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DE2733138A1
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Sewage treatment system - has anti:turbulence space between aeration and reclarification basins, requires less floor-space
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DE2733139A1
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Biological sewage treatment - in final clarification basin subdivided in eight funnels inside aeration basin
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DE2418179A1
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Sewage purification plant with partial agitation and aeration - combining vertical flow settling tank with denitrification and flocculation
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DE2330418A1
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Floating swimming pool cover - has tubing on three sides, filled with air or water, and has connecting hose which can be wound on cylindrical drum
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DE1658127A1
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Activated sludge system with a centrally arranged round basin, an aeration basin surrounding the round basin and a rapidly rotating bridge
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