HU206529B - Apparatus for mixing fluids having quality different from each other particularly sewages and apparatus for contacting water and chemical agent particularly treated sewage and chlorine for the purpose of disinfection - Google Patents

Abstract

Installation for mixing effluents and for bringing them in contact with chemicals and/or final disinfection by chlorine,- is equipped with holder (1a), a device conveying the liquids to be mixed and an outlet for the treated mixt. The holder (1a) is of cylindrical shape. The conveying device located in the holder area or placed above the holder following its dia carries a number of outlets or contains an element supplying liq. along its whole length. The holder contains at least one convection generating device near its wall. The mixed liq. removing device is in or near the vertical central axis(x) of the cylindrical holder. - The unit which ensures contact between fluids and chemicals is equipped with respective inlets and an outlet for the treated liqs. This amt is also cylindrical and as also contains a convector, and an outlet. The inlet pipe enters the unit laterally and is placed near the convector.

Description

The mixing device has a basin (1a), a means for delivering the liquids to be mixed to the basin (la), and an opening for removing the mixed liquids from the basin (la). This apparatus is characterized by having a circular planar cylindrical basin (la). The means for delivering the liquids to be mixed into the basin (Ia) is comprised of an element having a diameter in the basin space and / or above the basin (Ia) having a plurality of fluid discharge points or capable of discharging the liquid throughout. A flow generating means is provided in the pool compartment at least at one location near the cylindrical wall. The outlet for mixing liquids is in or near the vertical geometric center axis (x) of the pool (la).

She /

The apparatus for contacting the chemical and liquid comprises a pool (1b), means for feeding the liquid and chemical, and an aperture for discharging liquid exposed to the chemical. The essence of this device is that it has a circular planar cylindrical basin (lb). A flow generating means is provided in the pool compartment at least at one location near the cylindrical wall. The outlet for the liquid to be exposed to the chemical is located in or near the vertical central geometric axis (y) of the pool (lb). A fluid delivery device, such as a feed tube (13), extends from the side into the pool space in the vicinity of the flow generating device.

HU 206 529

Scope of the description: 10 pages (including 3 pages) ι

HU 206 529 Β

FIELD OF THE INVENTION The present invention relates to the mixing of liquids of different quality, in particular wastewater, for purposes of averaging or homogenization. The invention also relates to an apparatus for contacting water and a chemical, in particular treated wastewater and chlorine for disinfection.

When treating wastewater, especially industrial wastewater, it is often the case that smaller, complementary units of production produce different wastes of different quality and / or concentration and / or yield, which are thoroughly mixed - partial homogenization, in other words: averaging - wastewater. can be very important for cleaning. For the purpose of mixing such different wastewaters for the purpose of averaging (homogenization), rectangular basins are generally used, which, of course, operate with high specific energy (30-40 W / m ³ ) mixers. Alternatively, various basins with mixing troughs are used which are divided by two diagonal walls. The wastewater to be mixed is either channeled to the basin divided into several compartments on two narrow sides of the rectangle, divided into compartments by internal walls, and the balanced wastewater is collected and discharged through troughs at the upper end of the diagonal wall, or is carried out through the compartments, while the average wastewater is removed at the short end walls. The first type of basin is severely handicapped by the high energy required to mix the water mass, while mixer troughs can be expensive to build, complex, difficult to maintain, and difficult to remove, possibly at the expense of draining the pool.

It is known that facilities for the treatment of municipal wastewater are always equipped with disinfection equipment for treated (settled) sewage. Such equipment is permanent or intermittent, and has a maze or settling system, depending on the particular circumstances and regulatory requirements (guidelines). The disinfection basins, built on large wastewater treatment plants, are 3-4000 m ³ , rectangular in shape, flow-through, and equipped with a machine sludge scraping device to remove a small amount of sludge. The cost of constructing and operating such equipment and pools is very high.

