JP2013121588A - Water purification device, and water purification method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water purification device that has a simple configuration for suitably purifying water in a closed area, and to provide a water purification method using the same.SOLUTION: The water purification device includes: a water intake and treatment tank 2 in which water in a purification target area W is taken through an suction port 21; an underwater pump 3 for sucking up water from the water intake and treatment tank 2; a pipe 4 serving as a flow path for the water sucked up by the underwater pump 3; and a biological treatment tank 6 for carrying out denitrification and nitrification treatment. The pipe 4 is divided into a circulation side and a discharge side. A pipe 41 on the circulation side is provided at a tip end thereof with a nozzle 5. The nozzle 5 narrows a fluid cross section to increase the flow rate of the water to drive the water into water from the water surface of the water intake and treatment tank 2. The water passing through a discharge side pipe 42 is discharged into the purification target area outside the water intake and treatment tank 2.

Description

  The present invention relates to a water purification device that purifies sewage in a closed water area into which wastewater discharged from a factory, wastewater discharged from a factory or domestic wastewater flows, and a water purification method using the water purification device. .

  Conventionally, water purification treatment has been carried out for the purpose of purifying sewage in a closed water area into which wastewater discharged from a factory or wastewater discharged from a factory or domestic wastewater flows, etc.

  As these water purification treatments, there is a method of performing sewage treatment by alternately switching between an aerobic treatment for supplying air into water and an anaerobic treatment without supplying air into water (for example, refer to Patent Document 1).

JP 2006-158984 A

  The above-described conventional water purification device requires a step of sending air, a step of stirring, a step of purifying water by the action of microorganisms, a step of discharging water purified through these steps, and the like. In addition, a driving force is required in each process, which causes a problem that the apparatus becomes large.

  The present invention was devised in view of such circumstances, and provides a water purification device capable of suitably purifying water quality in a closed water area with a simple configuration, and a water purification method using this water purification device. For the purpose.

  The present invention is a device for purifying water quality in a closed water area, wherein an upper surface is opened, a plurality of water inlets are formed on an outer periphery and a bottom, and a portion where the water inlet is formed is submerged in water. A water treatment tank that is floated in the purification target water area and in which the water in the purification target water area is taken into the inside through the water intake port, and is disposed in the vicinity of the bottom of the water intake treatment tank. A submersible pump for pumping, a pipe connected to the submersible pump and serving as a flow path for water pumped from the submersible pump, and a biological organism for performing denitrification or nitrification treatment on the water pumped from the water intake treatment tank A treatment tank, and the pipe is branched into two parts, a circulation side and a discharge side, and the circulation side pipe sends out water passing through the circulation side pipe to the water intake treatment tank again, Nozzle is installed The discharge side pipe discharges the water passing through the discharge side pipe to the purification target water area outside the water treatment tank, and is provided with a flow rate adjusting valve, and the nozzle has a distal end at the base end. The flow rate of the water passing through the circulation side pipe is reduced by the nozzle and the flow velocity is increased, and the water is driven into the water from the water surface of the water intake treatment tank. On the other hand, at the base end of the nozzle, a biological treatment tank side pipe is branched and connected from the circulation side pipe, and water is sent from the biological treatment tank side pipe to the biological treatment tank, and denitrification is performed in the biological treatment tank. Alternatively, the water that has been subjected to nitrification is sent to a water intake treatment tank through a drain outlet formed at the bottom of the biological treatment tank.

  According to this invention, the upper surface of the water intake treatment tank is opened, and a plurality of water inlets are formed on the outer periphery and the bottom, so that the portion where the water inlets are formed floats in the purification target water area so as to be submerged in water. Thus, the water in the purification target water area is taken into the inside through the water inlet. Therefore, the water in the purification target water area can be easily guided into the water treatment tank with a simple configuration.

  Moreover, since the water in this intake water treatment tank is pumped up by the submersible pump, a negative pressure is generated in the intake water treatment tank, and the water in the purification target water area can be continuously introduced into the intake water treatment tank. In this case, it is possible to control the amount of water led into the water intake treatment tank by adjusting the discharge flow rate by adjusting the opening of the flow rate adjustment valve.

  Furthermore, since it has a biological treatment tank for performing denitrification or nitrification treatment on the water pumped up from the water intake treatment tank, denitrification treatment or nitrification is performed according to the degree of contamination of water to be treated. Processing can be selected. Therefore, it is possible to flexibly cope with one biological treatment tank, which is highly convenient and can reduce the size of the apparatus.

  Furthermore, the pipe that becomes the flow path of the water pumped up from the submersible pump is branched into the circulation side and the discharge side, and the circulation side pipe returns the water passing through the circulation side pipe to the water intake treatment tank again. The flow velocity is increased by narrowing the flow cross-section by the feed and the nozzle at the tip, and the water is driven into the water from the water surface of the water intake treatment tank, so that fine bubbles can be generated in the water intake treatment tank. The water in the water intake treatment tank is agitated by the momentum of the generated water flow. Therefore, aeration and agitation can be performed with the water circulated in the pipe from the water intake treatment tank, which is highly efficient. On the other hand, at the base end of the nozzle, the biological treatment tank side pipe is branched and connected from the circulation side pipe, and water is sent from the biological treatment tank side pipe to the biological treatment tank, and denitrification or Since the water that has undergone nitrification is sent to the water intake treatment tank through a drain outlet formed at the bottom of the biological treatment tank, the water that has been denitrified or nitrified is circulated in the water intake treatment tank. Will come. Therefore, purification of the water quality in the water intake treatment tank is promoted by such circulation.

  And since the discharge side piping is equipped with a flow rate adjustment valve, the flow rate adjustment valve is closed at the start of operation of the apparatus, and the total amount of water pumped up from the water intake treatment tank is sent to the circulation side piping. The water passing through the water is circulated to the water treatment tank. That is, the water passing through the circulation side pipe is driven into the intake water treatment tank through the nozzle, causing aeration of the water in the intake water treatment tank to dissolve and stir, while passing through the biological treatment tank side pipe The water is denitrified or nitrified in the biological treatment tank, and the water in the water intake treatment tank is purified by sending this water to the water treatment tank. When the water in the water intake treatment tank is purified to a desired level, the flow adjustment valve is opened to send the purified water to the discharge side pipe and discharge it to the purification target water area outside the water intake treatment tank. be able to. Therefore, highly efficient water purification treatment can be performed by such circulation.

