JP2006326387A - Aeration tank structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aeration tank structure which can carry out water purification without installing a special separator and the like for discharging suspended matter, and can be made to be simple and low-priced. <P>SOLUTION: In an aeration tank 2 comprising a first aeration tank 10 for aerating stored raw water and discharging it from a delivery port 16, and a second aeration tank 11 for aerating intermediate treated water flowing in from the first aeration tank 10 and discharging it from a delivery port 25 to outside, a return pipe 27 of which the suction port 30 opens adjacent to the tank bottom wall on the delivery port 25 side of the second aeration tank 11 is installed. The intermediate treated water of the second aeration tank 11 is returned to the first aeration tank 10 from the suction port 30 through the return pipe 27 to be purified. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an aeration tank structure for purifying sewage sludge such as general household and industrial wastewater, and okara, shochu waste or manure, grease trap water containing oil during food processing, and the like.

Conventionally, when raw water to be treated (hereinafter simply referred to as raw water) made of organic sludge, such as domestic wastewater, food processing wastewater, and industrial wastewater, is aerated in an aeration tank (aeration tank), the wood used as the processing medium in the aeration tank A wastewater treatment apparatus that mixes fine pieces (wood chips) and stirs with raw water to treat organic sludge so as to reduce the BOD value or the like by the decomposition of bacteria is already known (for example, Patent Document 1).
Japanese Examined Patent Publication No. 4-10398

  The raw water wastewater treatment apparatus disclosed in Patent Document 1 stirs wood chips that are unlikely to clog fine channels in the medium in the aeration tank, and reduces organic sludge by reducing the BOD value, etc., by bacterial decomposition. There are features that can be done. However, this aeration tank has a special shape because the aeration tank is provided with a sedimentation chamber in which the central part of the tank is partitioned by a reverse fan-shaped partition plate above the digestion chamber (first aeration tank) for aeration treatment. It becomes long in the vertical direction. Further, when configuring a treatment facility in which aeration tanks are connected in multiple stages, there is a drawback that the connection structure of adjacent aeration tanks is complicated and the cost is increased.

  Furthermore, when aeration is performed by blowing air from a vertical air diffuser in the digestion chamber below the sedimentation chamber, the bubbling and vibration of the intermediate treatment water is transmitted from the communication port opened at the bottom of the sedimentation chamber, and the sedimentation chamber is made stationary. Structural problems such as inability to perform rapid sedimentation due to the updraft and rippling of the liquid surface (water surface), and suspended solids containing fine particles of wood chips floating on the water surface. There is. For this reason, when the water surface fluctuates downwardly, there is a problem that a large amount of suspended solids are mixed in a pipe (sending pipe) for sending the supernatant liquid and water is easily fed or clogged.

  The aeration tank structure for solving the above-mentioned problem is firstly aerated with the first aeration tank 10 for aeration of the stored raw water and flowing out from the outlet 16 and the intermediate treated water flowing in from the first aeration tank 10. In the aeration tank 2 composed of the second aeration tank 11 to be processed and discharged to the outside from the delivery outlet 25, a return device 26 that opens with the suction port 30 close to the tank bottom wall on the delivery outlet 25 side of the second aeration tank 11. The return pipe 27 is provided, and the intermediate treated water in the second aeration tank 11 is returned from the suction port 30 to the first aeration tank 10 through the return pipe 27.

  Secondly, an air pipe 15 and a return pipe 27 are provided on the upstream side and the downstream side in the second aeration tank 11, a partition wall 20 is provided between the air pipe 15 and the return pipe 27, and the upstream aeration chamber 17. The aeration chamber 17 and the discharge chamber 19 are connected between a guide wall 21 formed by bending the lower side of the partition wall 20 toward the upstream side and the tank bottom wall. An inflow interval 22 is formed.

  Thirdly, an air pipe 29 for blowing air into the suction port 30 of the return pipe 27 is provided, and an upward flow is generated in the return pipe 27 by the air, leading to intermediate treated water on the bottom wall side of the discharge chamber 19. It is characterized by being returned to one aeration tank 10.

  Fourth, a partition wall 12 having a delivery port 16 in the aeration tank 2 forms a first aeration tank 10 and a second aeration tank 11, and maintenance is performed above the first aeration tank 10 and the second aeration tank 11. A feature is that a work port 33 for work is provided.

  Fifth, the delivery port 16 or the delivery port 25 is formed by a delivery pipe made of a horizontal pipe, and a middle part of the longitudinal pipe forming the lower vertical pipe part 31 and the upper vertical pipe part 32 is formed on the feed side of the delivery pipe. It connects, The opening part of the lower vertical pipe part 31 and the upper vertical pipe part 32 is each located in the predetermined | prescribed depth and height from a liquid level, It is characterized by the above-mentioned.