It is an object of the present invention to provide an apparatus for mixing, homogenizing, i.e., averaging wastewater of various kinds, in particular wastewater of different concentrations and / or qualities and / or yields, which can be set up at low investment cost and with minimal energy input, baffles and complicated baffles. can be operated to provide optimum leveling - mixing effect. SUMMARY OF THE INVENTION It is an object of the present invention to provide a device for further disinfection of treated wastewater in which the pool volume is fully utilized for mixing and its investment and operating costs are substantially lower than those currently known.

The invention is based on the discovery that a large mass of fluid can be kept in a circular cylindrical pool with the least energy input, with a rotary impulse near the wall, and a special rotating mass of water in several locations or in a continuous diagonal line. besides - optimally homogenize-equalize (average). The same water movement theoretically and practically ensures the longest possible residence time with the effluent being introduced tangentially into the basin, which provides optimum results for the disinfection of treated wastewater,

Based on the above findings, the object of the present invention has been solved by the use of an averaging pool having a pool, means for delivering the liquids to be mixed into the pool, and an opening for removing the mixed liquids from the pool, that it has a circular cylindrical pool; the means for delivering the liquids to be mixed into the basin comprising an orifice within the basin space and / or having a plurality of fluid discharge locations extending across the basin or capable of discharging the liquid along its entire length; a flow generating means is disposed in at least one location in the pool compartment near the cylindrical wall, and the orifice for discharging mixed liquids is located in or near the vertical geometric center axis of the pool.

Preferably, the means for delivering fluids to the pool is formed by a feed tube extending above the pool, preferably having downwardly directed inlet heads, e.g., fluid jet nozzles. Alternatively, the means for delivering liquids to the pool is formed by a trough over the pool. It is also conceivable that a perforated tube is drawn below the liquid level, and the liquids to be homogenized are mixed with the volume of water circulating in the basin through the openings thereof.

According to a further feature of the invention, the flow generating device is a propeller, but it is also possible to use, for example, a pump located below the liquid level.

Another embodiment of the apparatus is characterized in that the opening for discharging the mixed fluid out of the pool is formed by a sump formed in or connected to the pool bottom, to which - preferably, a conduit is discharged under the pool.

It may also be advantageous to provide an embodiment of the apparatus having a manhole with a roll-over wall, one of which holds a conduit for discharging the mixed liquid out of the basin and an outlet pipe for discharging the mixed liquid out of the other.

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The invention also relates to a device for contacting a liquid and a chemical, in particular treated waste water and chlorine, having a basin, means for supplying a liquid and a chemical, and an opening for discharging a liquid exposed to the chemical, has a cylindrical pool with a plan; a flow generating means is disposed in at least one location in the pool compartment near the cylindrical wall; the fluid outlet opening is located at or near the vertical geometric center axis of the pool and extends from the side of the fluid delivery device, such as a feed tube, into the pool space around the flow generator.

Preferably, the fluid supply means, such as a conduit, extends tangentially into the pool space.

In another embodiment, the feed tube extends in a direction other than tangential to the pool space and is provided with a deflection deflection wall spaced from, but preferably parallel to, the pool wall. It may also be advantageous to have a chemical feeding device, such as an ejector, in the vicinity of the stall of the fluid supply line, such as the feed tube.

In another embodiment, the apparatus has a mixing basin having a mixing device, such as a propeller, into which a fluid conduit for chemical contact and a chemical feed means terminates, and out of the mixing basin an inlet pipe for entering a circular basin.

Finally, it is expedient that the apparatus has a manhole with a sloping wall, one of the compartments having a channel or conduit for discharging liquid exposed to the chemical, and the other compartment having an outlet pipe for removing liquid from the apparatus, and an opening is formed in the bottom plate of the pool, and if the fluid supply opening extends into the pool space in the upper region of the pool sidewall.