  Thus, according to the present invention, it is possible to perform a highly efficient water purification process with the driving force of only the submersible pump.

  In the water purification apparatus having the above-described configuration, the discharge pipe for discharging the water in the biological treatment tank to the intake water treatment tank is connected to the discharge port of the biological treatment tank. A discharge pipe valve for adjusting the flow rate of water passing through the discharge pipe is provided at the distal end, and a backwash pipe connected to the discharge pipe of the biological treatment tank at the proximal end of the circulation side pipe And a backwash valve for adjusting the flow rate of water passing through the backwash pipe.

  According to the present invention, the backwash pipe connected to the discharge pipe of the biological treatment tank is branched and provided at the base end of the circulation side pipe, so that it is pumped from the submersible pump and sent to the circulation side pipe. Water can be sent to the circulation side pipe and the backwash pipe, respectively.

  Moreover, since the backwash valve which adjusts the flow volume of the water which passes the inside of piping for backwashing is provided, the following operation | movement is possible, for example.

  In other words, during normal operation, the backwash valve is closed so that water does not flow into the backwash pipe, and the entire amount of water pumped up from the submersible pump and sent to the circulation side pipe passes through the circulation side pipe as it is. And drive. And when backwashing, adjust the backwash valve so that all or part of the water passing through the circulation side pipe flows into the backwash pipe, close the discharge pipe valve, The water pumped up and sent to the circulation side pipe is guided from the discharge pipe of the biological treatment tank to the discharge port, and backflowed into the biological treatment tank, so that colloids and solids adhere to the discharge pipe and discharge pipe valve. Thus, the occurrence of a fouling phenomenon in which the flow rate decreases can be prevented.

  Further, the present invention provides the water purification apparatus as described above, comprising a pre-discharge treatment tank, wherein water passing through the discharge-side pipe is sent to the pre-discharge treatment tank and contacts the microorganisms in the pre-discharge treatment tank. After the catalytic oxidation is performed, the water is discharged into the purification target water area outside the water intake treatment tank.

  According to this invention, water that has been subjected to purification treatment to a desired degree in the water intake treatment tank is sent to the pre-discharge treatment tank, further subjected to catalytic oxidation by microorganisms, and further promoted purification, thereby purifying the target water area outside the water intake treatment tank Can be released.

  A plurality of the pre-treatment tanks are provided, and the water sent from the upstream pre-treatment tank is sequentially discharged to the downstream pre-treatment tank, and finally into the purification target water area outside the intake water treatment tank. It may be released.

  The water purified in this way is discharged into the purification target water area outside the intake water treatment tank, and the water in this purification object water area is taken into the intake water treatment tank, purified through a series of treatments, and discharged into the purification target water area Is repeated, and the degree of purification is promoted. Moreover, the power required for performing the series of treatments is only the submersible pump, and it is possible to provide a simple and highly convenient water purification device without increasing costs.

  Further, the present invention provides the water purification apparatus as described above, wherein a discharge pipe for sending water from the upstream pre-treatment tank to the downstream pre-treatment tank is connected to the upstream pre-treatment tank. The nitrification liquid return pipe for returning at least a part of the water sent from the upstream pre-discharge treatment tank to the biological treatment tank is branched and connected to the discharge pipe and passes through the nitrification liquid return pipe. And a nitrifying liquid return valve for adjusting the flow rate of the water to be supplied.

  According to this invention, it is possible to return at least a part of the water sent out from the pre-discharge treatment tank to the biological treatment tank via the nitrification liquid return pipe.

  In addition, the flow rate of water passing through the nitrating liquid return pipe can be adjusted by the nitrating liquid return valve.

  Therefore, by returning the water in the pre-treatment tank to the biological treatment tank while adjusting the flow rate of water passing through the nitrification liquid return pipe according to the degree of water pollution in the pre-treatment tank, the efficiency is improved. The denitrification conditions can be adjusted well.

  Further, the present invention provides the water purification apparatus as described above, wherein the most downstream side discharge pretreatment tank is disposed on the most downstream side for sending water from the downstream discharge pretreatment tank to a purification target water area outside the water treatment tank. A discharge pipe is connected, and a circulation operation pipe for returning at least a part of water sent from the downstream pre-discharge treatment tank to the water intake treatment tank is branched and connected to the most downstream discharge pipe. A circulation operation valve for adjusting a flow rate of water passing through the circulation operation pipe is provided.

  According to this invention, at least a part of the water sent out from the most downstream side pre-treatment tank can be returned to the water intake treatment tank via the circulation operation pipe.

  The flow rate of water passing through the circulation operation pipe can be adjusted by the circulation operation valve.

  Therefore, the water in the discharge pretreatment tank is returned to the water treatment tank while adjusting the flow rate of the water passing through the circulation operation pipe according to the degree of water pollution in the discharge pretreatment tank on the most downstream side. Thus, the water quality of the entire water purification device and the condition of microorganisms can be easily adjusted.

  Further, the present invention is a water purification method using the above-described water purification apparatus, the pumping step of pumping up water in the purification target water area taken into the water intake treatment tank through the water intake port with a submersible pump; The water pumped up from the submersible pump is sent to a pipe branched into a circulation side pipe and a discharge side pipe, and the flow rate of water passing through the circulation side pipe is increased by the nozzle narrowing the outflow section. The aeration and agitation process that is driven into the water from the water surface in the water intake treatment tank, and the water is sent from the biological treatment tank side pipe branched from the circulation side pipe to the biological treatment tank, and denitrification or nitrification is performed in the biological treatment tank. A process step in which the water subjected to denitrification or nitrification is sent to a water intake treatment tank through a drain outlet formed at the bottom of the biological treatment tank, and water passing through the discharge side pipe, Release Fed to the processing tank, characterized by having a a discharge process is discharged into the water intake treatment tank outside of the purification target water area after the catalytic oxidation is performed by contacting the microorganisms in the pretreatment tank discharge.

