KR20020057592A - A Fast Flocculation Lamella Sedimentation Device Connected With Fast Reactor And Slow Flocculation Vessel - Google Patents

Abstract

PURPOSE: A fast flocculation lamella sedimentation device connected with fast reactor and slow flocculation vessel is provided, which can enhance efficient velocity gradient between fast reactor tank(30) and slow flocculation tank(32) and also collision frequency between particles. The system can separate solid(sludge) and liquid(treated water) in a shortened time even at very large settling surface load, which was enabled by increased effective settling area owing to upflow type lamella plate(5). CONSTITUTION: The system comprises a fast reactor(30), a slow flocculation tank(32), a flow passage(4), a settling tank(39), a scraper driving device(36), two-lamella plates(5), a water passage device(6) and a recycling pipe(34). Raw water coming in the fast reactor(30) and the slow flocculation tank(32) that is connected to the reactor(30) serially by a wall, in both of which agitators(2,3) are vertically installed, overflow through a water passage(4) to the settling tank(39). In the settling tank(39) having at the bottom center a sludge collecting pit(8), a scraper(7) driven by a scraper driver(36) is installed above the bottom plate and at one side top installed the lamella plate(5) through which treated water flow to discharge line(38), a part of sludge at the pit(8) being recycled to the fast reactor(2) through the recycling pipe(34).

Description

A Fast Flocculation Lamella Sedimentation Device Connected With Fast Reactor And Slow Flocculation Vessel}

The present invention relates to a wastewater treatment apparatus, and more particularly, to a high-speed aggregation ramp plate precipitation apparatus in which a rapid reaction tank and a slow aggregation tank are connected in series.

Generally, the wastewater treatment system removes organic matter and suspended solids in the wastewater using the principle of flocculation and sedimentation. Such water treatment devices have been widely used to purify plant wastewater, livestock wastewater, domestic sewage, and the like.

However, the conventional water treatment apparatus discharges stable treated water only when a large sedimentation area and a long flocculation time are satisfied. Therefore, when these conditions were not met, there was a tendency to rely on excessive drug administration and specialty drugs to obtain stable treated water. As a result, drug costs, sludge treatment costs, etc. have risen, resulting in problems that are uneconomical and inefficient.

Accordingly, the present invention has been made to solve the above problems, the first object of the present invention is to provide a high-speed aggregation ramp plate precipitation apparatus maximized the aggregation and precipitation efficiency by connecting a rapid reaction tank and a slow aggregation tank in series. It is.

It is a second object of the present invention to provide a high speed aggregating slant plate precipitation device connected to a rapid reaction tank and a slow agglomeration tank capable of treating a large amount of wastewater on a small scale by minimizing the appearance of the treatment apparatus.

An object of the present invention as described above, the raw water is supplied to one side, the rapid reaction tank 30 is provided with a first stirrer (2); A slow aggregation tank 32 connected in series with the rapid reaction tank 30 and provided with a second stirrer 3; A flow passage 4 connected in series with the slow agglomeration tank 32 and having a cross-sectional area extending downward so that the flow can be uniformly introduced into the settling tank 39 at a gentle flow rate; A settling tank 39 connected in series with the flow path 4 and having a sludge collection pit 8 formed on a bottom surface thereof; A scraper driver (36) rotatably formed at the lower portion of the settling tank (39) and one end thereof connected to the scraper (7); A plurality of inclination plates 5 installed on one side of the settling tank 39 and inclined at regular intervals; A treatment water overflow wear channel 6 installed on the inclination plate 5 for discharging the treatment water passing through the inclination plate 5; And a recirculation pipe 34 having one end connected to the sludge collection pit 8 and the other end extending to the raw water supply side of the rapid reaction tank 30 to recycle some sludge. The jaw is achieved by means of a high speed flocculation settler.

In addition, it is preferable that the first water flow guide plate 1 capable of inducing the flow of the raw water is further formed on the raw water supply side of the rapid reaction tank 30.

In addition, a recycle pump 9 for recycling a portion of the collected sludge between the sludge collection pit 8 and the recycle pipe 34; And it is possible to further provide a discharge pump 10 for discharging excess sludge.

In addition, the inclined plate 5 forms an angle in the range of 50 to 70 degrees with the horizontal direction, the intermediate region can be bent at a predetermined angle, the surface of the inclined plate 5 has a trapezoidal shape at regular intervals, respectively The space between the inclined plate 5 forms a circumferential cross section, characterized in that the lower portion of the inclined plate has a second water flow guide plate (11).

