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PL276151A1
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Method of aerating liquids and apparatus therefor
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Mechanical aerator for liquids
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Diffuser housing
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Biological treatment plant
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Method of making porous bodies for fine-bubble aeration of liquids
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PL270726A1
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Rotodynamic apparatus for moving and mixing liquids
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Self-contained sewage treatment apparatus "biopact"
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Self-contained sewage pretreating and pumping apparatus "pompact"
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Method of making useful tarry lead bearing muds
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Method of deemulsifying and pretreating used cutting fluids and apparatus therefor
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PL255869A1
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Vortex type mixing apparatus for equalization of aggressive industrial wastes
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Apparatus for entrapping and removing floating impurities form open hydrotechnical channels
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Combined multi-function apparatus for biological sewage treatment
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Method of and apparatus for making sub-bottom water intakes in small and medium-size rivers in particular under unfavourable geological conditions
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Heat exchanger
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PL244125A1
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Installation for compositing of wastes
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PL242103A2
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Spiral settling tank
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Apparatus for electrochemical decomposition of water-in-oil emulsion
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PL232701A1
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Water and sewage treatment method and apparatus therefor
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