The invention will now be described in more detail with reference to the accompanying drawings, which show preferred embodiments of the apparatus. In the drawings, in Figure 1 are the forces acting on the fluid mass rotated in a circular basin by a flow generating propeller;

Figure 2 illustrates fluid motion in a circular basin caused by a pulse applied at one location near the wall; Fig. 3a is a sectional view taken along line A-A in Fig. 3b;

Figure 3b is a plan view of the apparatus of Figure 3a; Fig. 4a is a sectional view taken along line B-B in Fig. 4 / b;

Figure 4b is a plan view of the apparatus of Figure 4a.

206529 B 2

In the basin (1) of internal diameter D shown in Fig. 1, a low speed (n _prop - 40-80 / min) flow generating propeller (2) is located in one place adjacent to its cylindrical wall, by means of which the mechanical work moving the track in rotation. The entered work converts to velocity height. The loss of momentum e _{c of} the rotating body of water is due to a small extent to the internal friction of the water particles, but mainly to the friction loss on the pool wall and bottom. This height of loss will be equal to the height of speed h ':

e _c - z- (mkg / kg) - h '- y (mkg / kg) z _g

Propeller (2) thus increases the speed of rotation of the water until the two forces are in equilibrium.

Theoretically, the circumferential velocity of the water (liquid), assuming very little friction, would only increase until it was equal to the water delivery velocity resulting from the "pitch" of the propeller blade and the propeller revolution (2); because then there is no more energy input into the fluid. _The maximum circumferential velocity of the V _{max is} expected to be about 2.0 m / s with the use of well known, high efficiency, low speed flow propellers. Proven by a calculation, for example, a volume of 2400 m ^3, D - 32.0 m in diameter, smooth wall and formed in the cylindrical wall fenékfeiületű basin iunax ^v "2.0 m / s peripheral speed of the maximum weight of water h 'height velocity, i.e. friction loss of 0.128 m. which means Q-1.0 m ³ / sec. we would raise the amount of incoming water to this height. This power requirement can be met by the propeller (2), which is considered as a lifting machine and has a power requirement of 1.67 kW, with an extremely low specific power consumption of 0.7 W / m ³ . In Fig. 1, the direction of rotation is indicated by the arrow [corresponding to the fluid movement induced by propeller (2), sensed by the arrows', and its circumferential velocity along the wall is V _Klt · the velocity in the center region of basin (l) is indicated by V _Kb We were detected. In the pool (1), the momentum of the body of water (corresponding to velocity) is ¢ 2

- - [mkg / kg]; friction loss corresponding to a loss height of ² Ϊ _v 2 ah - p - (mkg / kg)

From the 5Q formula: the power requirement for the water cycle

Calculated from N = [kW].

In Figure 2, the flow path (3) of an elemental water particle (3), which is a helix starting from the propeller (2), is also drawn in the basin (1). In Figure 2, the maximum circumferential velocity is the largest radial velocity V _d , and an intermediate circumferential velocity V _{kn is} an intermediate radial velocity v _m ,

The velocity values (ie the actual velocities of the water particle) are indicated by the arrows V _max and V _r . From Figure 2, it is easy to see that a unit mass of water introduced at one place on the wall of the basin (1), due to the rotation of the mass of water by the propeller (2), cannot reach the outlet at the centerline 0 reach it on the track. By the way, it can be proved by calculation that for the pool sizes mentioned in Figure 1 (D = 32.0 m and volume 2400 m ³ ) the following characteristic values are obtained:

- maximum circumferential speed: - 2,0 m / s;

rotating water body rotation speed: 0.83 rpm:

- The radial velocity v _r varies between 0.005-0.08 m / s: and with these values

the unit of water introduced at the perimeter reaches the outlet at the center O by a spiral movement of n - 33 threads and the total length of the spiral is 1700 m. Liquid movement in such a spiral path can be perceived as moving in a pool of labyrinths with a large number of bulkheads, but in reality there is no need to build a bulkhead with a total length of about 1700 meters and virtually no hydraulic fall due to many walls. "-L would be 7 m.

