JP2015188777A - Water treatment apparatus and water treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water treatment apparatus including a reaction tank in which solid contents are present in a floating state, hardly causing uneven distribution of the solid contents in the reaction tank, so that treatment of water to be treated can be efficiently performed; and a water treatment method.SOLUTION: The water treatment apparatus includes: a reaction tank in which water to be treated is treated; a channel for water to be treated through which the water to be treated is transported to a lower part of the reaction tank; a feed pipe disposed in the channel for water to be treated, through which the water to be treated is introduced into the reaction tank; and an outflow part through which the water to be treated flows out to an upper part of the reaction tank. A plurality of the feed pipes are disposed in the lower 1/3 region in the height direction from the bottom of the reaction tank to the outflow part. The feed pipes are disposed to have different ejection directions of the water to be treated from each other, when the tips of the respective feed pipes are superimposed by rotational transfer around the vertical axis passing through the center of gravity in the horizontal plane of the reaction tank and/or parallel transfer from the axis toward the radial direction. The channel for water to be treated includes switching means for selecting the feed pipe to introduce the water to be treated into the reaction tank.

Description

  The present invention relates to an upward flow type water treatment apparatus and a water treatment method using the apparatus.

  Conventionally, a water treatment apparatus and a water treatment method are known in which solid components such as sludge (microorganisms) and a carrier exist in a floating state in a reaction tank, and the treatment is performed in an upward flow manner. For example, Patent Documents 1 to 3 disclose such a water treatment apparatus, and water configured to supply water to be treated from a plurality of supply pipes (supply nozzles) provided in the lower part of the reaction tank. A processing device is disclosed.

JP-A-7-308686 Japanese Utility Model Publication No. 3-52159 JP 2012-152675 A

  In a water treatment device that has a solid content in the reaction tank in a floating state and performs treatment in an upward flow type, a flow of the water to be treated is formed in the reaction tank by supplying the water to be treated from the lower part of the reaction tank. However, for example, even if the water to be treated is supplied in a plurality of directions from the supply pipe, there is a concern that the uneven distribution of solids may occur in the reaction tank due to the flow of the water to be treated settled in a steady state. Is done. In this case, a water channel is formed in the reaction tank, and the treatment water may pass through an area where there is almost no solid content.

  The present invention has been made in view of the above circumstances, and the object thereof is to provide a reaction tank in which solid content exists in a floating state, to prevent uneven distribution of solid content in the reaction tank, and to treat treated water. It is providing the water treatment apparatus and water treatment method which can perform efficiently.

  The water treatment apparatus of the present invention that has solved the above problems includes a reaction tank that treats the water to be treated, a water passage to be treated to which the water to be treated is transferred to the lower part of the reaction tank, and a water passage to be treated. A water treatment device having a supply pipe into which the water to be treated is introduced into the reaction tank and an outflow part through which the treated water flows out to the upper part of the reaction tank; the supply pipe from the bottom of the reaction tank A plurality of supply pipes are provided in a region of the lower third of the height direction leading to the outflow part; the plurality of supply pipes are rotated and / or rotated from the axis with a vertical line passing through the center of gravity of the horizontal plane of the reaction tank. When the tips of the supply pipes are overlapped by parallel movement in the radial direction, the directions in which the water to be treated is ejected are different from each other; supply pipes for introducing the water to be treated into the reaction water flow path It is characterized in that switching means for selecting is provided. According to the water treatment apparatus of the present invention, the plurality of supply pipes are provided so as to form different flows of water to be treated, and the supply pipe for introducing the water to be treated into the reaction tank by the switching means is provided over time. Since it can change, it becomes easy to prevent uneven distribution of solid content in a reaction tank, and it becomes easy to treat treated water efficiently.

  The reaction tank may have a reduced area formed so that the horizontal cross-sectional area gradually decreases toward the bottom at the lower part. In this case, the supply pipe is preferably provided in the reduced area. In this way, if the reduced region is formed in the lower part of the reaction tank and the supply pipe is provided, the solid content is less likely to stay in the bottom corner of the reaction tank, and the solid content is less likely to accumulate in the part.

  It is preferable that a microorganism holding carrier or granular sludge is held in the reaction tank. Microorganism-holding carriers and granule sludge are easy to settle because of their large particle size, and because they have a certain mass, they tend to accumulate in a compacted state. However, according to the present invention, the flow of different water to be treated is changed in the reaction tank over time, thereby making it easier to prevent the microbe holding carrier and granule sludge from being consolidated and unevenly distributed in the reaction tank. It becomes easy to treat treated water efficiently.

  It is preferable that the water treatment apparatus is provided with a circulation channel that circulates at least a part of the treated water in communication with the outflow portion of the reaction tank and the treated water channel. For example, when the water to be treated is not sufficiently treated by passing the water to be treated once through the reaction tank, at least a part of the treated water is returned to the water to be treated through the circulation channel, Finally, highly treated water can be obtained.

The water treatment apparatus of the present invention has at least two of the first supply pipe, the second supply pipe, and the third supply pipe as the supply pipes; With respect to the direction from the tip of the first supply pipe to the horizontal plane center of gravity of the reaction tank, the ejection direction projected on the horizontal plane is 0 ° or a positive angle α _1, and −45 ° or more 45 with respect to the horizontal plane. The second supply pipe is projected onto the horizontal plane with respect to the direction from the tip of the second supply pipe to the center of gravity of the horizontal plane of the reaction tank. The ejection direction is 0 ° or a negative angle α _2, and is provided to be an angle of −45 ° or more and 45 ° or less with respect to the horizontal plane; the third supply pipe has an ejection direction of water to be treated. More than 45 ° and less than 90 ° or more than -90 ° and less than -45 ° with respect to the horizontal plane It is preferable to be provided. By providing the supply pipe in this way, different treatment water flows in the horizontal direction are formed in the reaction tank, or a flow mainly in the vertical direction and a flow in the horizontal direction are mainly formed. In the reaction tank, the uneven distribution of solid content is prevented, and the treatment efficiency of the water to be treated can be increased.

When the supply pipe has at least a first supply pipe and a second supply pipe, the difference between the angle α ₁ of the first supply pipe and the angle α ₂ of the second supply pipe is preferably 45 ° or more. By providing the first supply pipe and the second supply pipe in this manner, a different flow of water to be treated can be formed in the reaction tank by the first supply pipe and the second supply pipe.

  When the supply pipe has at least a third supply pipe, it is preferable that the third supply pipe is provided below the first supply pipe and / or the second supply pipe. Since the third supply pipe mainly forms a flow in the vertical direction, the third supply pipe is provided below the first supply pipe and / or the second supply pipe, so that an upward flow is generated in the entire reaction tank. As a result, the solid content hardly stays or accumulates at the bottom of the reaction vessel.

  The treated water flow path includes a first treated water flow path provided with a part of the first supply pipe, the second supply pipe, and the third supply pipe, and a second supply pipe provided with the other supply pipe. A circulation channel that circulates at least part of the treated water is provided in communication with the outflow part of the reaction tank and the treated water channel; the first treated water channel is composed of raw water. It is preferable that the supplied raw water flow channel and the circulation flow channel communicate with each other; the second treated water flow channel communicates with the circulation flow channel and does not communicate with the raw water flow channel. Thus, by providing the 1st treated water channel and the 2nd treated water channel, it becomes possible to treat treated water efficiently. For example, by introducing raw water having a high concentration through the first treated water flow path to a place with high treatment efficiency (activity) in the reaction tank and diluting with treated water as necessary, the activity in the reaction tank is increased. Can be maintained. Since treated water having a low concentration is introduced into the reaction tank from the second treated water flow path, priority is given to increasing the stirring efficiency in the reaction tank without being restricted by the activity in the reaction tank or the introduction flow rate. It is possible to prevent uneven distribution of solids in the reaction vessel.

  It is preferable that the first treated water flow path is provided with a third supply pipe, and the second treated water flow path is provided with a first supply pipe and a second supply pipe. Since the third supply pipe mainly forms a flow in the vertical direction, the water to be treated introduced from the third supply pipe is treated by the water to be treated introduced from the first supply pipe or the second supply pipe. It is agitated by colliding with the flow that mainly forms in the horizontal direction, and the contact frequency with the solid content becomes relatively high. Therefore, it becomes easy to improve the processing efficiency in a reaction tank by supplying raw | natural water into a reaction tank from a 3rd supply pipe through a 1st to-be-processed water flow path.