  According to the present invention configured as described above, a part of the intermediate treated water in the second aeration tank 11 that has been aerated in the first aeration tank 10 and sent in is introduced from the suction port 30, and the tank bottom wall side Since the contaminants and the like are returned to the first aeration tank 10 by the return pipe 27 and reprocessed, the intermediate treatment water in the second aeration tank 11 can be purified more reliably. In addition, water purification can be performed without specially providing a separation device or the like for discarding suspended matters in the second aeration tank 11 to the outside, and the aeration tank 2 can be configured to be simple and inexpensive.

  In the second aeration tank 11, the aeration chamber 17 and the discharge chamber 19 are provided between the guide wall 21 in which the lower side of the partition wall 20 that partitions the aeration chamber 17 and the discharge chamber 19 is bent upstream, and the tank bottom wall. By forming the inflow interval 22 for communication, the intermediate treated water that convects and descends along the partition wall 20 can be guided upstream. In addition, it is possible to prevent the accumulation of contaminants on the tank bottom wall in the vicinity of the inflow interval 22 by the guidance, and it is possible to suppress the discharge movement of untreated contaminants into the discharge chamber 19 by the inflow interval 22.

  The intermediate treated water flowing into the discharge chamber 19 is sucked together with foreign substances from the suction port 30 on the downstream side of the inflow interval 22 and returned to the first aeration tank 10 while performing the aeration process in the return pipe 27, thereby Floating matters and impurities in 19 can be returned to the first aeration tank 10. Further, clean treated water can be taken out by suppressing the generation of the upward flow in the discharge chamber 19 and promoting the sedimentation action of the intermediate treated water.

  The inside of the aeration tank 2 can be partitioned by the partition wall 12, and the first aeration tank 10 and the second aeration tank 11 can be easily formed. Moreover, the 1st aeration tank 10 and the 2nd aeration tank 11 are comprised sideways, and an internal maintenance operation | work can be easily performed from the work port 33 provided in each.

  By connecting the middle part of the vertical pipe forming the lower vertical pipe part 31 and the upper vertical pipe part 32 to the feed side of the delivery pipe of the horizontal pipe forming the delivery port, the opening of the lower vertical pipe part 31 is formed. It can be located at a predetermined depth from the liquid surface to prevent the floating substances from being mixed and to feed water. In addition, the opening of the upper vertical pipe part 32 is positioned above the fluctuation level of the liquid level to prevent the entry of suspended matter, and the liquid level in the upper vertical pipe part 32 is freely changed to prevent clogging in the pipeline. And cleaning can be facilitated.

  Embodiments of the present invention shown in the drawings will be described below. FIG. 1 is a plan view schematically showing the configuration of a treatment facility (treatment device) 1 for purifying organic sludge containing okara discharged during tofu production (hereinafter simply referred to as raw water). This treatment facility 1 includes a primary treatment device 3 in which aeration tanks 2 according to the present invention for aeration treatment of raw water are connected in series, and treated purified water sent from the final aeration tank 2 of the primary treatment device 3. Is made up of a reaction tank 4 that decomposes into carbon dioxide gas and water through a wood chip (wood piece) A filled as a microbial medium agent (treatment medium) described later.

  The treatment facility 1 supplies an input tank 5 for storing raw water to be supplied to the first-stage aeration tank 2 of the primary treatment apparatus 3, treated water (purified water) sent out from the reaction tank 4, and is supplied as needed from the outside. A water storage tank 6 for storing the tap water to be used is provided. The water storage tank 6 can take out the stored water to the outside, and can supply a predetermined amount of water to the input tank 5 as dilution water for raw water. For example, when the length of the aeration tank 2 is set to about 810 cm, the charging tank 5 is set to about 450 cm, the water storage tank 6 is set to about 370 cm, and the combined length of both is made substantially equal to the length of the aeration tank 2. Desirable for configuring a treatment facility.

  In the aeration tank 2 and the reaction tank 4, wood chips having a function adapted to each treatment, that is, wood chips (microorganism habitat organic filter material) are introduced, and the raw water is wet treated by the primary treatment device 3 to be described later. A primary treatment is performed, and the primary treated water (treated purified water) is supplied to the reaction tank 4 to perform a dry secondary treatment to obtain clean purified water as the secondary treated water. The purified water treated at this treatment facility 1 can be cleared as described below for the discharge standard value to the sewage and the river discharge standard value, and can be recovered in the water storage tank 6 without being discarded and used as dilution water for raw water. It enables recycling.

