JP2005131536A - Circulation type flush toilet system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circulation type flush toilet system capable of stably keeping a total quantity of water. <P>SOLUTION: A control unit 11 detects the water level of a biological treatment tank 6 and the water level of an evaporation tank 8 by various float switches. In a case that the respective water levels of the biological treatment tank 6 and the evaporation tank 8 are each higher than a lower limit water level, a blower 25 is operated and the filtered water in the evaporation tank 8 is aerated to evaporate a part of filtered water. The total amount of water of the circulation type flush toilet system 1 can be properly adjusted by adjusting the evaporation amount of moisture in the evaporation tank 8. Accordingly, the overflow of sewage from the biological treatment tank 6 can be prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a circulating flush toilet system, and more particularly to a circulating flush toilet system that purifies sewage by microorganisms.

  According to the conventional circulating flush toilet system, the sewage flowing from the flush toilet is subjected to organic matter decomposition and nitrification / denitrification treatment in a biological treatment tank, solid-liquid separated in a filtration tank, and solid-liquid separated filtered water is removed. Decolorized in the decolorization tank, the filtered water decolorized is reused as washing water. In such a circulating flush toilet system, water can be effectively reused, so that the amount of tap water used can be significantly reduced. In addition, since sewage is not discharged, it can be used even in places where sewage treatment is not complete (for example, the top of a mountain), and there is no concern about environmental pollution.

However, in such a conventional circulating flush toilet system, sewage is circulated in the system without being discharged, so if the toilet is used frequently, the amount of human waste increases and the total amount of water in the system increases. To do. Further, when the total amount of water in the system further increased, sewage overflowed from each tank such as a biological treatment tank, and the operation of the system main body had to be stopped. Thus, for example, a flush toilet cleaning system having a function of atomizing excess purified water in the system by ultrasonic vibration to forcibly evaporate water has been proposed (see, for example, Patent Document 1). . In this purification system, the purified water purified by the filtering member is stored in a reservoir, and when the water level reaches a predetermined water level, only the amount of water exceeding the predetermined water level flows from the overflow port toward the evaporation tank. And the surplus water that has flowed into the evaporation tank is atomized by ultrasonic vibration, and the amount of water in the purification system is reduced.
Japanese Utility Model Publication No. 6-17889

  However, in the cleaning system for flush toilets described in Patent Document 1, when the water surface level of the reservoir becomes higher than the overflow port, the purified water overflows from here to the vaporizing means, and only the water level of the reservoir is excessive. Since water vaporization is controlled, it was difficult to stabilize the total amount of water. That is, when the toilet is used frequently, the purified water in the reservoir is frequently supplied to the cis tank by the circulation pump, so the water level of the reservoir is less likely to be higher than the overflow port, and excess water cannot be vaporized. . On the other hand, when the frequency of use of the toilet is low, the purified water is excessively vaporized.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a circulating flush toilet system capable of stably maintaining the total amount of water in the system.

  In order to achieve the above object, in the circulating flush toilet system according to claim 1, a biological treatment tank that receives sewage from a flush toilet, decomposes organic matter in the sewage, nitrifies and denitrifies, and the organism It has a filtration tank for solid-liquid separation of biologically treated water treated in the treatment tank, and a decolorization tank for decolorizing the filtered water solid-liquid separated in the filtration tank, and the treated water decolorized in the decolorization tank In the circulating flush toilet system that circulates to the flush toilet as washing water and returns the overflow water from the decoloring tank to the biological treatment tank, provided between the filtration tank and the decoloring tank, An evaporating tank communicated with the decoloring tank that receives and stores the filtered water separated and solid-liquid separated by the filtering tank and evaporates a part of the filtered water, and is provided in the evaporating tank. And a first water level detection means provided in the biological treatment tank for detecting the water level of the biological treatment tank, and a first water level detection means provided in the evaporation tank for detecting the water level of the evaporation tank. The water level of the biological treatment tank detected by the second water level detection means and the first water level detection means exceeds a preset lower limit water level, and is detected by the second water level detection means Evaporation control means for operating the evaporation means when the water level in the evaporation tank also exceeds a preset lower limit water level is provided.

