JP2003320375A - System for treating turbid water and automobile for treating turbid water mounting the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for treating turbid water which can improve the turbidity of water independently of the quantity of the turbid water and turbid material. <P>SOLUTION: The system comprises an oxygen dissolving device dissolving oxygen of a high concentration in raw water (turbid water), an iron electrolyzing device feeding iron ions to the raw water in which oxygen is dissolved, a rapid and slow agitating vessels agitating the ions fed from the iron electrolyzing device with the raw water and flocculating the turbid materials contained in the raw water to precipitate them, and a vessel for flocculation by injecting a flocculant to the treated water from the rapid and slow agitating vessels. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a turbid water treatment system.

[0002]

2. Description of the Related Art For example, a turbid water treatment system shown in FIG. 4 is known as a raw water (turbid water) treatment system generated during tunnel excavation or ground reinforcement work. In FIG.
Reference numeral 1 denotes a pump for discharging muddy water discharged during tunnel construction to the outside of the tunnel, for example. 2 is a water storage tank for storing the turbid water discharged from the pump, 3 is a coagulant mixing tank, and after adjusting the pH of the turbid water, polyaluminum chloride (hereinafter P
AC) is charged and rapidly stirred by a stirrer (not shown). In this tank, relatively fine flock is formed.

Reference numeral 4 denotes a slow stirring tank which is arranged in the latter stage of the flocculant mixing tank 3, in which relatively fine flocs produced in the rapid stirring tank 3 are gently stirred by a stirrer (not shown) or the like. The flocs grown in the coagulant mixing tank 3 in the previous stage are grown into larger flocs and precipitated. Reference numeral 5 denotes a coagulation tank, in which a polymer coagulant is injected into the suspended matter in the raw water which has not been sufficiently flocculated in the slow stirring tank 4.

Reference numeral 6 is a precipitation separation tank, in which aggregation / precipitation is further promoted by the polymer coagulant injected in the previous stage. Then, water satisfying legal regulations (supernatant having a concentration of 200 mg / L or less) is discharged to a river or the like. Although not shown in the figure, each tank is provided with a means for removing precipitates, and the suspended matter that has precipitated is appropriately removed.

[0005]

For example, in the case of tunnel construction, the amount and turbidity of turbid water flowing into the water tank 2 increases during tunnel excavation and decreases when the excavation is interrupted. It also increases when the cement is sprayed on the tunnel wall.

Further, there is a change in the water quality (pH) due to the use of washing water for preventing the solidification of the cement scattered on the floor of the tunnel, a change in the stratum, and an increase / decrease in the amount of spring water. .

By the way, in the conventional system, PAC or a polymer flocculant is used as a means for purifying turbid water.
However, agglomeration by PAC has a problem that the aggregating action may not agglomerate and settle due to components of pH and turbidity, and even if agglomerates, it is difficult to satisfy the legal regulation (200 mg / L or less).

[0008] Further, there is a problem that it is difficult to find a coagulation condition when fine turbidity of clay and components of cement flow in. In addition, aluminum (A
l) is also a causative agent of Alzheimer's disease and an element that inhibits the growth of agricultural products, and there has been a demand to suppress the release into the environment as much as possible.

The present invention has been made in view of such circumstances, and an object thereof is to provide a turbid water treatment system capable of improving the turbidity of water regardless of the amount, turbidity, and pH of turbid water. .

[0010]

In order to achieve the above object, the present invention provides, in claim 1, an oxygen dissolving device for dissolving oxygen in raw water (turbid water) to a high concentration and a raw water in which oxygen is dissolved. An iron electrolysis device that supplies iron ions, a rapid stirring tank and a slow stirring tank that stir the ions and raw water supplied by this iron electrolysis device to flocculate and settle suspended matter contained in the raw water, and this slow speed It is characterized in that it is configured to include a flocculating tank for injecting a flocculant into the treated water from the stirring tank to form a floc.

