Saving electricity in the wiesentheide clarification plant

Saving electricity in the wiesentheide clarification plant

Klarwarter hugo deppisch led the rate through his kingdom. Like in a whirlpool, the wastewater in the two aeration basins is no longer kept in motion by moving arms, but by an air system at the bottom of the basin. "The oxygen is injected in batches and only as long as necessary, i.E. Until the oxygen saturation is reached. Then the system switches off automatically. That saves an enormous amount of electricity,", he explains. Where previously 600 to 720 kilowatts of electricity were consumed per day, now between 30 and 420 kilowatts are sufficient – an average of just one-third. "That saves 50,000 to 60,000 kilowatts a year", mayor werner knaier had some figures at the ready.

The pipelines for the bubbling were re-laid on short ways, the pipes practically laid as an additional gelander around the basin. The plant received an overall grade of A in the tests, which means that little wastewater tax has to be paid.

The resulting 2500 cubic meters of clear sludge are spread annually in agriculture. Only the meter-long screws, which convey the incoming water with all the waste upwards via the rakes, have to be replaced regularly. "It’s because of all the sand we have in the wastewater", completely deppish. And about the litter, which often ends up in the inflow after the weekend, he argues. "That attracts the rats", he warns his fellow citizens not to dispose of food via the sewer system.

During the last flood, the new system already passed its test of endurance. With 70 liters per second the plant has "zero problems", as the klarwarter proudly proclaimed. If coarse amounts of water arrive, a pre-basin, which is normally empty, is flooded as a buffer. Together with the backwater canal it holds 5000 cubic meters.

Deppisch was also able to answer michael ruckel’s question about how quickly hazardous substances can be stopped after an accident. "We have already had such a case. Within half an hour the plant was sealed, the leaking diesel was stopped in the pre-basin and could be bound."

Nature can also rejoice at the wiesentheider clearing plant. As the last station in the system of the clarification plant, the water runs through a biotope.

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