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Environmental Conservation
New Carbon Filter Cleans Rainwater at Petrol Stations
There are always oil spots near the petrol stations. Rainwater washes them away, polluting the environment. Researchers from Perm have developed a refining unit for cleaning rainwater sewage from petrol stations. It was successfully tested in Moscow and Perm.
The unit base is a new filter – “Kombi” – made of fibrous carbon sorbent, which is produced by coagulation of chemical cellulose fibres in a special way. The filtering process consists of three stages – settling, refinement through the mechanical filter and two-stage sorption extra refinement. At first, rainwater gets into the settling unit – a huge vat, where big insoluble particles of mud settle on the bottom.
The settled water is then refined through the mechanical filter – metal net. It clears the water from smaller particles. After the first two stages the suspension concentration is diminished by one hundred times. Then comes the two-stage refinement. Water gets twice through the “Kombi” filters with carbon fibrous substance, which extracts oil-products out of it. After these three stages the water becomes one and a half thousand times clearer.
The unit takes little place – several square meters. Forty petrol stations in Moscow and two in Perm are already working with the refinement unit.
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