KR101658044B1

KR101658044B1 - Advanced treatment apparatus

Info

Publication number: KR101658044B1
Application number: KR1020160012548A
Authority: KR
Inventors: 심상조; 김규형; 방기웅; 양승호; 심상천; 송대현; 이명진; 이준호
Original assignee: 주식회사 경우크린텍
Priority date: 2015-01-30
Filing date: 2016-02-01
Publication date: 2016-09-21
Also published as: KR20160094883A

Abstract

An advanced treatment apparatus using a double HydroCycrone is disclosed.
The apparatus for advanced treatment according to the present invention comprises a coagulant input facility for inputting coagulant into inflow water; An internal hydrocyclone and an external hydrocyclone containing the internal hydrocyclone, wherein the flocculation reaction for rapidly mixing the influent and the flocculant and the coagulation reaction for reacting the flocculant with the influent mixed with the flocculant to raise the floc A double hydrocyclone is performed; And a sedimentation tank for separating the supernatant and the flock formed through the double hydrocyclone.

Description

{ADVANCED TREATMENT APPARATUS}

The present invention relates to an advanced treatment apparatus for secondary effluent (effluent) of a sewage treatment plant, and more particularly, to an effluent quality standard (not more than 0.2 mg / L) The present invention relates to an advanced treatment apparatus using a double HydroCycrone.

Since the conventional biological treatment process can not satisfy the concentration of 0.2 mg / L or less of the effluent water quality standard of the total person, a separate chemical treatment process is required to precipitate and remove the total phosphorus by injecting coagulant. Most of the chemical coagulation and sedimentation processes consist of a flocculation tank for mixing the influent and the flocculant rapidly, a flocculation tank for reacting the mixed influent and the flocculant to raise the floc, and a settling tank for separating the formed floc and the supernatant.

Figure 1 shows an advanced treatment apparatus using a conventional chemical coagulation sedimentation process.

Referring to FIG. 1, an advanced treatment apparatus using a conventional chemical coagulation sedimentation process includes a coagulant input facility 10, an agglomeration / condensation tank 20, and a sedimentation tank (or slope plate sedimentation tank) 30. Each reactor requires a stirrer for rapid and slow stirring.

The coagulant feeder installation (10) is connected to the coagulation / condensation tank (20). The flocculant input facility 10 is composed of a pump capable of injecting the flocculant storage tank and the flocculant quantitatively.

The coagulation / condensation tank 20 includes a condensation tank for rapidly mixing the influent and the flocculant, and a condensation tank for reacting the flocculant with the influent mixed with the flocculant to raise the floc.

The settling tank 30 is for separating the formed flocs and the supernatant.

The effluent tank 100 of FIG. 1 stores the final effluent of the sewage treatment facility, that is, discharged water. Normally, treated water is discharged to the water system by the natural descent method in the discharge tank. However, the water is sent to the filtration facility for the tertiary treatment,

However, in the conventional advanced treatment apparatus as shown in FIG. 1, a flocculation tank and a coagulation tank are required, and each tank requires a power plant for stirring chemicals and treatment water.

Also, since a certain residence time must be ensured for coagulation and condensation, the volume of coagulation and coagulation tank should be increased proportionally as the flow rate increases.

In addition, since the required site and volume of the coagulation tank and the coagulation tank must be considerably large, the selection of the installation site is limited, the cost for the coagulation tank and the coagulation tank is considerable, and the system is problematic in terms of maintenance (failure).

As a background related to the present invention, there is a cyclone type sewage treatment apparatus for removing total phosphorus in sewage treatment water disclosed in Korean Patent Laid-Open Publication No. 10-2012-0046808 (published on May 11, 2012).

The sewage treatment apparatus disclosed in the above document includes a line mixer into which wastewater treatment water is introduced, a flocculating agent and granular activated carbon as coagulation assistants are introduced and rapidly mixed therewith; A sedimentation tank in which a lower end is formed in a cyclone form and a sludge is precipitated when the wastewater treatment water mixed with the flocculant and the granular activated carbon flows into the upper side from the line mixer, And a separation membrane that is formed in a shape in which the lower end is narrowed and a separation membrane is installed therein to filter and discharge the supernatant discharged from the sedimentation tank.

In the case of the above document, a single cyclone structure is proposed, and solid-liquid separation is performed in a cyclone.