The wood chip A and the wood chip B used in the processing facility 1 both use wood chips obtained by pulverizing thinned wood of conifers such as cedars and straws into chips, thereby producing and treating the wood chips. This makes it easier to handle.
For this wood chip A and wood chip B, ordinary sawdust and wood chips are not used as they are, but for example, those produced by applying a stirring cleaning process as shown in Patent Document 2 to the wood chips are used. It is desirable.

  That is, the wood pieces used in the embodiment are obtained by stirring and removing fine particles (fine powder) and various fungi, which are obtained by stirring fine pieces of crushed coniferous trees such as cedar in water. It is assumed that it has been subjected to a degree of stirring and washing treatment. As a result, the wood chips are manufactured to have a very large surface area by complicating the structure of the fragments, and the carbonaceous organic material is about 65% cellulose, 25% lignin, and about 10% pentosan.

In addition, it is easy to treat wood chips with microbes and make them porous, and it has a large surface area and can come into contact with sludge water to generate colonies of many bacterial bodies (gonococci, cocci, etc.) inside. .
In addition, it provides an environment in which microorganisms (bacteria) can suitably grow due to the characteristics of the wood chips that have been agitated and washed, and suppresses clogging caused by fine powders during long-term water purification treatment, and the natural organic nature of wood. Since the organization is maintained, water purification can be performed stably and inexpensively.

  Therefore, in this embodiment, the wood chip A that is used in a large amount in the reaction tank 4 is used as it is without inoculating the above-described stirred and washed wood chips, so that water retention, adsorptivity and drainage can be obtained. The water content is rapidly adjusted, the porosity is maintained, and the generation of oxygen is suitably performed. In addition, when it comes into contact with sludge water, it becomes a family of digestive bacteria including soil bacteria, and keeps the aerobic and anaerobic bacteria generated there in the same body and promotes sludge extinction. Then, solid substances contained in organic sludge water and suspended solids (SS) and substances that make sludge water containing animal and plant proteins, fats, carbohydrates, etc. are converted into water and carbon dioxide by the digestive action by fermentation decomposition of microbial media material. can do.

  The wood chip B uses the same wood chip as the wood chip A, in which cells such as chlorella, sorghum, and soil bacteria are inoculated in advance by a known inoculation means. As a result, when the wood chip B is stirred in the raw water and comes into contact with the sludge while being deformed in various ways, the water purification treatment is promoted while adding the specific functions of each cell.

  A chip or ball-shaped treatment made of a bark material that assists in the decomposition of raw water together with the wood chip B, or a plastic material that comes into physical contact with large solids or contaminants in the raw water during stirring. The auxiliary material can be mixed at a predetermined ratio as necessary. The ratio of mixing wood chips B and the like into the aeration tank 2 is determined in consideration of the volume of raw water stored in each aeration chamber, the degree of water purification treatment, the treatment method, and the like.

  Next, the structure of each part of the processing facility 1 will be described. First, the aeration tank 2 will be described with reference to FIGS. This aeration tank 2 is a sealable rectangular tank, and is provided with a partition wall 12 formed by dividing a first aeration tank (adjusted aeration tank) 10 and a second aeration tank (aeration tank) 11 into left and right sides. Yes. In the embodiment, when the aeration tank 2 has a total length of about 810 cm, the partition wall 12 is positioned such that the length of the first aeration tank 10 is about 540 cm and the length of the second aeration tank 11 is about 270 cm. Thus, the raw water is agitated with the wood chip B and the like in a horizontally long first aeration tank 10 for a sufficient time to perform the primary treatment.

  The first aeration tank 10 includes a connection pipe 13 serving as a supply port for supplying raw water from the charging tank 5 on an upper side of the left wall of the tank, and an air pipe 15 connected to an air pressure feeding device installed on the management facility side (not shown). Is provided so that air is blown out from a position close to the connecting pipe 13 and the bottom of the tank. As a result, air is ejected from the upper side (upstream side) in the processing direction, and aeration is performed by generating convection toward the lower side (downstream side) in the processing direction while agitating the wood chip B with the raw water.

Further, the partition wall 12 is provided with a delivery pipe 16 serving as a delivery outlet at a position slightly below the connection pipe 13 so that the first aeration tank 10 and the second aeration tank 11 on the downstream side are communicated with each other.
The second aeration tank 11 is provided with a partition wall 20 formed by dividing the aeration chamber 17 and the discharge chamber 19 into left and right sides. The partition wall 20 is provided at a position where the capacity of the aeration chamber 17 is larger than the capacity of the discharge chamber 19, and guides the convection direction of the raw water to the lower side of the partition wall 20 and guides the inflow movement toward the second aeration tank 11. A wall 21 is formed.