  According to this invention, the purified water is discharged into the purification target water area outside the intake water treatment tank, and the water in the purification target water area is taken into the intake water treatment tank and purified through a series of treatments. The circulation of being discharged into the water area is repeated, and the degree of purification is promoted. Moreover, the power required for performing a series of treatments is only one submersible pump, and it is possible to provide a simple and highly convenient water quality purification method without increasing the cost.

  ADVANTAGE OF THE INVENTION According to this invention, the water quality purification apparatus which can perform the water quality purification of a closed water area suitably with a simple structure, and the water quality purification method using this water quality purification apparatus can be provided.

It is the schematic which shows the outline | summary of the water purification apparatus which concerns on embodiment of this invention. It is a top view which shows the outline of the discharge pretreatment tank of the water purification apparatus of FIG. It is a perspective view which shows the partition plate of the discharge pretreatment tank of FIG. It is a perspective view which shows the outline of the discharge pre-treatment tank of the water purification apparatus of FIG. It is the schematic which shows the outline | summary of the water quality purification apparatus which concerns on other embodiment of this invention. It is the schematic which shows the example which uses a part of water quality purification apparatus which concerns on this invention as a unit.

Hereinafter, an embodiment of a water purification device according to the present invention and a water purification method using the water purification device will be described.
<First Embodiment>
The water purification apparatus according to the present invention is used, for example, to purify sewage in a closed water area into which wastewater, domestic wastewater, etc. discharged from an industrial factory or a regulating pond of a waste final disposal site flows. In particular, it is suitable for purifying sewage with a high COD (chemical oxygen demand) value very efficiently.

  In addition, the above-mentioned closed water area is a concept including not only a regulating pond, but also a river with a slow flow, and the water purification apparatus according to the present invention can be applied to, for example, a well regardless of the size. It is.

  As shown in FIG. 1, the water purification apparatus 1 according to the present embodiment has an upper surface opened, a plurality of water inlets 21 formed on the outer periphery and the bottom, and a portion where the water inlets 21 are formed is submerged in water. The water intake treatment tank 2 is floated in the purification target water area and the water in the purification target water area is taken into the inside through the water inlet 21, and is arranged in the vicinity of the bottom inside the water intake treatment tank 2. Denitrification is performed on the submersible pump 3 that pumps up water in the pipe 2, the pipe 4 that is connected to the submersible pump 3 and serves as a flow path for the water pumped up from the submersible pump 3, and the water pumped up from the water intake treatment tank 2. Or the biological treatment tank 6 for performing nitrification, and the discharge pre-treatment tank 7 for discharging the purified water are provided.

  Each configuration will be described below.

  The water intake treatment tank 2 is a water tank having an opening 20 having an upper surface opened, and is formed in a rectangular parallelepiped shape in the present embodiment, but is not limited to such a shape, for example, a cylindrical shape. There may be.

  The capacity of the water intake treatment tank 2 is appropriately set according to the scale of the purification target water area W and the discharge capacity of the submersible pump 3, but in this embodiment, the water intake treatment tank 2 having a capacity of about 500 liters to 2500 liters is suitable. Used for.

  Further, a carrier having a diameter of about 10 to 15 cm and a specific gravity of less than 1.0 is floated in the vicinity of the water surface in the water intake treatment tank 2 to improve efficiency.

  A plurality of water inlets 21 are opened at predetermined positions on the outer periphery and bottom of the water intake treatment tank 2. This water inlet 21 is for taking the water of the purification target water area W into the water treatment tank 2 and is preferably formed to have a diameter of about 1.0 cm. This is because if the diameter of the water inlet 21 is too large, foreign matter such as dust in the purification target water area W is mixed, and troubles such as the submersible pump 3 and each nozzle clogging occur.

  The number of the water inlets 21 is appropriately set according to the size of the water intake treatment tank 2 and the discharge capacity of the submersible pump 3, and since only an outline is shown in FIG. 1, only a few water inlets 21 are shown. In reality, a large number of water inlets 21 are formed.

  The water inlet 21 is formed at a predetermined depth from the opening 20 of the water intake treatment tank 2 because the water intake treatment tank 2 floats in the purification target water area W so that this portion is located on the water surface. 21 is not formed. In addition, the water inlet 21 is not formed in the bottom portion 22 corresponding to the portion directly below water to be injected from the nozzle 5 described later from the viewpoint of preventing the water in the water intake treatment tank 2 from being disturbed.

  In addition, an underwater pump 3 is disposed in the vicinity of the bottom 22 inside the water intake treatment tank 2, and the water in the water intake treatment tank 2 is pumped up.

The submersible pump 3 may be selected as appropriate according to the scale of the water area W to be purified, the water treatment tank 2 and the biological treatment tank 6, but in this embodiment, the small-scale treatment facility / septic tank or factory wastewater is treated. For example, a pump having a head capacity of 3.0 m or more, a discharge amount of 0.08 m ³ / min or more, and an output of 0.1 kW or more is used.

  In addition, about the discharge amount of the submersible pump 3, it always operates at maximum and supplies water to the biological treatment tank 6 and the pre-discharge treatment tank 7, so that the water quality in the water tank does not fluctuate rapidly. Moreover, by this, the water of the purification target water area W will be inevitably and suitably taken into the water intake treatment tank 2 from the water inlet 21.

  Thus, since the water purification apparatus 1 of this embodiment can perform a purification process with the driving force of only one submersible pump 3, it is difficult to cause a failure, and even if it occurs, it can be easily handled. Further, since the submersible pump 3 can be operated with a household 100 V power source, the installation location can be easily selected, and the amount of electricity used for a long period of operation is low.

  A pipe 4 serving as a flow path of the water pumped up from the submersible pump 3 is connected to the discharge port of the submersible pump 3.

