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CA1237542A
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Rotary surface aeration device
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CH666020A5
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Surface ventilation circuit and such a waste water ventilation basin.
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CH666627A5
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Gasifier and a wastewater cleaning system provided with such a.
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DE3224015A1
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SURFACE VENTILATION CIRCULAR AND USE THEREOF
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Process for filtering waste water containing activated sludge, device for carrying out the process and use of the process
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CH656604A5
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Process for increasing the oxygen concentration in waste water
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CH655019A5
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Device for circulating and aerating a liquid
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CH633628A5
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Wind and solar power station
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CH630268A5
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Surface ventilator.
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DD128097A5
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Method and device for preparing wet sludge
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PT65832A
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Method for the continuous preparation of separating seal from a cleaner and a device for carrying out said method
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DE2649756A1
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Air intake for sewage aeration tank - by axial water pump feeding several nozzles acting as air injection pumps
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DE2649762A1
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Surface aerator for sewage tanks - with impeller shroud duct turning rising fluid flow ninety degrees outward over surface
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DE2612086A1
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METHOD OF PROCESSING WET SLUDGE AND EQUIPMENT FOR CARRYING OUT THE PROCESS
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DE2559324A1
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METHOD OF PROCESSING WET SLUDGE AND EQUIPMENT FOR CARRYING OUT THE PROCESS
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DE2559162A1
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COMPOSTING PLANT
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DE2559170A1
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SURFACE VENTILATION CYLINDER
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DE2527195A1
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PLANT FOR PROCESSING MUELL AND / OR THICKENED SLUDGE
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US3979294A
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Clarification plant
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DE2500031A1
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Sewage waste biological treatment device - has horizontal rotor with spoked arms to control discharge of solid waste
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