Figures 3a and 3b show a preferred embodiment of the balancing averaging apparatus according to the invention. The (la) basin, of either reinforced concrete or steel structure, is a cylindrical, circular planar structure whose x-axis is centered on a vertical geometric axis. the diameter

D. the water depth is indicated by the reference h and the water level by the reference letter v. To rotate the water, a propeller, preferably a slow-speed flow-generating submersible (2a), is arranged inside the wall of the pool (la), having a power selected according to the size (volume) of the pool. The required specific energy input is 1 W / m ^{3 of} pool volume. The propeller (2a) is mounted in the basin (1a) so that it can be easily lifted onto the hinged cantilever operator platform (3) for maintenance or repair and can then be easily released back into the basin (la).

The pool (Ia) has a balanced body of water and is provided with a feed pipe (4) extending across the pool (1a) for introducing new water of varying quality and / or concentration and / or yield to be supplied. The feed tube (4) is suspended from the support structure (5) located above the basin (1a) (which has been omitted from FIG. 2 for greater clarity) but may also be mounted on a support structure. The feed pipe (4) is provided with a plurality of downwardly directed inlet heads (6) (Fig. 3a), the number of which can be determined by scaling according to the particular conditions (number, concentration, amount of wastewater to be averaged, etc.). a.

The inlet heads (6), which are spaced apart from one another, are installed or formed along the entire length of the feed pipe (4). At the bottom of the basin (la), a sump (7) in the vertical geometric center axis x is recessed, of which a conduit (8) is led under the basin into a shaft (9) constructed outside the basin (la) fits to the outside. A tumbler wall (10) is integrated into the shaft (9) and the conduit (8) extends into the inner compartment of the shaft (9), which is drained from the outer compartment (11) of the shaft.

3a, 3b is operated as follows:

the wastewater to be averaged (homogenized) is introduced into the feed pipe (4) according to arrow b. The quantity of Q fed into the inlet heads (6) exits as jets of water in the form of jets of water downward in accordance with arrows c and mixes with the mass of water rotating in the basin (la) (the arrow). Rotary motion is induced and maintained by actuating propeller (2) (arrows a '). The mixing-homogenization of the incoming partial water jets (arrows c) and the rotating water mass, i.e. the averaging of wastewaters of different quality and / or concentration and / or yield, is very well done. The homogenized wastewater during the spiral flow (see Fig. 2) admits an arrow (Fig. 3a) through the sump (7) and exits through the conduit (8) from the basin (la) and according to this arrow drawn in Fig. 3a. passing through the tilt wall (arrow f) into the inner compartment (9) of the shaft (9) enters the outer compartment (9) and discharges Q through the outlet pipe (11) in accordance with arrow g. The constant water level v in the basin (la) can be provided by the tilting wall (10) with an adjustable pitch.

Figures 4a, 4b show a preferred embodiment of the disinfection device according to the invention. In this case, the cylindrical circular planar (1b) is also equipped with a submersible propeller (2b) located on the inside of the cylindrical wall, near the wall, which is indicated by a hatch (12) for mounting, maintenance or repair (Fig. 4b). can be lifted out and easily discharged into the pool (lb). It is sufficient to use a low-speed (1 W / m ³ ) low velocity flow generator (lb) propeller, which will keep operating costs low. A feed pipe (13) is provided for supplying the treated wastewater to be contacted with the chemical to the basin (lb) of diameter D, which is connected to the basin (lb), near the propeller (2). A relatively short stop-baffle wall (14), parallel to the pool wall, is installed in the interior of the pool (lb) at intervals prior to the feeding of the feed pipe (13), which on the one hand ensures that the treated treated waste water on the other hand, to mix well with the water already in motion in the basin. 4a. Figure 4b

