EXPERTISE
hydrograv adapt

For many wastewater treatment plants secondary settling tanks are the „problem children“ of the operation, perpetrators of high drainage turbidity and the „bottleneck“ of the hydraulic capacity of the whole wastewater treatment plant.

The hydrograv GmbH was able to demonstrate that cause of all the problems is the fixed design of the inlet structures. It turns out that a fixed structure is almost always with the wrong geometry in the wrong place: in dry weather too high to minimize the turbidity, in rainy weather too low to not whirl up the settled sludge. Therefore, it was clear that the inlet structure must be designed variable, the concept for hydrograv adapt was born.

Picture: Height-variable inlet structure in dry weather (left), rainy weather (center) and heavy rain (right)

Flow simulations of hydrograv to over one hundred secondary settling tanks show that this concept is almost always cheaper for continuous low effluent values, a high load capacity and the avoidance of sludge overflow.

Picture: Look into two secondary settling tanks of a wastewater treatment plant with an old fixed inlet structure (left) and with the hydrograv adapt inlet structure (right). Significantly fewer flocks in plain water!

In the meantime this rugged construction ensures impressive results for several years on a variety of wastewater treatment plants:

  • Discharge values ​​that can usually only be reached with the installation of sand filter systems – at a fraction of the cost, the energy input and the maintenance requirements.
  • Further phosphor elimination goals can be achieved with hydrograv adapt at a fraction of the previously anticipated financial expenses.
  • Hydraulic loads become reliably treatable, which was considered impossible previously.

Some of many examples of these excellent operating results can be found on the following pages. We gladly send you further references. You are welcome to arrange viewing appointments on wastewater treatment plants in your area with already refitted secondary settling tanks with us as well.

With hydrograv adapt the hydrograv GmbH consequently makes a significant contribution to the environmental protection – while protecting the financial resources of the wastewater treatment plant operators.

Picture: Installation of the height-variable inlet structure in the last out of six secondary settling tanks at a large wastewater treatment plant.

The main advantages of the height-variable inlet structure hydrograv adapt at a glance:

  • No more sludge overflow by securing the flock filter effect.
  • Less sludge displacement in rainy weather makes for a higher sludge concentration and thus for better degradation capacity in the activation.
  • A lower sludge level and a stable sludge bed lead to increased operational safety.
  • Minimal particulate phosphor and COD in the effluent. On average and in the tips. I.e. sustainable water protection and conservation of wastewater levy.
  • Flock filter in the secondary clarification instead of the downstream filtration. This minimized investment costs and significant energy savings.
  • Ideal support for elimination removal with activated carbon.
  • More mixed water through the wastewater treatment plant.
  • Expanding without building new secondary settling tanks.

Unlike fixed inlet structures with compromise geometry hydrograv adapt constantly ensures minimum loads in the sequence with maximum load capacity simultaneously. Low-maintenance, durable, successful.

Thus hydrograv adapt defines the state of the art in the equipment of secondary settling tanks.
hydrograv adapt – a patented technology of the hydrograv GmbH.

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