  Further, in the circulating flush toilet system according to claim 2, in addition to the configuration of the invention according to claim 1, the water level of the biological treatment tank detected by the first water level detection means is preset. There is a warning means to prohibit the use of the toilet when the upper limit water level is exceeded.

  Furthermore, in the circulating flush toilet system according to claim 3, in addition to the configuration of the invention according to claim 1 or 2, the water level of the biological treatment tank detected by the first water level detection means is set to a lower limit water level. And a plurality of regions as the evaporating means, and the water level of the biological treatment tank detected by the first water level detecting means is close to the upper limit water level. Control is performed such that the number of the evaporation means to be operated is increased as the area is increased, and the number of the evaporation means to be operated is decreased as the area is closer to the lower limit water level.

  Moreover, in the circulation type flush toilet system of Claim 4, in addition to the structure of the invention in any one of Claims 1 thru | or 3, of the said biological treatment tank, the said filtration tank, the said evaporation tank, and the said decoloring tank Among them, water vapor that spontaneously evaporates from at least one tank is condensed, condensed, converted into water and returned to the biological treatment tank, and the biological treatment tank detected by the first water level detection means Condensation control means for operating the condensing means when the water level becomes lower than the lower limit water level.

  Further, in the circulating flush toilet system according to claim 5, in addition to the configuration of the invention according to any one of claims 1 to 4, the lower limit water level of the biological treatment tank is a period during which the amount of water is likely to increase (winter season) ) Is low, and it is characterized in that it is set higher during periods when the amount of water tends to decrease (summer).

  In the circulating flush toilet system according to claim 1 of the present invention, organic matter and ammonia in the sewage received from the flush toilet are subjected to organic matter decomposition and nitrification / denitrification treatment in the biological treatment tank, and the biological treatment water is supplied to the filtration tank. Sent out. Next, the biologically treated water is solid-liquid separated in a filtration tank. The filtered water subjected to solid-liquid separation is sent to a decoloring tank and ozone gas is blown into the decoloring tank to be decolorized, and used again as flush water in a flush toilet. Moreover, the overflow water from a decoloring tank is returned to a biological treatment tank. An evaporation tank communicating with the decolorization tank is provided between the filtration tank and the decolorization tank. The biological treatment tank is provided with first water level detection means for detecting the water level in the tank, and the evaporation tank is also provided with second water level detection means for detecting the water level in the tank. Furthermore, the evaporation tank is provided with an evaporation means for evaporating a part of the filtered water. The evaporation control means is configured such that the water level in the biological treatment tank detected by the first water level detection means exceeds a preset lower limit water level and the evaporation tank detected by the second water level detection means. The evaporation means is operated when the water level also exceeds a preset lower limit water level. Specifically, when the toilet is used frequently, the water level in the biological treatment tank becomes high, and the total amount of water in the system increases. Evaporate. Therefore, the total amount of water in the system can be reduced. Moreover, since an evaporation tank evaporates a water | moisture content in the whole tank, storing a large amount of filtered water, it can vaporize surplus water efficiently and can maintain the total amount of water in a system appropriately. Furthermore, since the evaporation means is not provided in the biological treatment tank but is provided in the evaporation tank, it does not affect the hydrogen ion concentration in the biological treatment tank. Therefore, the total amount of water in the system can be stably maintained without affecting the microbial activity. Furthermore, when the water level in the evaporation tank falls below the lower limit water level, the evaporation control means stops the operation of the evaporation means, so that it is possible to prevent shortage of treated water in the evaporation tank and the decolorization tank communicating with the evaporation tank. Can do.

  Further, in the circulating flush toilet system according to claim 2, in addition to the effect of the invention according to claim 1, when the water level of the biological treatment tank exceeds the upper limit water level, the alarm means causes the toilet to be used. Ban. Therefore, it can prevent that the water level of a biological treatment tank rises and sewage overflows from a biological treatment tank.

