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DE744825C
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Process for the production of fertilizers
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DE488926C
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Method of mixing fresh sewage sludge with mature digested sludge
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DE484984C
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Device for the treatment of waste water in biological immersion bodies
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DE476068C
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Process and device for the purification of waste water in a settling basin provided with colloid catchers
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DE414169C
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Process for washing out carbonic acid from digester gases within the sludge digester
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DE426766C
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Method and device for the biological purification of waste water with activated sludge in ventilation basins
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DE426429C
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Process for wastewater treatment with activated sludge
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DE418606C
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Process for cleaning wastewater in fish ponds
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DE418319C
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Device for the purification of wastewater with activated sludge, consisting of a ventilation space and an immediately attached clarification basin
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DE413826C
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Process for the purification of sewage with activated sludge and for the digestion of this sludge
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DE411926C
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Process for the production of pure methane from mixed gas
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DE377802C
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Procedure for the incorporation of septic spaces
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DE376697C
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Method for heating sludge digestion rooms
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DE466743C
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Sludge activation system for the purification of wastewater, consisting of ventilation basins and secondary clarification basins
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DE481126C
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Device for cleaning wastewater in a settling basin provided with a colloid catcher
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DE393994C
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Clarification plant with digester and device for discharging gases
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DE381699C
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Process for the decomposition of sewage sludge in sludge rooms separate from the sewage room by mixing the fresh sludge with decaying sludge
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DE381162C
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Process for dewatering sludge with the participation of its gas content
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