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Combined by-pass and/or distribution sediment-thickening unit for sewage purificationplants
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Ventilation pipe for introducing gases into liquids
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Aeration basin for waste water
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Method and apparatus for contacting gases and liquids
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Gas heating furnace with tubular heat exchange means
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Improvements in heat exchangers
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Device in heat exchanger
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Aeration basin for aerating wastewater with activated sludge
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Method and apparatus for heating flowing gases or vapours
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Method of treating fermenting liquids
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Process of and apparatus for the manufacture of yeast
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Apparatus for the fermentation of liquids
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Improvements relating to processes involving intimate contact between a gas and a liquid
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Method of evaporating liquids
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Method of utilizing exhaust gas heat in the manufacture of sulphite cellulose, and of simultaneously recovering sulphurous acid
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Method and apparatus for concentrating briskly foaming solutions
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Means for evaporation
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Evaporation of solutions
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Improvements in and relating to the production of sulphuric acid
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Improvements in methods of and bubbling apparatus for treating liquids with gases
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