  The pipe 4 is branched into two, a circulation side pipe 41 and a discharge side pipe 42.

  The circulation side pipe 41 sends out water passing through the circulation side pipe 41 to the water intake treatment tank 2 again, and a nozzle 5 is attached to the tip.

  The nozzle 5 is formed in a cylindrical shape or a polygonal cylindrical shape, and includes a main pipe 51, a branch pipe 52, and a jet port portion 53. The diameter of the jet part 53 is formed smaller than the diameter of the main pipe 51, and the flow velocity of the water passing through the circulation side pipe 41 is increased by the jet part 53 being narrowed. It is configured to be driven into the water from the water surface of the water intake treatment tank 2. The main pipe 51 is provided with a valve 54 so that the flow rate passing through the nozzle 5 can be adjusted.

  The size of the nozzle 5 is appropriately set according to the scale of the water area to be purified. In the present embodiment, the inner diameter of the main pipe 51 is set to 40 mm and can be adjusted in the range of 30 mm to 100 mm. Yes. Further, the flow rate of water ejected from the ejection port 53 is set to be 6 to 10 m / sec, the inner diameter of the ejection port 53 is set to 16 mm, and is adjusted within a range of 10 mm to 35 mm. It has been made possible.

  In addition, the front-end | tip of the jet nozzle part 53 is extended by the length of the grade which the water flow ejected from the jet nozzle part 53 does not diverge.

  Since the nozzle 5 is configured in this way, the flow cross section of the water passing through the nozzle 5 is narrowed by the jet port 53, the flow velocity is increased, and the water is vigorously driven into the water from the water surface of the water intake treatment tank 2. Therefore, fine bubbles can be generated in the water intake treatment tank 2, and the water in the water intake treatment tank 2 can be agitated by the momentum of the driven water flow so that aeration and agitation can be performed.

  Therefore, it is possible to generate fine bubbles in the water intake treatment tank 2 without adopting a technique for including air in the water flow that has been conventionally used.

  In this embodiment, the distance between the nozzle 5 and the water surface is set to 15 cm, and can be adjusted in the range of 1 cm to 100 cm according to the water flow and the nozzle aperture.

  The branch pipe 52 is connected to the biological treatment tank side pipe 43, and a biological treatment tank side valve 64 is provided at this connection portion so that the amount of water flowing into the biological treatment tank side pipe 43 can be adjusted. ing.

  A biological treatment tank side nozzle 61 is detachably attached to the tip of the biological treatment tank side pipe 43.

  Similarly to the nozzle 5, the tip diameter of the biological treatment tank side nozzle 61 is narrowed, and the flow rate is increased by narrowing the flow cross section of the water passing through the biological treatment tank side nozzle 61. It is comprised so that it may be driven into the water from 6 water surfaces.

  In this embodiment, the distance between the nozzle 61 and the water surface is set to 4 cm, and can be adjusted in the range of 1 cm to 30 cm according to the water flow and the nozzle aperture.

  Therefore, when nitrification is performed, the biological treatment tank side nozzle 61 is attached so that aeration and agitation are performed in the biological treatment tank 6. On the other hand, when performing the denitrification process, it is not necessary to give dissolved oxygen, so the biological treatment tank side nozzle 61 is removed so that bubbles are not generated in the biological treatment tank 6. In this case, the biological treatment tank side pipe 43 is submerged below the surface of the water, and the flow rate of water sent out from the biological treatment tank side pipe 43 is used for stirring the water in the biological treatment tank 6.

  The biological treatment tank 6 has a drain outlet 62 formed at the bottom, and the water treated in the biological treatment tank 6 is sent out to the water intake treatment tank 2 through the drain outlet 62. Further, a discharge pipe 63 is connected to the drain port 62, and a discharge pipe valve 65 that adjusts the flow rate sent to the discharge pipe 63 is provided. Further, an overflow part 66 is provided in the upper part of the biological treatment tank 6, and water is allowed to flow from the overflow part 66 to the water intake treatment tank 2 when a certain water level is exceeded. In order to operate the biological treatment tank 6 without using power for drainage and maintaining a constant water level, the opening degree of the valve 65 at the lower part of the biological treatment tank is adjusted so as to slightly overflow.

  The inside of the biological treatment tank 6 is filled with a nitrification carrier having a small diameter and a denitrification carrier having a large diameter. In the present embodiment, the nitrification carrier is a tube having a diameter of 4 mm, and the denitrification carrier is a spherical one having a diameter of 150 mm. However, the shape is not limited to this example.

  Both the nitrification carrier and the denitrification carrier are used for increasing the surface area on which microorganisms (digested bacteria / denitrifying bacteria) are fixed. Since the nitrification carrier is very small, it is accommodated in a net-like bag 67 in order to prevent outflow from the drain port 62.

  Whether to perform nitrification or denitrification is selected according to the degree of water pollution. In addition, in the case where the BOD component is insufficient or the like, illustration is omitted so that adjustment can be performed by adding methanol. It can be poured into the treatment tank 6.

  Moreover, when performing a denitrification process, the biological treatment tank 6 can be covered using a light-shielding heat insulation screen (illustration omitted). This is to promote the action of denitrifying bacteria.

  On the other hand, the discharge side pipe 42 sends water passing through the discharge side pipe 42 to the pre-discharge treatment tank 7 and finally discharges it to the purification target water area W outside the intake water treatment tank 2. A valve B is provided.

  A discharge pretreatment tank side nozzle 70 is attached to the distal end portion of the discharge side pipe 42, and the flow velocity of the water passing through the discharge side pipe 42 is reduced by the discharge pretreatment tank side nozzle 70. Is increased and driven into the water from the water surface of the discharge pretreatment tank 7. Therefore, fine bubbles can be generated in the discharge pretreatment tank 7, and the water in the discharge pretreatment tank 7 is agitated by the momentum of the driven water flow so that aeration and agitation can be performed.

