JP2005305271A - Apparatus for treating polluted water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for treating polluted water, in which a power source for mixing polluted water with a flocculant is not required and polluted water can be mixed satisfactorily with the flocculant in a short time without causing the polluted water to take a short pass. <P>SOLUTION: This apparatus for treating the polluted water is composed of a flocculant adding/mixing tank in which the flocculant is added to/mixed with polluted water to flocculate a polluted material and a polluted material separating tank for settling/separating the flocculated polluted material. The flocculant adding/mixing tank is composed of a flocculant adding tank equipped with a polluted water supplying port, a flocculant adding tool and a polluted water discharging port and a cylindrical mixing tank having such a slope that the flowing-in flocculant-added polluted water is made to flow down naturally and such a curved structure that a turbulent flow is generated by meandering the flow of the flocculant-added polluted water. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a polluted water treatment apparatus for purifying by adding a flocculant to polluted water, mixing them to agglomerate pollutants, and precipitating and separating them.
More specifically, rainwater that has fallen on the ground, muddy water mixed with mud in the groundwater that oozes out of the ground due to tunnel construction and civil engineering work, etc., or water in sewage, drainage, polluted rivers and lakes, The present invention relates to a polluted water treatment apparatus for purifying by adding a flocculant to the polluted water accumulated at the bottom of a dam, causing the polluted substances to aggregate, precipitating and separating.

Conventionally, if a fine powdery flocculant is added to contaminated water to mix and disperse, the fine powder flocculant is prone to lumps, and only a simple stirring operation produces a fine powder. It has a property that it is difficult to sufficiently mix the flocculant in the form of a polluted water.
Therefore, in order to sufficiently stir, mix and disperse the contaminated water and the powdery flocculant, it is necessary to stir and mix with a motor-equipped stirring blade in an appropriate time.
Therefore, as a sewage treatment equipment for adding and mixing flocculant to contaminated water such as sewage to agglomerate suspended substances, precipitate, separate and purify, generally agglomerate in contaminated water. This is formed from a stirring and mixing tank that adds an agent and stirs and mixes with a stirring blade equipped with a motor, a floc forming tank that aggregates suspended substances to form a floc, and a precipitation tank that precipitates by allowing the floc to stand. It was normal (for example, refer patent document 1).

  In addition, a fouling treatment apparatus in which a floc-forming tank equipped with a flocculant charging machine and a stirrer and a sedimentation tank that settles by allowing the floc to settle are connected by a bent hose and the mixed liquid is transferred by a sand pump. It is known (see, for example, Patent Document 2).

  Furthermore, when transferring polluted water such as sewage stored in the raw water tank to the slow stirring tank by the power of the pump, an inlet for injecting the inorganic flocculant into the pipe in the middle and a mixing and stirring device are provided. After mixing with the inorganic flocculant, the polymer flocculant is injected into the slow stirring tank, mixed and stirred, then transferred to the coagulation sedimentation tank by the power of the pump and left to stand to precipitate the aggregate. A separation treatment system for separation is also known (see, for example, Patent Document 3).

JP-A-10-235398 (FIGS. 1 and 2) JP 2000-31805 A (FIG. 1) JP 2002-307071 (FIG. 1)

However, in the sewage treatment apparatus, a stirring source with a motor is required for the stirring and mixing tank for stirring and mixing with the flocculant, and therefore a power source is required, and such a stirring and mixing tank is large. In addition, it is difficult to perform sufficient mixing, and it is necessary to add more flocculant than necessary, so that there is an economical problem that a large amount of flocculant is required.
In addition, in a pollution treatment apparatus in which a floc forming tank equipped with a flocculant charging machine and a stirrer and a precipitation tank are connected by a bent hose, a floc separation tank is formed by a sand pump from the bottom of the stirring and mixing tank for stirring and mixing with the flocculant. Therefore, a power source for that purpose is required, and even if the floc formed by mixing thoroughly in the floc forming tank equipped with a stirrer is transferred with a bent hose, the mixing effect There was a problem that there was no change.
Furthermore, when transferring the polluted water such as sewage stored in the raw water tank to the slow stirring tank, injecting an inorganic flocculant in the middle of the pipe or mixing and stirring with a mixing and stirring apparatus, In a turbid water treatment system in which a polymer flocculant is injected, stirred and mixed with a mixer equipped with a stirring blade, and further transferred to a coagulation sedimentation tank and allowed to stand and separate, there are two types of inorganic flocculants and polymer flocculants. Because it uses a flocculant, it must be mixed with a mixer equipped with a stirring blade after adding two types of flocculants, so that it cannot be transferred to a coagulation sedimentation tank and allowed to stand and separate. There was a problem that the same effect as the sewage treatment apparatus could not be obtained.