The scraper 7 is provided in a vertical direction with a predetermined length, and a plurality of pickets 12 can be provided in the radial direction of the settling tank 39.

The treated water well wear channel 6 may be formed of a triangular or square weir, and a plurality of well wear channels may be disposed on the inclined plate 5 evenly at regular intervals.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

1 is a schematic cross-sectional view of a high speed flocculation inclined plate precipitation apparatus connected to a rapid reaction tank and a slow agglomeration tank according to the present invention;

Figure 2 is a plan view of the high speed aggregation inclined plate precipitation apparatus shown in Figure 1,

Figure 3 is a front view of the high speed aggregation inclined plate precipitation apparatus shown in Figure 1,

4 is a plan view of the treated water overflow wear channel in FIG.

FIG. 5 is a side view of the treated water overflow wear channel shown in FIG. 4.

<Short Description of Main Reference Signs>

1: first water induction plate, 2: first stirrer,

3: second stirrer, 4: flow path,

5: inclined plate, 6: treated water overflow wear waterway device,

7: scraper, 8: sludge collection feet,

9: recirculation pump, 10: discharge pump,

11: second flow guide plate, 12: picket

30: rapid reaction tank, 32: slow flocculation tank,

34: recirculation pipe, 36: scraper drive device,

38: treated water outlet. 39: sedimentation tank.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic cross-sectional view of a high speed agglomeration inclined plate precipitation apparatus connected to a rapid reaction tank and a slow agglomeration tank according to the present invention, FIG. 2 is a plan view of the high speed agglomeration gradient plate precipitation apparatus shown in FIG. 1, FIG. 3 is a high speed agglomeration shown in FIG. Front view of the settling device. As shown in Fig. 1, 2, and 3, the high speed agglomeration sedimentation apparatus is largely composed of a rapid reaction tank 30, a slow agglomeration tank 32, a flow path 4, a slope plate 5, a settling tank 39 and the like. .

One side of the rapid reaction tank 30 is the raw water to be purified, the first water flow guide plate 1 is provided to guide the flow of raw water. The first water flow guide plate 1 is configured such that the flow of raw water flows from the bottom to the top for the optimum speed gradient in the rapid reaction tank 30.

Rapid reaction tank 30 is a square, the raw water is supplied from the bottom is discharged to the upper portion and the first stirrer (2) is installed in the central upper portion. In addition, one side of the recycling pipe 34 to be described later extends to the rapid reaction tank 30 so that some sludge can be introduced into the rapid reaction tank 30.

The slow agglomeration tank 32 has a square shape and is connected in series with the rapid reaction tank 30, so that water discharged through the upper portion of the rapid reaction tank 30 is introduced into the slow agglomeration tank 32, and the slow agglomeration tank 32 is used. It is configured to discharge through the lower part of the). A second stirrer 3 is installed at the center upper portion of the slow aggregation tank 32 to stir so that aggregation is effectively performed. In addition, the upper one side of the slow aggregation tank 32 is configured to be able to administer the organic polymer coagulant.

One end of the flow passage 4 is connected to the lower portion of the slow aggregation tank 32, and the other end is connected to the upper portion of the settling tank 39. The cross-section of the other end is wider than the cross-section of one end in order to allow the inflow into the settling tank 39 at a gentle flow rate while flowing the flow path 4. By connecting to the settling tank 39 without using a pipe, the flow passage 4 does not dissolve aggregates while the aged aggregates are introduced into the settling tank 39 and continues to ripen due to a predetermined interference. In the very fast sedimentation effect will be obtained.

The upper part of the settling tank 39 has a rectangular shape and the lower part has a substantially cylindrical shape, and a scraper 7 and a sludge collection pit 8 are installed at the lower part, and a plurality of inclined plates 5 and a treated water overflow wear channel at the upper part. The apparatus 6, the scraper drive device 36, and the process water discharge port 38 are provided.

The scraper 7 is provided in a vertical direction with a predetermined length, and a plurality of pickets 12 are provided while maintaining a constant distance in the radial direction of the settling tank 39.

The sludge collection pit 8 is installed at the bottom center of the settling tank 5 so that sludge can be collected. The collected sludge is discharged to the outside of the settling tank 39 through a pipe or the like.

The scraper drive device 36 is installed perpendicular to the center of the settling tank 39, and one end thereof is connected to the scraper 7 to rotate the scraper 7 at a constant speed.