  In this embodiment, the distance between the nozzle 70 and the water surface is set to 10 cm, and can be adjusted in the range of 1 cm to 30 cm according to the water flow and the nozzle aperture.

  As shown in FIGS. 1 and 2, the discharge pretreatment tank 7 is partitioned inside, and an inflow tank 71 into which water is driven from the discharge pretreatment tank side nozzle 70 and a plurality of water channels 72 are formed. The catalytic oxidation is performed efficiently.

  In the present embodiment, 14 layers of water channels 72 are formed. Further, a partition plate 73 shown in FIG. 3 is provided at the boundary between the inflow tank 71 and the water channel 72, and water in the inflow tank 71 flows out from the notch 74 to the water channel 72. By doing so, the water aerated and agitated in the inflow tank 71 flows gently into the water channel 72, and the contact time with microorganisms is increased.

  In addition, in this embodiment, although the water channel 72 of 14 layers is formed, the number of layers of the water channel 72 is increased / decreased according to the magnitude | size of the discharge | emission pretreatment tank 7, taking into consideration residence time and flow velocity. As the width of the water channel 72 is narrowed and the number of layers of the water channel 72 is increased, the total length of the water channel 72 becomes longer. In this case, however, the flow rate increases, and thus there is a risk that the settled microorganisms will flow out. For this purpose, the number of layers is added to the limit at which microorganisms do not flow out, and a net 76 is provided to further increase the contact area. Moreover, regarding the depth of the discharge pretreatment tank 7, the depth is increased in order to reduce the flow velocity, but it is also considered together with the width of the water channel 72 so that sunlight can reach the bottom. Furthermore, the capacity setting of the inflow tank 71 is set so as not to overflow even at a flow rate at which the planned maximum discharge flow rate is accelerated by the nozzle 70.

  Moreover, the partition 75 installed so that it might have a clearance gap was provided in the boundary of the water channel 72, and the efficiency of contact oxidation is raised so that a flow path may become long. The partition 75 is configured in the same manner as the partition plate 73, and is arranged so that the cutout portions 75a are alternated. Therefore, water flows gently through the water channel 72.

  Furthermore, as described above, the nets 76 are provided between the water channels 72 to increase the surface area so as to form an environment in which microorganisms can efficiently propagate.

  In addition, inside the inflow tank 71, nets 76a having the same configuration as the net 76 are provided at substantially equal intervals so as to increase the surface area so as to form an environment in which microorganisms can efficiently propagate.

  In addition, a discharge port 77 is provided in the water channel that finally reaches the pre-discharge treatment tank 7, and a discharge pipe 78 is connected to the discharge port 77, so that water in the pre-discharge treatment tank 7 flows next. To the pre-release treatment tank 7.

  4 is a perspective view showing the entire pre-discharge treatment tank 7 with the nets 76 and 76a omitted, but as shown in FIG. 4, there is an overflow hole 7h on the downstream side of the pre-discharge treatment tank 7. Is formed. An overflow pipe (not shown) is connected to the overflow hole 7h, and an overflow can be caused at an arbitrary water level by appropriately lifting the overflow pipe. The installation height of the overflow pipe is usually matched with the height of the notch 75a at the top of the partition 75. Further, during maintenance, the overflow pipe is lowered below the bottom surface and used as a drain pipe for the pre-discharge treatment tank 7.

  The discharge pretreatment tank 7 formed in this way is provided in a plurality of stages, and the water sent out from the upstream discharge pretreatment tank 7 is sequentially sent out to the downstream pretreatment tank 7 for finalization. It is preferable that the water is discharged into the purification target water area W outside the intake water treatment tank 2, and in this embodiment, a two-stage discharge pretreatment tank 7 is provided.

  Finally, the water is discharged from the discharge pipe 78 provided at the discharge port 77 of the pre-treatment tank 7 to the lower layer of the purification target water area W. This is because the water in the upper layer part and the lower layer part is replaced by taking water in the upper layer part of the purification target water area W and discharging it in the lower layer part, thereby contributing to purification of the stagnant water area in the bottom part.

  Next, a water purification method using the water purification device 1 described above will be described.

  This method includes a step of pumping up water in the purification target water area W taken into the water intake treatment tank 2 through the water inlet 21 with the submersible pump 3, and the water pumped up from the submersible pump 3 is connected to the circulation side pipe 41. The flow rate of the water that is sent to the pipe 4 branched to the discharge side pipe 42 and passes through the circulation side pipe 41 is increased by the nozzle 5 being narrowed in the outflow section, and the water flows into the water from the water surface in the water intake treatment tank 2. Water is sent to the biological treatment tank 6 from the aeration and agitation process to be driven and the biological treatment tank side pipe 43 branched from the circulation side pipe 41, and denitrification or nitrification is performed in the biological treatment tank 6, thereby denitrification or nitrification. Water that has been subjected to the treatment process is sent to the water intake treatment tank 2 through the drain port 62 formed at the bottom of the biological treatment tank 6, and the water that passes through the discharge side pipe 42 is supplied to the pre-discharge treatment tank 7. Before being sent out and released And a, a discharge process is discharged to the intake treatment vessel 2 outside of the purification target water area after the catalytic oxidation is performed by contacting the microorganisms in the physical tank 7.

  Hereinafter, each step will be described in order.

  First, the water intake treatment tank 2 is floated and installed in the purification target water area so that the water inlet 21 is located in water.

  Next, the submersible pump 3 is driven to pump up water in the water intake treatment tank 2 (pumping step). About the discharge amount etc. of the submersible pump 3, it sets suitably so that the water of a purification target water area may be suitably taken in into the water intake treatment tank 2 from the water intake 21 continuously. Then, the water pumped up from the submersible pump 3 is sent out to the pipe 4.

