FI58321C - ANORDINATION OF THE ACTIVITIES OF THE COUNCIL OF THE EUROPEAN UNION - Google Patents

Description

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Suomi-Finland (FI) (72) Timo% llykylä, Hämeenlinna, Suomi-Finland (FI) (5 * 0 Water treatment plant surface liquid removal device - Anordning för avlägsnande av ytvätska i ett vattenreningsverk

The invention relates to a floating overflow edge of liquid leaving a process of a liquid-containing basin, in particular a filling-emptying wastewater treatment plant (1 /, / 2), the intermittent operation of which is effected by the action of a gas-induced buoyancy.

The features of the invention appear from claim 1. Preferred embodiments of the device are set out in subclaims 2-5.

In known filling-emptying systems, the liquid leaving the process tank is drained by one of the following technical solutions: list at the end of the explanation).

2 58321 2. A floating discharge device in which the overflow edge is at a constant depth relative to the liquid surface of the process basin, following its variations, and which is connected to an articulated or flexible inlet pipe with an automatic shut-off valve / 3 /, / 4 /. The valve of the discharge device is controlled by a time mechanism either pneumatically, hydraulically or electrically.

3. Floating or above-water-supported discharge device, the periodicity of which is achieved by moving the overflow edge connected to the flexible discharge pipe vertically by means of a pneumatic or hydraulic cylinder or other mechanical device, the time mechanism controlling the operation / 5 /.

The fixed water supply arrangement according to solution 1 has the following disadvantages: the level of water to be removed cannot be adjusted, in gravity emptying the drain rate changes as the water level changes in the process pool, pump energy requirement, high cost of automatic inlet valve or drain pump, uncertain operation of moving parts in dirty conditions.

In the liquid discharge arrangement operating on the principle of solution 2, the outflow event of the outgoing water has been standardized. However, an automatic valve to be installed in the outlet pipe is relatively expensive and in dirty conditions the operation of the valve is prone to interference. Above all, in wastewater treatment plants, the overflow edge, which is constantly below the surface, collects solid matter in the outlet pipe during aeration, which packs into the shut-off valve, causing a risk of malfunction. The solid accumulated in the outgoing pipe is discharged into the water body together with the purified water in the clarification phase, impairing the cleaning result.

Since the overflow edge is clearly above the liquid surface in the discharge arrangement according to option 3 during the mixing step of the process, no solids from the process basin can accumulate in the outgoing pipe, so that the solids disadvantage of my solution does not occur. In addition, moving parts in contact with the fluid are kept to a minimum, which greatly improves the reliability of the system. However, the cylinder or mechanical device that moves the overflow edge is located in the wastewater treatment plant 3 58321 immediately above the pool during the aeration period in a dirty splash zone, which poses a risk of sticking and malfunctioning of moving parts. In addition, cylinders with their controls often need a separate power source, which makes the overflow structure expensive.

The discharge device according to the invention is a floating overflow connected to a flexible inlet pipe, which differs from the known and mainly technical solutions presented in option 3 in that the intermittently operating cylinder or mechanical device is replaced by a gas space below the overflow edge. . In this way, the placement of moving parts which are completely sensitive to contamination in the immersion or splash zone can be avoided, which improves the operational reliability of the device, especially in wastewater treatment. In wastewater treatment plants, the increase in the amount of gas in the gas space can be taken directly from aeration compressors, so a separate power source is not required. Compared to the systems of the known solution 3, the device according to the invention is considerably cheaper in structure because it lacks separate mechanical actuator devices.

Figure 1 shows an application example of the device according to the invention as a discharge water discharge structure of a wastewater treatment plant operating on the filling-emptying principle. When the wastewater is aerated in the basin (14), part of the compressor air is introduced along the air pipe (9) to the lower part (3) of the device, which acts as an air clock bounded by the partition (2) and the lower part of the jacket (1). When the lower part (3) is full of air, the buoyancy caused by it raises the device so that the overflow slots (6) of the outlet pipe (7) are considerably above the pool water surface (15), preventing water from escaping from the pool (14) through the outlet pipe (7). The wastewater to be treated during aeration raises the liquid level (15), but the distance of the outlet overflow slots from the liquid surface remains the same when the device can move freely vertically with the handlebar (13), bearing sleeves (10) and support beam (11) supporting the structure laterally and the flexible outlet For the limiters (12), the sound limits of the vertical movement of the discharge device can be adjusted to be process-specific.

