Liquid purification or separation – Flow – fluid pressure or material level – responsive
Patent
1995-12-19
1997-06-24
Reifsnyder, David A.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
210219, 210515, 210519, 210523, 2105321, 422211, 422213, 422216, 422225, B01D 4300, B01D 1200, B01D 2124
Patent
active
056413971
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device for separating inorganic material polluted by organic material from a fluid, especially of sand polluted by organic material in sewage devices, with a circular shaped container, which in its upper region has a feed device for the introduction of the fluid into the container, with an extractor device for the inorganic material positioned in the lower region of the container and with an extractor device to discharge the organic material and the fluid. Especially the material, taken out of a sand trapping device of a sewage treatment plant or taken out of discharge channels when cleaning or taken during the cleaning procedure of streets, contains beside the inorganic material like sand, stones and the like often a substantial amount of organic material. The inorganic material must be cleaned and separated to a certain degree from the organic material in order to deposit it at low costs.
BACKGROUND OF THE INVENTION
A device of the type described above is known from DE 42 24 047 A1. The device comprises a container shaped concentrically to a vertical axis. The container has a feed device positioned in the middle in the upper region. The feed device comprises a spinning chamber, a gravity pipe, and a trumpet-shaped diffusor, thus using the COANDA-effect. The device is used primarily to deposit sand out of a mixture of sand and liquid in a circular settlement tank. The sand depositing in the lower region of the tank depending on the gravity will be extracted by an extractor device designed as a screw conveyor device. The sand, especially out of sewage treatment plants, and the organic material adhere to each other more or less so that a large amount of the organic material is extracted and conveyed with the sand. Very fine distributed organic material only, which is in a suspending or floating state, is extracted via an overflow of the tank and is extracted together with the liquid. From the periodical Korrespondenz Abwasser, 1/94, pages 48 to 53 (Klinger/Barth "Entwicklung einer Sandrecyclinganlage fur Klaranlagen) a plant for recycling sand is known having a number of singular devices connected to each other. Thus, the material to be treated first is introduced into an oscillating screen in order to separate the larger parts. The material, having passed the oscillating screen, together with liquid is introduced into a classification device having an upward flow to separate the organic material from the sand. The introduction occurs via a hydrocyclone into the classification device. Finally, a dewatering screen with an excentrical drive is used. This effort of devices, tubes and pipes may be justified for complex separation purposes. For the separation of sand out of sewage treatment plants an effort as low as possible is necessary and an operation at low cost. The known plant is designed for relatively large amounts. It is difficult to use the plant for smaller quantities and/or to operate the plant intermittently. In addition, it is not possible to treat the mixtures of sand and liquid typical for sewage plants.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a device of the type mentioned above, with which inorganic sand/liquid mixtures polluted by organic material as known from sewage clarification plants may be cleaned in a manner to separate the organic material from the inorganic material to the greatest possible extent so that the organic material may be treated further in a clarification plant and the inorganic material may be recycled or deposited at low cost.
According to the invention this is realized with a device of the type mentioned above, wherein a fluidized sand bed is provided in the lower region of the container in order to separate the organic material from the inorganic material, the fluidized sand bed is kept in motion by an upward flow of liquid distributed via a perforated base, and a by-pass is provided to transfer part of the sand from the fluidized sand bed into the extractor device in the lower regi
REFERENCES:
patent: 3579443 (1971-05-01), Horst
patent: 3940252 (1976-02-01), Reinhardt et al.
"Development of a Sand Recycling Plant for Sewage Treatment Works", H. Klinger, H. Barth, Ludwigsburg, pp. 48, 49, 50, and 53.
Hans Huber GmbH Maschinen-und Anlagenbau
Reifsnyder David A.
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