  In addition, in the circulating flush toilet system according to claim 3, in addition to the effect of the invention according to claim 1 or 2, the water level of the biological treatment tank is in a plurality of regions between the lower limit water level and the upper limit water level. The evaporation control means controls each of the plurality of evaporation means according to a region that is divided and includes a water level detected by the first water level detection means. Therefore, it is possible to quickly cope with large fluctuations in the water level of the biological treatment tank. Further, since each of the plurality of evaporation means is controlled, the evaporation amount in the evaporation tank can be finely adjusted. Further, the evaporation control means controls each of the plurality of evaporation means so that the number of the evaporation means to be operated increases in the region where the water level of the biological treatment tank detected by the first water level detection means is closer to the upper limit water level. Therefore, it is possible to quickly cope with large fluctuations in the water level of the biological treatment tank, and the higher the water level of the biological treatment tank, the greater the amount of evaporation in the evaporation tank. Further, the evaporation control means includes a plurality of evaporation means so that the area including the water level of the biological treatment tank detected by the first water level detection means is closer to the lower limit water level so that the number of evaporation means to be operated is reduced. To control each. Therefore, the lower the water level in the biological treatment tank, the lower the amount of water evaporated. Thus, since the water level of the biological treatment tank is controlled to be within the range between the upper limit water level and the lower limit water level, it is possible to prevent the sewage from overflowing from the biological treatment tank.

  In addition, in the circulating flush toilet system according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, the condensing means is configured such that the water level of the biological treatment tank is equal to or lower than the lower limit water level. In addition, water vapor that spontaneously evaporates from at least one of the biological treatment tank, filtration tank, evaporation tank, and decolorization tank is collected and condensed, thus preventing a shortage of total water in the circulating flush toilet system. be able to. The operation of the condensing means is controlled by the condensing control means, and the condensing means operates when the water level in the biological treatment tank detected by the first water level detecting means becomes equal to or lower than the lower limit water level. Therefore, only when the water level in the biological treatment tank falls below the lower limit water, the water vapor that spontaneously evaporates is collected, condensed by the condenser, and returned to the biological treatment tank, so the water level in the biological treatment tank rises again. Can be recovered.

  In addition, in the circulating flush toilet system according to claim 5, in addition to the effect of the invention according to any one of claims 1 to 4, in a period where the temperature is low and moisture is difficult to evaporate as in winter, By setting the lower limit water level of the biological treatment tank to be low, the operation time of the evaporation means can be lengthened and the evaporation amount can be adjusted to be large. Contrary to the winter season, when the temperature is high and moisture tends to evaporate like in the summer season, by setting the lower limit water level of the biological treatment tank higher, the operation time of the evaporation means can be shortened to evaporate. Since the amount of water evaporated by the means can be reduced, it is effective to stabilize the total amount of water in the system.

  Hereinafter, a first embodiment in which the present invention is applied to a circulating flush toilet system 1 will be described with reference to the drawings. FIG. 1 is a conceptual diagram of a circulating flush toilet system 1 according to the first embodiment of the present invention, and FIG. 2 is a configuration diagram of the circulating flush toilet system 1 according to the first embodiment of the present invention. is there. In addition, the circulating flush toilet system 1 of the first embodiment of the present invention can biologically process and decolorize the sewage discharged from the flush toilet 5 and use the treated water as wash water for the flush toilet 5 again. It is a non-draining toilet system.

  First, a schematic configuration of the circulating flush toilet system 1 will be described. As shown in FIG. 1 and FIG. 2, the circulating flush toilet system 1 receives a flush toilet 5 and sewage discharged from the flush toilet 5, and performs a biological treatment that decomposes organic matter by microorganisms and nitrifies and denitrifies ammonia. A tank 6, a filtration tank 7 for filtering the biologically treated water treated in the biological treatment tank 6, and an evaporation tank 8 for storing the filtered water filtered in the filtration tank 7 and evaporating a part of the filtered water. And a decoloring tank 9 that communicates with the evaporating tank 8 and decolorizes the filtered water with ozone (oxidation process), and a pump that supplies treated water decolorized by the decoloring tank 9 to the flush toilet 5 as washing water. 12.