In the exemplary embodiment of EN 206529 Β, the mixing basin (15) installed adjacent to the basin (lb) starts from said feed pipe (13), in which a propeller (2c) is arranged and into which the treated sewage supply line is connected. The disinfectant chemical, usually Cl _2, is first contacted in this mixing basin (15) with the treated wastewater, where the propeller (2c) mixes the chemical fed according to the ap arrow with the wastewater and through the feed pipe (13) is already a chemical-water mixture. enters the impact (lb) pool. Alternatively, depending on the size of the facility and other factors, the feed pipe 13b may be provided in place of the feed pipe 13b instead of the feed pipe 13b, and the mixing tank 15 may be omitted. In this case, the chemical, usually Cl ₂ , is introduced directly into the basin (1b) by means of an ejector (17) or a perforated pipeline or other means in the area of the injection pipe directing the treated sewage and the propeller (2b). (arrow r), to the beginning of the current (arrows') generated by the propeller (2b).

At the center of the bottom plate of the basin (lb) is a drainage opening (18) in the vertical geometric center axis X to which a channel (19) covered by covers (20) is connected, which is a shaft (21) (21a) to the bottom of the inner compartment. (Instead of a duct, a pipe guided beneath the bottom plate of the pool (lb) may be used.) The shaft (21) has a sloping wall (22) for holding the required water level in the pool (lb). The drainage pipe (24) exits from the bottom of its outer compartment, through which the disinfected sewage is discharged. A line (26) connecting the inner compartment (23) and the outer compartment (23) is provided, and can be drained by means of a gate valve (27) or alternatively, a submersible pump (not shown) may be used to completely drain the pool (lb).

Operation of the apparatus according to Figures 4a, 4b is as follows:

operating the propeller (2b) to flow and maintain the treated (sedimented) waste water mass in accordance with arrows a 'and û; the mass of water flowing towards the central outlet (18) in a helical path as shown in Figure 2. The treated wastewater to be disinfected is conveyed via line 16 through line 16 to the pre-mixing basin 15 where Cl ₂ is also fed in a predetermined amount for disinfection according to arrow p. By operating the propeller (2c), the chlorine and the treated water are thoroughly mixed with one another and this chemically premixed water is introduced through the feed pipe (13) into the pool (1b). The chemical-mixed wastewater arrives at the outlet (18) after a large number of turns of spiral movement (see also FIG. 2), so that sufficient time for chemical exposure is provided to ensure disinfection. The disinfected water enters the channel (19) through the outlet opening (18) through the outlet opening (18) and from the outlet opening (21a) into the inner compartment (21a) of the shaft (21). From the inner compartment (21a), the disinfected water flows through the arrow (23) to the outer compartment (23) of the shaft (21a), from where it passes through the drain (24) to a receiver (not shown). During gravity drainage of the disinfected waste water to the recipient, water levels a and v _2ntax in and between the outer compartment (23) of the shaft (21) may be formed.

Advantageous effects of the invention may be summarized as follows:

both the equalizing-homogenizing device and the disinfecting device can be operated with very low specific electrical power (0.51.0 W / m ³ ) and the hydraulic drop loss is much lower than that of other systems; thanks to these factors, homogenisation averaging and long residence time and optimal space utilization can be achieved very economically in disinfection. The investment cost of averaging pools is also very favorable, as without the help of baffles and complicated manifolds, the best equalization-averaging effect is achieved. At the disinfection basin, sedimentation - but otherwise transported to the recipient - can be removed without a dredging structure, merely by a spiral flow, because despite the minimal (1%) bottom drop, the rotating water mass ensures continuous sedimentation and centering. The possibility of dead spaces or short circuits in the disinfection basin is also excluded; the calculated volume can be maximized.

When used as a periodic disinfectant, disused machines - which represent only a small portion of conventional engineering equipment 20-30% of investment cost - can be removed and stored, extending their lifetime by many times the amount of equipment that is permanently outdoors. In addition to savings in civil engineering and engineering, as well as operating costs, maintenance costs are also significantly reduced.

In conclusion, the equipment according to the invention is significantly more economical in terms of both investment and operation than currently known similar facilities, while fully meeting the technological needs.