  The present invention also provides a water treatment method using the water treatment apparatus of the present invention. The water treatment method of the present invention includes, for example, a step of supplying water to be treated to a reaction tank from some of the plurality of supply pipes, and not supplying water to be treated from another supply pipe to the reaction tank. It is preferable to have a step of supplying the water to be treated to the reaction tank from the other supply pipe and not supplying the water to be treated to the reaction tank from a part of the supply pipe. Further, the water treatment method of the present invention supplies the water to be treated to the reaction tank from a part of the plurality of supply pipes at a large flow rate, and the water to be treated from the other supply pipe to the reaction tank. Supplying the water to be treated from the other supply pipe to the reaction tank at a large flow rate, and supplying the water to be treated from a part of the supply pipe to the reaction tank. It may have a process of supplying at a small flow rate of 1/2 times or less.

  When at least the first supply pipe and the second supply pipe are provided as the supply pipe, the water treatment method of the present invention supplies the treated water from the first supply pipe to the reaction tank and the treated water from the second supply pipe. It is preferable to have a step of not supplying the reaction tank to the reaction tank and a step of supplying the water to be treated to the reaction tank from the second supply pipe and not supplying the water to be treated to the reaction tank from the first supply pipe. In the case of having the first supply pipe, the second supply pipe, and the third supply pipe as the supply pipe, the water treatment method of the present invention supplies the treated water from the first supply pipe and the third supply pipe to the reaction tank, The process of not supplying the water to be treated from the second supply pipe to the reaction tank, the water to be treated is supplied from the second supply pipe and the third supply pipe to the reaction tank, and the water to be treated is supplied from the first supply pipe to the reaction tank. It is preferable to have a step of not supplying water to be treated to the reaction tank from the third supply pipe, and to have no process of supplying water to be treated to the reaction tank from the first supply pipe and the second supply pipe. Also good.

  By supplying the water to be treated to the reaction tank as described above, the flow of the water to be treated changes with time in the reaction tank, and different flows of water to be treated can be formed in the reaction tank. As a result, it becomes easy to prevent uneven distribution of solid contents in the reaction tank, and it becomes easy to efficiently treat the water to be treated.

  When the water treatment apparatus is provided with a circulation channel for circulating at least a part of the treated water, the water treatment method of the present invention supplies the treated water through the first treated water channel and the second treated water channel. It is preferable to have a step of supplying to the reaction tank, a step of supplying the water to be treated to the reaction tank through the first treated water flow channel, and a step of not supplying the water to be treated through the second treated water flow channel. In this case, the treated water is supplied to the reaction tank in any process from the first treated water flow channel communicating with the raw water flow channel, and a part of the second treated water flow channel not communicating with the raw water flow channel is used. To-be-processed water will be supplied to a reaction tank only from a process. Therefore, the raw water is basically supplied to the reaction tank at all times and is stably processed. On the other hand, since the treated water changes over time and is returned to the reaction tank from the second treated water flow path, different treated water flows with time are formed in the reaction tank. The uneven distribution of solids can be prevented. In this case, it is preferable that the first treated water flow path is provided with the third supply pipe, and the second treated water flow path is provided with the first supply pipe and the second supply pipe. The method includes supplying a water to be treated from the first supply pipe and the third supply pipe to the reaction tank and not supplying the water to be treated from the second supply pipe to the reaction tank, and from the second supply pipe and the third supply pipe. Supplying the water to be treated to the reaction tank and not supplying the water to be treated from the first supply pipe to the reaction tank; supplying the water to be treated from the third supply pipe to the reaction tank; the first supply pipe and the second supply It is preferable to have the process which does not supply to-be-processed water from a pipe | tube to a reaction tank. Furthermore, in the water treatment method of the present invention, the water to be treated is supplied from the third supply pipe to the reaction tank at a large flow rate, and the water to be treated is supplied from the second supply pipe to the reaction tank at a half or less of the large flow rate. Supplying the treated water from the first supply pipe to the reaction tank at a medium flow rate that is less than the large flow rate and larger than the small flow rate, and supplying the treated water from the third supply pipe to the reaction tank at a large flow rate The water to be treated is supplied from the first supply pipe to the reaction tank at a small flow rate not more than 1/2 times the large flow rate, and the water to be treated is supplied from the second supply pipe to the reaction tank at a flow rate less than the high flow rate. Supplying the water to be treated from the third supply pipe to the reaction tank at a large flow rate and supplying the water to be treated from the first supply pipe and the second supply pipe to the reaction tank. It may have a process of supplying at a small flow rate of 1/2 times or less. Thus, even if to-be-processed water is supplied to a reaction tank, the flow of to-be-processed water changes with time in a reaction tank, and the flow of different to-be-processed water can be formed in a reaction tank. As a result, it becomes easy to prevent uneven distribution of solid contents in the reaction tank, and it becomes easy to efficiently treat the water to be treated.

  According to the water treatment apparatus and the water treatment method of the present invention, a plurality of supply pipes are provided so as to form different flows of water to be treated, and further, supply pipes for introducing the water to be treated into the reaction tank by the switching means Therefore, it is easy to prevent uneven distribution of solids in the reaction tank, and it becomes easy to efficiently treat the water to be treated.

The structural example of the water treatment apparatus of this invention is represented. The schematic diagram which showed the ejection direction of the to-be-processed water from each supply pipe | tube in the horizontal surface in which each supply pipe | tube of the reaction tank shown in FIG. 1 was provided is represented. The schematic diagram which showed the ejection direction of the to-be-processed water of each supply pipe which looked at the lower part of the reaction tank shown in FIG. 1 from the side is represented. The structural example of the water treatment apparatus of this invention is represented.

  The present invention relates to a water treatment apparatus for biologically or chemically treating water to be treated and a water treatment method using the apparatus. The water treatment apparatus of the present invention includes a reaction tank for treating the water to be treated, and the treatment is performed in an upward flow type in which the water to be treated is introduced into the lower part of the reaction tank and the treated water flows out from the upper part. The water treatment apparatus of the present invention includes a fluidized bed type reaction tank that treats water to be treated in which a solid content is present in a floating state in the reaction tank, and is particularly likely to settle in the reaction tank or is compacted after settling. It is suitably used for treating water to be treated containing solids that easily accumulate in the state.

  The water treatment apparatus of the present invention is provided with a plurality of supply pipes for introducing the water to be treated into the reaction tank. And a supply pipe is provided so that to-be-processed water may form the flow of a mutually different direction within a reaction tank, and the switching means which selects the supply pipe | tube which introduces a to-be-processed water into a reaction tank is provided. For this reason, when introducing the water to be treated into the reaction tank, a plurality of different water to be treated can be formed in the reaction tank over time, and as a result, uneven distribution of solids in the reaction tank can be prevented. It becomes easy and it becomes easy to treat the to-be-treated water efficiently.

  In the present invention, to-be-treated water means water that is introduced into a reaction tank and treated, for example, raw water, treated water that is returned to the reaction tank through a circulation channel as will be described later, and return sludge. , Diluted water and the like are included. The raw water to be treated is not particularly limited as long as it contains an organic substance or an inorganic substance. Raw water includes, for example, sewage, human waste, process wastewater generated from sewage treatment and human waste treatment, factory wastewater generated from food factories, paper pulp factories, chemical factories, etc., and livestock waste such as animal manure and animal manure Waste water generated by the above.

  The water treatment apparatus includes a reaction tank that treats the water to be treated, a water passage to be treated to which the water to be treated is transferred to the lower part of the reaction tank, and an outflow part through which the treated water flows out at the upper part of the reaction tank. The shape of the reaction vessel is not particularly limited, and typically, a cylindrical shape or a rectangular parallelepiped can be mentioned.

  In the reaction tank, together with the water to be treated, a reaction field for biologically or chemically converting organic substances and inorganic substances contained in the water to be treated is held as a solid content. The medium providing the reaction field is held in the reaction vessel in a fluid state. That is, the reaction tank is a fluidized bed type. For example, when the water to be treated is biologically treated, sludge, that is, microorganisms are held in the reaction tank as a reaction field, and the water to be treated is treated aerobically or anaerobically with the sludge (microorganisms). The sludge may be present in the reaction tank in a floating state, or may be present as granular sludge formed in a granular form. Further, a microorganism holding carrier in which microorganisms are held on a carrier may be held in the reaction tank. In the case of chemically treating the water to be treated, a catalyst or an adsorbent can be held as a reaction field. In this case, the catalyst and the adsorbent are held in the reaction vessel in a fluid state.