The inclined plate 5 is a large upflow split type inclined plate, which is maintained at an angle of 50 to 70 degrees with respect to the horizontal direction, and the intermediate region is bent. Each side of the inclined plate 5 has a trapezoidal corrugation form at regular intervals. A plurality of such inclined plates 5 are arranged while maintaining a constant interval. Therefore, the space between each inclined plate 5 becomes a structure which has a cross section (foot column), and a series of parallel flow paths are formed. In addition, a second water flow guide plate 11 is provided in the lower portion of the inclined plate 5 so that the flow of fluid does not break. Accordingly, the water in the settling tank 39 can pass between the inclined plates 5 while maintaining a constant flow. Can be.

A sludge collection pit 8 is connected to a pipe, and a recirculation pump 9 and a discharge pump 10 are connected to the sludge collection pit 8. The recirculation pump 9 is for circulating a part of the collected sludge into the rapid reaction tank 30, and the discharge pump 10 is a pump for discharging the remaining excess sludge circulated.

Therefore, one end of the recirculation pipe 34 is connected to the recirculation pump 9, and the other end thereof extends to the upper portion of the rapid reaction tank 30.

The upper part of the inclined plate 5 is provided with a treated water overflow wear channel 6 for discharging the treated water that has passed through the inclined plate 5.

FIG. 4 is a plan view of the treated water overflow wear channel of FIG. 2, and FIG. 5 is a side view of the treated water overflow wear channel of FIG. 4. As shown in Fig. 4 and 5, the treated water overflow ware waterway device 6 is a plurality of evenly arranged at regular intervals by the channel of the triangular or rectangular weir, so that the flow of the treated water past the inclined plate (5) It is configured to discharge by induction. Accordingly, it is also possible to help ensure a constant flow between the plurality of inclined plates (5).

Hereinafter will be described the operation of the high-speed flocculation inclined plate precipitation apparatus is connected to the rapid reaction tank and slow agglomeration tank having the configuration as described above.

First, raw water of the waste water and waste water is introduced to the inlet side of the rapid reaction tank 30. At this time, the inorganic coagulant and some recycled sludge are added together. The inorganic coagulant is aluminum sulfate or iron salt. The introduced raw water enters the upper portion from the lower portion of the rapid reaction tank 30 while passing through the first water flow guide plate 1. At this time, collisions and interferences between aggregates start to occur. Entered raw water, inorganic coagulant, and sludge are reacted with rapid stirring by the first stirrer 2 rotating at about 180-240 rpm to produce initial aggregates.

Immediately before being introduced into the slow flocculation tank 32, an organic polymer coagulant is added to cause an aggregation reaction. As the polymer coagulant, a polyacrylamide series, which is one of the anionic polymer coagulants, is used.

In order to promote the aggregation reaction, the second stirrer is slowly stirred while rotating at a speed of about 30 to 60 rpm. The result is a matured aggregate that is easy to settle by slow mixing with the polymeric flocculant. After passing through the slow flocculation tank 32, the aggregate aggregated while passing through the flow passage 4 can be uniformly introduced into the precipitation tank.

In the flow passage 4, while the aged aggregates are introduced into the settling tank 39, disaggregation between the aggregates is not carried out, and the aged aggregates are continuously aged by a predetermined interference to obtain a very fast settling effect in the settling tank 39.

In the settling tank 39, the scraper 7 is rotated by the rotation of the scraper driving device 6. The rotating scraper 7 collects the sludge, and the collected sludge is concentrated and collected in the lower sludge collecting pit 8. Some of the collected sludge is supplied to the rapid reaction tank 30 by the recirculation pump (9), the remaining excess sludge is discharged by the discharge pump (10). The sludge discharged in this way is treated in a separate process (eg concentrated sludge storage tank or dewatering system).

The sludge recycled to the rapid reaction tank 30 increases the number of collisions between particles in the rapid reaction tank 30 to maximize the reaction and the aggregation effect. Thus, efficient precipitation and flocculation can occur.

Since the inclined plate 5 has an effect of increasing the effective settling area, separation of the solid (sludge) and the liquid (treated water) takes place effectively. Thus, a clear supernatant can be obtained even with a small settling area.

The treated water of the sludge-removed supernatant flows uniformly while passing from the bottom to the top between the large upstream separation type inclined plates 5. Then, once collected through the treated water overflow wear channel 6, it is discharged through the treated water outlet 38.

