KR20120058428A - Slant Plates For Flocculation Formation And Flocculation Settling Treatment Tank Adopting The Slant Plates For Flocculation Formation - Google Patents

Abstract

PURPOSE: A floc forming slanted plate and a coagulating sedimentation treating bath equipped with the floc forming slanted plate are provided to form floc based on the corrosion of fine flocs and to drop the floc along the slanted plate. CONSTITUTION: A floc forming slanted plate includes an opening(2). An upper side and a lower side are arranged at the opening to the orthogonal direction of the slanted plate. A sedimentation treating bath forms floc based on the contact of fine floc particles with existing floc particles. The floc particles are settled and separated. The fine floc particles are formed by following: inorganic coagulating agent is injected into water to be treated; the water with the inorganic coagulating agent is stirred in a rapid stirring bath; and fine suspended particles are finely flocculated.

Description

Slant Plates For Flocculation Formation And Flocculation Settling Treatment Tank Adopting The Slant Plates For Flocculation Formation

The present invention relates to an inorganic coagulant injecting step of injecting an inorganic coagulant into the water to be treated and to mixing the treated water into which the inorganic coagulant is injected in a rapid stirring tank to finely suspend fine suspended particles in the water to be treated. In the flocculation process tank which performs the flocculation process including the process which further flocculates the microfloc particle formed by the flocification microflocification process by contact with existing floc particle, and the sedimentation-separation process with respect to the said floc particle. The invention relates to an inclined plate for floc formation involved in the flocculation and the sedimentation separation treatment.

Although the flocculation sedimentation process of the to-be-processed water is employ | adopted as a pretreatment of sand filtration, in the said flocculation precipitation method, the inorganic flocculant is inject | poured into to-be-processed water, and the diameter of the diameter which can separate and isolate the fine suspended particle contained in the to-be-processed water is sedimentary. The floc is agglomerated, and the floc is subjected to sedimentation treatment by the action of gravity.

In the flocculation sedimentation process of the to-be-processed water, the inclination plate for floc formation is provided in the final stage of flocculation or the intermediate part which reaches the said final stage, and contributes to the flocculation formation of unfloc.

In the said floc forming inclination plate, each inclination plate is formed by providing a plurality of parallel plates in parallel, and making turbulence and / or vortex generate | occur | produce between each inclination plate, especially a lower surface and its upper side. Based on the collision between the flocs, flocculation is realized.

However, in the case of such a flat plate, there is a limit to the formation of turbulence and / or vortex.

In view of such a situation, in Patent Document 1, a base plate is provided at an appropriate distance above the bottom surface of the inclined plate for floc formation, and turbulence and / or vortex due to collision between the base plate and the water to be treated. It is proposed to increase the degree of formation of and to replenish precipitated particles.

In the case of the said structure, turbulence and / or a vortex are formed by the vicinity of each base board certainly, and the frequency of the collision with a microfloc can be raised.

However, in the above structure, the floc formed by the unfloc collision has a fatal defect in that it accumulates in the base region of the base plate as the upper side of each inclined plate and the floc cannot fall from each inclined plate.

As described above, in the prior art, while forming turbulence and / or vortex which increase the frequency of collision between miflocs in the case of a flat plate, there is no constitution that enables the fall of the miflocs.

The present invention enables realization of turbulence and / or vortices, which increase the frequency of collisions between microflocs, as compared with the case of flat plates, and moreover, flocs formed by collisions between microflocs can fall along each inclined surface. It is a subject to provide the structure of the precipitation flocculation process tank which employs the formation inclination plate and the said floc formation inclination plate.

In order to solve the above problems, the basic configuration of the present invention,

(1) An unflolocated process of injecting an inorganic coagulant into the water to be treated and mixing and stirring the treated water into which the inorganic coagulant is injected in a rapid stirring tank to pre-flolocate the fine suspended particles in the water to be treated. In the precipitation treatment tank which carries out the flocculation process including the process which further flocculates the microfloc particle formed by the process by contact with existing floc particle, and the sedimentation-separation process process for the said floc particle, The said flocculation and the said precipitation A floc forming inclined plate that is involved in a separation process, the floc forming inclined plate having an upper side and a lower side arranged in each inclined plane along a direction orthogonal to the direction of the inclined plane in each inclined plate,

(2) It consists of the flocculation settling tank which installs the inclination plate for floc formation of said (1) in the uppermost part or the intermediate | middle part which reaches the uppermost part.