4 58321

When the wastewater aeration cycle is over, the compressors are stopped and the pool water is allowed to clear. The air pipe (9) has a non-return valve (17) which prevents the backflow of gas when the compressors have stopped, so that the air remaining in the lower part (3) of the device still keeps the overflow slits (6) above the liquid surface.

Once the water in the process tank has become clear, open the valve (16) in the air pipe (9). The weight of the foaming structure compresses the gas from the bottom of the device through an open valve, whereby the device descends on the float (8) and the purified clarified water discharges through the jacket openings (5) and overflow slots (6) below the water surface into the outlet pipe (7). The overflow slots (6) are shaped so that the amount of flow changes substantially depending on the height position of the float (8). By changing the height position of the float (8), the flow discharged through the overflow slots (6) can be adjusted to the desired size. The flow openings (5) of the jacket are located well below the water surface, whereby the closed upper part of the jacket prevents any sludge rising to the surface from escaping with the outgoing water, which would impair the cleaning result. As the water level decreases, the discharge flow remains constant until the vertical movement limiter (12) of the discharge device stops the downward movement and overflow of the device.

Before starting the aeration, close the air pipe shut-off valve (16). When the compressors start, air (low back pressure compared to the aeration pressure) flows quickly along the air pipe (9), filling the lower part (3) of the device with air, the lift of which raises the overflow slots (6) above the liquid surface. The mixed liquid from the aeration tank cannot escape into the outlet pipe (7) and the tank is ready to handle the next effluent charge.

It should be noted that the device does not necessarily have to include the upper part of the jacket (1) and the flow openings (5) placed in it, as they are not essential for the general operation of the device.

The overflow structure according to the invention is particularly useful in conditions where: 5 58321 - liquid is periodically drained from the surface of the pool or immediately below it by means of a discharge pipe so as to disturb the deposition of liquids or liquid and solids in the pool as little as possible - pressurized gas is available operational risks.

Often all the above-mentioned conditions prevail in filling-emptying wastewater treatment plants, for which the device according to the invention is very well suited.

However, it is clear that the invention is not limited to an exemplary structure or an exemplary application in a wastewater treatment plant, but may vary within the scope of the appended claims. In this case, for example, the shape of the gas bag and the overflow edge may differ from the exemplary structure.

Viite.julkaisuna; / 1 / Patent application, Finland 180/71 (C 02 c 1/06) / 2 / Patent application, Finland 752230 (C 02 c) / 3 / Patent application, Finland 1047/69 (G 02 c 1/04) / 4 / Patent application , Finland 3286/73 (G 02 c 1/04) / 5 / M * Gr * Groiroriszy, In * fc g rm x "t ^ © ιιΐ ojpG2? 3t" fcion o ^ f · · · · · JWPCF 51, Feb . 1979, 274-287 -i! »

Claims (5)

6 58321 A surface liquid drainage device, operating in particular in connection with the intermittent clarification of a biological and / or chemical water treatment plant, comprising an outlet pipe (7) and overflow slots (6) fitted thereto and a float (8) characterized in that the device is supported vertically and comprises a gas space extending below the overflow slots (6) and the device being arranged to operate so that when the gas space of the device is filled with gas it causes a buoyancy which raises the overflow slots (6) of the device so that no liquid flows into the outlet pipe (7) after the gas space of the device has been removed, the device descends on the float (8), whereby the liquid can flow through the overflow slots (6) into the outlet pipe (7). Device according to Claim 1, characterized in that the height position of the overflow slots (6) relative to the surface of the liquid is adjustable by means of a float (8). Device according to one of the preceding claims, provided with a jacket (1) surrounding the overflow slots of the device, with flow openings (5) characterized in that the flow openings (5) are arranged in the jacket (1) so that they the exhaust pipe are completely below the liquid surface. Device according to Claim 1, characterized in that the vertical movement of the device is limited by stops (12) on both sides of the bearing sleeve (10) which are adjustable and mounted on the support rod (13). Device according to one of the preceding claims, characterized in that the gas space of the device is adapted to be filled by a side flow taken from the aeration device.