  At the start of operation of the water purification device 1, the flow rate adjustment valve B and the biological treatment tank side valve 64 of the discharge side pipe 42 are closed, and the total amount of water pumped from the intake water treatment tank 2 is transferred to the circulation side pipe 41. It is desirable to send it out to the main pipe 51 of the nozzle 5. Immediately after the start of operation, the circulation in the water intake treatment tank 2 is concentrated in the aeration and stirring process by the main pipe 51 to confirm the degree of purification of the water in the water intake treatment tank 2. For example, after the COD value in the intake water treatment tank 2 decreases to the target value, if the dissolved oxygen amount rises to 0.5 to 3.0 mg / L, normal operation (flow rate adjustment valve B and biological treatment tank side valve) The operation proceeds to 64). That is, in the normal operation, the flow rate adjustment valve B and the biological treatment tank side valve 64 are opened so as to obtain an arbitrary flow rate, respectively, and 40% to 95% of the water flow from the submersible pump 3 is taken in through the nozzle 5. Circulating the treatment tank 2 and the biological treatment tank 6, the remaining water flow is sent to the pre-discharge treatment tank 7 through the discharge pipe 42 and finally discharged.

  When the water passing through the circulation side pipe 41 reaches the nozzle 5, it is branched into the biological treatment tank side pipe 43 and the main pipe 51, and the water cross section of the water passing through the main pipe 51 is narrowed by the jet port 53. As a result, the flow velocity is increased and the water is vigorously driven into the water from the water surface of the water intake treatment tank 2. Therefore, fine bubbles can be generated in the water intake treatment tank 2, and the water in the water intake treatment tank 2 can be agitated by the momentum of the driven water flow to perform aeration and agitation (aeration agitation step). . In this step, the amount of dissolved oxygen can be increased by generating a large amount of fine bubbles (diameter of 5 mm or less) in the water intake treatment tank 2.

  The distance between the spout 53 and the water surface of the intake water treatment tank 2 is the pressure of the submersible pump and the circulation rate (ratio of the amount of water pumped from the intake water treatment tank 2 and the amount of water sent back into the intake water treatment tank 2). Therefore, adjustment is made within a range of 10 to 500 mm. The ejection amount of the nozzle 5 is desirably 50 L / min or more, but is adjusted by the flow rate adjusting valve B and the biological treatment tank side valve 64 so as to ensure at least 35 L / min.

  Water is sent out from the biological treatment tank side pipe 43 to the biological treatment tank 6, and denitrification or nitrification is performed in the biological treatment tank 6 according to the water quality, and the water subjected to denitrification or nitrification is biologically treated. It is sent out to the water intake treatment tank 2 through a drain port 62 formed at the bottom of the tank 6 (treatment process).

  When the denitrification process is performed in the biological treatment tank 6, the biological treatment tank side nozzle 61 is removed, the biological treatment tank side pipe 43 is submerged under the water surface of the biological treatment tank 6, and the water fed from the biological treatment tank side pipe 43 is removed. The flow rate is used for stirring the water in the biological treatment tank 6. And the upper-end opening part of the biological treatment tank side nozzle 61 is closed for light shielding. In order to make denitrifying bacteria work, it is necessary to create an environment in which the water quality in the biological treatment tank 6 is such that the amount of dissolved oxygen is 0.5 mg / L or less and the oxidation-reduction potential minus is around 200 mV. Therefore, the degree of contamination in the water intake treatment tank 2 is controlled by adjusting the opening degree of the flow rate adjustment valve B, and the circulation rate is controlled by the valve 64. That is, the opening degree of the flow rate adjustment valve B is adjusted so that the quality of the water sent to the biological treatment tank 6 is less than or equal to the dissolved oxygen amount of 0.5 mg / L. At this time, if the water quality in the biological treatment tank 6 is near the oxidation-reduction potential minus 200 mV, the flow rate adjustment valve B is not adjusted. On the other hand, when the oxidation-reduction potential is higher than minus 100 mV, the oxidation-reduction potential is lowered by opening the flow rate adjustment valve B and lowering the circulation rate. When the BOD component is insufficient, methanol is instilled. The amount of methanol to be instilled is adjusted while observing the water quality of the biological treatment tank 6. Since this circulation system circulates alternately between the anaerobic biological treatment tank 6 and the aerobic water intake treatment tank 2, denitrification efficiency is suitable.

  Further, when purification of the water quality of the purification target water area W is promoted and denitrification does not occur, nitrification is performed in the biological treatment tank 6. At this time, the biological treatment tank side nozzle 61 is attached, and the light shielding heat insulating screen (not shown) is removed. By using the biological treatment tank side nozzle 61, it is driven vigorously into the water from the water surface of the biological treatment tank 6 as in the above-described aeration and stirring step. Accordingly, fine bubbles can be generated in the biological treatment tank 6, and the water in the biological treatment tank 6 can be agitated and aerated and stirred by the momentum of the driven water flow. The distance between the tip of the biological treatment tank side nozzle 61 and the water surface of the biological treatment tank 6 is adjusted in the range of 10 to 300 mm. When the water quality flowing into the biological treatment tank 6 is operated at a circulation rate that can sufficiently reduce the COD value in the water intake treatment tank 2 by adjusting the flow rate adjustment valve B, the water quality naturally becomes suitable for nitrification. The quality of water flowing into the biological treatment tank 6 through the nozzle 61 is preferably adjusted by the valve B so that the dissolved oxygen becomes 1.5 mg / L or more.

  Thus, since one denitrification process or nitrification process can be performed in the biological treatment tank 6 according to the water quality, the configuration of the apparatus is simple and the convenience is high. For example, when the water quality of the purification target water area W is a water quality that does not require denitrification, it is more efficient to operate the biological treatment tank 6 by replacing it with the pre-release treatment tank 7. This is because the biological treatment tank 6 is shaped so that it can naturally shift to the nitrification operation after the treatment is started in the denitrification operation. This is because it is highly efficient.

  On the other hand, the water that passes through the discharge side pipe 42 is sent to the pre-discharge treatment tank 7 and contacted with microorganisms in the pre-discharge treatment tank 7, and after contact oxidation is performed, the water to be purified outside the water treatment tank 2. It is discharged into the water area (release process).