In the present invention based on the above basic configuration, the frequency of collision between miflocs is raised by generating turbulence and / or vortex as in the case of the lower end of each inclined plate at the upper side of the opening and the upper side thereof. Further, while efficient flocculation and flocculation precipitation treatment are promoted, the efficiency of the flocculation precipitation treatment tank can be reduced.

Fig. 1 is a plan view of a floc forming inclined plate showing the basic configuration of the present invention, (a) shows a rectangular opening, (b) shows a triangular opening, and (c) shows a semicircle. The opening of the shape is shown.
Fig. 2 is a side cross-sectional view of the height position of the openings, in which (a) shows an embodiment in which the height positions of the openings in each inclined plate are set equally, and (b) shows a pair of neighboring flocs formed. In the inclined plate for which the height position at which the opening of one of the floc forming inclined plates is formed, the height position at which the inclined surface of the other floc forming inclined plate is formed, and the height at which the inclined surface of the other floc forming inclined plate is formed Embodiments in which the positions correspond to each other and are set identically are shown.
FIG. 3 is a plan view of an embodiment in which protrusion protrusions are formed in contact with the inclined surfaces of the inclined plates located next to each other along the inclined direction from the top or the vicinity of the floc forming inclined plate to the bottom or the vicinity thereof (a) Shows the case where the protrusions are straight, and (b) shows the case where the protrusions are meandering.
4, in each inclination plate, in the area | region where an opening does not exist or in the area | region which spans an opening, a plurality of protrusion-shaped recessed parts which contact the inclined surface of each inclined plate located next are formed in the direction orthogonal to the inclination surface direction, As a configuration of an embodiment provided with a plurality of stages along the inclined plane direction, (a) shows a plan view, (b) shows a cross section in a direction orthogonal to the inclination direction, and (c) shows a cross section in the inclination direction Illustrated.
Fig. 5 shows the provision of floc forming inclined plates for floc formation in the case where the number of stages of the openings along the inclined plate direction is set to 0, 1, 2 and 3 after the floc forming inclined plate is provided in the sedimentation treatment tank. The graph which shows the situation in which the reduction ratio (削減 率) with respect to the state which does not have changes is shown.
In addition, the number in a figure shows the following structural parts.

As shown in the plan view of FIG. 1, the basic configuration is that the opening 2 having the upper side and the lower side is disposed along the inclined surface in one or more stages as shown in the plan view of FIG. 1. .

The number of the openings 2 in the direction orthogonal to the inclined surface may also employ both the one case and the plural cases along the direction, but the number of the openings 2 in the direction and the number of the inclined plates 11 in the direction are the same. It depends on the width of (2).

In any case, when the target water collides with the upper side, when the treated water flows in the upper end of the upper side and the upper side thereof, as in the case of the lower end of each inclined plate 11 and the upper side thereof. In the region where local turbulence and / or vortex occurs, and the turbulence and / or vortex occur, collision between miflocs occurs frequently, thereby promoting flocculation.

Although the shape of the opening part 2 is a rectangular shape in many cases as shown to FIG. 1 (a), it is not limited to a rectangle, It is a triangle shape shown to FIG. 1 (b), and it shows to FIG. 1 (c). Naturally, also in the semicircle shape to be used, it can employ | adopt another shape also.

In the case of the rectangular shape shown in Fig. 1 (a), for example, as shown in Fig. 3 (a), one rectangle is formed in a direction orthogonal to the inclination direction, and the turbulence and It is possible to realize a wide range of vortices.

On the other hand, in the case of the said triangular shape and semi-circle shape, in general, a plurality of cases are usually provided in the orthogonal direction, but the length of the upper side where the turbulence and / or the vortex occurs in the opening 2 per rectangle is rectangular. Since it is longer than in the case of a shape, this may also contribute to the formation of efficient turbulence and / or vortex.

Although the opening part 2 is provided for each inclination plate 11, as an arrangement state of each inclination plate 11, as shown in FIG.2 (a), the height position of the opening part 2 to each inclination plate 11 is adjusted. Although the embodiment characterized by setting similarly is employ | adopted as a typical example, as shown in FIG.2 (b), in one pair of floc forming inclination plates 1 adjacent to each other, Embodiments in which the height position where the opening 2 of the inclined plate 1 is formed and the height position where the inclined surface of the other floc forming inclined plate 1 is formed correspond to each other and are set in the same manner can also be adopted. .

However, the arrangement | positioning state of the opening part 2 for each inclination board 11 can employ | adopt various forms, and is not limited to the case of FIG. 2 (a), (b).