  As a result of intensive studies in view of the above problems, the present inventor has sufficiently mixed the contaminated water and the flocculant with a small power source, and does not need to add and mix other types of flocculants many times. Unlike the conventional tank-type agitation and mixing device, if the flocculant is added to the polluted water and it is allowed to flow naturally in the cylindrical body to cause turbulent mixing, the supplied polluted water remains inadequately mixed. The so-called short path that is transferred to the separation tank does not occur, so that the polluted water and the flocculant can be sufficiently mixed in a short time, and it can be industrially miniaturized. Based on this, the present invention has been completed.

  That is, the polluted water treatment apparatus of the present invention includes a flocculant addition / mixing tank for aggregating the pollutant suspended in the polluted water by adding the flocculant to the polluted water and mixing, and sedimenting the aggregated pollutant In the polluted water treatment apparatus comprising a pollutant separation tank that separates the flocculant, the flocculant addition / mixing tank includes a polluted water supply port, a flocculant adder, and a flocculant-added polluted water discharge port. The flocculant addition tank, the inlet side connected to the flocculant addition tank, and the outlet side connected to the pollutant separation tank for sedimenting and separating the aggregated pollutant, the flocculent flowed from the inlet The additive-added polluted water has a slope for naturally flowing down, and is composed of a cylindrical mixing tank configured to generate turbulent flow by bending. is there.

Such a contaminated water treatment apparatus of the present invention is stirred and mixed by air bubbles in the cylindrical mixture by causing a turbulent flow by naturally flowing down in the cylindrical body while adding a flocculant to the contaminated water. Unlike conventional tank-type agitation and mixing tanks, the so-called short path where the supplied contaminated water is transferred to the separation tank with insufficient mixing does not occur, and the contaminated water and the flocculant are sufficiently mixed in a short time. be able to.
In addition, by providing a polluted water distributor equipped with outlets with different levels to adjust the flow rate, the polluted water and the flocculant can be flowed at a constant flow rate that produces turbulent flow, so that mixing is possible. It will not be inadequate.
Furthermore, since the mixture of the polluted water and the flocculant is naturally flowed down in the cylindrical mixture to cause turbulence and mixing, there is no need for a power source for agitation and a small power source. There is an advantage that other kinds of flocculants do not need to be added and mixed many times.

[I] Raw materials
(1) Polluted water As the polluted water 2 used in the polluted water treatment apparatus 1 of the present invention, mud is mixed with rainwater that has fallen on the ground, or groundwater that oozes out of the ground due to tunnel construction or civil engineering work. Muddy water or sewage, drainage, polluted river or lake water, or polluted water collected at the bottom of a dam, where fine particles such as inorganic and organic particles are dispersed in the water Anything can be applied.
Among these polluted water, rainwater that has fallen on the ground, muddy water mixed with mud in the groundwater that oozes out from the ground due to tunnel construction and civil engineering work, etc., or sewage, polluted water collected at the bottom of the dam, etc. In particular, it is an apparatus 1 that is optimal for treating rainwater that has fallen on the ground and muddy water mixed with mud in groundwater that oozes out of the ground due to tunnel construction and civil engineering work.

(2) Coagulant As the coagulant 3 used in the polluted water treatment apparatus 1 of the present invention, an inorganic coagulant or polymer coagulant capable of coagulating and precipitating particles dispersed in colloidal form in the polluted water. The well-known flocculant 3 known as an agent etc. can be used.
Inorganic flocculants Examples of the inorganic flocculants include inorganic flocculants such as zeolitic flocculants, aluminum salts such as sulphated sulfate and PAC, and iron salts such as ferric chloride and polyiron.
Polymer flocculant As the polymer flocculant, any of cationic polymer flocculants, anionic polymer flocculants, nonionic polymer flocculants, and amphoteric polymer flocculants can be used. be able to.
Specific examples of cationic polymer flocculants include inorganic salts of acrylic acid polymers such as dimethylaminoethyl methacrylate, dimethylaminoethyl acrylate, and polyacrylamide, chitosan, and polyvinylamidine. Examples of molecular flocculants and nonionic polymer flocculants include polyacrylate polymers, and examples of amphoteric polymer flocculants include acrylic acid polymer inorganic salts.
Among these various flocculants, anionic polymer flocculants, nonionic polymer flocculants, and zeolite flocculants are preferably used, and it is particularly preferable to use zeolite flocculants.