  Further, as shown in FIGS. 1 and 2, the circulating flush toilet system 1 includes a blower 23 that supplies compressed air to the biological treatment tank 6, a blower 25 that supplies compressed air to the evaporation tank 8, and a filtration tank 7. A blower 24 for supplying compressed air is provided. The biological treatment tank 6 and the evaporation tank 8 are provided with a plurality of float switches for detecting the water level of each tank. In the biological treatment tank 6, an upper limit float switch 30, a lower limit float switch 33, and an evaporation tank 8 are provided. Inside, a lower limit float switch 41 is provided. Further, the filtration tank 7 is provided with a pH sensor 4 for detecting the pH (hydrogen ion concentration) of biologically treated water. And the control apparatus 11 which controls each operation | movement of each blower based on each water level of the biological treatment tank 6 and the evaporation tank 8, and the pH of the filtration tank 7 is provided. Further, a condenser 50 that condenses water vapor collected from the biological treatment tank 6, the filtration tank 7, the evaporation tank 8, and the decolorization tank 9 to generate condensed water, and supplies the condensed water to the biological treatment tank 6. Is provided. Furthermore, a warning lamp 45 is provided at the entrance of the toilet to notify the toilet user of the use prohibition.

  Next, the biological treatment tank 6 will be described. In this biological treatment tank 6, sewage from the flush toilet 5 flows in, and organic matter decomposition by microorganisms and nitrification / denitrification treatment are performed, respectively. As shown in FIG. 2, a box-shaped removal screen 3 whose upper surface is open is provided on the inner wall surface 6 a on the side of the biological treatment tank 6 where sewage flows. The removal screen 3 has a mesh shape and removes large impurities in the sewage. A submersible pump 14 is provided in the approximate center of the bottom surface of the biological treatment tank 6. This submersible pump 14 stirs the sludge in the biological treatment tank 6 by driving a motor to form a water flow. Further, a storage case 18 for storing a plurality of biodegradable plastic plates is suspended above the submersible pump 14 from the upper part of the biological treatment tank 6 by chains 21 and 21. Since the storage case 18 has a mesh shape, the flow of sludge formed by the submersible pump 14 can pass through the case. Note that ten biodegradable plastic plates are stored in the storage case 18 and are stored in parallel so as to stand perpendicular to the bottom surface in the storage case 18. Therefore, the sludge that passes through the storage case 18 passes through the storage case 18 while contacting the front and back surfaces of the biodegradable plastic plate. The role of the biodegradable plastic plate will be described later.

  Further, as shown in FIG. 2, air diffusers 23 a and 23 b are provided at the bottom of the biological treatment tank 6 so as to sandwich the submersible pump 14 at the center. The air diffuser 23 a is provided so as to be positioned below the removal screen 3. Furthermore, from below the removal screen 3, bubbles released from the air diffuser 23 a rise and pass through the mesh of the removal screen 3. Therefore, the mesh of the removal screen 3 is not easily clogged with impurities. The diffuser tubes 23 a and 23 b are connected to the blower 23, and the blower 23 is connected to the control device 11. This blower 23 produces | generates compressed air by control of the control apparatus 11, and supplies the compressed air to the diffuser tubes 23a and 23b, respectively. And many bubbles are discharge | released from the diffuser tubes 23a and 23b, and the sludge in the biological treatment tank 6 is aerated.