  The guide wall 21 is gently curved toward the aeration chamber 17 side, and the height of the inflow port (hereinafter referred to as the inflow interval) 22 formed by the tip portion thereof and the bottom wall of the aeration tank 2 is about 30 mm to 50 mm. It is set to. As a result, large contaminants in the first aeration tank 10 and untreated solid matter deposited on the bottom wall side are restricted from flowing directly into the discharge chamber 19 by the inflow interval 22, and the first aeration tank 10 Is fully processed.

  The aeration chamber 17 of the second aeration tank 11 is provided with an air tube 23 similar to the air tube 15 for injecting air to a lower position in the vicinity of the delivery tube 16 provided on the partition wall 12. As a result, the intermediate treated water supplied from the first aeration tank 10 via the delivery pipe 16 is aerated while being mixed with the wood chips B by air jetted from the upstream side in the second aeration tank 11.

  In the discharge chamber 19, a delivery pipe 25 that discharges treated water (treated water) treated in the second aeration tank 11 is provided at substantially the same height as the delivery pipe 16 at the upper part of the right wall of the tank. The liquid level heights of the first aeration tank 10 and the second aeration tank 11 in the aeration tank 2 are maintained at a substantially constant height position below the connection pipe 13 by a predetermined distance.

In the discharge chamber 19, a return device 26 is installed between the delivery pipe 25 and the partition wall 20 to return a part of the intermediate treated water on the bottom side in the discharge chamber 19 to the first aeration tank 10. The return device 26 in the illustrated example includes an inverted L-shaped return tube 27 and an air tube 29.
The return pipe 27 has a horizontal pipe portion positioned above the liquid level and is inserted into and supported by the central portion of the partition wall 20 and the partition wall 12, and a vertical pipe portion is provided close to the partition wall 20 so as to expand. The lower end opening formed in FIG. 4 is used as a suction port 30 and faces the vicinity of the inflow interval 22.

  The air pipe 29 is supported with its open end facing the suction port 30 of the return pipe 27, and air can be vigorously fed into the opening 30 from the air pressure feeding device. With this configuration, a strong upward flow can be generated in the return pipe 27 and a part of the intermediate treated water (second treated water) immediately after flowing into the discharge chamber 19 through the inflow interval 22 is guided and sucked up. Then, the aeration tank is returned to the first aeration tank 10 and the intermediate treatment water is vigorously stirred in the pipe to effectively perform the aeration treatment.

  In this embodiment, the delivery pipe 16 and the delivery pipe 25 made of horizontal pipes, which are mounted and supported at substantially the same height position on the partition wall 12 and the right wall of the aeration tank 2, are provided with vertical pipes on the respective feeding sides. The middle part is connected to form a T-shaped tube. With this configuration, the longitudinal pipes of the delivery pipe 16 and the delivery pipe 25 are designed to pump out the opening of the lower longitudinal pipe section 31 from a depth position of about 60 cm from the liquid surface (water surface) while preventing the entry of suspended matter. Can be sent to the water.

In addition, by setting the opening of the upper vertical pipe portion 32 at a height of about 25 cm from the water surface, it is possible to regulate the invasion of suspended matter even when the water surface fluctuates or waves.
Further, since the lower vertical pipe portion 31 and the upper vertical pipe portion 32 are opened straight up and down, the inside of the pipe and the delivery pipe 16 and the delivery pipe 25 can be easily cleaned from above.

  The number and positions of the delivery pipes 16 and delivery pipes 25 can be appropriately set according to the size and shape of the aeration tank 2 and the processing amount. Moreover, it is desirable that the diameter of each pipe line is about 10 cm or more. In addition, the return device 26 is a method in which air is pumped into the return pipe 27 to generate an upward flow, but the intermediate treated water in the second aeration tank 11 is returned to the first aeration tank 10 by another type of pump device. You can also.

  Further, when the aeration tank 2 configured as shown in the drawing is relatively small, a manure processing tank (septic tank) that is generally marketed and used for home use or business use can be used. In this case, the first aeration tank 10, the second aeration tank 11, etc. are put into the septic tank by simple modification means such as additional processing of the partition wall 12, the partition wall 20, the return device 26, etc. in the manure processing tank. There are advantages such that they can be manufactured together at low cost, and the installation work etc. can be easily performed by the partial improvement type.