[II] Contaminated Water Treatment Device The polluted water treatment device 1 of the present invention includes a flocculant addition tank 4 for adding the flocculant 3 to the polluted water 2 as shown in FIG. A flocculant addition / mixing tank 6 composed of a cylindrical mixing tank 5 for mixing and aggregating the pollutant suspended in water and the flocculant, and a pollutant separating tank for settling and separating the aggregated pollutant 7 basically.

  FIG. 1 shows an embodiment of the polluted water treatment apparatus 1 according to the present invention. In particular, the spiral cylindrical body 11 has two stages, an upper stage and a lower stage, and the upper spiral cylindrical bodies 11 are formed in two rows. FIG. 2 is a partially cutaway front view of the polluted water treatment device 1 provided with the flocculant addition tank 4 and the polluted water distributor 13 on the upstream side, and FIG. 2 shows the polluted water treatment device 1 taken along the line AA in FIG. 3 is a plan view of the flocculant addition tank 4 and the upper spiral cylindrical body 11 in the upper part of the polluted water treatment apparatus 1 of FIG. 1, and FIG. 4 is a plan view of the polluted water treatment apparatus of FIG. FIG. 5 is a cross-sectional view taken along the line BB in the vicinity of the spiral cylindrical body 11 and the uniform mixing tank 12, and FIG. 5 shows the uniform mixing tank 12 and the lower spiral cylindrical body in the middle part of the polluted water treatment apparatus 1 of FIG. FIG. 6 is a sectional view taken along the line D-D near the lowermost part of the lower spiral cylindrical body 11 of the polluted water treatment apparatus 1 of FIG. 7 is a sectional view taken along line E-E in the vicinity of pollutants separating tank 7 of polluted water treatment apparatus 1 of Figure 1.

(1) Coagulant Addition / Mixing Tank As the coagulant addition / mixing tank 6 constituting the polluted water treatment apparatus 1 of the present invention, a front view of FIG. 1, a right side sectional view of FIG. 2, and an upper plan view of FIG. As shown in FIG. 5, the flocculant supply ports 4a and 4a ′, the flocculant addition devices 4b and 4b ′, the flocculant addition tank 4 provided with the flocculant-added polluted water discharge ports 4c and 4c ′, and the inflow port 5a, the discharge port 5b, a slant θ for naturally flowing down, the length L of which is a cylindrical body 8 which is 10 times or more the diameter D, and the flow rate of the coagulant-added polluted water 9 is It is comprised from the cylindrical mixing tank 5 made into the structure which produces a turbulent flow.

(A) Coagulant addition tank
(a) Contaminated water supply port The above-mentioned contaminated water supply ports 4 a and 4 a ′ are supply ports for supplying the polluted water 2 to the flocculant addition tank 4.
(b) Flocculant Adder The flocculant adders 4b and 4b ′ are devices for adding powdery flocculant 3, and generally supply powder flocculant 3 at a constant flow rate. For this purpose, a device equipped with a screw rotation type feeder is used.
(c) Coagulant-added polluted water discharge port As the coagulant-added polluted water 9 discharge ports 4c and 4c ', the flocculant-added polluted water 9 obtained by adding the flocculant 3 to the polluted water 2 is used as the cylindrical mixing tank 5 It is a mouth for discharging.

(B) Cylindrical mixing tank
(a) Inflow port The inflow port 5a of the cylindrical mixing tank 5 is connected to the flocculant addition tank 4 and is an inlet to which the polluted water 2 mixed with the flocculant 3 is supplied.
(b) Discharge port The discharge port 5b of the cylindrical mixing tank 5 is a port connected to the pollutant separation tank 7 for settling and separating aggregated pollutants.