  The treated water flow path may be provided in the reaction tank in any form as long as it can transfer the treated water to the lower part of the reaction tank. For example, the treated water flow path is connected to the lower part of the reaction tank from the outside of the reaction tank. It may be a thing, It introduce | transduces in the reaction tank from the exterior of a reaction tank, and the inside of a reaction tank may be arrange | positioned to the lower part of a reaction tank. The treated water channel is provided in communication with the reaction vessel, and may be in communication with a raw water channel to which raw water is supplied, or may be in communication with a circulation channel to be described later.

  The treated water flow path is provided with a supply pipe through which treated water is introduced into the reaction tank, and a plurality of supply pipes are provided in the lower part of the reaction tank. In addition, the lower part of a reaction tank means the area | region of the lower 1/3 of the height direction from the bottom part of a reaction tank to an outflow part. Therefore, a plurality of supply pipes (specifically, the tip of the supply pipe) are provided in a lower third region (preferably a lower quarter region) in the height direction from the bottom of the reaction tank to the outflow portion. . The height to the outflow portion means the height to the lowest position in the outflow portion.

  The treated water channel may be a single channel, a plurality of channels, or may be branched in the middle. That is, it is only necessary that a plurality of supply pipes are provided in the lower part of the reaction tank regardless of the water channel to be treated and the arrangement form. The to-be-processed water flow path should just be provided as a pipe line.

  The supply pipe for introducing the water to be treated into the reaction tank is not particularly limited as long as it can form a water flow in the reaction tank. A supply pipe | tube may be provided in the front-end | tip of a to-be-processed water flow path, and may be branched and provided in the middle. The inner diameter of the supply pipe is preferably formed to be equal to or less than the inner diameter of the water channel to be treated. By forming the supply pipe in this way, the water to be treated can be introduced into the reaction vessel vigorously. it can. If the inner diameter of the supply pipe is the same as the inner diameter of the water channel to be treated, and the two cannot be distinguished apparently, the part 5 cm from the tip is regarded as the supply pipe.

  The supply pipe of the water to be treated may be a nozzle, for example. If a nozzle is provided as a supply pipe for the water to be treated, the inner diameter is narrower than that of the water passage for the water to be treated, and the water to be treated can be vigorously introduced into the reaction tank.

  The plurality of supply pipes provided in the lower part of the reaction tank are at least partially provided so that the water to be treated ejected from the supply pipe forms different flows in the reaction tank. The treated water introduced into the reaction tank is roughly divided into (1) a flow toward the vertical direction of the reaction tank, (2) a flow toward the horizontal plane center direction of the reaction tank, and (3) the horizontal plane center of the reaction tank. On the other hand, it is divided into a flow toward the radial direction and (4) a flow toward the swirl direction with respect to the horizontal center of the reaction vessel. Note that the flows (2) to (4) may include a flow in the vertical direction, that is, a combination of a vertical direction vector and a horizontal direction vector. Furthermore, since the flow toward the turning direction of (4) can take various angles as viewed from the center of the horizontal plane, the flow of (4) includes a plurality of flows. However, when only one of these flows is formed in the reaction tank, the flow of the water to be treated is uneven in the reaction tank, and the solid content tends to be unevenly distributed in the reaction tank. As a result, there is a risk that the treatment water will be insufficiently treated in the reaction tank.

  Therefore, in the water treatment apparatus of the present invention, a plurality of supply pipes are provided as follows. That is, when the tip of each supply pipe is overlapped by rotating and / or translating from the axis in the radial direction about the vertical line passing through the horizontal plane center of gravity of the reaction tank, the water to be treated is ejected. A plurality of supply pipes are provided in such a manner that the directions are different from each other. This will be described in detail below.

  The horizontal center of gravity of the reaction tank means the center of gravity of the cross section of the reaction tank in the horizontal plane including the tip of the target supply pipe. The horizontal center of gravity of the reaction vessel corresponds to, for example, the center of a circle when the horizontal cross section of the reaction vessel is circular, and corresponds to the intersection of two diagonal lines when the horizontal cross section of the reaction vessel is rectangular. When a plurality of supply pipes are located at different heights, a horizontal plane is defined for each supply pipe.

  The rotational movement around the vertical line passing through the horizontal plane center of gravity means that the target supply pipe is rotationally moved on the horizontal plane about the horizontal plane center of gravity. At this time, the plurality of supply pipes are rotationally moved so as to be aligned in a straight line from the axis in the radial direction. When the axes of the supply pipes do not coincide, the supply pipe and the horizontal plane are moved in the horizontal direction so that the axes coincide with each other and then rotated. When the plurality of supply pipes are located at different heights, the heights of the tips of the supply pipes are made uniform by moving the supply pipes in the vertical direction. For example, when viewed from the front of the reaction tank, the plurality of supply pipes are rotationally moved so as to be aligned in a straight line on the other side (the direction of 0 o'clock). When the plurality of supply pipes are already arranged in a straight line from the axis in the radial direction, it is not necessary to perform the rotational movement.

  The translation in the radial direction from the vertical line passing through the horizontal plane centroid means that the target supply pipe is translated in the radial direction so as to be separated from the centroid on the horizontal plane. At this time, the supply pipes are translated in the radial direction so that the distances from the horizontal center of gravity of the front ends of the plurality of supply pipes are equal. When the plurality of supply pipes are already arranged at the same distance from the horizontal center of gravity, it is not necessary to horizontally move in the radial direction.

  As described above, each supply pipe is virtually moved on a horizontal plane including each supply pipe (specifically, the front end of the supply pipe), and is rotated and / or translated in the radial direction. Repeat. The plurality of supply pipes may overlap each other from the beginning, and in this case as well, the tips of the supply pipes can be overlapped by rotating the supply pipes and / or translating them in the radial direction as described above. .

  In the water treatment device of the present invention, when the supply pipes are rotated and / or translated in the radial direction as described above and the tips of the supply pipes are stacked, the directions in which the water to be treated is ejected are different from each other. Are provided with a plurality of supply pipes. In addition, the ejection direction of the water to be treated in each supply pipe (direction in which the water to be treated is ejected) can be determined based on the extending direction of the center of the inner diameter of the tip portion of the supply pipe. By providing a plurality of supply pipes in this way, flows in different directions around the horizontal center of gravity of the reaction tank can be formed in the reaction tank. That is, a plurality of flows among the flows (1) to (4) or a plurality of flows (4) can be formed in the reaction vessel.

  The plurality of supply pipes may be provided such that at least two supply pipes form different flows, and preferably at least three supply pipes form different flows. In addition, as long as at least two supply pipes are provided so as to form different flows, a plurality of supply pipes that form the same flow may be provided.

  The treated water channel is provided with a switching means for selecting a supply pipe for introducing treated water into the reaction tank. As the switching means, a switching valve such as a two-way valve or a three-way valve or a regulating valve may be used. The switching valve and adjusting valve may be a manual valve, but it is preferable that the opening / closing and opening degree of the valve can be adjusted electrically or by hydraulic pressure, water pressure, air pressure, or the like. By providing the switching means in the treated water flow path, the supply pipe for introducing the treated water into the reaction tank can be changed over time.

  The water treatment apparatus of the present invention preferably performs treatment as follows by operating the switching means. That is, in the water treatment method using the water treatment apparatus of the present invention, the treated water is supplied to the reaction tank from a part of the plurality of supply pipes, and the treated water is reacted from the other supply pipe. It is preferable to have a step of not supplying to the tank and a step of supplying the water to be treated from the other supply pipe to the reaction tank and not supplying the water to be treated from the partial supply pipe to the reaction tank. By supplying the water to be treated to the reaction tank in this way, the flow of the water to be treated in the reaction tank changes with time, and a different flow of water to be treated can be formed in the reaction tank. As a result, it becomes easy to prevent uneven distribution of solid contents in the reaction tank, and it becomes easy to efficiently treat the water to be treated. The partial supply pipe may be one supply pipe or a plurality of supply pipes, and the other supply pipe may be a single supply pipe or a plurality of supply pipes.

Water treatment method using the water treatment apparatus of the present invention is to provide a large flow rate A ₁ from part supply pipe of the plurality of supply pipes water to be treated into the reaction vessel, treated from the supply pipe of the other portion water below half of the large flow a ₁ into the reaction vessel (and preferably 1/3 times or less, more preferably less 1/4) and supplying a small flow rate of the supply of the other portion Water to be treated is supplied from the pipe to the reaction tank at a large flow rate A ₂ , and the water to be treated is supplied to the reaction tank from the part of the supply pipe to 1/2 or less (preferably 1/3 or less times) of the large flow rate A ₂ And more preferably a step of supplying at a small flow rate of 1/4 times or less). Even when the water to be treated is supplied to the reaction tank in this way, the flow of the water to be treated in the reaction tank can be changed with time, and different flows of water to be treated can be formed in the reaction tank. it can.

