FI69249C - ADJUSTMENT OF VAT - Google Patents

Description

ADVERTISING PUBLICATION, QO / .Q

Mj B (11) UTLÄGGNINGSSKRIFT 6 9249 CP: -te; 'lti granted «uSJ' 'Patent rr.c l.' EInt 10 01 1086 (51) Kv.ik. 24, 21/00 SUOMI_FINLAND (21) Patent application - Patentansökning 792535 (22) Application date - Ansökningsdag icf) P -ja (Fh '' (23) Start date - Giltighetsdag Qg yg (41) Publication - Blivit offendig ^ g 02 gj

National Board of Patents and Registration of Finland Date of publication, publication and date of publication. -

Patent and registration authorities in the field of public and private use 3O.OS.85 (32) (33) (31) Requested privilege - Priority (71) Required priority Leningrad, USSR (SU) (72) Georgy Andrianovich Romanov, Leningrad,

Gennady Petrovich Kuchin, Leningrad,

Valery Fedorovich Shebechenko, Leningrad,

Serafim Nikolaevich Glyadenov, Leningrad, USSR (SU) (74) Oy Kolster Ab (54) Water clarifier - Anordning för vattenklarning

The present invention relates to an apparatus for purifying sewage and in particular to a water clarifier which can be used in the pulp and paper industry as a means for clarifying effluents containing fibrous matter and mineral matter as a suspension. The device according to the invention comprises a water clarification device comprising a clarification zone and a sludge sealing zone separated by a waterproof partition in the clarification zone and a radial trough connected at one end to a central pipe and at the other end to a water supply cleaning the tank.

Sludge deposition clarifiers are commonly used in pulp and paper mills and sawmills to clarify effluents containing fibrous and mineral particles.

2 69249

The Soviet inventor certificate SV-105409 discloses a clarification device for the treatment of natural water and sewage using a sludge deposit substrate. This clarifier comprises a cylindrical tank comprising a water clarification zone and a sludge condensation zone separated by a waterproof conical plate. At the top of the clarification zone there is a radial trough connected to a central pipe at one end and to a sewage supply line at the other end, said trough acting to supply sewage to the clarification zone. Also fitted to the top of the clarification zone is a system that operates to remove clarified water, and a perforated separator plate is located in the center of the clarification zone along with vertical slurry delivery tubes. The central tube extends through the entire clarification zone and terminates in radial perforated tubes at the bottom of said zone. The sludge compaction zone is provided with an annular torn tube through which water is removed in the presence of a vacuum, a sludge drain tube and a tube for the delivery of the compacted sludge.

During operation, the sewage enters the clarification zone of the clarifier through a radial gutter and through a central pipe, the separation event into a solid and a liquid state takes place in said zone. Excess sludge is removed from the clarification zone to the condensation zone through the sludge delivery pipes, and the clarified water is recycled to the process via a clarified dewatering system.

This water clarifier according to SV Inventor Certificate 105409 only works fully efficient when there is no air in the treated sewage. However, the materials flowing out of the pulp mill have very small air balls which, upon entering the clarification zone, adsorb the suspended particles to their surface. As they rise to the surface, these particles mix with the clarified water, thus impairing the clarification efficiency.

German patent publication DE-946220 discloses a clarification device with a clarification zone (upper zone), a precipitation sealing zone (lower zone) and a device for receiving purified water. The operation of this device is based on the

II

69249 by vacuum flotation. The inlet of the water receiving channel is above the level of the central tube, and the channel is positioned against the current of the central tube. The channel through which the purified water is removed is very complex in structure and the water is removed through the gate into a closed chamber where the liquid surface is kept below the liquid surface in the gate.

The main object of the present invention is to provide a water clarification device which comprises means for removing air bubbles from the sewage entering the impoundment zone and which accordingly leads to an improvement in the purification of the sewage.

This object is achieved by being provided with a chamber for the collection of clarified water, which is connected to a non-suction tank, a circular chute for the removal of clarified water, protected against the ingress of ambient air by a hydraulic gate, and a radial chute connected to the pipe. for conveying the air discharged from the wastewater into the chamber, the radial chute being made into a closed vessel with a dewatering funnel with a hydraulic port, the inlet of which is located above the inlet of the central tube and downstream of it.

The water clarifier formed according to the invention provides efficient purification of sewage water due to the removal of very small air bubbles from the water entering the clarification zone, said removal taking place within a system comprising a radial chute in the form of a closed vessel and a chamber for collecting clarified water.