(c) Shape As shown in FIGS. 1 and 2, the shape of the cylindrical body 8 that is the main body of the cylindrical mixing tank 5 is a turbulent natural flow rate of the polluted water 2 to which the flocculant 3 is added. It is made into the shape which produces.
(i) Length The length L of the cylindrical body 8 is 10 times or more, preferably 30 to 500 times as large as the diameter D so that turbulent flow is likely to occur due to acceleration when naturally flowing down. Particularly preferably, it has a length L of 30 to 300 times, and is usually bent to make it compact.
If the length L of the cylindrical body 8 is too short, mixing is insufficient, and it is necessary to increase the amount of the flocculant 3 added, which is uneconomical. In addition, if the length of the cylindrical body 8 is too long, mixing can be performed sufficiently, but a large apparatus cost is required, and since the pressure loss is large and the processing capacity cannot be increased, it is economical. It is disadvantageous.

(ii) Inclination The cylindrical body 8 is used for naturally flowing down as shown in FIGS. 1 and 2 until the coagulant-added contaminated water 9 flowing in from the inlet 5a is discharged from the outlet 5b. It is necessary to have an inclination θ.
The angle of the inclination θ is generally 0.5 to 30 degrees, preferably 1 to 10 degrees, particularly preferably 2 to 5 degrees.
If the inclination angle θ is too small, the flow rate of the coagulant-added polluted water 9 becomes too slow, making it difficult to mix and reducing the treatment capability, which is economically disadvantageous. Further, if the inclination angle θ is too large, the processing capability increases, but the height of the entire apparatus becomes too large, so that the gantry 10 that supports the apparatus is also enlarged, which is economically disadvantageous.

(iii) Structure for changing the flow velocity The turbulent flow is difficult to be generated only by flowing straight in the cylindrical body 8, and the turbulent flow is generated in the cylindrical body 8 because the contaminated water 2 and the flocculant 3 are difficult to be mixed. For this purpose, the cylindrical body 8 can be sufficiently mixed by changing the flow speed as a structure in which the straight portion 8a and the bent portion 8b are combined.
The bent cylindrical mixing tank 5 is formed in a substantially spiral shape while bending the cylindrical body 8 in some places while inclining, and having a structure in which the straight portion 8a and the bent portion 8b are combined. It is preferable to be formed as a spiral cylindrical body 11 as shown in FIG.

(2) Multistage cylindrical mixing tank
(A) Multi-stage cylindrical body As shown in FIGS. 1 and 2, the cylindrical mixing tank 5 is formed by connecting a plurality of cylindrical bodies 8 in series and uniformly mixing the connecting portions of the cylindrical bodies 8. It is preferable to form the cylindrical mixing tank 5 in which the cylindrical body 8 is formed in a plurality of stages by forming the tank 12.
Although the cylindrical body 8 can be formed in a number of stages, it is preferably formed in 2 to 5 stages, particularly preferably 2 to 3 stages.
By forming the cylindrical body 8 in such a plurality of stages, it becomes possible to install the cylindrical bodies 8 on the upper stage side in parallel in a plurality of rows as described below, so that the processing capability is increased. be able to.

(B) Multi-row tubular bodies The above-mentioned multi-stage tubular bodies 8 are formed by arranging the upper-stage tubular bodies 8 in a plurality of rows in parallel as shown in FIGS. By installing the flocculant addition tank 4 on the upstream side of 8, multiple rows of flocculant addition / mixing tanks 6, each of which is a combination of the flocculant addition tank 4 and the cylindrical mixing tank 5, are provided. It is preferable to do.
The row of the flocculant addition / mixing tank 6 composed of the combination of the flocculant addition tank 4 and the cylindrical mixing tank 5 can be carried out in many rows, but is generally carried out in two to four rows. Is preferred.
In front of each uppermost spiral cylindrical body 11 in the cylindrical mixing tank 5, a flocculant addition tank 4 is installed.
It is preferable to install the upstream cylindrical bodies 8 in a plurality of rows in parallel and to install the downstream cylindrical bodies 8 in a small number of rows.
In the plurality of cylindrical bodies 8 connected in series, it is preferable that the total cross-sectional area of the downstream cylindrical body 8 is larger than the cross-sectional area of the upstream cylindrical body 8.
Thus, by forming the total cross-sectional area of the downstream cylindrical body 8 large, the liquid flowing through the upstream cylindrical body 8 does not fill the downstream cylindrical body 8 with water. Good stirring and mixing can be performed.
Therefore, when the liquid flowing through the upstream cylindrical body 8 fills the downstream cylindrical body 8, the liquid is stirred and mixed by air bubbles present in the downstream cylindrical body 8. This will significantly reduce the situation.