  A discharge pretreatment tank side nozzle 70 is also attached to the tip of the discharge side pipe 42 and is driven into the water vigorously from the water surface of the discharge pretreatment tank 7 (inflow tank 71) in the same manner as the above-described aeration and stirring step. Accordingly, fine bubbles can be generated in the discharge pretreatment tank 7, and the water in the discharge pretreatment tank 7 (inflow tank 71) is agitated by the momentum of the driven water flow to perform aeration and stirring. Can do.

  In addition, nets 76n are provided at substantially equal intervals in the inflow tank 71, so that highly efficient aeration and stirring can be performed.

  And the water sent out from the inflow tank 71 to the water channel 72 in which microorganisms have been fixed flows through the water channel 72 while slowly contacting the microorganisms.

  It is desirable to use a plurality of discharge pretreatment tanks 7. In the present embodiment, the two-stage discharge pretreatment tank 7 is used, but the present invention is not limited to this.

When a plurality of pre-treatment tanks 7 are used, water is sent from the upstream pre-treatment tank 7 to the downstream pre-treatment tank 7, and in the downstream pre-treatment tank 7, the upstream discharge Aeration and agitation are performed by water falling from the pretreatment tank 7. The number of pre-release treatment tanks 7 is appropriately set depending on the degree of water pollution.

  And finally, it discharges from the discharge pipe 78 provided in the discharge port 77 of the discharge pretreatment tank 7 to the lower layer part of the purification target water area W.

  In the present embodiment, the microorganisms used for water purification use native microorganisms in the purification target water area W as much as possible from the viewpoint of considering the environmental impact of the water area. Specifically, sludge adhering to sludge and aquatic plants in the water area W to be purified is used.

Second Embodiment
Next, a second embodiment of the present invention will be described.

  The main configuration of the water purification apparatus 1 according to the present embodiment is the same as that of the first embodiment described above, and therefore, description of similar parts is omitted, and different parts are described in detail below.

  In addition, the same code | symbol is attached | subjected about the same structure.

  The water purification apparatus 1 according to this embodiment has the same basic configuration as that of the first embodiment, but mainly has the following characteristics as shown in FIG.

  First, a backwash pipe 411 connected to the discharge pipe 63 of the biological treatment tank 6 is branched and connected to the base end of the circulation side pipe 41, and the flow rate of water passing through the backwash pipe 411 is determined. A backwash valve 411a for adjustment is provided.

  Therefore, the water pumped up from the submersible pump 3 and sent out to the circulation side pipe 41 can be sent to the circulation side pipe 41 and the backwash pipe 411, respectively.

Moreover, since the backwash valve 411a for adjusting the flow rate of water passing through the backwash pipe 411 is provided, for example, the following operation is possible.
(1) During normal operation, the backwash valve 411a is closed so that water does not flow into the backwash pipe 411, and the entire amount of water pumped up from the submersible pump 3 and sent out to the circulation side pipe 41 remains as it is on the circulation side. The operation is performed so as to pass through the pipe 41.
(2) When backwashing, the backwash valve 411a is adjusted so that all or part of the water passing through the circulation side pipe 41 flows into the backwash pipe 411, and the discharge pipe valve 65 is closed. Thus, the water pumped up from the submersible pump 3 and sent to the circulation side pipe 41 is led from the discharge pipe 63 of the biological treatment tank 6 to the drain port 62 and backflowed into the biological treatment tank 6, whereby the discharge pipe It is possible to prevent the occurrence of a fouling phenomenon in which the colloid or solid matter adheres to 63 or the discharge pipe valve 65 and the flow rate decreases.

  Next, a nitrification liquid return pipe 781 for returning at least a part of the water sent from the upstream pre-treatment tank 7 to the biological treatment tank 6 is branched to the discharge pipe 78 of the upstream pre-treatment tank 7. And a nitrating liquid return valve 781a for adjusting the flow rate of water passing through the nitrating liquid returning pipe 781 is provided.

  Therefore, at least a part of the water sent out from the pre-discharge treatment tank 7 can be returned to the biological treatment tank 6 via the nitrification liquid return pipe 781.

  In addition, the flow rate of water passing through the nitrating liquid return pipe 781 can be adjusted by the nitrating liquid return valve 781a.

  Since it is configured in this manner, the water in the pre-discharge treatment tank 7 is adjusted while adjusting the flow rate of the water passing through the nitrification liquid return pipe 781 according to the degree of water pollution in the pre-release treatment tank 7. By returning to the biological treatment tank 6, denitrification conditions can be adjusted efficiently.

  Moreover, since the water in the pre-discharge treatment tank 7 can be returned to the biological treatment tank 6, the circulation system for performing the denitrification treatment in the biological treatment tank 6 is the anaerobic biological treatment tank 6 and the aerobic treatment water intake. Denitrification efficiency is suitable because the nitrification liquid in the treatment tank 2 and the pre-discharge treatment tank 7 is alternately circulated.

  Subsequently, at least a part of the water sent from the downstream pre-treatment tank 7 is returned to the water treatment tank 2 to the discharge pipe 78 (the most downstream discharge pipe) of the most downstream pre-treatment tank 7. The operation pipe 79 is branched and connected, and a circulation operation valve 79 a for adjusting the flow rate of water passing through the circulation operation pipe 79 is provided.

  Therefore, at least a part of the water sent out from the most downstream pre-discharge treatment tank 7 can be returned to the water treatment tank 2 via the circulation operation pipe 79.

  The flow rate of water passing through the circulation operation pipe 79 can be adjusted by the circulation operation valve 79a.

  Since it is constituted in this way, the discharge pretreatment tank 7 is adjusted while adjusting the flow rate of the water passing through the circulation operation pipe 79 according to the degree of water pollution in the discharge pretreatment tank 7 on the most downstream side. By returning the inner water to the water treatment tank 2, the water quality of the entire water purification device and the condition of microorganisms can be easily adjusted.

  The embodiment of the present invention has been described above as an example, but is not limited to the above-described example.

  Moreover, the water purification apparatus of the present invention can be implemented in a state in which all the configurations are provided, and a part of the configurations can be used as a unit.