A second aspect of the present invention is the turbid water treatment system according to the first aspect, wherein the oxygen dissolving device has an ability of dissolving oxygen in raw water of 30 mg / L or more.

A third aspect of the present invention is the turbid water treatment system according to the first or second aspect, wherein the flocculant is sodium alginate.

According to a fourth aspect of the present invention, in the turbid water treatment system according to any one of the first to third aspects, the oxygen dissolving device includes a pump for supplying raw water to the closed tank, and oxygen for the closed tank and / or the raw water. It is composed of an oxygen supply means for supplying and a baffle plate provided in the closed tank, and is arranged so that raw water supplied from the pump into the closed tank is jetted toward the baffle plate. .

According to a fifth aspect of the present invention, in the turbid water treatment system according to any one of the first to third aspects, the oxygen dissolving device includes a pump for supplying raw water to the closed tank, and oxygen to the closed tank and / or the raw water. It consists of an oxygen supply means for supplying and a nozzle provided in a gas reservoir in the closed tank, and the raw water supplied from the pump is arranged so as to jet toward the water surface from the nozzle, and the raw water in the closed tank is It is characterized by making it swirl.

According to a sixth aspect of the present invention, in the turbid water treatment system according to any one of the first to fifth aspects, the oxygen dissolving device includes a pump and a pipe having a turbulent flow generating section connected to the latter stage of the pump, It is characterized by comprising a pump and / or gas supply means for supplying gas to the pipe, and arranged so that the gas dissolves in the liquid due to turbulent flow in the pipe while the liquid is transported in the pipe.

According to a seventh aspect of the present invention, in the turbid water treatment system according to any one of the first to sixth aspects, a monitoring means for monitoring the turbidity of the treated water is provided, and the amount of iron eluted is adjusted according to the turbidity. Therefore, the feature is that the amount of electrolytic current is controlled.

According to an eighth aspect of the present invention, in the turbid water treatment system according to any one of the first to seventh aspects, monitoring means for monitoring the turbidity of the treated water is provided, and the injection amount of the coagulant is controlled according to the turbidity. It is characterized by doing so.

According to a ninth aspect, in the turbid water treatment system according to any of the first to eighth aspects, a means for dissolving carbon dioxide gas in the raw water is provided in order to adjust the hydrogen ion concentration (pH) of the raw water. It has a feature.

According to a tenth aspect, in the turbid water treatment system according to the ninth aspect, the hydrogen ion concentration (p
It is characterized in that a monitoring means for monitoring H) is provided and the dissolved amount of carbon dioxide gas is controlled in order to adjust the pH.

According to an eleventh aspect, in the turbid water treatment system according to any one of the first to eighth aspects, the hydrogen ion concentration (pH) of the raw water whose dissolved oxygen concentration is increased by the oxygen dissolving device is adjusted. It is characterized in that a means for dissolving carbon dioxide gas in raw water is provided in the latter stage of the oxygen dissolving device.

According to a twelfth aspect of the present invention, in the turbid water treatment system according to the eleventh aspect, the hydrogen ion concentration (pH) of the raw water whose dissolved oxygen concentration is increased by the oxygen dissolving device.
Is provided, and the amount of dissolved carbon dioxide gas is controlled in order to adjust the pH.

In the thirteenth aspect, the first to twelfth aspects are provided.
It is characterized by being a turbid water treatment vehicle equipped with the turbid water treatment system according to any one of the claims.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block configuration diagram of a turbid water treatment system showing an example of an embodiment of the present invention. The same elements as those in the conventional example shown in FIG. 4 are designated by the same reference numerals.

In FIG. 1, raw water (turbid water) discharged by a pump 1 is stored in a water storage tank 2. This water tank 2
A dissolved oxygen concentration meter 10 is installed in the tank to monitor the dissolved oxygen concentration in the water tank. Reference numeral 11 denotes an oxygen dissolving device, and the oxygen dissolving device 11 uses, for example, one as shown in FIG.