(C) Uniform mixing tank When the upstream cylindrical bodies 8 are installed in parallel in a plurality of rows and the downstream cylindrical bodies 8 are installed in a small number of rows, the upstream cylindrical bodies 8 and the downstream cylinders are arranged. It is preferable to provide the uniform mixing tank 12 between the shaped bodies 8.
By providing the uniform mixing tank 12, the mixing of the flocculant-added contaminated water 9 can be assisted, and the difference in mixing due to time and the difference in mixing due to the rows of the cylindrical bodies 8 on the upstream side can be made uniform.

(D) Contaminated water distributor When installing a plurality of rows with the combination of the flocculant addition tank 4 and the cylindrical mixing tank 5 as one unit, as shown in FIG. 1 and FIG. By installing the polluted water distributor 13 provided with the individual polluted water discharge ports 13a and 13b, the polluted water 2 supplied to the polluted water supply port 4a of the flocculant addition tank 4 is supplied from the polluted water supply port 4a. The amount of polluted water discharge ports 13a and 13b used varies depending on the level of the polluted water 2 supplied, and the amount of polluted water 2 supplied to the polluted water supply port 4a of the flocculant addition tank 4 is adjusted. By doing so, the flow rate can be adjusted.
In the flocculant addition / mixing tank 6 formed by connecting the flocculant addition tank 4 and the cylindrical mixing tank 5 in series, the flocculant addition / mixing tank 6 of the flocculant addition / mixing tank 6 It is preferable that the polluted water 2 supplied to the polluted water supply port 4a is distributed by the polluted water distributor 13 having a plurality of polluted water discharge ports 13a and 13b having different levels.
Moreover, it is preferable that the cross-sectional area of the polluted water discharge ports 13 a and 13 b distributed and supplied by the polluted water distributor 13 is smaller than the cross-sectional area of the cylindrical mixing tank 5 on the downstream side.
Furthermore, the addition amount of the flocculant 3 supplied to the plural rows of flocculant addition tanks 4 and the cylindrical mixing tank 5 of the flocculant addition tank 4 is adjusted by the height of the level of the polluted water 2 in the pollutant water distributor 13. It is preferable.

[III] Pollutant separation tank
(1) Shape As shown in FIGS. 1, 2, and 7, the pollutant separation tank 7 agglomerates the particles of the pollutant 14 by aggregating the pollutant 14 dispersed in the polluted water 2. The pollutant separation tank 7 has a large diameter so as to reduce the flow rate of the flocculant-added polluted water 9 mixed by the cylindrical mixing tank 5 in order to settle and separate by its weight. It is a cylindrical body container.
Since the discharge port 5b of the cylindrical mixing tank 5 is formed so as to contact in the tangential direction of the cylindrical partition wall 15 installed in the pollutant separation tank 7, the discharge port 5b of the cylindrical mixing tank 5 The coagulant-added polluted water 9 discharged from the air becomes a slowly rotating flow along the partition wall 15 of the pollutant separation tank 7.
Therefore, centrifugal force acts on the particles of the polluted pollutant 14 and settles due to its specific gravity, so that the pollutant 14 particles accumulate on the bottom 7 b of the pollutant separating tank 7.
The water from which the pollutant 14 has been removed rotates outside the pollutant separating tank 7 along the inner wall 7a and is discharged to the outside through a discharge port 7c formed at the upper part of the outer periphery.
Further, the particles of the pollutant 14 accumulated in the bottom 7b of the pollutant separation tank 7 are discharged from the pollutant discharge valve 16 provided on the bottom 7b.
The polluted water treatment apparatus 1 of the present invention, which basically comprises a flocculant addition / mixing tank 6 composed of the flocculant addition tank 4 and the cylindrical mixing tank 5, and a pollutant separation tank 7, is a natural fall Therefore, the flocculant addition tank 4 and the cylindrical mixing tank 5 and the flocculant addition / mixing tank 6 and the pollutant separation tank 7 are formed as shown in FIGS. It is supported by the gantry 10.

The present invention will be described more specifically with reference to the following examples and comparative examples.
[I] Evaluation method
(1) Number of cloudy soils The number of cloudy soils was measured by a cloudy soil sensor “TR-30” manufactured by Kasahara Chemical Co., Ltd.