Even if the mixing is performed not in solid-liquid separation from the cyclone, since the reaction zone is short, the mixing efficiency of the coagulant and the wastewater treatment water is not high. A structure in which two single cyclones are connected in series to prolong the reaction period may be proposed. In this case, there is a problem that the volume of the sewage treatment apparatus increases accordingly. In addition, only one of rapid mixing and slow mixing is possible by a single cyclone. When only rapid mixing is performed, the flocculation effect due to the slow mixing is insufficient, so that the size of the flocculant is difficult to increase and it is difficult to effectively induce flocculation and condensation reaction. On the other hand, when only the slow mixing is performed, the mixing time of the coagulant and the wastewater treatment water becomes long, and the sewage treatment efficiency is low.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an improved advanced treatment apparatus capable of alleviating restrictions and burdens due to coagulation baths and coagulation baths.

According to another aspect of the present invention, there is provided an elevation treatment apparatus for separating phosphorus contained in influent water by injecting a coagulant into the influent water to cause flocculation and condensation reaction, comprising: a flocculant input facility for introducing the flocculant into the influent water; An internal hydrocyclone and an external hydrocyclone containing the internal hydrocyclone, wherein the flocculation reaction for rapidly mixing the influent and the flocculant, and the condensation reaction for reacting the flocculant with the influent mixed with the flocculant, A double hydrocyclone wherein the reaction is carried out; And a sedimentation tank for separating the floc and the supernatant from the lower drainage water and the effluent discharged from the double hydrocyclone.

Here, the double hydrocyclone includes an internal hydrocyclone in which influent water flows in a spiral direction, and an external hydrocyclone which contains the internal hydrocyclone and the effluent of the internal hydrocyclone flows in a spiral direction.

Preferably, the inner hydrocyclone includes an upper cylinder portion and a lower cone portion, wherein the diameter of the cylinder portion is 75 mm or more. When the diameter of the cylinder portion is 75 mm or more, the throughput can be remarkably increased.

Preferably, the outer hydrocyclone includes an upper cylinder portion and a lower cone portion, wherein the diameter of the cylinder portion is 2.5 to 3.5 times the diameter of the cylinder portion of the inner hydrocyclone.

At this time, the rate at which the effluent of the internal hydrocyclone flows into the external hydrocyclone is slower than the rate at which the influent containing the flocculant enters the internal hydrocyclone. Due to the difference in the rotational speeds of the internal hydrocyclone and the external hydrocyclone, the influent water and the flocculant are rapidly mixed due to the relatively strong vortex in the internal hydrocyclone, and relatively weak in the external hydrocyclone Due to the vortex, slow mixing can be achieved.

Here, it is preferable that the lower drainage water discharged from the double hydrocyclone is injected into the double hydrocyclone so that the flocculated / condensed flocs in the lower drainage water act as nuclei so as to promote the flocculation / condensation reaction.

In the advanced treatment apparatus according to the present invention, since the double hydrocyclone is subjected to coagulation reaction and condensation reaction only by pressure feeding by a pump, the driving part of the agitation apparatus and the like can be reduced, which is economical.

In addition, since the advanced treatment apparatus according to the present invention can be applied to a considerably small area compared to the existing site and volume of the chemical flocculation tank and the coagulation tank, it is advantageous in terms of cost reduction and maintenance with a simple and compact process structure.

Figure 1 shows an advanced treatment apparatus using a conventional chemical coagulation sedimentation process.
2 shows an apparatus for advanced treatment using a double hydrocyclone according to the present invention.
Figure 3 illustrates the construction and operation of an internal hydrocyclone (HC).
Fig. 4 shows the construction of the double hydrocyclone shown in Fig. 2. Fig.
Figures 5 and 6 show cross sections of an internal hydrocyclone and a double hydrocyclone, respectively.
FIG. 7 shows the change in the throughput Q according to the diameter of the inner hydrocyclone having the structure of FIG.
8 shows the change in the throughput Q with respect to the cylinder diameter of the external hydrocyclone.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, the double hydrocyclone (DH) is used instead of the flocculation tank and the coagulation tank of the conventional chemical treatment process to mix the inflow water and the flocculant at high speed in the internal hydrocyclone, In the hydrocyclone, it is characterized in that the size of the flocs is increased by the coagulation action by the slow mixing to induce the flocculation and condensation reaction effectively, and the total phosphorus can be treated through the precipitation process at the subsequent stage.

2 shows an apparatus for advanced treatment using a double hydrocyclone according to the present invention.

Referring to FIG. 2, the apparatus for advanced treatment according to the present invention comprises a coagulant input facility 10, a double hydrocyclone 40, and a settling tank 30. 2 shows the use of a swash plate settling tank, a usual settling tank may be used.

The effluent tank 100 stores the final effluent of the sewage treatment facility, that is, effluent water. Normally, treated water is discharged to the water system by the natural descent method in the discharge tank. However, the water is sent to the filtration facility for the tertiary treatment,

In the case of the present invention, the effluent water is stored in order to transfer the effluent water to the double hydrocyclone 40 through the pump.