  The present invention is particularly suitably used for treating water to be treated in a reaction tank that retains a solid content that tends to settle or is likely to deposit in a compacted state after sedimentation. From this point, it is preferable that the microorganism holding carrier or the granular sludge is held in the reaction tank. Microorganism-holding carriers and granule sludge are easy to settle because of their large particle size, and because they have a certain mass, they tend to accumulate in a compacted state. Therefore, if a microorganism holding carrier and granular sludge are held in the reaction tank, the microorganisms in the reaction tank are formed by changing the flow of different water to be treated in the reaction tank over time according to the present invention. It becomes easy to prevent uneven distribution of the holding carrier and granule sludge, and it becomes easy to efficiently treat the water to be treated. Moreover, it becomes difficult to form a water channel in the reaction tank, and it is prevented that the water to be treated passes through an area where there is almost no microorganism holding carrier or granule sludge and the treatment becomes insufficient. Moreover, when the flow of the water to be treated in the reaction tank is changed, there is an effect that bubbles adhering to the surface of the microorganism holding carrier and the granular sludge are peeled off to prevent their floating.

  In the present invention, it is preferable that an aeration device is not provided in the reaction vessel. Further, it is not necessary to provide a stirring device (for example, a propeller type stirrer). In the present invention, the water to be treated can be stirred in the reaction tank by supplying the water to be treated from the supply pipe to the reaction tank. Treated water and solids (for example, a microorganism holding carrier and granule sludge) can be effectively mixed. For example, the present invention can be suitably used for anaerobically treating the water to be treated. For example, methane fermentation (anaerobic digestion), acid fermentation, denitrification, anaerobic ammonia oxidation, dephosphorization (anaerobic) (Phosphorus release) and the like.

  It is preferable that the reaction tank has a reduced region formed so that the horizontal cross-sectional area gradually decreases toward the bottom at the lower part of the reaction tank. If the lower part of the reaction tank is formed in this way, the solid content is less likely to stay in the corner of the bottom of the reaction tank, and the solid content is less likely to accumulate in that part. The reduced region is more preferably an inverted cone shape in which the outer peripheral wall of the reaction vessel gradually decreases toward the bottom. It is preferable that at least a part of the supply pipe is provided in the reduced region, and this makes it difficult for solid content to stay or accumulate at the bottom of the reaction tank. In addition, the horizontal cross-sectional area of a reaction tank means the cross-sectional area of the reaction tank effective part when a reaction tank is cut | disconnected by the horizontal surface.

  The water treatment apparatus may be provided with a circulation channel that circulates at least a part of the treated water in communication with the outflow part of the reaction tank and the treated water channel. For example, when the water to be treated is not sufficiently treated only by passing the water to be treated once through the reaction tank, it is preferable to return at least a part of the treated water to the water to be treated through the circulation channel. . By returning the treated water in this way, finally treated water that has been highly treated can be obtained.

  When returning the treated water to the reaction tank through the circulation channel, the treated water may be returned to the reaction tank from all the supply pipes, or may be returned to the reaction tank from only some of the supply pipes. For example, if the concentration of the specific component in the raw water is too high, the dominant species of microorganisms in the sludge may change or the activity of the desired microorganisms may be reduced. In addition, undesired side reactions may easily occur in the catalytic reaction. In such a case, the raw water may be diluted with treated water.

  In the reaction tank, the concentration of solids such as microorganisms tends to increase as it goes downward. In such a case, the ratio of raw water to be treated supplied from the supply pipe located below is increased and The ratio of the raw water to be treated supplied from the supply pipe located may be lowered. In this way, by changing the ratio of the raw water and supplying the treated water to the reaction tank, the supply amount of the treated water into the reaction tank is increased to increase the stirring efficiency in the reaction tank, It is possible to efficiently treat the water to be treated by introducing more into a portion having a high solid content concentration that provides a reaction field such as the above.

  Next, the suitable aspect of the water treatment apparatus of this invention, especially the suitable aspect of installation of a supply pipe | tube are demonstrated in detail. The water treatment apparatus of the present invention preferably has a supply pipe provided as follows. That is, it is preferable to have at least two of the following first supply pipe, second supply pipe, and third supply pipe as supply pipes.

In the first supply pipe, the ejection direction of the water to be treated is 0 ° or a positive angle α with respect to the direction from the tip of the first supply pipe to the horizontal center of gravity of the reaction tank. ₁ and an angle of −45 ° to 45 ° with respect to the horizontal plane. The first supply pipe mainly forms a flow in the horizontal direction (direction parallel to the horizontal plane) and forms a flow toward the horizontal center of gravity of the water to be treated or clockwise (clockwise) with respect to the horizontal center of gravity. It is provided with the intention of forming a swirl flow. The angle α _{1 in} the ejection direction of the water to be treated of the first supply pipe projected onto the horizontal plane is determined with reference to a vector R ₁ from the tip of the first supply pipe to the horizontal plane center of gravity of the reaction tank. That is, the vector S ₁ extending from a distal end of the first supply pipe to the ejection direction of the water to be treated and the projection vector T ₁ projected on the horizontal plane, the angle formed between vector R ₁ becomes alpha _1. The first supply pipe, the horizontal projection vector T ₁ of the ejection direction, or toward the same direction as the vector R ₁ to a horizontal plane centroid, 0 ° ultra less than 180 ° counterclockwise to the vector R ₁ to a horizontal plane the center of gravity It is provided so as to go in a shifted direction. With respect to the vertical direction, the first supply pipe is provided so that the vector S _{1 in the} ejection direction is at an angle of −45 ° to 45 ° with respect to the horizontal plane.

In the second supply pipe, the ejection direction of the water to be treated is 0 ° or a negative angle α with respect to the direction from the tip of the second supply pipe to the center of gravity of the horizontal plane of the reaction tank. ₂ and an angle of −45 ° to 45 ° with respect to the horizontal plane. The second supply pipe mainly forms a flow in the horizontal direction, and the water to be treated forms a flow toward the center of gravity of the horizontal plane, or forms a counterclockwise swirl flow with respect to the center of gravity of the horizontal plane. It is provided with the intention. The angle α _{2 in} the ejection direction of the water to be treated of the second supply pipe projected onto the horizontal plane is determined with reference to a vector R ₂ that goes from the tip of the second supply pipe to the horizontal plane center of gravity of the reaction tank. That is, the vector S ₂ extending from the distal end of the second supply pipe in the ejection direction of the water to be treated and the projection vector T ₂ projected on the horizontal plane, the angle formed between vector R ₂ a alpha _2. The second supply pipe, the horizontal projection vector T ₂ of the ejection direction, or toward the same direction as the vector R ₂ to a horizontal plane centroid, 0 ° Ultra 180 ° less displaced clockwise to the vector R ₂ to a horizontal plane the center of gravity It is provided so that it may go to the direction (namely, the direction shifted | deviated to the negative angle). With respect to the vertical direction, the second supply pipe is provided so that the vector S _{2 in the} ejection direction is at an angle of −45 ° to 45 ° with respect to the horizontal plane.

The third supply pipe is provided such that the ejection direction of the water to be treated is at an angle of more than 45 ° and less than 90 ° or between −90 ° and less than −45 ° with respect to the horizontal plane. The third supply pipe is provided mainly with the intention of forming a flow in the vertical direction. In the third supply pipe, the vector S ₃ extending in the direction of ejection of the water to be treated from the tip of the third supply pipe is at an angle of more than 45 ° and less than 90 °, or more than −90 ° and less than −45 ° with respect to the horizontal plane. Is provided. The angle with respect to the horizontal plane takes a positive value when the vector S ₃ upward, takes a negative value when the vector S ₃ downward.

  When the first supply pipe and the second supply pipe are provided as the supply pipes, a flow toward the horizontal plane center of gravity is formed in the reaction tank, either the left swirling flow and the right swirling flow, or the left swirling flow and the right swirling flow. The By providing the supply pipe in this way, it is possible to form different flows of water to be treated in the horizontal direction in the reaction tank. Therefore, the uneven distribution of solid content can be prevented in the reaction tank, and the treatment efficiency of the water to be treated can be increased.