In addition, the aeration tank 2 that is partitioned by the partition wall 12 and is manufactured by the horizontal integrated structure of the first aeration tank 10 and the second aeration tank 11 includes the first aeration tank 10 and the second aeration tank 11. Working ports 33 and 33 each having a lid that can be opened and closed are provided on the upper wall side.
Accordingly, the aeration tank 2 that is horizontally long and can be lowered in height can easily perform maintenance work such as internal cleaning and inspection from each work port 33.
Further, when it is desired to configure the aeration tank 2 having the above size or a special installation type aeration tank 2, it can be manufactured by waterproof concrete or FRP, and the first aeration tank 10 and the second aeration tank 10 When manufacturing the aeration tank 11 by the structure which isolate | separated, both are connected by the pipe.

  In the aeration tank 2 configured as described above, the wood chips B are mixed in the first aeration tank 10 and the second aeration tank 11 at a predetermined ratio. In this embodiment, the mixing ratio of the wood chips B is preferably about 10% with respect to the volume of water. In this case, the aeration process is suitable because it has fluidity without impairing the stirring convection of the raw water and the wood chips. Can be done.

  First, raw water is supplied from the charging tank 5 through the connecting pipe 13 into the first aeration tank 10, and pressure-feed air is ejected from the air pipe 15 to start the water purification process. As a result, the raw water stored at the water level set by the delivery pipe 16 in the first aeration tank 10 is given an aeration action by the air that blows out from the lower part on one side (left side), and this upward flow causes Convection occurs in the direction of the arrow, and the wood chip B is circulated with stirring.

  At this time, in the first aeration tank 10 having a large capacity, a large amount of raw water is repeatedly agitated with the wood chip B and treated with sufficient processing time, thereby reducing the processing load in the second aeration tank 11. Can do. Further, when the raw water in the first aeration tank 10 exceeds a certain level due to the supply of the raw water supplied sequentially or intermittently, it overflows from the delivery pipe 16 via the lower vertical pipe section 31 and the first aeration. The intermediate treated water subjected to the primary treatment by the tank 10 is supplied into the aeration chamber 17 of the second aeration tank 11.

  The intermediate treated water supplied to the second aeration tank 11 is subjected to the aeration action by the air supplied from the air pipe 23 in the aeration chamber 17 while reaching the water level set by the delivery pipe 25. As a result, the intermediate treated water is circulated in the aeration chamber 17 together with the wood chips B by convection in the same manner as in the first aeration tank 10.

  The intermediate treated water descends along the partition wall 20 by convection in the direction of the arrow and is guided to the guide wall 21, and the direction of the intermediate treated water is reliably changed to the upstream (front) air pipe 23 side at a position higher than the bottom wall of the aeration chamber 17. In this way, a circulating flow can be formed. Then, the circulating flow formed can be temporarily deposited so as to form a mountain shape with the air pipe 23 by moving the contaminants and the like to be deposited on the bottom wall of the aeration chamber 17 to the front side. it can.

Accordingly, accumulation of contaminants in the inflow interval 22 and immediately before the inflow interval 22 is prevented, and the movement of discharge of untreated contaminants and the like accumulated in the bottom wall from the inflow interval 22 into the discharge chamber 19 is suppressed. In addition, the processing load in the discharge chamber 19 can be reduced.
Further, the foreign matter that has flowed into the discharge chamber 19 is guided to the suction flow of the return device 26 having the suction port 30 opened on the lower side of the inflow interval 22, sucked into the return tube 27, and subjected to aeration processing in the tube. While being returned to the first aeration tank 10.

Then, the intermediate treated water in the discharge chamber 19 in a state where the contaminants have been removed by the return device 26 is pushed up by the intermediate treated water entering from the inflow interval 22 and reaches the delivery pipe 25 side.
Further, the intermediate treated water can be placed in a stationary state without being affected by stirring, upward flow or the like caused by the air fed in the return pipe 27. Accordingly, in the discharge chamber 19 which is not disturbed by the installation of the return device 26 and becomes a static environment, the settling action of the intermediate treated water is promoted, and clean treated water with regulated mixing of floating substances is sent out from the upper delivery pipe 25. Can do.

  That is, in the discharge chamber 19, untreated contaminants and solids (organic matter) are quickly settled down to the bottom wall by suction of the return device 26, and the contaminant removal return to the first aeration tank 10 and the return pipe 27 are performed. The aeration process in the inside is repeated, and the decomposition process can be promoted in a state where the deposits and the suspended matter are reduced. If the suction port 30 is formed wide along the downstream side of the inflow interval 22 as shown by the dotted line in FIG. 3, the single return pipe 27 can correspond to the large second aeration tank 11 at low cost. be able to.

  Further, the aeration tank 2 does not require the installation of a separation device or the like for discarding suspended matter or deposits to the outside of the aeration tank 2, unlike the conventional one, and the reaction of the next process is performed from the delivery pipe 25 with a simple configuration. It is possible to enable direct water supply to the tank 4 or the like. Therefore, there is an advantage that a simple circulation system of the treatment facility can be configured.