Specific parameters of the gradient plate precipitation apparatus according to the present invention are as follows. That is, the residence time of the rapid reaction tank 30 is 5-10 minutes, the residence time of the slow aggregation tank 32 is 5-10 minutes, the residence time of the precipitation tank 39 is 20-40 minutes, and the surface area load of the precipitation tank is 7-15m / hr, surface area load on the top of the inclined plate is 10-20m / hr, the interval of the inclined plate is 50-100mm, the vertical height of the inclined plate is 0.8-1.5m, the angle of bending of the inclined plate is 60 degrees, the recycle rate of sludge is raw water 5-30% of the input rate, the stirring speed of the rapid reaction tank is 180-240rpm, the stirring speed of the slow aggregation tank is 30-60rpm, and the circumferential speed of the scraper is 2-4m / min.

In another modified embodiment of the settling tank 39 in the present invention, the lower part of the settling tank 39 may be manufactured in a quadrangular pyramid or conical shape. In this case, a scraper may not be installed.

In addition, in the present invention, only the introduction of the sludge, the inorganic coagulant and the organic polymer flocculant was described, but it is a matter of course that a separate chemical or substance can be added in each process as necessary to facilitate the treatment process.

According to the high speed agglomeration inclined plate precipitation apparatus connected to the rapid reaction tank and the slow agglomeration tank of the present invention as described above, it is possible to increase the effective speed gradient between reaction and aggregation and the frequency of collision between particles, and is effective by the upflow separation type inclined plate 5. Due to the increased sedimentation area, it is possible to separate solids (sludge) and liquids (treated water) in a short time even at a very high sediment surface loading rate.

In addition, the small size of the device saves installation space, and has the advantage of being able to treat a large amount of contaminated water economically and reliably.

Therefore, the high-speed agglomeration inclined plate sedimentation apparatus connected to the rapid reaction tank and the slow agglomeration tank according to the present invention can be effectively applied to the pretreatment process and the post advanced treatment process of the wastewater treatment device which is overloaded, or the contaminated appeal, stream and combined sewer pipe overflow water treatment. .

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will cover such modifications and variations as fall within the spirit of the invention.

Claims (7)

Raw water is supplied to one side, the rapid reaction tank 30 is provided with a first stirrer (2); A slow aggregation tank 32 connected in series with the rapid reaction tank 30 and provided with a second stirrer 3; A flow passage 4 connected in series with the slow flocculation tank 32 and having a cross-sectional area extending downward; A settling tank 39 connected in series with the flow path 4 and having a sludge collection pit 8 formed on a bottom surface thereof; A scraper driver (36) rotatably formed at the lower portion of the settling tank (39) and one end thereof connected to the scraper (7); A plurality of inclination plates 5 installed on one side of the settling tank 39 and inclined at regular intervals; A treatment water overflow wear channel 6 installed on the inclination plate 5 for discharging the treatment water passing through the inclination plate 5; And One end is connected to the sludge collection pit (8), the other end is extended to the raw water supply side of the rapid reaction tank 30, the rapid reaction tank and slow agglomeration tank, characterized in that consisting of a recycle pipe 34 for recycling some sludge Connected high speed flocculation settler According to claim 1, wherein the rapid water supply tank of the rapid reaction tank 30 is connected to the rapid reaction tank and slow coagulation tank, characterized in that the first water flow guide plate 1 is further formed to induce the flow of the raw water. High speed flocculation settler. 2. The recycling apparatus of claim 1, further comprising: a recirculation pump (9) for recycling a portion of the collected sludge between the sludge collection pit (8) and the recirculation pipe (34); And High speed agglomeration inclined plate precipitation apparatus is connected to the rapid reaction tank and slow agglomeration tank characterized in that the discharge pump 10 for discharging excess sludge is further installed. The inclined plate precipitation apparatus of claim 1, wherein the inclined plate (5) forms an angle of 50 to 70 degrees with a horizontal direction, and the intermediate region is bent at a predetermined angle. 5. The rapid reaction tank and the slow aggregation of claim 4, wherein a space between the inclined plates 5 forms a circumferential cross section, and a second water flow guide plate 11 is further provided below the inclined plate 5. High speed agglomeration inclined plate sedimentation device connected to the jaw. The rapid reaction tank according to claim 1, wherein the scraper (7) is installed in a vertical direction with a predetermined length, and a plurality of pickets (12) are provided in a radial direction of the settling tank (39). And high speed flocculation sludge settling device connected to the slow flocculation tank. The method of claim 1, wherein the treated well wear channel 6 is composed of a triangular or square weir, the plurality of well wear channels are arranged on the inclined plate 5 evenly at regular intervals. High speed agglomeration inclined plate sedimentation device connected to a rapid reaction tank and a slow aggregation tank.