  For example, as shown in FIG. 6, the sludge accumulated on the bottom of the purification target water area W is adjusted by moving the nozzle 70 used for aeration of the discharge pretreatment tank 7 up and down in the water of the purification target water area W. Can be stirred.

  That is, by stirring and winding up the sludge accumulated at the bottom of the purification target water area W, the native microorganisms in the purification target water area W are also rolled up. Then, floating sludge and microorganisms can be taken into the water treatment tank 2. In this case, in the initial state, the biological treatment tank 6 and the pre-release treatment tank 7 are not used, and if the biological treatment tank 6 and the pre-release treatment tank 7 are equipped after the sludge is wound up, the indigenous microorganisms in the water area W to be purified are biological. It can be taken into the treatment tank 6 and the pre-discharge treatment tank 7, and the conventional microorganisms can be suitably used for water purification. Moreover, the sludge state of a water bottom can also be improved by stirring the sludge collected on the water bottom of the purification target water area W. Therefore, it is possible to efficiently purify water according to the contamination state of the purification target water area W.

  INDUSTRIAL APPLICABILITY The present invention is useful in that it can provide a water purification device that can suitably perform water purification in a closed water area with a simple configuration and a water purification method that uses this water purification device.

1 Water purification device 2 Water treatment tank 3 Submersible pump 4 Piping 5 Nozzle 6 Biological treatment tank 7 Discharge pretreatment tank B Flow control valve W Purification target water area

Claims (7)

A device for purifying water in a closed water area,
The upper surface is opened, and a plurality of water inlets are formed on the outer periphery and the bottom, and the portion where the water inlets are formed is floated on the purification target water area so as to be submerged in water. A water treatment tank to be taken into the inside through the mouth;
A submersible pump disposed near the bottom of the water treatment tank and pumping up water in the water treatment tank;
A pipe connected to the submersible pump and serving as a flow path for water pumped from the submersible pump;
A biological treatment tank for performing denitrification or nitrification treatment on the water pumped from the water intake treatment tank,
The pipe is branched into two parts, a circulation side and a discharge side, and the circulation side pipe sends out water passing through the circulation side pipe to the water intake treatment tank again, and a nozzle is attached to the tip. The discharge side pipe discharges the water passing through the discharge side pipe to the purification target water area outside the water treatment tank, and is equipped with a flow rate adjustment valve.
The tip of the nozzle is formed with a smaller diameter than the base end, and the flow rate of water passing through the circulation side pipe is reduced by the nozzle, and the flow velocity is increased. While configured to be driven into
At the base end of the nozzle, a biological treatment tank side pipe is branched and connected from the circulation side pipe, and water is sent from the biological treatment tank side pipe to the biological treatment tank, and denitrification or nitrification is performed in the biological treatment tank. A water purification apparatus, wherein treated water is sent out to a water intake treatment tank through a drain outlet formed at the bottom of the biological treatment tank. The water purification apparatus according to claim 1,
A discharge pipe for discharging the water in the biological treatment tank to the water intake treatment tank is connected to the discharge port of the biological treatment tank, and the flow rate of water passing through the discharge pipe is set at the tip of the discharge pipe. There is a discharge pipe valve to adjust,
A backwash valve for branching and connecting a backwash pipe connected to the discharge pipe of the biological treatment tank to the proximal end of the circulation side pipe and adjusting the flow rate of water passing through the backwash pipe The water purification apparatus characterized by the above-mentioned. The water purification apparatus according to claim 1,
Equipped with a pre-release treatment tank,
The water passing through the discharge side pipe is sent to the pre-discharge treatment tank, contacted with microorganisms in the pre-discharge treatment tank, contact oxidation is performed, and then discharged to the purification target water area outside the intake water treatment tank. A water purification apparatus characterized by that. In the water purification apparatus according to claim 3,
A plurality of the pre-treatment tanks are provided;
A water purification apparatus, wherein water sent out from an upstream pre-treatment tank is sequentially sent out to a downstream pre-treatment tank and finally discharged into a purification target water area outside the water treatment tank. The water purification apparatus according to claim 4,
A discharge pipe for sending water from the upstream pre-treatment tank to the upstream pre-treatment tank is connected to the upstream pre-treatment tank,
Water passing through the nitrification liquid return pipe is connected to the discharge pipe by branching and connected to a nitrification liquid return pipe for returning at least a part of the water sent from the upstream pre-release treatment tank to the biological treatment tank. A water purification apparatus comprising a nitrification liquid return valve that adjusts the flow rate of water. The water purification apparatus according to claim 4 or 5,
The most downstream discharge pipe is connected to the most downstream discharge pretreatment tank, and the water in the downstream pretreatment tank is sent out to the purification target water area outside the water treatment tank.
A circulation operation pipe for returning at least a part of the water sent out from the downstream pre-discharge treatment tank to the most downstream discharge pipe is branched and connected to the inside of the circulation operation pipe. A water purification apparatus comprising a circulation operation valve for adjusting a flow rate of passing water. A water purification method using the water purification device according to claim 3 or 4,
A pumping step of pumping up water in the purification target water area taken into the water intake treatment tank through the water suction port with an underwater pump;
The water pumped up from the submersible pump is sent to a pipe branched into a circulation side pipe and a discharge side pipe, and the water passing through the circulation side pipe is increased in flow velocity by the nozzle having a narrowed outflow section, Aeration and agitation step driven into the water from the water surface in the water intake treatment tank;
Water is sent out to the biological treatment tank from the biological treatment tank side pipe branched from the circulation side pipe, and denitrification or nitrification is performed in the biological treatment tank, and the water subjected to the denitrification or nitrification is the biological treatment tank. A treatment process sent out to a water intake treatment tank through a drain outlet formed at the bottom of the
The water passing through the discharge side pipe is sent to the pre-discharge treatment tank, and after contact oxidation is performed by contacting the microorganisms in the pre-discharge treatment tank, it is discharged to the purification target water area outside the intake water treatment tank. A discharge process,
Water purification method characterized by having.

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