The oxygen dissolving apparatus 11 shown in FIG. 2 will be briefly described. 20 is a closed tank. This closed tank 20
The turbid water from the raw water storage tank 2 is sent through the pump 26 and stored at a predetermined level. Reference numeral 21 is a level meter for measuring the water level in the closed tank 20, and 22 is a control valve. Although not shown in the figure, it is used to adjust the opening / closing or throttle of the control valve 22 so as to maintain the water level of the muddy water at a predetermined level. Equipped with control means.

Further, oxygen is supplied to the space 20a of the closed tank 20 from the oxygen cylinder 23 or the oxygen generator 24 at a predetermined pressure. Reference numeral 25 is a pressure gauge for monitoring the pressure in the tank 20, and although not shown in the figure, the pressure gauge 2
Control means is provided for adjusting the pressure of the oxygen cylinder 23 and the oxygen generator 24 based on the signal from 5. Two
Reference numeral 7 is a drain valve for discharging the mud or the like settled on the bottom of the tank 20.

The turbid water sent through the pump 26 is jetted toward the baffle 28 disposed below the surface of the turbid water stored in the tank 20 to make it remarkably foam.
It is configured so that gas and liquid are efficiently mixed and dissolved, and oxygen can be dissolved in 30 mg / L or more. Turbid water in which oxygen is dissolved at a high concentration is sent to the iron electrolysis device 13 via the control valve 22 and the flow meter 12.

As means for dissolving oxygen, the tip of the nozzle is arranged near the inner wall of the tank as shown by the portion A surrounded by the alternate long and short dash line in FIG. 2, and raw water supplied from the pump is directed toward the water surface from the nozzle. The raw water in the closed tank 20 can be swirled so that the gas and the liquid (raw water) are efficiently mixed and dissolved.

Further, a turbulent flow generator 29 is provided downstream of the pump 26.
A gas supply means (not shown) for supplying gas to the pump 26 and the pipe is provided in addition to the connection of the pipe provided with, and the gas is dissolved in the raw water by the turbulent flow in the pipe while the liquid is transferred in the pipe. You can also choose to do so.

The limited water supplied to the iron electrolysis apparatus 13 is controlled to a predetermined flow rate through the control valve 22, and the rotation speed of the pump 26 is adjusted so that the gas pressure in the space 20a in the tank becomes constant. Is controlled by an inverter (not shown), the concentration of dissolved oxygen dissolved in the tank becomes constant, power consumption is suppressed, and efficient operation can be performed.

FIG. 3 is a main part configuration diagram showing an example of the iron electrolysis apparatus 13. In the figure, the elution tank 30 has iron electrodes 31, 3
2 is provided and a voltage is applied by the DC power supply 33, and iron ions Fe ²⁺ are dissolved and supplied in turbid water in which oxygen is dissolved in a high concentration.

In the above-mentioned apparatus, when muddy water in which a high concentration of oxygen is dissolved in the oxygen dissolution apparatus 11 is sent from the arrow a, Fe ²⁺ is oxidized by utilizing dissolved oxygen to produce Fe ^3+.
While flowing into the rapid stirring tank 3 indicated by the arrow B.

Returning to FIG. 1, suspended solids are flocculated and settled from the rapid stirring tank 3 through the slow stirring tank 4, and the purified treated water flows into the coagulation tank 5. In the present invention, alginic acid is used here. Mix with sodium. Conventionally, sodium alginate is mixed with tap water and has an aggregating effect less than that of a polymer aggregating agent, but it is a component safe to humans and nature.

The treated water mixed with sodium alginate in the flocculation tank 5 is sent to the precipitation separation tank 6. Sedimentation tank 6
Is equipped with a sludge concentration (MLSS) meter 14 to monitor turbidity, and the amount of sodium alginate mixed is increased or decreased according to the output signal.

As shown in FIG. 1, carbon dioxide injection means 25 for dissolving carbon dioxide gas and hydrogen ion (pH) measuring means 26 are provided in the raw water storage tank 2 to adjust the pH of the raw water to about 5. It is possible to accelerate the elution of the iron electrode of the iron dissolving device in the latter stage (the elution of iron enhances the sludge condensation effect).