Hydrocyclone (HC) is a device capable of separating particles and solid liquid using centrifugal force and gravity through strong vortex. It can operate with high water surface area load ratio, no driving part, And is utilized in various industrial fields.

In the present invention, the hydrocyclone is used as a mixing device capable of maximizing the mixing of substances introduced through a strong vortex generated in a device, not a device for solid-liquid separation of particles.

The present invention relates to a method and apparatus for mixing coagulant and influent water at a high speed using a double hydrocyclone (DH) manufactured in duplicate instead of the coagulation tank and coagulation tank of the conventional chemical treatment process, By increasing the size of the flocs by the condensation action, it is possible to effectively induce flocculation and condensation reaction, thereby processing the total phosphorus through the subsequent precipitation process.

In addition, by injecting the underflow of the double hydrocyclone into the inlet, the coagulated flocs are provided as agglomerated nuclei to accelerate agglomeration and condensation reaction, thereby enhancing efficiency of solid-liquid separation in the precipitation process.

3 is a view showing the construction and operation of an internal hydrocyclone (HC) applied to the present invention.

An internal hydrocyclone (HC) includes a cone portion having a cylinder portion at the top and a conical internal space. The inflow water (eg, high concentration turbid water) pumped through the pump flows through the inflow pipe. At this time, the influent water flows into the cylinder portion and flows into the succeeding conical internal space in the spiral direction to form a strong rotational current.

The diameter of the cylinder portion and the height of the cylinder portion may be approximately the same, and the height of the cone portion may be approximately three times the diameter of the cylinder portion. The diameter of the cylinder portion of the external hydrocyclone is preferably 2.5 to 3.5 times, more preferably 3 times the diameter of the cylinder portion of the internal hydrocyclone. When the diameter of the cylinder of the external hydrocyclone is 2.5 times or more the diameter of the cylinder of the internal hydrocyclone, the effect of the double hydrocyclone can be sufficiently exhibited. Even if the volume of the external hydrocyclone is 3.5 times or more, It does not improve. On the other hand, the diameter of the cylinder portion of the external hydrocyclone and the height of the cylinder portion may be approximately the same, and the height of the cone portion may be approximately three times the diameter of the cylinder portion.

On the other hand, as a result of experiments, the diameter of the cylinder portion has a great influence on the throughput.

Table 1 and Fig. 7 show changes in throughput (Q) according to the cylinder diameter of the internal hydrocyclone having the structure of Fig. In Table 1 and FIG. 3, D_Cylinder is the cylinder diameter, H_Cylinder is the cylinder height, and H_Cone is the concave height. The cylinder diameter of the external hydrocyclone is three times the cylinder diameter of the internal hydrocyclone.

[Table 1]

Referring to Table 1 and FIG. 7, it can be seen that the throughput Q increases as the cylinder diameter increases. This is because as the diameter of the cylinder increases, the total volume of the hydrocyclone increases and thus the time the inflow water remains is further increased

In particular, it can be seen that the slope when the diameter of the cylinder portion is 75 mm or more is larger than the slope of the cylinder portion having the diameter of 75 mm, which shows that the throughput is significantly increased with the diameter of the cylinder portion being 75 mm. Therefore, the diameter of the cylinder portion is preferably 75 mm or more, and if the size is excessively large, the apparatus design cost can be excessively increased, and more preferably 75 to 110 mm.

8 shows a change in the throughput Q according to the cylinder diameter of the external hydrocyclone. The diameter of the cylinder part of the inner hydrocyclone is 1/3 times the diameter of the cylinder part of the external hydrocyclone.

Referring to FIG. 8, it can be seen that the slope of the cylinder diameter of the external hydrocyclone is larger than that of the cylinder diameter of 225 mm (cylinder diameter of the internal hydrocyclone: 75 mm) have. Accordingly, the diameter of the cylinder portion of the external hydrocyclone is preferably 225 mm or more, more preferably 225 to 330 mm.

Fig. 4 shows the construction of the double hydrocyclone shown in Fig. 2, and Figs. 5 and 6 show cross sections of the inner hydrocyclones and the double hydrocyclones, respectively.

4, the double hydrocyclone 40 includes an internal hydrocyclone 42 and an external hydrocyclone 44, and the internal hydrocyclone 42 includes an external hydrocyclone 44, do. That is, the internal hydrocyclone 42 is installed inside the external hydrocyclone 44. Further, although not shown, the lower drainage water of the double hydrocyclone 40 is re-injected into the inlet portion.

As shown in FIG. 4, a double hydrocyclone (DH) contains a small amount of HC in a general HC.