  In addition, an underwater pump 15 is provided at the bottom of the biological treatment tank 6 to pump up biological treatment water in the biological treatment tank 6 and supply it to the filtration tank 7. The submersible pump 15 is a general submersible pump of the same type as the submersible pump 14. Furthermore, in the tank of the biological treatment tank 6, an upper limit float switch 30 for detecting the upper limit water level and a lower limit float switch 33 for detecting the lower limit water level are provided at each water level point. These upper limit float switch 30 and lower limit float switch 33 are general float switches. These float switches include a sensor including a movable weight, a magnet, and a reed switch (not shown). And according to the water level of the biological treatment tank 6, ON / OFF of a reed switch is switched. The upper limit float switch 30 outputs an off signal to the control device 11 when the water level of the biological treatment tank 6 is equal to or lower than the upper limit water level, and an on signal when the water level exceeds the upper limit water level. On the other hand, the lower limit float switch 33 outputs an off signal to the control device 11 when the water level of the biological treatment tank 6 is equal to or lower than the lower limit water level, and an on signal when the water level exceeds the lower limit water level. Further, the upper limit float switch 30 and the lower limit float switch 33 are connected to the control device 11. Moreover, the control apparatus 11 judges the water level of the biological treatment tank 6 based on the ON / OFF signal which the upper limit float switch 30 and the lower limit float switch 33 output. And the biological treatment tank 6 which consists of the above structures stores the sludge in which microorganisms, such as nitrifying bacteria and a denitrifying bacteria, reside normally. The upper limit float switch 30 and the lower limit float switch 33 shown in FIGS. 1 and 2 correspond to “first water level detection means”.

  Next, the filtration tank 7 will be described. In the filtration tank 7, the biological treatment water supplied from the submersible pump 15 of the biological treatment tank 6 is filtered. As shown in FIG. 2, the solid-liquid separation of biologically treated water in the filtration tank 7 is performed by a filtration membrane 28 provided inside the filtration tank 7. Since the water level of the filtration tank 7 is set higher than the water level of the evaporation tank 8, a pressure difference due to the water head pressure between the filtration tank 7 and the evaporation tank 8 occurs, and the biologically treated water in the filtration tank 7 is filtered by the filtration membrane 28. The filtered water naturally flows into the evaporation tank 8.

  As shown in FIG. 2, the filtration tank 7 is provided with a pH sensor 4. The pH sensor 4 is connected to the control device 11. The pH sensor 4 detects the pH of biologically treated water, converts the detected pH value into a detection signal, and outputs the detection signal to the control device 11. Further, an air diffuser 24 a connected to the blower 24 is provided below the filtration membrane 28 and the pH sensor 4. Since the blower 24 is always operating, the compressed air supplied from the blower 24 is discharged from the diffuser tube 24a and rises as bubbles. And the sludge adhering to the filter membrane 28 and the electrode periphery of the pH sensor 4 is removed by the bubble discharge | released from the diffuser tube 24a. Therefore, clogging of the filtration membrane 28 due to sludge can be prevented, and further, poor sensitivity due to sludge adhesion of the pH sensor 4 can be prevented. In addition, the residual high-concentration sludge that is solid-liquid separated by the filtration membrane 28 and remains in the filtration tank 7 increases in water amount when the biologically treated water is supplied from the submersible pump 15 and overflows from the filtration tank 7. It is returned to the biological treatment tank 6 by a return sludge pipe not shown.

  Next, the evaporation tank 8 will be described. In the evaporating tank 8, the filtered water filtered by the filtering tank 7 is temporarily stored, a part of the filtered water is evaporated, and the total amount of water in the circulating flush toilet system 1 is adjusted. As shown in FIG. 2, the evaporating tank 8 is provided with a lower limit float switch 41 for detecting a lower limit water level in the tank at a lower limit water level point preset in the tank. Further, the lower limit float switch 41 is connected to the control device 11. And the control apparatus 11 judges the water level of the evaporation tank 8 based on the detection signal which the lower limit float switch 41 outputs. The lower limit float switch 41 uses the same type of float switch as the upper limit float switch 30 and the lower limit float switch 33. The lower limit float switch 41 outputs an off signal to the control device 11 when the water level of the evaporation tank 8 becomes equal to or lower than the lower limit water level, and an on signal when the water level exceeds the lower limit water level. The lower limit float switch 41 shown in FIG. 2 corresponds to “second water level detection means”.