  The aeration tank 2 configured as described above and capable of treating sludge water is connected to a plurality of tanks in series as shown in FIG. With each aeration tank 2 connected to the side, it is possible to take out the treated clean water from the aeration tank 2 at the final stage by sequentially repeating the treatment. In addition, as shown in the experiment example mentioned later, the process purified water taken out via the water supply pipe 37 was able to be made almost odorless without a strange smell, although raw water was fully purified and was a primary treatment level.

  Further, as shown in the illustrated example, for example, when four aeration tanks 2 are connected in series and treated water is supplied to the reaction tank 4, the first aeration tank 10 and the second aeration tank 11 are integrated into the aeration tank 2. If the aeration tanks 2 are preferably arranged in parallel and opposite directions, the upstream discharge chamber 19 can face the first aeration tank 10 on the downstream side, and the delivery pipe of the discharge chamber 19 is provided. Both can be connected by a short pipe line with 25 as a connecting pipe. A water feed pump 35 is installed in the discharge chamber 19 of the final stage aeration tank 2, and the treated purified water can be piped so as to be supplied to the reaction tank 4 via the switching valve 36 and the water feed pipes 37 and 37.

Further, the primary processing device 3 composed of the four aeration tanks 2 can be installed in a square shape as a whole in plan view, and is within the longitudinal direction (left and right length) of the uppermost aeration tank 2. If the water storage tank 6 and the charging tank 5 are housed in the storage space 1, the efficiency of the installation space of the processing facility 1 can be increased.
Furthermore, a passage 38 for running a work vehicle such as a yumbo can be formed on both sides of the primary processing apparatus 3 in a straight line having a wide width and good workability, and the reaction tank 4 is installed in parallel along the passage 38. can do.

  The primary processing apparatus 3 including the charging tank 5 and the reaction tank 4 can easily have the same length in the front-rear direction, and the entire processing facility 1 can be formed in a square shape in plan view. At this time, the front and rear length of the reaction tank 4 can be matched with the primary treatment apparatus 3 while ensuring the processing capacity by adjusting the left and right width of the reaction tank 4, and the effective use of land, the piping structure, and Construction work and the like can be simplified.

  Next, another embodiment of the aeration tank 2 will be described with reference to FIG. In addition, description is abbreviate | omitted about the structure and effect | action similar to the thing of the said embodiment. The aeration tank 2 has a partition wall 12 that divides the primary treatment device 3 and the second aeration tank 11 by opening the upper part at the water level, thereby forming a delivery port 16 in the tank width, and a delivery pipe comprising the pipe. Is omitted. The partition wall 12 has an upper side whose height is substantially the same as that of the delivery pipe 16 of the aeration tank 2, and a delivery side 14 that is bent in a curved shape toward the upstream side of the primary processing device 3. is doing.

  Thus, the first aeration tank 10 provided with the partition wall 12 regulates the upper limit water level of the raw water supplied and stored from the connection pipe 13 to the upper end height of the delivery side 14, and the treated raw water subjected to the aeration process exceeding the delivery side 14. Water can be supplied to the second aeration tank 11. Further, the level of the intermediate treated water supplied into the second aeration tank 11 is regulated at the position of the delivery pipe 25 installed at a position slightly lower than the delivery side 14 of the partition wall 12, and water is fed from the delivery pipe 25. Can do.

  At this time, the sending edge 14 can feed the raw water on the first aeration tank 10 side by regulating the inflow of floating substances on the upstream side by the tip portion bent toward the upstream side. At this time, the raw water convected in the direction of the arrow by the aeration action of the air pipe 15 is guided downward along the shape of the delivery side 14 to guide the suspended matter downward to be circulated.

The return pipe 27 is configured to pass through the upper side of the delivery side 14 and return the intermediate treated water in the second aeration tank 11 with the opening facing the middle part of the primary treatment device 3.
Further, the raw water supply and water level control of the treatment facility 1 can be arbitrarily controlled from the management facility by various automatic and manual operations of various pumps and switching valves.

  Next, the reaction tank 4 will be described with reference to FIGS. This reaction tank 4 has the vertical and horizontal lengths set to the above-mentioned levels, and the height (depth) is set to about 300 cm. In this case, about half of the height is excavated from the ground and buried. It is desirable to construct and fill the embankment 41 on the outside of the peripheral wall 40 protruding to the ground surface.

