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US 4,253,956 AGranted
Apparatus for the anaerobic purification of waste water
AssigneeN.V. Centrale Suiker Maatschappij
InventorKees C. Pette
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AssigneeN.V. Centrale Suiker Maatschappij
InventorKees C. Pette
Estimating the term…
In apparatus for the anaerobic purification of waste water the invention aims at improving the structure and the operation. In known apparatus of this kind there is a reactor tank with one or more aftersettling compartments in the upper part thereof, with inlet and outlet openings for water and sludge into and from the aftersettling compartments from and into the reactor tank respectively. Such apparatus is improved according to the invention be interrupted inclined walls of the aftersettling compartments to form such inlet openings, the wall parts thus formed being staggered at the inlet openings to screen them from rising gas so that this cannot enter the aftersettling compartments, by one such inclined wall extending downwardly past the opposite one to form an outlet opening for the aftersettling compartments screened against the entry of gas into them, by simple gas collecting hoods, a sludge discharge pipe below the level of the water in such compartments and by removable aftersettling compartments easily replaceable and loosely supported on supporting edges of the reactor tank.
In an apparatus for the anaerobic purification of waste water (sewage or industrial waste) with a reactor tank for methane fermentation and an aftersettling (clarification) compartment in the upper part of the reactor tank, said aftersettling compartment having a discharge opening in the lower part towards the reactor tank so that active anaerobic sludge separated in the aftersettling compartment is allowed to flow back to the reactor tank, and an entry opening in a higher zone, through which the mixture of said sludge and water is allowed to flow from the reactor tank into the aftersettling compartment, with means to separate the generated gas flowing upwards from the mixture of sludge and water before this mixture flows into the aftersettling compartment, the improvement comprising an interruption in the inclined wall of said after setting compartment forming said entry opening, the parts to both sides of the interruption being at a distance from each other as measured from the lower point of the wall part above the interruption in a direction perpendicular to the wall part below the interruption said distance being sufficient, so that the opening is screened from gas rising in the reactor tank while allowing the mixture of sludge and water to flow into the aftersettling compartment, the lower part of the said wall below the interruption being at a distance from an opposite wall part of the aftersettling compartment to form together therewith the said lower discharge opening.
Dependencies are inferred from the claim text.