
  • Nutrient metering (nitrate, phosphate)
  • Calcium elimination
  • Chemical dosing and storage
  • Sludge treatment
    • Sludge dewatering
    • Sludge thickening
    • Sludge drying