When the first supply pipe and the second supply pipe are provided as the supply pipe, the angle α ₁ formed by the projection vector T _{1 in} the ejection direction of the first supply pipe and the vector R ₁ to the horizontal plane center of gravity, and the ejection direction of the second supply pipe The difference between the projection vector T ₂ and the angle α ₂ formed by the vector R ₂ to the horizontal center of gravity is preferably 45 ° or more, more preferably 60 ° or more, and further preferably 90 ° or more. By providing the first supply pipe and the second supply pipe in this manner, a different flow of water to be treated can be formed in the reaction tank by the first supply pipe and the second supply pipe.

  When the first supply pipe and the third supply pipe or the second supply pipe and the third supply pipe are provided as supply pipes, a flow mainly in the vertical direction and a flow in the horizontal direction are formed in the reaction tank. Will be. In this case as well, it is possible to prevent the uneven distribution of the solid content in the reaction tank and increase the treatment efficiency of the water to be treated.

  The water treatment apparatus of the present invention is preferably provided with a first supply pipe, a second supply pipe, and a third supply pipe. By providing the supply pipe in this way, the flow of the water to be treated is formed in various directions of the horizontal direction and the vertical direction in the reaction tank, and the solid content is more unevenly distributed in the reaction tank. Can be prevented and the treatment efficiency of the water to be treated can be increased.

The first supply pipe is preferably provided so as to form a counterclockwise swirling flow. Therefore, the first supply pipe is preferably provided so that the horizontal projection vector T _{1 in the} ejection direction is at a positive angle α ₁ with respect to the vector R ₁ to the horizontal center of gravity. The angle α ₁ is more preferably 30 ° or more, further preferably 45 ° or more, preferably 120 ° or less, and more preferably 90 ° or less.

The second supply pipe is preferably provided so as to form a clockwise swirling flow. Therefore, it is preferable that the second supply pipe is provided so that the horizontal projection vector T _{2 in the} ejection direction has a negative angle α ₂ with respect to the vector R ₂ to the horizontal center of gravity. The angle α ₂ is more preferably −30 ° or less, still more preferably −45 ° or less, more preferably −120 ° or more, and even more preferably −90 ° or more.

  From the viewpoint of facilitating the formation of an upward flow in the reaction tank, it is preferable that the first supply pipe and the second supply pipe have an ejection direction of water to be treated of −15 ° or more with respect to the horizontal plane, and −5 It is more preferable that the angle be at least. In the third supply pipe, the jet direction of the water to be treated is preferably more than 45 ° and 90 ° or less with respect to the horizontal plane, more preferably 60 ° or more, and further preferably 75 ° or more.

  When the reduced region described above is provided in the reaction tank, it is preferable that the first supply pipe and / or the second supply pipe be provided in this reduced region. If the first supply pipe and the second supply pipe are provided in the reduction area, the water to be treated ejected from the first supply pipe and the second supply pipe hits the inner surface of the reaction tank in the reduction area, thereby A part is converted upward, and it becomes easy to form an upward flow. In addition, a flow of water to be treated is easily formed at the bottom corner of the reaction tank, so that the solid content hardly stays or accumulates at the bottom corner of the reaction tank. Preferably, both the first supply pipe and the second supply pipe are provided in the reduction region.

  When the third supply pipe is provided as the supply pipe, the third supply pipe is preferably provided below the first supply pipe and / or the second supply pipe. Since the third supply pipe mainly forms a flow in the vertical direction, the third supply pipe is provided below the first supply pipe and / or the second supply pipe, so that an upward flow is generated in the entire reaction tank. As a result, it is possible to prevent the solid content from staying or depositing at the bottom of the reaction vessel. The third supply pipe is more preferably provided below the first supply pipe and the second supply pipe. The third supply pipe is also preferably provided at the bottom of the reaction vessel.

  When at least the first supply pipe and the second supply pipe are provided as the supply pipe, the water treatment apparatus of the present invention preferably performs the following treatment by operating the switching means. That is, in the water treatment method using the water treatment apparatus of the present invention, the process of supplying the treated water from the first supply pipe to the reaction tank and not supplying the treated water from the second supply pipe to the reaction tank; It is preferable to have a step of supplying the water to be treated from the supply pipe to the reaction tank and not supplying the water to be treated to the reaction tank from the first supply pipe. By supplying the water to be treated to the reaction tank in this way, the flow of the water to be treated in the reaction tank changes with time, and a different flow of water to be treated in the horizontal direction is formed in the reaction tank. be able to. As a result, it is possible to prevent uneven distribution of solid content in the reaction tank and increase the treatment efficiency of the water to be treated.

When at least the first supply pipe and the second supply pipe are provided as supply pipes, the water treatment method using the water treatment apparatus of the present invention supplies the water to be treated from the first supply pipe to the reaction tank at a large flow rate B ₁ . and, the half of the large flow rate B ₁ to reaction vessel to be treated water from the second supply pipe below (and preferably 1/3 times or less, more preferably less 1/4) supplied at a low flow rate of And supplying the water to be treated from the second supply pipe to the reaction tank at a large flow rate B ₂ , and the water to be treated from the first supply pipe to the reaction tank is ½ times or less of the large flow rate B ₂ (preferably (1/3 times or less, more preferably 1/4 times or less). Even when the water to be treated is supplied to the reaction tank in this way, the flow of the water to be treated in the reaction tank is changed with time, and different water flows are formed in the reaction tank in the horizontal direction. be able to.

  When the first supply pipe, the second supply pipe, and the third supply pipe are provided as the supply pipes, it is preferable to perform the following processing by operating the switching means. That is, the water treatment method using the water treatment apparatus of the present invention supplies the water to be treated to the reaction tank from the first supply pipe and the third supply pipe, and does not supply the water to be treated to the reaction tank from the second supply pipe. It is preferable to have a process and a process which supplies to-be-processed water from a 2nd supply pipe and a 3rd supply pipe to a reaction tank, and does not supply to-be-processed water from a 1st supply pipe to a reaction tank. In this case, since water to be treated is supplied from the third supply pipe in any process, an upward flow is formed in the reaction tank, and the solid content tends to always exist in a floating state. Moreover, since the water to be treated is supplied from the first supply pipe or the second supply pipe along with the flow from the third supply pipe while changing over time, the flow of the water to be treated in the vertical direction can be changed horizontally or swirled. The flow of water to be treated in the direction is added, and uneven distribution of solid content in the reaction tank is less likely to occur. As a result, the treatment efficiency of the water to be treated can be increased. In addition, when supplying to-be-processed water to a reaction tank from a 1st supply pipe and a 3rd supply pipe, or when supplying to-be-processed water to a reaction tank from a 2nd supply pipe and a 3rd supply pipe, from a 3rd supply pipe The flow rate of the treated water to be supplied is preferably larger than the flow rate of the treated water supplied from the first supply pipe, and is preferably larger than the flow rate of the treated water supplied from the second supply pipe. .

  The water treatment method further includes a step of supplying the water to be treated from the third supply pipe to the reaction tank and not supplying the water to be treated to the reaction tank from the first supply pipe and the second supply pipe. Also good. By supplying the water to be treated only from the third supply pipe, it becomes easy to form a strong upward flow in the reaction tank, and the solid matter that has settled in the lower part of the reaction tank is suspended to deposit the solid matter. It becomes easy to prevent.

When the first supply pipe, the second supply pipe, and the third supply pipe are provided as the supply pipe, the water treatment method using the water treatment apparatus of the present invention has a large flow rate of the water to be treated from the third supply pipe to the reaction tank. C ₁ is supplied and the water to be treated is supplied from the second supply pipe at a small flow rate C that is 1/2 times or less (preferably 1/3 times or less, more preferably 1/4 times or less) of the large flow rate C _{1. 2} and supplying the treated water from the first supply pipe to the reaction tank at a medium flow rate less than the large flow rate C _{1 and} greater than the small flow rate C ₂ , and the treated water from the third supply pipe Is supplied at a large flow rate C ₃ , and the water to be treated is supplied to the reaction tank from the first supply pipe to 1/2 times or less (preferably 1/3 times or less, more preferably 1/4 times) of the large flow rate C _3. in a small flow rate is supplied at C _4, the flow rate in more than a second said from the supply pipe less than the high flow rate C ₃ into the reaction vessel treated water small flow C ₄ below) It may have a step of feeding. The water treatment method further water to be treated from the third supply pipe is supplied at a large flow rate C ₅ to the reaction vessel, the large flow C ₅ water to be treated into the reaction vessel from the first supply pipe and the second supply pipe May be provided at a small flow rate of 1/2 times or less (preferably 1/3 times or less, more preferably 1/4 times or less). Even when the water to be treated is supplied to the reaction tank in this way, an upward flow of the water to be treated is formed in the reaction tank, and the solid water is always present in a floating state, while the water to be treated in the reaction tank is present. The flow of water can be changed over time to make it difficult for the solid content to be unevenly distributed in the reaction vessel.