A preferred embodiment of the invention will now be described, by way of example, with reference to the accompanying drawing, which is a schematic diagram of a water clarification device according to the invention.

The drawing shows a water clarification device, which is a vertical tank 1 of square cross-section and reinforced concrete or steel and divided by a conical waterproof partition 2 into a clarification zone 3 and a sludge condensation zone 4. A closed gutter is connected to 1 !.

4 69249 with a sewer line 6 supplying water to be clarified via its head extending beyond the boundaries of the tank 1. The other end of the radial trough 5 communicates with a central tube 7 which extends downwards through the entire clarification zone 3 and terminates in the perforated radial tubes 8 at the lower part of said zone. Also included in the clarification zone 3 are the intermediate perforated part 9 and the sludge discharge pipes 10.

A system of pipes 11 is formed in the sludge compaction zone 4, which has a suction effect for drawing clarified water from the upper part of the zone 4. An outlet pipe 12 built into the bottom of the tank 1 acts to remove condensed sludge.

The radial chute 5 is provided with a drainage funnel 13 which is connected to a line 15 for removing the floating layer by means of a hydraulic port 14. The inlet of the funnel 13 is located above the inlet 16 of the central tube 7 and downstream of it. The radial chute 5 is also connected to the clarified water collecting chamber 18 via a pipe 17 passing above the upper edge of the drainage funnel 13, and the chamber 18 in turn is connected by an opening 19 to a clarified water removal system made in the form of a circular collecting chute 20 protected against the ingress of ambient air by a hydraulic gate 21 consisting of fixed vertical and horizontal parts. A chamber 18 for removing clarified water is connected to the anti-suction tank 23 via a pipe 22.

The proposed water clarifier works as follows. When the sewage has entered the closed space of the radial chute 5 via the line 6, a vacuum is created in the upper part of said space because the chute communicates with the anti-suction tank 23 through the pipes 17 and 22. Said vacuum causes solid particles suspended in the sewage to rise to the surface with air bubbles, thus forming a floating layer 24. The floating layer is moved due to the water flow towards the water-conducting funnel 13 and passed through it into the hydraulic port 14 and pipe 15 for later use.

Sewage water from which air bubbles have been removed and in which to some extent these solid particles are kept in suspension which has lost the floating layer enters the central tube 7 and reaches the middle part of the clarification zone 3 by means of a radial distribution tube 8 and a perforated partition 9. A sludge deposit has formed here due to the presence of suspended matter in the space between the perforated partition 9 and the peaks of the sludge outlet pipes 10. The coarser flocs of the cellulose contained in said deposit adsorb finer flocs to their surface, resulting in the formation of coarse flocs of suspended particles which are easily separated from the liquid under the clarification conditions prevailing in the sludge deposit.

The mechanical mixing of the particles separated from this in the sludge deposit facilitates the separation of the solid state from the liquid in the clarification zone 3. The coarse particles of sludge thus formed The water 4 separated in the condensation zone is taken through a system of pipes 11 for further use, and the condensed sludge is continuously removed via an outlet pipe 12 for utilization.

The air separated from the sewage enters the chamber 18 from the chute 5 via a pipe 17 which collects clarified water from the chute 20 and conducts it through a vertical pipe 22 to an anti-suction tank 23 which provides a vacuum inside the radial chute 5 and an air passage 23 The clarified water is recycled to the process from the anti-suction tank.

Claims (1)

A water clarification device comprising a clarification zone (3) and a sludge sealing zone (4) separated by a waterproof partition wall (2) in the clarification zone (3), and a radial trough (5) connected at one end to a central pipe (7). ) and at one end to a clarifying water supply line (6) for supplying water to the clarification zone and a circular collecting chute (20) for removing clarified water from the cleaning tank, characterized in that it is provided with a clarified water collecting chamber (18) communicating with a suction barrier (23). ), · And a circular collecting chute (20) for the removal of clarified water, protected against the ingress of ambient air by a hydraulic gate (21), and a radial chute (5) connected to a pipe (17) for conveying the exhaust air to the chamber (18) , wherein the radial trough is made into a closed vessel with h a dewatering funnel (13) provided with a hydraulic port (14), the inlet of which is located above the inlet (16) of the central tube (7) and in the direction of flow thereafter. li