  Further, as shown in FIG. 2, an air diffuser 25 a connected to the blower 25 is provided at the bottom of the evaporation tank 8. Then, the blower 25 generates compressed air and supplies the generated compressed air to the air diffuser 25a. Further, when bubbles are released from the air diffuser 25a, the filtered water in the evaporation tank 8 is aerated. Then, when the filtered water in the evaporation tank 8 is aerated, the water evaporates and the amount of water in the evaporation tank 8 decreases. And the operation | movement of the blower 25 is controlled by the control apparatus 11, and the evaporation amount of the water | moisture content in the evaporation tank 8 is adjusted.

  Next, the decolorization tank 9 communicating with the evaporation tank 8 will be described. In the decolorization tank 9, decolorization and sterilization treatment using ozone of the filtered water supplied from the filtration tank 7 is performed. As shown in FIG. 2, a communication port 47 through which each tank communicates is provided in the vicinity of the lower portion of the inner wall that partitions the evaporation tank 8 and the decolorization tank 9. The filtered water stored in the evaporation tank 8 naturally flows into the decolorization tank 9 through the communication port 47. Furthermore, a diffuser tube 20 a connected to the ozone generator 20 is provided at the bottom of the decolorization tank 9. And when the ozone generator 20 operates, the bubble of ozone is continuously discharge | released in water from the diffuser tube 20a. Furthermore, when the filtrate is oxidized with ozone, the chromaticity component in the filtrate is decomposed and the filtrate is decolorized. In addition, although the filtered water before ozone treatment is exhibiting pale yellow, substantially transparent treated water can be obtained by ozone treatment. In addition to the decomposition (decolorization) of the pigment component, the effect of the oxidation treatment with ozone has the effect of converting the hardly decomposable organic substance contained in the filtered water into an easily decomposable organic substance. Further, the nitrification treatment in the biological treatment tank 6 is not sufficient, and there is an effect that nitrous acid that has not been changed from ammonia to nitric acid is converted to nitric acid by applying oxygen from ozone.

  Then, as shown in FIG. 2, the treated water that has been subjected to ozone treatment in the decoloring tank 9 is pumped up by a pump 12 and supplied to the flush toilet 5 as washing water. In addition, when the frequency of use of the toilet is low, the flush toilet 5 does not use wash water, and the filtered water is continuously supplied from the filtration tank 7 to the evaporation tank 8, so the decoloring tank 9 is filled with treated water. Become. In this case, a part of the ozone treated water is returned to the biological treatment tank 6 again as an overflow water through a pipe not shown. Therefore, the easily degradable organic matter and nitric acid in the returned overflow water are decomposed in the biological treatment tank 6, and the nitric acid is denitrified by denitrifying bacteria.

  Next, the warning lamp 45 will be described. This warning lamp 45 is provided at a position that is easy for the user to understand (for example, near the entrance of the toilet). As shown in FIGS. 1 and 2, the warning lamp 45 is connected to the control device 11. The warning lamp 45 is lit based on a control signal output from the control device 11. Further, the control device 11 turns on the warning lamp 45 when the water level of the biological treatment tank 6 exceeds the upper limit water level. Then, the user is notified that the toilet is prohibited. Therefore, it is possible to prevent the sewage from overflowing from the biological treatment tank 6 in advance. The warning means for notifying the warning of the circulating flush toilet system 1 of the first embodiment is the warning lamp 45, but an audio buzzer or the like may be provided in addition to the warning lamp 45. Only a sound buzzer may be provided. The warning lamp 45 shown in FIGS. 1 and 2 corresponds to “alarm means”.