  When the water treatment apparatus of the present invention has at least two of the first supply pipe, the second supply pipe, and the third supply pipe, at least a part of the treated water is circulated in the water treatment apparatus. The circulation channel is preferably provided as follows. That is, the to-be-treated water channel is provided with a first to-be-treated water channel provided with a part of the first supply pipe, the second supply pipe, and the third supply pipe, and another supply pipe. The second treated water flow path is provided, the circulation flow path is provided in communication with the outflow part of the reaction tank and the treated water flow path, and the first treated water flow path is circulated with the raw water flow path to which raw water is supplied. It is preferable that the second treated water flow channel communicates with the flow channel, communicates with the circulation flow channel, and does not communicate with the raw water flow channel.

  In this case, the first treated water flow path and the second treated water flow path are provided with one or two of the first supply pipe, the second supply pipe, and the third supply pipe. Different supply pipes are provided in the channel and the second treated water channel. The raw water is supplied to the reaction tank through the first treated water flow path, and the treated water can be returned to the reaction tank through the first treated water flow path and the second treated water flow path. In this case, it is preferable that the 1st to-be-processed water flow path is connected to the supply pipe | tube which can supply to-be-processed water to the location where the solid content which provides reaction fields, such as microorganisms, becomes high easily. Thus, by providing the 1st treated water channel and the 2nd treated water channel, it becomes possible to treat treated water efficiently. That is, the raw water is introduced through the first treated water flow path into a portion of the reaction tank where the treatment efficiency (activity) is high, and if necessary (for example, the concentration of the characteristic component in the raw water is high and inhibits the activity of microorganisms). The activity in the reaction tank can be kept high by diluting with treated water. Since treated water having a low concentration is introduced into the reaction tank from the second treated water flow path, priority is given to increasing the stirring efficiency in the reaction tank without being restricted by the activity in the reaction tank or the introduction flow rate. It is possible to prevent uneven distribution of solids in the reaction vessel.

  The first treated water flow path is preferably provided with a third supply pipe, and the second treated water flow path is preferably provided with a first supply pipe and / or a second supply pipe. Since the third supply pipe mainly forms a flow directed in the vertical direction, the water to be treated introduced from the third supply pipe is compared with the water to be treated introduced from the first supply pipe or the second supply pipe. The contact frequency with the solid content that provides a reaction field of microorganisms or the like becomes relatively high. Therefore, it becomes easy to improve the processing efficiency in a reaction tank by supplying raw | natural water into a reaction tank from a 3rd supply pipe through a 1st to-be-processed water flow path. Preferably, the first treated water flow path is provided with a third supply pipe, and the second treated water flow path is provided with a first supply pipe and a second supply pipe. In addition, the third supply pipe is preferably provided below the first supply pipe and the second supply pipe, so that the solid content concentration can be increased through the third supply pipe from below the reaction tank where the solid content concentration tends to be high. The treated water is supplied, and the treatment efficiency of the treated water can be increased.

  When the first treated water flow path and the second treated water flow path are provided as the treated water flow paths, the water treatment apparatus of the present invention preferably performs the treatment as follows by operating the switching means. That is, the water treatment method using the water treatment apparatus of the present invention includes a step of supplying treated water to the reaction tank through the first treated water channel and the second treated water channel, and a treated product through the first treated water channel. It is preferable to have a step of supplying the treated water to the reaction tank and not supplying the treated water through the second treated water channel. In this case, the treated water is supplied to the reaction tank in any process from the first treated water flow channel communicating with the raw water flow channel, and a part of the second treated water flow channel not communicating with the raw water flow channel is used. To-be-processed water will be supplied to a reaction tank only from a process. Therefore, the raw water is basically supplied to the reaction tank at all times and is stably processed. On the other hand, since the treated water changes over time and is returned to the reaction tank from the second treated water flow path, different treated water flows with time are formed in the reaction tank. The uneven distribution of solids can be prevented.

  When the first treated water flow path is provided with the third supply pipe and the second treated water flow path is provided with the first supply pipe and the second supply pipe, the treatment is performed as follows by operating the switching means. It is preferable to carry out. That is, the water treatment method using the water treatment apparatus of the present invention supplies the water to be treated to the reaction tank from the first supply pipe and the third supply pipe, and does not supply the water to be treated to the reaction tank from the second supply pipe. Reacting the water to be treated from the second supply pipe and the third supply pipe to the reaction tank, not supplying the water to be treated from the first supply pipe to the reaction tank, and the water to be treated from the third supply pipe It is preferable to have a step of supplying to the tank and not supplying the water to be treated to the reaction tank from the first supply pipe and the second supply pipe. In this case, the raw water is supplied to the reaction tank only from the third supply pipe, but the treated water is supplied from the third supply pipe to the reaction tank in any step, and the first supply pipe and the second supply are supplied. From the pipe, the water to be treated is supplied to the reaction tank from only a part of the process. Therefore, the raw water is basically supplied to the reaction tank at all times and is stably processed. On the other hand, since the treated water is changed over time and returned to the reaction tank from the first supply pipe and the second supply pipe, different flows of water to be treated are formed in the reaction tank at different times. Thus, the uneven distribution of solid content can be prevented in the reaction vessel. In addition, when supplying to-be-processed water to a reaction tank from a 1st supply pipe and a 3rd supply pipe, or when supplying to-be-processed water to a reaction tank from a 2nd supply pipe and a 3rd supply pipe, from a 3rd supply pipe The flow rate of the treated water to be supplied is preferably larger than the flow rate of the treated water supplied from the first supply pipe, and is preferably larger than the flow rate of the treated water supplied from the second supply pipe. .

When the first treated water flow path is provided with the third supply pipe and the second treated water flow path is provided with the first supply pipe and the second supply pipe, the water treatment method using the water treatment apparatus of the present invention is Water to be treated is supplied from the third supply pipe to the reaction tank at a large flow rate D ₁ , and water to be treated is supplied from the second supply pipe to the reaction tank at ½ times or less (preferably 1/3 times) of the large flow rate D _1. or less, more preferably supplied at a low flow rate D ₂ below 1/4), the flow rate in more than less the small flow rate D ₂ than the large flow rate D ₁ water to be treated into the reaction vessel from the first supply pipe And supplying the water to be treated from the third supply pipe to the reaction tank at a large flow rate D ₃ , and the water to be treated from the first supply pipe to the reaction tank is ½ times or less the large flow rate D ₃ ( preferably 1/3 times or less, by supplying more preferably small flow rate D ₄ below 1/4), the high flow D water to be treated into the reaction vessel from the second supply pipe A process of supplying a medium flow rate less than _{3 and a} flow rate higher than the small flow rate D ₄ , and supplying water to be treated from the third supply pipe to the reaction tank at a large flow rate D ₅ , and to be treated from the first supply pipe and the second supply pipe 1/2 of the large flow rate D ₅ water to the reaction vessel below (and preferably 1/3 times or less, more preferably less 1/4) may have a step of supplying a small flow rate of . Even when the water to be treated is supplied to the reaction tank in this way, the flow of the water to be treated in the reaction tank is changed over time while stably treating the water to be treated in the reaction tank. It is possible to make it difficult for the solid content to be unevenly distributed.

  Next, the structural example of the water treatment apparatus of this invention is demonstrated with reference to drawings. The present invention is not limited to the embodiments shown in the drawings.

  In FIG. 1, an example of the water treatment apparatus of this invention was shown. The water treatment apparatus 1 (1A) is provided in the reaction tank 2 for treating the water to be treated, the water to be treated flow path 3 to which the water to be treated is transferred to the lower part of the reaction tank 2, and the water to be treated 3 A supply pipe 4 through which treated water is introduced into the reaction tank 2 and an outflow part 5 through which the treated water flows out are provided above the reaction tank 2. The water treatment apparatus 1 </ b> A is provided with a first supply pipe 4 </ b> A, a second supply pipe 4 </ b> B, and a third supply pipe 4 </ b> C as the supply pipe 4, and each supply pipe 4 reaches the outflow part 5 from the bottom of the reaction tank 2. It is provided in a 1/3 region in the height direction. In addition, the reaction tank 2 has a reduced area 2R formed so that the horizontal cross-sectional area gradually decreases toward the bottom, and each supply pipe 4 is provided in the reduced area 2R. The treated water flow path 3 is provided with a two-way valve as the switching means 6, and the switching means 6 can select the supply pipe 4 for introducing the treated water into the reaction tank 2. . In the water treatment apparatus 1 </ b> A shown in FIG. 1, the treated water flow path 3 communicates with the raw water flow path 7 to which the raw water is supplied, so that the raw water can be supplied to each supply pipe 4.