Carbon dioxide injection means 2 for dissolving carbon dioxide
The installation location of 5 is not limited to the raw water storage tank 2 and may be any stage before the iron electrolysis device. For example, it may be provided in the latter stage of the oxygen dissolving device 11 and in the latter stage (for example, the rapid stirring tank 3), pH measuring means may be provided to adjust the dissolved amount of carbon dioxide gas based on the measurement signal of the pH measuring means. .

Although not shown in the figure, the oxygen dissolving apparatus shown in FIG. 2 and the iron electrolysis apparatus and coagulant injection apparatus shown in FIG.
The carbon dioxide gas injecting means, these control devices, and the like can be mounted on a vehicle as a package and can be moved to each work place.

The above description of the present invention has been presented only with reference to particular preferred embodiments for purposes of illustration and illustration. Accordingly, the invention is subject to many modifications without departing from its essence,
It will be apparent to those skilled in the art that variations can be made. For example, the configurations of the oxygen dissolution device and the iron electrolysis device are not limited to the embodiments. The scope of the present invention, which is defined by the description in the scope of claims, includes changes and modifications within the scope.

[0039]

According to the first to third aspects of the invention, there is provided an iron electrolysis device which dissolves oxygen in the raw water (turbid water) to a high concentration and supplies iron ions to the raw water. Therefore, it is possible to form dense flocs having a large specific gravity and a high sedimentation rate as compared with a conventional apparatus in which PAC is mixed. for that reason,
The treatment efficiency of muddy water is good, and it is not necessary to use a polymer flocculant harmful to humans and nature in the subsequent treatment.

According to the fourth to sixth aspects of the invention, the raw water is collided with the baffle plate, or the raw water in the closed tank is swirled by devising the jetting direction of the nozzle, and the turbulent flow generating means and the piping are provided. By providing the gas supply means for supplying the gas, the gas and the liquid can be efficiently mixed and dissolved.

According to the invention of claim 7 or 8, since the monitoring means for monitoring the degree of contamination of the treated water is provided and the coagulant injection is controlled in accordance with the degree of contamination, the expensive coagulant is expensive. Since it suffices to mix only the optimum amount of the above, it is possible to realize a turbid water treatment system with a low running cost.

According to the ninth to twelfth aspects of the invention, the carbon dioxide gas injection means is provided to adjust the pH of the raw water, or the carbon dioxide injection is controlled by monitoring the pH of the raw water. It is possible to promote the elution of the iron electrode of the iron dissolving device and enhance the sludge condensation effect.

According to the thirteenth aspect of the present invention, the oxygen dissolving device, the iron electrolyzing device and the coagulant injection control means can be mounted on the vehicle as a package. Therefore, it is easy for many turbid water treatment systems used at construction sites nationwide. It can be applied to and can be installed and removed quickly.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a turbid water treatment system showing an example of an embodiment of the present invention.

FIG. 2 is a configuration diagram showing an example of an oxygen dissolving device.

FIG. 3 is a configuration diagram showing an example of an iron electrolysis device.

FIG. 4 is a block diagram showing an example of a conventional turbid water treatment system.

[Explanation of symbols]

1 pump 2 Raw water (turbid water) water tank 3 rapid stirring tank 4 Slow stirring tank 5 aggregation tank 6 sedimentation tank 10 Dissolved oxygen meter 11 Oxygen dissolver 12 Flowmeter 13 Iron electrolysis device 14 Sludge concentration (MLSS) meter 22 Control valve 25 Carbon dioxide injection device 26 Hydrogen ion (pH) measuring device