In the case of FIG. 2 (a), in the height direction region where the openings 2 are formed in relation to each of the inclined plates 11, a state in which no inclined surface based on the predetermined pitch width is formed is generated. Therefore, in order to cover such a state, it is suitable for the said floc forming inclination board 1 with a narrow pitch width.

On the other hand, in the case of FIG. 2 (b), twice the pitch width is formed by the inclined surface located next to both sides of the area | region of the height direction in which the opening part 2 is formed, and FIG. Since there is no region in the height direction where no inclined surface as in the embodiment of Fig. 1 exists, it may be suitable for the case of a pitch width wider than that in the case of FIG.

In order to set a predetermined pitch width, in the present invention, the inclined surface of each inclined plate 11 located along the inclined surface is in contact with the inclined surface from the upper end or the vicinity of the inclined plate 11 to the lower end or the vicinity thereof. An embodiment can be adopted in which a plurality of protrusions 3 are provided in a direction orthogonal to the inclined surface.

While the pitch width is defined by the degree of protrusion of the protrusion 3, it is possible to reinforce the strength of the floc forming inclined plate 1 that the respective inclined plates 11 do not bend along the inclined plane direction.

The straight protrusion 3 shown in FIG. 3 (a) is suitable for a simple and rapid manufacturing process.

On the other hand, in the meandering protrusion 3 of FIG. 3 (b), the to-be-processed water collides with the protrusion 3, and can contribute to the formation of turbulence and / or vortex.

In the precipitation treatment tank employing the floc forming inclined plate 1 based on the present invention, efficient flocculation and flocculation sedimentation treatment can be promoted. When the amount of the inorganic flocculant in the inorganic coagulant injection step is limited to 50 mm or less, and the turbidity after passing the treated water becomes 4/5 compared to the turbidity before passing through the inclined plate 1 for flocculation. Since the number of miflocs can be reduced and the density of floc particles can be set high, the outstanding flocculation sedimentation process can be implement | achieved with the effect of the floc forming inclination plate 1 of this invention.

Example

Hereinafter, it demonstrates based on an Example.

Example 1

In the embodiment, as shown in Figs. 4A, 4B, and 4C, in each of the inclined plates 11, a region in which the opening 2 does not exist or a region spanning the opening 2 is shown. In the present invention, a plurality of projection-shaped recesses 4 contacting the inclined surface of each inclined plate 11 located next to each other are provided in a direction orthogonal to the inclined surface direction, and a plurality of stages are provided along the inclined surface direction. have.

In the above embodiment, the projection-shaped concave portion 4 itself not only defines the pitch width, but also, among the protruding portions accompanying the formation of the concave portion, the lower outer wall collides with the treated water rising along the inclined surface, Different turbulence and / or vortex may be formed than the opening 2.

Furthermore, as in the case of the protrusion 3, the strength of each inclined surface may be reinforced.

On the other hand, in FIG.4 (a), (b), the reinforcement protrusion tank 5 provided along the inclined surface direction between the projection-shaped recessed parts 4 of both sides is the protrusion tank 3 shown in FIG. Although not in contact with the inclined surface of each inclined plate 11 located next to), it aims to ensure the bending strength in the inclined surface direction, and exhibits the same function as the protrusion 3 in this respect. Doing.

In each embodiment of FIG. 4, the position of the lower end of the bottom surface of the projection-shaped recessed part 4 is a boundary with the said inclined surface in the projection-shaped recessed part 4 of the inclined board 11 located next. Although the form which matches the position of an upper edge is employ | adopted, in the case of such a design, the to-be-processed water which collided with the lower wall part of the projection surface downward from the projection-shaped recessed part 4 of each inclination plate 11 was carried out. Can also collide with the upper inner wall of the protruding surface downward of the protruding recess 4 formed on the inclined surface located next to it, and can further contribute to the formation of turbulence and / or vortex.

In Figs. 4A, 4B, and 3C, the projection-shaped recesses 4 are provided in regions where the openings 2 are not formed, but in the region spanning the openings 2 along the inclined plane direction. The installation example is also naturally possible, and even in this case, complicated turbulence and / or vortex can be formed.

In each inclined plate 11 of the above embodiment, the width in the inclined plane direction is 0.8 m, the width in the orthogonal direction is 1.46 m, the width in the inclined plane direction is 4 cm, and the width in the orthogonal direction is 8.6 cm. When the openings 2 having a rectangular shape are not provided, and when the openings 2 are arranged in one row at the central portion in the height direction along the inclined plane direction, two rows are evenly arranged, three rows are evenly arranged. Then, the floc forming inclination plate 1 which made each inclination plate 11 into the pitch width of 23 pieces 10 mm was created, respectively.