  In FIG. 1, the first supply pipe 4 </ b> A and the second supply pipe 4 </ b> B are connected to the side surface of the reaction tank 2 and the third supply pipe 4 </ b> C is connected to the bottom of the reaction tank 2 in the reduced region 2 </ b> R. . The first supply pipe 4A and the second supply pipe 4B are provided so that the ejection direction of the water to be treated is an angle of 0 ° with respect to the horizontal plane, that is, the water to be treated is ejected in the horizontal direction. Yes. On the other hand, the third supply pipe 4C is provided such that the direction of ejection of the water to be treated is 90 ° with respect to the horizontal plane, that is, the water to be treated is ejected in the vertical direction.

  The ejection direction of the water to be treated from each supply pipe 4 will be described in detail with reference to FIGS. FIG. 2 is a schematic diagram showing the ejection direction of water to be treated from the first supply pipe and the second supply pipe in a horizontal plane including the first supply pipe and the tip of the second supply pipe, with respect to the reaction tank shown in FIG. FIG. 3 is a schematic diagram showing the ejection direction of water to be treated from each supply pipe when the lower part of the reaction tank is viewed from the side. Note that the water treatment apparatus shown in FIG. 1 is configured such that the center of gravity of the cross section of the reaction tank in the horizontal plane including the tip of each supply pipe coincides when viewed from above the reaction tank.

The first supply pipe 4A is a vector S ₁ representing the ejection direction of the water to be treated extends in horizontal direction, it coincides with the horizontal plane projection vector T ₁ of the vector S _1. The projection vector T ₁ is formed so as to be directed counterclockwise with respect to the vector R ₁ that is directed from the tip of the first supply pipe 4A toward the horizontal plane center of gravity G of the reaction tank 2, and is positive with respect to the vector R ₁ . an angle alpha ₁ (approximately 85 °). When the water to be treated is introduced into the reaction tank 2 from the first supply pipe 4 </ b> A, a counterclockwise swirling flow is formed in the reaction tank 2.

Second supply pipe 4B is a vector S _2, which represents the injection direction of water to be treated extends in horizontal direction, coincides with the horizontal plane projection vector T ₂ of the vector S _2. The projection vector T ₂ is formed so as to be directed in a clockwise direction with respect to the vector R ₂ that is directed from the tip of the second supply pipe 4B toward the horizontal center of gravity G of the reaction tank 2, and has a negative angle with respect to the vector R _2. α ₂ (about −85 °) is formed. The difference between the angle α ₁ and the angle α ₂ is about 170 °. When the water to be treated is introduced into the reaction tank 2 from the second supply pipe 4B, a clockwise swirling flow is formed in the reaction tank 2.

Third supply pipe 4C is a vector S ₃ representing the ejection direction of the water to be treated is provided so that an angle of 90 ° to the horizontal plane. By introducing the water to be treated into the reaction tank 2 from the third supply pipe 4 </ b> C, a vertically upward flow of the water to be treated is formed in the reaction tank 2. In the drawing, the third supply pipe 4 </ b> C is provided below the reaction tank 2 than the first supply pipe 4 </ b> A and the second supply pipe 4 </ b> B, and an upward flow is easily formed in the entire reaction tank 2. Yes.

The first supply pipe 4A, the second supply pipe 4B, and the third supply pipe 4C are configured so that the supply pipe 4 is rotated and / or radiated from the axis with a vertical line passing through the horizontal center of gravity G of the reaction tank 2 as an axis. When the leading ends of the supply pipes 4 are overlapped by parallel movement, the ejection directions S ₁ , S ₂ , S _{3 of the} water to be treated are different from each other. For example, the first supply pipe 4A and the second supply pipe 4B are provided with the first supply pipe 4A when the first supply pipe 4A is rotationally moved about the horizontal plane center of gravity G and the ends of the first supply pipe 4B and the second supply pipe 4B overlap each other. ejection direction S ₁ of the tube 4A and the injection direction S ₂ of the second supply pipe 4B is disposed so as to form an angle difference of about 170 ° on a horizontal plane. The first supply pipe 4A and the third supply pipe 4C are overlapped so that the center of gravity G coincides with each other, and the third supply pipe 4C is translated from the horizontal plane center of gravity G in the radial direction. when superimposed tip of one another, ejection direction S ₁ and ejection direction S ₃ of the third supply pipe 4C of the first supply pipe 4A is provided so as to form an angular difference of 90 °.

  The water treatment apparatus 1 </ b> A can change the supply pipe 4 for introducing the water to be treated into the reaction tank 2 over time by operating the switching unit 6. Examples of the water treatment method using the water treatment apparatus 1A include a step of supplying the water to be treated to the reaction tank 2 from the first supply pipe 4A and not supplying the water to be treated to the reaction tank 2 from the second supply pipe 4B. It is preferable that the process water is supplied to the reaction tank 2 from the second supply pipe 4B and the process water is not supplied to the reaction tank 2 from the first supply pipe 4A. Moreover, the water treatment method using the water treatment apparatus 1A supplies the water to be treated to the reaction tank 2 from the first supply pipe 4A and the third supply pipe 4C, and the water to be treated from the second supply pipe 4B to the reaction tank 2. The process water is supplied to the reaction tank 2 from the second supply pipe 4B and the third supply pipe 4C, and the process water is not supplied to the reaction tank 2 from the first supply pipe 4A. Further, there is a step of supplying the water to be treated from the third supply pipe 4C to the reaction tank 2 and not supplying the water to be treated to the reaction tank 2 from the first supply pipe 4A and the second supply pipe 4B. It may be. In either case, the flow of water to be treated in the reaction tank 2 changes with time, and a different flow of water to be treated can be formed in the reaction tank 2. As a result, it is possible to prevent uneven distribution of the solid content in the reaction tank 2 and increase the treatment efficiency of the water to be treated.

  FIG. 4 shows a modification of the water treatment apparatus shown in FIG. In the following description regarding the water treatment apparatus shown in FIG. 4, the description overlapping with the description of FIG. 1 is omitted.

  In the water treatment apparatus 1 (1B) shown in FIG. 4, a circulation channel 8 is provided that communicates with the outflow part 5 of the reaction tank 2 and the water channel 3 to be treated and circulates at least a part of the treated water. . And the raw | natural water flow path 7 to which raw | natural water is supplied is provided in communication only with the 3rd supply pipe | tube 4C. That is, as the treated water flow path 3, the first treated water flow path 3 </ b> A communicating with the raw water flow path 7 and the circulation flow path 8, the second communication water communicating with the circulation flow path 8, and not communicating with the raw water flow path 7. A treated water flow path 3B is provided. The first treated water flow path 3A is provided with a third supply pipe 4C, and the second treated water flow path 3B is provided with a first supply pipe 4A and a second supply pipe 4B.

  As a water treatment method using the water treatment apparatus 1B, for example, treated water is supplied from the first supply pipe 4A and the third supply pipe 4C to the reaction tank 2, and the treated water is supplied from the second supply pipe 4B to the reaction tank. A process of not supplying the water to the reaction tank 2, a process of supplying the water to be treated from the second supply pipe 4B and the third supply pipe 4C to the reaction tank 2, and a process of not supplying the water to be treated to the reaction tank 2 from the first supply pipe 4A; It is preferable to have a step of supplying the water to be treated from the 3 supply pipe 4C to the reaction tank 2 and not supplying the water to be treated to the reaction tank 2 from the first supply pipe 4A and the second supply pipe 4B. In this case, the water to be treated is supplied to the reaction tank 2 from the third supply pipe 4C in any process, and the water to be treated is only supplied from a part of the processes from the first supply pipe 4A and the second supply pipe 4B. 2 will be supplied. Therefore, the raw water is basically supplied to the reaction tank 2 at all times and is stably processed. On the other hand, since the treated water changes over time and is returned to the reaction tank 2 from the first supply pipe 4A and the second supply pipe 4B, the flow of different water to be treated in the reaction tank 2 is timed. It is possible to prevent uneven distribution of solids in the reaction tank 2.