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B60P 3/00 B60P 3/00 Q C02F 1/463 E21D 9/06 301U 1/465 C02F 1/46 102 E21D 9/06 301 (72) Inventor Tetsuro Matsumoto 2-932 Nakamachi, Musashino City, Tokyo Yokogawa Electric Co., Ltd. (72) Inventor Hiroshi Ishii 2-932 Nakamachi, Musashino City, Tokyo Yokogawa Electric Co., Ltd. In-house F-term (reference) 2D054 DA35 4D015 BA10 BA12 BA19 BB09 BB12 CA10 DA12 DB33 EA03 EA07 EA13 EA16 EA32 FA01 FA25 FA28 4D061 DA10 DB11 EA07 EB01 EB04 EB28 EB39 ED06 FA11 FA14 GC02 GC12 4G0415 AA AB

Claims (13)

[Claims] 1. An oxygen dissolving device for dissolving oxygen in raw water (turbid water) at a high concentration, an iron electrolysis device for supplying iron ions to raw water in which oxygen is dissolved, and ions and raw water supplied by the iron electrolysis device. Containing a rapid agitation tank and a slow agitation tank that agitate the water to flocculate the sediment contained in the raw water and settle it, and a flocculation tank that injects a flocculant into the treated water from the slow agitation tank to form a floc. The turbid water treatment system characterized in that 2. The oxygen dissolving device has an oxygen dissolving ability of 3 in raw water.
The turbid water treatment system according to claim 1, wherein the turbid water treatment system is 0 mg / L or more. 3. The turbid water treatment system according to claim 1, wherein the coagulant is sodium alginate. 4. An oxygen dissolving device comprises a pump for supplying raw water to a closed tank, an oxygen supply means for supplying oxygen to the closed tank and / or the raw water, and a baffle plate provided in the closed tank. The turbid water treatment system according to any one of claims 1 to 3, wherein the raw water supplied from the pump into the closed tank is arranged to jet toward the baffle plate. 5. An oxygen dissolving device comprises a pump for supplying raw water to a closed tank, an oxygen supply means for supplying oxygen to the closed tank and / or the raw water, and a nozzle provided in a gas reservoir in the closed tank. 4. The raw water supplied from the pump is arranged so as to be jetted from the nozzle toward the water surface, and the raw water in the closed tank is swirled. Turbid water treatment system described. 6. An oxygen dissolving device comprises a pump and a pipe provided with a turbulent flow generator connected to the latter stage of the pump, and a gas supply means for supplying a gas to the pump and / or the pipe. The turbid water treatment system according to any one of claims 1 to 5, wherein the gas is dissolved in the liquid by the turbulent flow in the pipe while being transferred in the pipe. 7. A monitoring means for monitoring the turbidity of the treated water is provided, and the electrolytic current amount is controlled in order to adjust the elution amount of iron according to the turbidity. The turbid water treatment system according to any one of 1 to 6. 8. A monitoring means for monitoring the turbidity of the treated water is provided to control the injection amount of the coagulant according to the turbidity. Turbid water treatment system. 9. The turbid water treatment system according to claim 1, further comprising carbon dioxide injection means for dissolving carbon dioxide in the raw water in order to adjust the hydrogen ion concentration of the raw water. 10. A monitoring means for monitoring the hydrogen ion concentration of the raw water is provided, and the dissolved amount of carbon dioxide gas is controlled in order to adjust the hydrogen ion concentration.
Turbid water treatment system described. 11. A carbon dioxide gas injection means for dissolving carbon dioxide gas in raw water is provided at a subsequent stage of the oxygen dissolution device to adjust the hydrogen ion concentration of the raw water whose dissolved oxygen concentration has been increased by the oxygen dissolution device. Claims 1 to 8 characterized
The turbid water treatment system according to any one. 12. A monitoring means for monitoring the hydrogen ion concentration of the raw water whose dissolved oxygen concentration has been raised by the oxygen dissolving device is provided, and the dissolved amount of carbon dioxide gas is controlled in order to adjust the hydrogen ion concentration. The turbid water treatment system according to claim 11, wherein 13. A turbid water treatment vehicle comprising the turbid water treatment system according to any one of claims 1 to 12.