In the inorganic coagulant injection step, the injection rate of 20 mg / L of kaolin and PAC is set to 18.9 mg / L, and as a non-flocification step, rapid agitation tanks in three compartments are employed, followed by agitation strength in each rapid agitation tank. Phosphorus G _R value, that is, the stirring coefficient is C, the area of the stirring blade is A (m 2), the peripheral speed of the stirring blade is m / sec, and the kinematic viscosity coefficient is γ. (M2 / sec) and when the volume (capacity) of the stirring vessel is set to V (m 3),

[1]

Mifloc particles based on the above-mentioned agitation strength were set in a coagulation sedimentation treatment tank having a cubic shape of 5m × 5m × 5m with a numerical value expressed by 150 sec ⁻¹ and a surface load ratio of 52.0 mm / min. By flowing in, the flocking process was realized.

In the flocculation sedimentation treatment tank, when the floc formation inclination plate 1 is not provided, the opening 2 is not provided as described above after the floc formation inclination plate 1 is provided on the top of the flocculation precipitation treatment tank. The rate of reduction of the particles in the range of diameters in the case of the non-floc forming inclined plate 1, that is, the opening 2 is 0, 1, 2, 3, that is, the inlet in the coagulation sedimentation tank The extent of the increase of the reduction rate of the particle | grains of each area | region range at the side and an exit side is as showing in the graph of FIG.

As is also clear from the graph, as the number of the openings 2 along the inclined plane direction increases, the reduction rate of the particles in each area range is improved, but in particular, the larger the particle diameter, the better the reduction rate.

The present invention can be used in all fields of sewage using an inorganic flocculant and in the mud treatment industry.

1: inclined plate for floc formation
11: each inclined plate
2: opening
3: protrusion
4 projection shape recess
5: reinforcement protrusion tank

Claims (10)

By an inorganic flocculant injection step of injecting an inorganic flocculant into the water to be treated and an unflocculation step of mixing and stirring the treated water into which the inorganic flocculant is injected in a rapid stirring tank to pre-flolocate the fine suspended particles in the treated water. A precipitation treatment tank including a flocculation step including a step of further flocculating the formed floc particles by contact with existing floc particles and a precipitation separation treatment step for the floc particles. A floc forming inclined plate, comprising: an inclined plate for forming a floc, the opening having an upper side and a lower side along a direction orthogonal to the direction of the inclined surface. 2. The floc forming inclined plate according to claim 1, wherein the height position of the opening portion in each inclined plate is set equal. 2. The height position at which the opening of one of the floc forming inclination plates is formed and the height position at which the inclined surface of the other floc forming inclination plate is formed The inclined plate for floc formation which mutually corresponds and is set the same. The inclined plate for forming flocs according to any one of claims 1, 2, and 3, wherein any one of a rectangular shape, a triangular shape, and a semicircular shape is adopted as the opening portion. The inclination surface of each inclination plate of any one of Claims 1, 2, 3, and 4 in the area | region which does not exist in the inclination plate, or the area | region which spans the opening. A plurality of projection-shaped recesses in contact with each other are provided in a direction orthogonal to the inclined plane direction, and a plurality of stages are provided along the inclined plane direction. 6. The position of the lower end of the bottom surface of the projection-shaped recessed portion coincides with the position of the upper end edge bordering the inclined surface in the projection-shaped recessed portion of each inclined plate located next to each other. Inclined plate for floc formation. The inclined surface of each inclined plate of any one of Claims 1, 2, 3, and 4 along the inclined surface from the upper end or its vicinity to the lower end or its vicinity. The inclined plate for floc formation characterized by the plural protrusion protrusions provided along the direction orthogonal to a slope. 8. The floc forming inclined plate according to claim 7, wherein the protrusions are straight or meandering. Midway to reach the top or the top of the inclined plate for forming a floc according to any one of claims 1, 2, 3, 4, 5, 6, 7, and 8. Agglomeration sedimentation treatment tank installed in the site. The said inorganic weapon in an inorganic coagulant injection | pouring process of Claim 9 which makes pitch width 5 mm or more and 50 mm or less so that turbidity after passing may be 4/5 compared with turbidity before passing through the inclination plate for floc formation. A flocculation settling tank characterized in that the amount of flocculant is limited.

Images