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Polder sludge draining process renders lagoon fit for agricultural use and water fit for release at low cost
Polder sludge draining process renders lagoon fit for agricultural use and water fit for release at low cost
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机译:der污泥的排放过程使泻湖适合农业使用,而水适合于低成本排放
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摘要
A process de-waters sludge from standing waters especially lagoons. The lagoon sludge is sub-divided into a higher rinse polder zone and a lower rinse polder zone, allowing water to drain steadily from high to low on a quasi-continuous basis, and the steady removal of sludge. Each rinse polder is preferably 10 times longer than its width and has a gradient of preferably 0.5%. Water discharged from the rinse polder is admitted to the lower basin containing especially growing reeds which act as a biological filter. Before final release, treated water is subjected to the natural self-cleaning action of a waterway. Residual water is removed from sludge by wholly or partly covering the sludge with a material having strong suction properties. The suction material may be raised at one end by a post to form a 'sail', allowing the wind and sun to remove the water vapor which rises by capillary action.
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