The inflow water supplied from the discharge tank 100 flows into the inner wall of the inner hydrocyclone 42 through the inlet of the inner hydrocyclone 42 as an involute feed to maximize generation of vortex . Here, effluent and flocculant are strongly mixed. The effluent discharged from the outlet of the internal hydrocyclone 42 is introduced into the external hydrocyclone 44 by the induction plate 44a so that it can flow in the spiral direction to help the vortex formation.

As the discharged water rotates through the space between the outer tube of the external hydrocyclone 44 and the partition wall 44b, the particles in the discharged water and the flocculating agent coagulate to form a flock. The formed flocs flow out to the lower discharge portion of the double hydrocyclone 40 and are recycled to the inlet pipe. In this process, the flocculated flocculant acts as nuclei necessary for effluent agglomeration and maximizes flocculation effect. The particles agglomerated and agglomerated and condensed in the external hydrocyclone 44 via the internal hydrocyclone 42 and a part of the process water are discharged to the lower discharge portion and recycled to the inlet pipe while the remainder is discharged to the outlet of the external hydrocyclone 44 And is sent to the settling tank 30.

The treated water flowing out through the outlet of the external hydrocyclone (44) is transferred to the settling tank (30).

In the internal hydrocyclone 42, strong vortex is generated due to the pressure (pressure) of the inflow pump, rapid mixing (coagulation) occurs, and the upper drainage water of the internal hydrocyclone 42 flows into the external hydrocyclone 44 again And gradually stirs (coagulates) slowly. Since the diameter of the external hydrocyclone 44 is larger than that of the internal hydrocyclone 42, a difference occurs in the rotational speed of the influent water in the external hydrocyclone 44 and the internal hydrocyclone 42, The rapid stirring and the slow stirring are performed by the difference in the rotational speed.

On the other hand, a part of the lower drainage water of the double hydrocyclone 40 is mixed with the discharge water provided in the discharge tank 100 and re-injected into the double hydrocyclone 40 again. As a result of this re-injection, the coagulated and condensed flocs in the lower drainage water act as condensation nuclei, thereby promoting the flocculation and coagulation reaction between the effluent flowing into the double hydrocyclone 40 and the flocculant. In the double hydrocyclone (40), the remaining treated water other than the lower drain water is transferred to the settling tank (30).

Generally, the discharged water, which is formed by the rapid mixing in the internal hydrocyclone 42 and the slow mixing in the external hydrocyclone 44 and the re-injection of the lower drainage sludge of the double hydrocyclone 40, Is discharged to the effluent portion of the cyclone 40 and is sent to the precipitation process, and the phosphorus (P) is finally removed through solid-liquid separation in the sedimentation tank (or the slag plate sedimentation tank).

The coagulation and coagulation method using the double hydrocyclone in the advanced treatment apparatus according to the present invention has a small size and small volume compared with the conventional method and the centrifugal force and gravity of the internal hydrocyclone Mixing action (aggregation) occurs.

On the other hand, since the condensation reaction takes place outside the hydrocyclone, it is considered to be an effective means for replacing existing facilities. Further, since the coagulated flock can be provided as a coagulated nucleus by recycling the coagulated flock through the lower discharge portion of the double hydrocyclone, it can be more effectively used as the coagulation aid besides the coagulant.

100 ... discharge tank
10 ... coagulant input facility
20 ... coagulation / coagulation tank
30 ... sedimentation tank
40 ... double hydrocyclone

Claims

A coagulant input facility for introducing a coagulant into the influent;
An internal hydrocyclone into which the influent water containing the flocculant flows in a spiral direction; and an internal hydrocyclone containing the internal hydrocyclone and flowing in the direction of the spiral of the internal hydrocyclone, And an external hydrocyclone into which the internal hydrocyclone is slowly introduced, wherein a condensation reaction for rapidly mixing the influent and the flocculant is performed, and a condensation reaction for growing the floc by reacting the mixed water with the flocculant is performed, And the external hydrocyclone, the inflow water and the flocculant are rapidly mixed due to the relatively strong vortex in the internal hydrocyclone due to the difference in the rotational speed of the external hydrocyclone, and the relatively weak vortex in the external hydrocyclone, More to be done Hydrocyclone; And
And a sedimentation tank for separating the supernatant and the flock formed through the double hydrocyclone,
Wherein the inner hydrocyclone includes an upper cylinder portion and a lower cone portion, wherein the diameter of the cylinder portion is 75 to 110 mm,
Wherein the outer hydrocyclone includes an upper cylinder portion and a lower cone portion, wherein the diameter of the cylinder portion is 2.5 to 3.5 times the diameter of the cylinder portion of the inner hydrocyclone.

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The method according to claim 1,
Wherein the lower drainage water discharged from the double hydrocyclone is injected into the double hydrocyclone so that the flocculated / condensed flocs in the lower drainage water acts as a nucleus so as to promote the flocculation / condensation reaction.

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