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DE665947C
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Process for processing waste water containing copper
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DE661078C
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Process for reconditioning used metal stains
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DE660930C
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Process for the cleaning of sulphite waste liquors or waste water containing them
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DE601668C
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Process for maintaining the optimal hydrogen ion concentration for the anaerobic digestion of sewage sludge
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DE557544C
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Agitator to destroy floating sludge in septic tanks
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DE540015C
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Process for increasing the calorific value of digestion gases or similar gases mainly containing methane
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DE561514C
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Process for the treatment of sulphurous iron pickling liquors with the extraction of anhydrous iron sulphate
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DE535252C
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Process for the processing of hydrochloric iron pickling liquors for ferrous sulfate and hydrochloric acid
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DE500058C
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Process for revitalizing reworked, revitalized sludge
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DE492810C
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Process for cleaning waste water with a high iron salt content e.g. B. of gravel pits, wire drawing shops and. like
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DE501580C
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Process for the purification of wastewater with activated sludge
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DE504993C
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Process for the chemical-biological cleaning of waste water
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DE466024C
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Ventilation room for revitalized sludge with settling room
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DE436833C
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Free-floating flow indicator
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DE506337C
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Device for cleaning wastewater with activated sludge
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