[II] Examples Examples 1 to 5
Sorbic Kaolin "T-24" (Place of Origin: Republic of Korea) limited to 1,000 to 20,000 ppm of muddy soil as shown in Table 1, with a water temperature of 21 ° C and a flow rate of 80 liters / min. As an aggregating agent, an inorganic aggregating agent “EYK FLOCK” TO-1 (only one) manufactured by Nippon Giken Co., Ltd. was added at an addition rate shown in Table 1, and the total height was about 3.7 m. As shown in FIGS. 1 to 7, the uppermost stream side includes a polluted water distributor 13 having two polluted water discharge ports 13a and 13b having different heights, a polluted water supply port 4a, and a flocculant addition device 4b. The flocculant addition tank 4 (with an internal capacity of 0.0043 to 0.0086 m ³ ) is connected to the flocculant addition tank 4 in the middle portion, and the flocculant-added contaminated water 9 that has flowed in from the inflow port. A cylindrical body 8 having an inner diameter of 40 mm and a length of 5,360 mm It is bent in a substantially right angle to form a substantially rectangular shape, and is formed into a spiral by rotating it 6 times in a spiral shape with an inclination of 3 degrees so that the coagulant-added contaminated water 9 of the cylindrical body 8 flows down naturally. The cylindrical body 8 (internal capacity 0.006 m ³ ) and the cylindrical body 8 ′ (internal capacity 0.006 m ³ ) formed in the same shape adjacent to the cylindrical body 8 are composed of two rows. Uniform mixing tank 12 (internal capacity 0.032 m ³ ) in which the first-stage tubular body 8 and the flocculant-added contaminated water 9 flowing out from the first-stage tubular body 8 are gathered and mixed uniformly. The cylindrical body 8 having an inner diameter of 65 mm and a length of 7,040 mm is again bent substantially at a right angle to form a substantially square, and the cylindrical body 8 flows out of the uniform mixing tank 12. The second-stage cylindrical body formed into a spiral shape by rotating it 6 times in a spiral with an inclination of 3 degrees so that the coagulant-added contaminated water 9 naturally flows down It is composed from (Contents 0.023m ³⁾ and a cylindrical mixing tank 5 flocculant polluted water 9 has a structure that produces a turbulent flow supplied, cylindrical in the lower part of the device 1 On the discharge port 5b side of the mixing tank 5, a polluted water treatment apparatus 1 provided with a pollutant separation tank 7 (with an internal volume of 1.18 m ³ ) having an inner diameter of 1000 mm and a height of 1200 mm for separating and separating the aggregated pollutant substance 14. 10 minutes later, the turbidity number is 9.5 by recovering and separating the pollutant 14 in an amount of 0.39 to 8.02 kg as shown in Table 1 after 10 minutes. A treatment liquid of ˜11.7 ppm was obtained.

Examples 6-10
While changing the flow rate of the turbid water used in Examples 1-5 to the flow rate shown in Table 1, the addition rate of the flocculant 3 is also changed to the addition rate shown in Table 1, and furthermore, the 1st of the cylindrical mixing tank 5 is changed. The same procedure as described in Examples 1 to 5 was performed except that the cylindrical body 8 at the stage was implemented in only one row.
The results are shown in Table 1.

Examples 11-13
The method described in Example 9 except that the water temperature of the muddy water used in Example 9 was changed to muddy water having the water temperature shown in Table 1 and the addition rate of the flocculant 3 was also changed to the addition rate shown in Table 1. As well as.
The results are shown in Table 1.

Examples 14-17
The muddy water used in Examples 6 to 10 was changed to sewage having a turbidity number of 250 to 300 ppm in Tokamachi City, Niigata Prefecture, and the contaminated water was treated under the conditions shown in Table 1.
The results are shown in Table 1.

The polluted water treatment apparatus of the present invention causes turbulent flow by naturally flowing down in a cylindrical body, and is stirred and mixed by air bubbles in the cylindrical body. Therefore, unlike the conventional tank-type stirring and mixing tank, stirring is caused. It is possible to operate with a small power source without the need for a power source, and without causing a so-called short path in which the supplied contaminated water is transferred to the separation tank with insufficient mixing. The flocculant can be sufficiently mixed in a short time.
In addition, by providing a distributor equipped with outlets of different levels to adjust the flow rate, the polluted water and the flocculant can be flowed at a constant flow rate at which turbulent flow occurs, so that mixing is not necessary. Since it has advantages such as not being sufficient, it is industrially superior.

