WASTEWATER TREATMENT

The aim of wastewater treatment is to remove the wastewater constituents and restore the natural water quality. According to § 57 WHG, wastewater must be treated according to the state of the art before being discharged into a body of water (direct discharge). The minimum requirements are specified for certain industrial sectors in the Wastewater Ordinance. The discharge into public wastewater facilities (indirect discharge) is governed by § 58 WHG.

Wastewater treatment is carried out centrally in wastewater treatment plants or previously in decentralised oil separators. A distinction is made between mechanical/physical, biological and chemical cleaning processes. Water that has been used for washing cars or may be contaminated with light liquids (e.g. from a petrol station) must be pre-treated in a separator system before being discharged into the sewer. In addition to treatment in technical sewage treatment plants, wastewater can, under certain circumstances, also be infiltrated into drainage fields, deposited in swales or discharged into wastewater ponds and constructed wetlands.

Wastewater outside the sewer catchment area is treated in small wastewater treatment plants. A distinction is made here between outdated systems without wastewater aeration (DIN 4261 Part 1) and the small wastewater treatment plants with aerated treatment stage required today (DIN 4261 Part 2). On the way from the (indirect) discharger to the wastewater treatment plant, processes take place that change the wastewater. This can lead to the formation of odorous and hazardous substances, such as toxic hydrogen sulphide (H2S), which not only has a negative impact on the wastewater treatment process, but is also largely the cause of unpleasant odours (smells like rotten eggs), poses a danger to humans (H2S is a nerve gas that is lethal even in low concentrations, causing death in a few moments at 1000 ppm[1]) and causes the destruction of wastewater structures and facilities.
These processes can be contained or controlled by taking appropriate measures, such as inter-stage wastewater treatment in drainage systems.
Wastewater produced in water treatment plants is increasingly being recycled in these plants. This increases the net yield of pure water and reduces the amount of residual wastewater to be discharged. Als Beispiel wird hierfür die Spülabwasseraufbereitung in Aufbereitungsanlagen für Trink– und Badewasser angeführt. In areas with water shortages, the partial recycling and reuse of reclaimed wastewater is also economical. However, only the flow and residual wash water quantities that have a lower or the same salt content as the raw water are suitable for this.

As you can see, we deal very intensively with the requirements and problems that our customers face on a daily basis. A large number of companies in special-purpose wastewater disposal organisations trust our quality product solutions in practice. Contact us with your individual requirements for applications in your systems. We will work with you to develop efficient solutions to further reduce the burden on our environment and make your production more efficient and effective.