Tesisat

[Construction – Section 210]

Harrow System:

The harrow system, the sewage through a rake or a drum sieve. In rakes remains rough dirt like toilet papers, pads, condoms, stones, leaves and dead animals depend may be. These materials are coarse to prevent clogging and a better result, removed. These substances from the calculation methods are washed with machines (feces substances and others), pressed, drained, incinerated. They can also be deposited or composted.

A settler removes rough, deductible contaminants from the wastewater (sand, stones, glass splinters or vegetables remains), so that disturbances in the plant could be avoided. A ventilation at the pelvic floor creates an eddy-current. This reduces the density of the waste water and the heavy mineral shares are to be at the pelvic floor. These parts are then eg In road recycled.

The Primary sedimentation basins:

In the primary sedimentation basin are unresolved substances or swim on the surface, (apprpximately 30% of the organic materials). The resulting sludge is concentrated, he sets off and the excess water is removed. The turbidity of water is returned to the wastewater treatment plant and the concentrated sludge is pumped into a tower. There will be an anaerobic treatment. With different plants can be few other procedures.
In the biological stage, then the organic substances in the wastewater by micro-organisms and inorganic substances partially oxidized (oxygen).

In aeration basin by ventilating the wastewater ingredients of the fresh wastewater biotisch oxidative dismantled. Aerobic (oxygen-using) bacteria and other micro-organisms build carbon compounds and carbon dioxide to put it partly to biomass. The nitrogen from organic compounds by bacteria other than ammonia first off, and these are (with oxygen) to nitrate oxidized (the so-called nitrification). Chemical reactions can be takes also place.
It occurs sapropelic mud and combustible digester gas, which is a mixture, which from methane and carbon dioxide. This process is similar to the production of biogas.

The digester gas can be purified in the form of gas in the electricity and heat demand of the plant used. Next, the resulting sludge in agriculture as organic fertilizers can be used. It must, however, be free from harmful substances and poisons. Otherwise, it can be incinerated or disposed of.

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