Further, the water tank 37 is connected to the reaction tank 4 on the upper side in the longitudinal direction (upper side in the processing direction), and the take-out tank 42 is installed at an appropriate position on the lower side in the processing direction.
The take-out tank 42 is partitioned and formed in a well shape so as to be deeper than the reaction tank 4, and is connected via a conduit 44 from the bottom 43 of the reaction tank 4 formed in a downward inclined shape. The take-out tank 42 is provided inside with a water absorption pipe 46 of the water absorption pump 45 close to the bottom, and a water supply pipe 47 of the water absorption pump 45 is connected to the water storage tank 6.

In the reaction tank 4 configured as described above, for example, when the depth is set to about 300 cm, the wood chip A serving as a microbial bed material has a chip treatment layer having a layer thickness of about 250 cm from the bottom 43 side. It is supplied to form and filled in a spread state.
The supply operation of the wood chips A to the reaction tank 4 can be performed easily by moving a jumbo (not shown) through the passage 38, and the wood chips A to be input are made to have a uniform density as a whole while being sequentially stepped and compacted. It is filled to become.

  In the reaction tank 4 filled with the wood chips A, treated purified water obtained by treating the intermediate treated water is supplied from the water supply pipe 37 and sprayed on the surface of the chip treatment layer as raw water for the reaction tank (treated water). it can. The water supply pipe 37 is provided with a water spray pipe 39 as shown by a dotted line, and uniform water spray can be performed on a wide surface.

  Thereby, the chip treatment layer can filter the raw water from the surface side and pass it through, and performs the water purification treatment with the wood chip A as the raw water reaches the lower side. As the water purification treatment is performed in this way, the chip treatment layer is formed by forming the aerobic anaerobic treatment layer 50 described later with a layer thickness of about 190 cm from the bottom 43 side by decomposition of the raw water and microbial action. The aerobic treatment layer 51 can be formed with a layer thickness of about 60 cm above the aerobic anaerobic treatment layer 50.

  Further, the raw water becomes purified water that has been subjected to water purification treatment from the aerobic treatment layer 51 through the aerobic anaerobic treatment layer 50 through an appropriate treatment time required for water purification treatment, and reaches the bottom 43. Then, the treated purified water is guided by the downward slope of the bottom 43 and flows into the take-out tank 42 from the pipeline 44 without stagnation.

  Next, the purified water collected in the take-out tank 42 is pumped up in time by the water absorption pump 45 through the water absorption pipe 46 and stored in the water storage tank 6. The purified water stored in the water storage tank 6 can be taken out and used effectively for any purpose, and a part of the purified water is supplied into the input tank 5 as dilution water for diluting the raw water on the aeration tank 2 side. It is recycled. The purified water can also be discharged from the reaction tank 4 as it is.

  Since the wood chip A filled in the reaction tank 4 uses the same wood chips as those shown in Patent Document 2 as a filter medium for the chip treatment layer, microorganisms and bacteria are each in accordance with the type thereof. It has a unique condition that adapts to the growth and reproduction of the fish, and adapts to changes in the ph value, nutrients, temperature, etc. in the environment accompanying the supply of raw water.

  In addition, the chip treatment layer made of wood chips A can form a large surface area as a raw water reaction treatment tank, and is excellent in moisture retention and heat retention and promotes biological treatment of organic sludge. Furthermore, since the chip processing layer maintains the original organic living tissue of wood for a long period of time even during long-term processing, maintenance work such as replacement or cleaning of filter media is difficult to cause clogging. Water-saving treatment can be performed stably and with high performance.

  And the reaction tank 4 filled with the wood chip A has an aerobic treatment layer 51 in which aerobic bacteria mainly reside in the upper chip treatment layer as the water purification process is performed, and the wood chip A as it reaches the lower layer. An aerobic anaerobic treatment layer 50 in which anaerobic bacteria increase in a state where aerobic bacteria and anaerobic coexist can be formed at a ratio of the layer thickness.

  As a result, the raw water supplied to the surface of the chip treatment layer is first subjected to aerobic treatment by aerobic bacteria living in the aerobic treatment layer 51 and then passed through the aerobic anaerobic treatment layer 50. An anaerobic bacterium is mixed and the anaerobic bacterium increases as it reaches the lower layer, and water purification treatment with the amphoteric bacterium is suitably performed to obtain purified water.

  Next, an experimental example in which the okara sludge water produced during the production of tofu is purified by the treatment facility 1 of the method shown in FIG. 1 will be described. In this example, the okara waste sludge water obtained by diluting the okara charged in the charging tank 5 with the purified water recovered from the reaction tank 4 was used as raw water. Moreover, the aeration tank 2 to be used has a liquid storage capacity of about 4 tons, and the wood chips B are mixed in the above ratio.