FIG. 1 is a partially cutaway front view of a polluted water treatment apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the contaminated water treatment apparatus according to the embodiment of the present invention taken along line AA. FIG. 3 is a plan view of the upper flocculant addition tank and the upper spiral cylindrical body of the polluted water treatment apparatus of FIG. 1. 4 is a cross-sectional view taken along the line BB in the vicinity of the spiral cylindrical body and the uniform mixing tank of the polluted water treatment apparatus of FIG. FIG. 5 is a cross-sectional view taken along line CC in the vicinity of the uniform mixing tank and the lower spiral cylindrical body in the middle part of the contaminated water treatment apparatus of FIG. 1. FIG. 6 is a cross-sectional view along the line DD in the vicinity of the lowermost part of the lower spiral cylindrical body of the polluted water treatment apparatus of FIG. FIG. 7 is a cross-sectional view taken along the line E-E in the vicinity of the pollutant separation tank of the polluted water treatment apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dirty water treatment apparatus 2 Dirty water 3 Coagulant 4 Coagulant addition tank 4a Dirty water supply port 4b Coagulant addition instrument 4c Dirty water discharge port 5 Cylindrical mixing tank 5a Inlet 5b Discharge port 6 Coagulant addition / mixing tank 7 Contaminant Separation Tank 7a Inner Wall 7b Bottom 7c Discharge Port 8 Tubular Body 8a Straight Part 8b Bending Part 9 Flocculant-added Contaminated Water 10 Base 11 Spiral Cylindrical Body 12 Uniform Mixing Tank 13 Contaminated Water Distributors 13a, 13b Contaminated Water Discharge port 13c Contaminated water supply port 14 Contaminant 15 Bulkhead 16 Contaminant discharge valve θ Inclination L Length D Diameter

Claims (10)

  Consists of a flocculant addition / mixing tank that agglomerates suspended substances in the polluted water by adding flocculant to the contaminated water and mixing, and a pollutant separating tank that settles and separates the aggregated polluted substances In the contaminated water treatment apparatus, the flocculant addition / mixing tank includes a supply port for the polluted water, a flocculant adder, and a flocculant addition tank provided with the flocculant-added polluted water discharge port, and the addition of the flocculant The inlet side is connected to the tank, and the outlet side is connected to a pollutant separation tank for settling and separating the aggregated pollutant, and the sludge for adding flocculant-added polluted water flowing in from the inlet naturally flows down. And a cylindrical mixing tank having a structure in which a turbulent flow is generated by being bent.   The polluted water treatment apparatus according to claim 1, wherein the cylindrical mixing tank is a spiral cylindrical body formed by bending the cylindrical body while inclining and forming a substantially spiral shape.   The polluted water treatment apparatus according to claim 1 or 2, wherein the cylindrical mixing tank connects a plurality of spiral cylindrical bodies in series and forms a uniform mixing tank at the connecting portion.   When connecting a plurality of spiral cylindrical bodies in series, the upstream spiral cylindrical bodies are installed in parallel in a plurality of rows, and the downstream spiral cylindrical bodies are installed in fewer rows than the upstream side. The contaminated water treatment apparatus according to claim 3.   5. The cross-sectional area of the downstream spiral cylindrical body is formed larger than the cross-sectional area of the upstream spiral cylindrical body in the plurality of spiral cylindrical bodies connected in series. Pollution water treatment equipment.   The polluted water treatment apparatus according to any one of claims 1 to 5, wherein a flocculant addition tank is installed in front of each of the most upstream spiral cylindrical bodies in the cylindrical mixing tank.   The polluted water supplied to the polluted water supply port of the flocculant addition / mixing tank of the flocculant adding / mixing tank is distributed by a polluted water distributor having a plurality of polluted water discharge ports having different heights. Item 7. A contaminated water treatment apparatus according to any one of Items 1 to 6.   The polluted water treatment apparatus according to any one of claims 1 to 7, wherein a cross-sectional area of a polluted water discharge port supplied by the polluted water distributor is formed smaller than a cross-sectional area of a cylindrical mixing tank on the downstream side.   The polluted water treatment apparatus according to any one of claims 1 to 8, wherein the amount of flocculant added to a plurality of rows of flocculant addition / mixing tanks is adjusted according to the height of the level of the polluted water in the polluted water distributor. .   The polluted water treatment apparatus according to any one of claims 1 to 9, wherein the spiral cylindrical body is formed into a substantially quadrangular prism shape by bending the cylindrical body at a substantially right angle while inclining.

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