Biological cleaning

The heart of a sewage plant is the biological cleaning stage. Here, micro organisms are used to brake down the organic substances in the waste water and inorganic substances are partially oxidised. In the so-called aeration basins, the substances are broken down by artificially adding oxygen and mixing this through the waste water. One tried-and-tested technical device for aeration is the detachable KLAWA aeration element.

Drainage control system

For the last 30 years, measuring and control equipment has been used to avoid hydraulic overloads of the downstream constructions. Not only in sewer systems, but also in the waste water equipment sector. There are a number of options here. One proven system is the drainage control system KLAWA which stands out thanks to its simplicity and the composition of the components used to operate the system.

Final sedimentation

After flowing through the aeration basin, the biologically cleaned waste water enters the final sedimentation together with the activated sludge. There are various basin design options here. The task of the final sedimentation is to separate the activated sludge from the water. Deposited sludge is forwarded to the aeration basins via clearing equipment and sent for treatment and disposal.

Mechanical cleaning

Screening units are the oldest cleaning devices in the waste water technology field. As a result, a large number of different types have been developed and discarded over the years. Even today, developments are still being made. A further technical device for mechanical cleaning are the sand washing plants. The waste water is treated to separate the sand from the inflow and to return it to the recycling system. Organic substances are removed from the water. The washed sand falls into the container and is then returned to the recycling system.

Polishing pools / pool clarification plants

Polishing pools are a special type of naturally aerated waste water pools. These are pools into which bio-chemically full cleaned waste water flows; their task is to this waste water , i.e. filter out more sedimentation. Waste water pools and pool clarification plants are not a new invention. They are actually the oldest form of waste water treatment. A differentiation is made between naturally and technically aerated waste water pools.

Pumping station

The screw conveyor is the pump of a balanced pressure lifting device that raises liquids to a certain height by mean of a rotating screw. Thanks to the installed equipment in the pumping station, the material is sent more or less evenly to the downstream sewage plant. Instead of screw conveyors, waste water pumps with the appropriate pipe systems can also be used.

Rain storage reservoir

Rain storage reservoirs serve to temporarily hold back the rain water that has been directed into the canalisation. It relieves the canalisation system in case of heavy rainfall. Frequently there are problems cleaning the reservoir basin and controlling the drainage. This is where KLAWA’s drainage control system KLAWA “light” and the various rinsing cleaning systems come into their own.

Sludge treatment

Often mechanical devices are used to remove water from the sewage sludge so that it can be recycled or disposed. Solid matter levels of approx. 25 - 30% are achieved here. In the case of biological dewatering, e.g. on reed beds, these levels may even reach up to approx. 60%.

The future of the waste water is clear.

Whilst the drinking water lines and the waste water canalisation were often highly developed even centuries ago, there was no necessity to treat the waste water. The self-cleaning powers of the water was all that was required because the population was smaller then and the waste water was less soiled than today. To relieve nature, compact plants for cleaning and treating the water were developed.