Liquid purification or separation – Recirculation – From bottom of separator
Patent
1995-08-11
1998-02-24
Wyse, Thomas G.
Liquid purification or separation
Recirculation
From bottom of separator
210208, 210219, 210256, C02F 330, C02F 312
Patent
active
057208760
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a reactor for biological sewage purification with activated sludge comprising an activation space and an upwards funnel shape separation space for fluidized bed filtration, especially suitable for purification of smaller and the smallest individual sources of sewage, e.g. family houses, resp. a colony of family houses, hotels, motels, smaller housing estates and so on.
BACKGROUND OF THE INVENTION
Various systems for biological purification of the biofilter and biodisk type have been used to purify smaller and the smallest individual sewage sources. The purification effectiveness of such a sewage plants doesn't reach the efficiency of the systems of biological purification using activated sludge. However the use of purification with activated sludge for small and the smallest sewage plants is driving at a lot of technical obstacles. It is known, e.g., that the hydraulic load increases with the decreasing capacity of the sewage plant. The biggest hydraulic overload occurs in small domestic sewage plants for family houses, wherein e.g. draining a bath means a short-time hydraulic overload, the intensity of which is higher in order than the whole day's average load.
The irregularity of hydraulic load requires a respective enlargement of the apparatus for purification with activated sludge and hereby also increases its costs. As a consequence of it the costs for small sewage purification plants with activated sludge increase in the hitherto existing types exponentially with the decreasing capacity.
Another disadvantage of the hitherto existing types of plants with activated sludge is also the dependence of the running cost on the size of the plant. Relatively high running cost in small sewage plants are the result of higher specific consumption of electric power and claims to service, especially the transport of excess biological sludge.
These disadvantages of small sewage plants lead to an effort to connect small sewage sources with larger plants, because the running cost for larger plants is lower.
The use of individual small sewage plants is reserved just for cases, where building up a common sewerage is not well-founded in view of economical reasons.
The so called Brown-Water-Concept is economical for purification of small and the smallest individual sewage sources, according to which the purified water from the premises of kitchens, bathrooms and from house washing-machines is repeatedly used for sanitary purposes. The condition for an efficient use of Brown-Water-Concept is besides highly efficient purification of the sewage also its purification directly at the place of the rise, in order to keep the distribution costs at the lowest level. This leads to a need of small and the smallest domestic sewage plants with high claims to the quality of the purified water, of sewage plants of small sizes, easily transportable, with a simple montage and with acceptable relation of prices. Such an apparatus which would fully comply with these conditions is still missing in the market.
The aim of the invention is to create an apparatus which would effectively purify domestic sewage, namely both for little and very little quantities of sewage, which would provide in high quality purified water and would be simple and with an acceptable price.
SUMMARY OF THE INVENTION
The disadvantages of the known solutions are removed by a reactor according to the invention the main of which is that a circulation circuit between the activation space and separation space is created in the reactor, wherein the activation space is partitioned by a partition between the partition wall of the separation space and the casing of the reactor tank, and the separation space is connected with the activation space through a passage formed in the partition wall of the separation space at the bottom thereof and in front of the partition, and a suction inlet of a recirculation set is arranged in the separation space at the bottom thereof, the outlet of the recirculation set mounting in the activation space behi
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Mackrle Svatopluk
Mackrle Vladimir
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