Liquid purification or separation – Processes – Separating
Patent
1994-09-09
1996-09-24
Fortuna, Ana
Liquid purification or separation
Processes
Separating
210774, 210180, B01D 3700
Patent
active
055587739
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a plant for processing a slurry and a method for operating the same.
Such plants are used in sludge dewatering engineering, in particular in food engineering and pharmaceutical engineering, but also in the disposal of sewage sludge and the like for separating the solids portion contained in the slurry from the liquid portion.
Corresponding plants are also known which, in addition to a chamber filter press, include a heating unit and a suction or vacuum pump (DE-A-3 901 851, EP-A-0 263 197), but the suction or vacuum pump only serves for removing the filtrate by suction.
In many uses, the filter cake, which forms in the chamber filter press from the suspended matter contained in the slurry, is further processed, in particular, dried. For this it must, in conventional plants, be removed from the filter press and recharged into a drying plant which, if the necessary cleaning operations and the keeping-sterile of the filter cake, generally required principally in the medical sector, are taken into consideration, represents a highly complex operation.
SUMMARY OF THE INVENTION
The object therefore underlying the invention is to provide a design of such plants which permits, with little additional expenditure, a relatively extensive processing of the slurry, and methods for its operation, which offer particular advantages.
The invention, creates a plant in which further processing is possible, in particular, a gentle drying of the filter cake without removal of the same from the chamber filter press. As a result, an extensive processing of the slurry is made possible in a relatively simple plant and the course of the process is made considerably simpler and cheaper. The plant can be constructed to be very compact and can be designed to be mobile.
In plants according to the invention, the circumstance that the filter cake in a chamber filter press is in any case produced so that it offers a large surface area--this is also necessary in the interests of a rapid filtration process--is also utilized in subsequent process steps. Thus, a chamber filter press for treating the filter cake with reduced pressure, down to sustantial vacuum is ultimately suitable, but it is also outstandingly suitable for contact heating of the filter cake. Favorable preconditions likewise prevail for heating by hot gas, since for a fine distribution of the same, the feed line or the filtrate line with their branches or both can be utilized.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following, the invention is described in more detail on the basis of the figures depicting only one embodiment: In the drawings,
FIG. 1 shows a diagrammatic side view of a plant according to the invention,
FIG. 2a shows a diagrammatic plan view of the plant as in FIG. 1,
FIG. 2b shows a plan view corresponding to FIG. 2a, but in which the top machinery is removed,
FIG. 3 shows a diagrammatic longitudinal section through a part of the plant as in FIGS. 1, 2a, 2b,
FIG. 4 shows a diagrammatic representation of the principle of the plant as in FIGS. 1, 2a, 2b,
FIG. 5 shows the change with time of various parameters during filtration and subsequent drying of the filter cake and
FIG. 6 shows the change with time of various parameters during filtration and subsequent freeze-drying of the filter cake.
DETAILED DESCRIPTION
The structure of the plant is described in principle below, with reference in particular to FIG. 4, which shows the machinery with its components and the connections between them in all details, while FIGS. 1, 2a, 2b are intended chiefly to show a possible spatial arrangement of the machinery.
The plant has, in its upper part, a chamber filter press 1 having chamber filter plates 3 suspended on bars 2a,b (FIGS. 1, 2a), which chamber filter plates can be pressed together by a hydraulic unit 4 having a pump 5 and a pressure sensor 6. The filter press 1 is connected via a feed line 7 and a valve 8 to a feed system 9 which includes a stirred tank 10 and, upstream of the stirred tank 10, a floccul
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Aigeldinger Jean-Claude
Hoffmann Egon
Bertrams Dehydrat AG
Fortuna Ana
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