  From the third supply pipe 4C, it is possible to operate the switching means 6 to supply only raw water or to mix and supply raw water and treated water. For example, the mixed water may be always supplied from the third supply pipe 4C in all of the three steps described above. In addition, a process of supplying the water to be treated to the reaction tank 2 from the first supply pipe 4A and the third supply pipe 4C and not supplying the water to be treated to the reaction tank 2 from the second supply pipe 4B, In the step of supplying the treated water from the third supply pipe 4C to the reaction tank 2 and not supplying the treated water from the first supply pipe 4A to the reaction tank 2, only the raw water is supplied from the third supply pipe 4C, You may supply the mixed water which made the flow volume of the treated water small.

  The present invention is caused by processing of sewage, human waste, process wastewater generated by sewage treatment and human waste processing, factory wastewater generated from food factories, paper pulp factories, chemical factories, etc., livestock waste such as animal manure, animal manure, etc. It can be used for the treatment of wastewater.

1: water treatment device 2: reaction tank 3: treated water flow path, 3A: first treated water flow path, 3B: second treated water flow path 4: supply pipe, 4A: first supply pipe, 4B: second supply Pipe, 4C: 3rd supply pipe 5: Outflow part 6: Switching means 7: Raw water flow path 8: Circulation flow path

Claims (17)

A reaction tank for treating the water to be treated;
To-be-treated water flow path to which the to-be-treated water is transferred to the lower part of the reaction tank,
A supply pipe provided in the treated water flow path, into which the treated water is introduced into the reaction tank;
A water treatment device having an outflow part through which treated water flows out at the upper part of the reaction tank,
A plurality of the supply pipes are provided in a lower 1/3 region in the height direction from the bottom of the reaction tank to the outflow part,
The plurality of supply pipes, when the tips of the supply pipes are overlapped by rotational movement around the vertical line passing through the horizontal center of gravity of the reaction tank and / or parallel movement in the radial direction from the axis, The direction in which the water to be treated is ejected is different from each other,
The water treatment apparatus according to claim 1, wherein a switching means for selecting a supply pipe for introducing the water to be treated into the reaction tank is provided in the water passage to be treated. The reaction vessel has a reduced region formed in the lower portion so that the horizontal cross-sectional area gradually decreases toward the bottom,
The water treatment apparatus according to claim 1, wherein the supply pipe is provided in the reduced region.   The water treatment apparatus according to claim 1 or 2, wherein a microorganism holding carrier or granular sludge is held in the reaction tank.   The water treatment apparatus according to any one of claims 1 to 3, wherein a circulation passage is provided in communication with the outflow portion of the reaction tank and the water passage for treatment to circulate at least part of the treatment water. . The supply pipe has at least two of a first supply pipe, a second supply pipe, and a third supply pipe,
In the first supply pipe, the ejection direction of the water to be treated is 0 ° or a positive angle α with respect to the direction from the tip of the first supply pipe to the horizontal center of gravity of the reaction tank. ₁ and an angle of −45 ° to 45 ° with respect to the horizontal plane,
In the second supply pipe, the ejection direction of the water to be treated is 0 ° or a negative angle α with respect to the direction from the tip of the second supply pipe to the center of gravity of the horizontal plane of the reaction tank. ₂ and an angle of −45 ° to 45 ° with respect to the horizontal plane,
The third supply pipe is provided such that the ejection direction of the water to be treated is an angle of more than 45 ° to 90 ° or less or −90 ° to less than −45 ° with respect to the horizontal plane. The water treatment apparatus according to claim 1. The supply pipe has at least a first supply pipe and a second supply pipe,
The water treatment apparatus according to claim 5, wherein a difference between the angle α ₁ and the angle α ₂ is 45 ° or more. The supply pipe has at least a third supply pipe;
The water treatment apparatus according to claim 5 or 6, wherein the third supply pipe is provided below the first supply pipe and / or the second supply pipe. The treated water flow path includes a first treated water flow path provided with a part of the first supply pipe, the second supply pipe, and the third supply pipe, and another supply pipe. It is composed of a second treated water channel,
A circulation channel that circulates at least part of the treated water is provided in communication with the outflow part of the reaction tank and the treated water channel,
The first treated water flow channel communicates with the raw water flow channel to which the raw water is supplied and the circulation flow channel,
The water treatment apparatus according to any one of claims 5 to 7, wherein the second treated water flow path communicates with the circulation flow path and does not communicate with the raw water flow path. The supply pipe has a first supply pipe, a second supply pipe, and a third supply pipe,
The water treatment device according to claim 8, wherein a third supply pipe is provided in the first treated water flow path, and a first supply pipe and a second supply pipe are provided in the second treated water flow path. A water treatment method using the water treatment device according to any one of claims 1 to 9,
Supplying the water to be treated from a part of the plurality of supply pipes to the reaction tank, and not supplying the water to be treated from the other supply pipe to the reaction tank;
A water treatment method comprising a step of supplying treated water from a supply pipe of the other part to a reaction tank and not supplying treated water from the partial supply pipe to the reaction tank. A water treatment method using the water treatment device according to any one of claims 5 to 9,
The supply pipe has at least a first supply pipe and a second supply pipe,
Supplying the water to be treated from the first supply pipe to the reaction tank and not supplying the water to be treated from the second supply pipe to the reaction tank;
A water treatment method comprising a step of supplying water to be treated from a second supply pipe to a reaction tank and not supplying water to be treated from the first supply pipe to the reaction tank. A water treatment method using the water treatment device according to any one of claims 5 to 9,
The supply pipe has a first supply pipe, a second supply pipe, and a third supply pipe,
Supplying the water to be treated from the first supply pipe and the third supply pipe to the reaction tank, and not supplying the water to be treated from the second supply pipe to the reaction tank;
A water treatment method comprising a step of supplying treated water from a second supply pipe and a third supply pipe to a reaction tank, and not supplying treated water from the first supply pipe to the reaction tank.   Furthermore, the water treatment method of Claim 12 which has a process which supplies to-be-processed water to a reaction tank from a 3rd supply pipe, and does not supply to-be-processed water to a reaction tank from a 1st supply pipe and a 2nd supply pipe. A water treatment method using the water treatment device according to claim 8 or 9,
Supplying the treated water to the reaction tank through the first treated water channel and the second treated water channel;
A water treatment method comprising a step of supplying treated water to the reaction tank through the first treated water flow path and not supplying treated water through the second treated water flow path. A water treatment method using the water treatment device according to claim 9,
Supplying the water to be treated from the first supply pipe and the third supply pipe to the reaction tank, and not supplying the water to be treated from the second supply pipe to the reaction tank;
Supplying the water to be treated from the second supply pipe and the third supply pipe to the reaction tank, and not supplying the water to be treated from the first supply pipe to the reaction tank;
A water treatment method comprising: supplying water to be treated from a third supply pipe to a reaction tank; and not supplying water to be treated from the first supply pipe and the second supply pipe to the reaction tank. A water treatment method using the water treatment device according to any one of claims 1 to 9,
The treated water is supplied to the reaction tank from a part of the plurality of supply pipes at a large flow rate, and the treated water is supplied from the other supply pipe to the reaction tank at a flow rate less than 1/2 times the large flow rate. The process of supplying in
Supplying water to be treated from the other supply pipe to the reaction tank at a large flow rate and supplying the water to be treated from the partial supply pipe to the reaction tank at a small flow rate that is ½ times or less of the large flow rate A water treatment method characterized by comprising: A water treatment method using the water treatment device according to claim 9,
Water to be treated is supplied from the third supply pipe to the reaction tank at a large flow rate, and water to be treated is supplied from the second supply pipe to the reaction tank at a small flow rate that is 1/2 times or less of the large flow rate. Supplying the water to be treated to a reaction tank at a medium flow rate less than the large flow rate and larger than the small flow rate,
Water to be treated is supplied from the third supply pipe to the reaction tank at a large flow rate, and water to be treated is supplied from the first supply pipe to the reaction tank at a small flow rate that is ½ times or less of the large flow rate. Supplying the water to be treated to a reaction tank at a medium flow rate less than the large flow rate and larger than the small flow rate,
Water to be treated is supplied from the third supply pipe to the reaction tank at a large flow rate, and water to be treated is supplied from the first supply pipe and the second supply pipe to the reaction tank at a small flow rate that is ½ times or less of the large flow rate. A water treatment method comprising a step.

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