TANYTARSUS

The soft technology for healthy lakes and rivers.

Aim

Method

Air or pure oxygen is conducted through small, flexible pipes from a land-base to the water. For both air and oxygen the same system is applied.

Mixing

During winter the cool water tends to mix naturally. This phenomenon is supported by injecting pressurized air to the lake bottom so that the oxygen-deficient water thus reaches the surface and absorbs oxygen from the air.

Other implementations are e.g.: summer destratification, mixing to control algal growth, mixing below an ice cover.

The lack of oxygen is often to be found in the lake-bed area while the oxygen content is sufficient in the hypolimnion of a thermally stratified lake (summer or under ice cover). In this case the TANYTARSUS  System is run in a way, that the mixing does not reach the metalimnion and a redistribution of oxygen in the hypolimnion is taking place without interfering with the stratification.

Oxygen input

Oxygen deficiency in the hypolimnion of a thermally stratified lake (summer or under ice-cover) is compensated by leading in air or pure oxygen in form of small bubbles which dissolve while ascending in the lower hypolimnion. So no lack of oxygen (due to increased demand) develops near the sediment.

Alternation in using the described running modes and combinations of them lead to an even greater flexibility and adaptation to nature.

Basic principles

- Optimal involvement of the environment in the restoration process

- Support of natural phenomena

- Maximum flexibility

- Soft and environmentally friendly technology

- No disturbance of the landscape and no construction on the water surface

- All mechanical parts are on land

Limitations

There are few technical limitations. Equipment can be installed in shallow water (i.e. a few meters) or in several hundred meters depth. At present the largest existing plant is installed in a lake with a water surface area of 14.4 km², a water volume of 0.68 km³ and a maximum depth of 87 m. Installations for lakes of surface areas of more than 500 km² as well as for lakes smaller than 0.03 km² have been projected.

Cost

The investment is relatively small as no major equipment is necessary. The running costs are comparatively low and even decrease with the improvement of the water quality.

Experiences

Since 1982 research, design and managing experiences have improved.

Realization

For the most part, the construction of the plant can be executed by local companies, supported by our know-how. We also offer a general contractor agreement with a turn-key installation including all services like data collection, lake model (computer simulation), impact study, expertise, forecasts and design.