The primary processing apparatus 3 has a configuration in which three aeration tanks 2 are connected in series according to the above-described configuration, and the raw water in the charging tank 5 is supplied to the upstream aeration tank 2 to supply the most downstream aeration tank 2. Then, treated treated water was supplied to the reaction tank 4 through a water pipe 37. The reaction tank 4 had a height of about 300 cm as in the previous embodiment, and the chip processing layer was formed with the amount of wood chips A filled therein being about 60 m ³ .

  The experimental values are shown in Table 1. In the table, the sample weighed before the water purification treatment is the raw water in the charging tank 5, and the sample weighed after the treatment is the purified water collected in the water storage tank 6. The sample weighed after the aeration treatment is treated purified water taken out from the most downstream aeration tank 2 through the water supply pipe 37.

  The purified water obtained by the treatment as described above was confirmed to have a clear result that both the discharge standard value to the sewage and the river discharge standard value were significantly cleared. It was also confirmed that the measurement target value can be reduced at a low cost by the simple primary processing device 3 provided with the aeration tank 2 that does not require a special separation device for removing suspended matters or the like in advance. Moreover, it became clear that it is effective also for the treatment of Okara sludge water, which has been conventionally difficult to purify. Similarly, it can be applied to milk processing waste liquids and the like.

  Moreover, since the reaction tank 4 purifies the treated water pretreated by the aeration tank 2 through the chip treatment layer made of wood chips A and stores it in the water storage tank 6, the drainage of purified water, the production of liquid fertilizer or the use of wastewater for crop cultivation, etc. Can be made easier.

It is a top view which shows the structure of the processing apparatus concerning this invention. It is a sectional side view showing the composition of an aeration tank. FIG. 3 is a plan sectional view of FIG. 2. It is a sectional side view which shows the structure of another embodiment of an aeration tank. It is front sectional drawing which shows the structure of a reaction tank.

Explanation of symbols

1 processing equipment (processing facility)
2 Aeration tank 3 Primary treatment device 4 Reaction tank 5 Input tank 6 Water storage tank 10 First aeration tank 11 Second aeration tank 12 Partition wall 13 Supply port (connection pipe)
15, 23, 29 Air pipe 16, 25 Outlet (delivery pipe)
20 Bulkhead 21 Guide wall 22 Inlet (inflow interval)
26 Return device 27 Return tube 30 Suction port 31 Lower vertical tube portion 32 Upper vertical tube portion 37 Water supply pipes A and B Wood chips (woody fine pieces)

Claims (5)

  The first aeration tank (10) for aerating the stored raw water to flow out from the delivery port (16), and the intermediate treated water flowing in from the first aeration tank (10) is aerated and sent from the delivery port (25) to the outside. In the aeration tank (2) composed of the second aeration tank (11) to be discharged, the return is opened by bringing the suction port (30) close to the tank bottom wall on the delivery port (25) side of the second aeration tank (11). A structure in which a return pipe (27) of the device (26) is provided, and intermediate treated water in the second aeration tank (11) is returned from the suction port (30) to the first aeration tank (10) through the return pipe (27). Aeration tank structure.   An air pipe (15) and a return pipe (27) are provided upstream and downstream in the second aeration tank (11), and a partition wall (20) is provided between the air pipe (15) and the return pipe (27). In addition, the upstream aeration chamber (17) and the downstream discharge chamber (19) are partitioned and formed, and the guide wall (21) formed by bending the lower side of the partition wall (20) upstream and the tank bottom 2. The aeration tank structure according to claim 1, wherein an inflow interval (22) is formed between the wall and the aeration chamber (17) and the discharge chamber (19).   An air pipe (29) for ejecting air is provided in the suction port (30) of the return pipe (27), and an upward flow is generated in the return pipe (27) by the air, and the discharge chamber (19) on the bottom wall side The aeration tank structure according to claim 1 or 2, wherein the intermediate treated water is guided and returned to the first aeration tank (10).   The first aeration tank (10) and the second aeration tank (11) are partitioned by the partition wall (12) having the delivery port (16) in the aeration tank (2), and the first aeration tank (10) and the first aeration tank (10) The aeration tank structure according to claim 1, 2 or 3, wherein a work port (33) for maintenance work is provided in an upper part of the two aeration tanks (11).   A longitudinal pipe in which the delivery port (16) or the delivery port (25) is formed by a delivery pipe made of a horizontal pipe, and a lower longitudinal pipe part (31) and an upper longitudinal pipe part (32) are formed on the feeding side of the delivery pipe. The intermediate part is connected, and the opening part of a lower vertical pipe part (31) and an upper vertical pipe part (32) is each located in predetermined depth and height from a liquid level, Claim 1, 2 or 3 or 4 Aeration tank structure.

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