The invention is, of course, not limited to the specific embodiments detailed above, but may be practiced in various ways within the scope of the claims. Thus, for example, the averaging device can be successfully used not only in wastewater treatment but also in other fields, such as the chemical industry. Drainage from the pool can occur not only at the bottom but also at the top. Other flow generators may be used instead of propeller, but other modifications may be possible without exceeding the scope of protection.

HU 206 529 Β

Claims (14)

PATENT CLAIMS 1. Apparatus for mixing liquids of different quality (properties) and / or concentration and / or yield, in particular wastewater, mainly for the purpose of averaging, having a pool, means for transferring the liquids to be mixed into the basin, and removing the mixed liquids from the basin a service opening, characterized in that it has a circular planar cylindrical basin (la); the means for transferring the liquids to be mixed into the basin (la) comprising an element having a diameter in the basin space and / or above the basin, comprising a plurality of fluid discharge points or capable of discharging the liquid along its entire length; a flow generating means is disposed in at least one location in the basin space near the cylindrical wall, and the opening for discharging mixed liquids is in or near the vertical geometric central axis (X) of the basin (1a). 2. The l. Apparatus according to claim 1, characterized in that the means for delivering liquids to the basin (Ia) is formed by a feed tube (4) extending above the basin (Ia), preferably having downwardly directed inlet heads (6), for example fluid jets. Apparatus according to claim 1, characterized in that the means for delivering the liquids to the basin (1a) is formed by a trough over the basin (1a). 4. Apparatus according to any one of claims 1 to 4. characterized in that the flow generating means is formed by a propeller (2a). 5. Apparatus according to any one of claims 1 to 4, characterized in that the opening for the mixing liquids out of the basin (1a) is formed by a sump (7) formed in or connected to the basin to which a conduit (8) is connected, preferably under the basin (1a). . 6. Apparatus according to any one of claims 1 to 4, characterized in that it has a manhole (9) having a tilting wall (10), one of which has a conduit (8) for discharging the mixed liquid from the basin (1a) and a compartment for discharging the mixed liquid the serving drain pipe (11) comes out. Apparatus for contacting liquids and chemicals, in particular treated wastewater and chlorine, for disinfection, comprising a basin, means for supplying liquid and chemicals, and an aperture for discharging liquid exposed to the chemical, characterized by a circular planar cylindrical basin (lb); a flow generating means is disposed in at least one location in the pool compartment near the cylindrical wall; the opening for discharging liquid exposed to the chemical penetration is in or near the vertical central geometric axis of the basin (lb); and a fluid delivery device, such as a feed tube (13), extends sideways into the pool space in the vicinity of the flow generating device. Device according to claim 7, characterized in that the fluid supply means, such as a conduit, extends tangentially into the pool space. Apparatus according to claim 7, characterized in that the feed tube (13) extends in a direction other than tangential to the pelvic space and is provided with a deflection deflection wall (14) at a distance from, but preferably parallel to, the basin wall. built into the pool (lb). 10. Apparatus according to any one of claims 1 to 5, characterized in that in the vicinity of the opening of the liquid supply line, such as the supply pipe (13), there is a chemical supply means, such as an ejector (17). 11. Apparatus according to any one of claims 1 to 5, characterized in that there is a mixing basin (15) having a mixing device, such as a propeller (20), into which the fluid supply line (16) for chemical contact and the chemical feeding device terminates. the feed tube (13) extending into the circular basin (2b) is discharged. 12. A 7-11. Apparatus according to any one of claims 1 to 3, characterized in that it has a manhole (21) having a roll-over wall (22) having a channel (7) or a conduit connected to a drain opening (18) for discharging liquid exposed to the chemical. the outlet pipe (24) for removing fluid from the unit is exited. 13. A 7-12. Apparatus according to any one of claims 1 to 3, characterized in that the outlet (18) is formed in the bottom plate of the pool (1b). 14. A 7-13. Apparatus according to any one of claims 1 to 3, characterized in that the fluid supply opening extends into the pool space in the upper region of the side wall of the pool (la).