  Next, the control device 11 will be described. The control device 11 is connected to the blowers 23 and 25, the upper limit float switch 30, the lower limit float switch 33, the lower limit float switch 41, the pH sensor 4, and the condensing device 50. And the control apparatus 11 is performing the control of the blower 23 based on pH of biological treatment water, and the control of the blower 25 based on each water level of the biological treatment tank 6 and the evaporation tank 8, respectively. Moreover, the control apparatus 11 converts the water vapor | steam which evaporates from each tank into condensed water by controlling operation | movement of the condensing apparatus 50, and supplies it to the biological treatment tank 6. FIG. Although not shown, the control device 11 includes a CPU as a central processing unit, a ROM which is a read-only memory for storing various programs, a program being executed temporarily, various data, etc. And a RAM which is a readable and writable memory for storing. The control operation of the control device 11 will be described later. 2 corresponds to “evaporation control means” and “condensation control means”.

  Next, the condensing device 50 will be described. The condensing device 50 condenses the water vapor obtained by collecting from the biological treatment tank 6, the filtration tank 7, the evaporation tank 8, and the decoloring tank 9, and supplies condensed water obtained by condensation to the biological treatment tank 6. The biological treatment tank 6 is provided with an inflow pipe 54 into which water vapor in the biological treatment tank 6 flows, and the filtration tank 7 is provided with an inflow pipe 55 into which water vapor in the filtration tank 7 flows. Further, the evaporating tank 8 is provided with an inflow pipe 56 into which water vapor in the evaporating tank 8 flows, and the decolorizing tank 9 is provided with an inflow pipe 57 into which water vapor in the decolorizing tank 9 flows. Each downstream end of the inflow pipes 54, 55, 56 and 57 through which water vapor passes is connected to one inflow pipe 52, and the downstream end of the inflow pipe 52 is connected to the condenser 50. Has been. Therefore, the water vapor evaporating from each tank passes through the inflow pipes 54 to 57, joins in the inflow pipe 52, and further flows into the condensing device 50. In the condensing device 50, the water vapor that has flowed in is condensed and converted into condensed water, and the converted condensed water is supplied from the condensed water supply pipe 51 to the biological treatment tank 6. The condensing device 50 shown in FIGS. 1 and 2 corresponds to “condensing means”.

  As shown in FIGS. 1 and 2, the condensing device 50 is connected to the control device 11, and the operation of the condensing device 50 is controlled based on the control signal of the control device 11. Further, when the condensing device 50 does not operate, the water vapor flowing into the condensing device 50 is discharged to the outside from an exhaust port (not shown) provided in the condensing device 50. Furthermore, various forms of the water vapor condensing method of the condensing device 50 can be applied. For example, the water vapor may be condensed by applying pressure to the water vapor with a compressor. Moreover, you may make it cool and liquefy using the cooling device of CPU of a computer, the Peltier device currently utilized for the refrigerator etc. The control of the condensing device 50 of the control device 11 will be described later.

  Next, the microorganism treatment in the biological treatment tank 6 will be described. The microbial treatment in the biological treatment tank 6 includes nitrification treatment with nitrifying bacteria and denitrification treatment with denitrifying bacteria in addition to organic matter decomposition in wastewater. Specifically, ammonia in sewage flowing from the flush toilet 5 is converted to nitric acid by nitrifying bacteria. The nitric acid produced by nitrification is denitrified by denitrifying bacteria and released into the atmosphere. In particular, denitrifying bacteria are denitrified by using organic substances in wastewater as an assimilation source (energy source). Here, for example, when the frequency of use of the circulating flush toilet system 1 is low, the amount of sewage flowing into the biological treatment tank 6 decreases, so the organic matter concentration in the sewage may temporarily decrease. Thus, when the state where the organic substance density | concentration in sewage is low continues, denitrifying bacteria cannot perform sufficient denitrification processing. Therefore, when the organic matter concentration in the sewage is low, the denitrifying bacteria use the biodegradable plastic plate stored in the storage case 18 as an assimilation source. Accordingly, the organic matter concentration of the sewage in the biological treatment tank 6 is always ensured to a concentration necessary for at least denitrifying bacteria for the denitrifying treatment by introducing the biodegradable plastic plate. Further, since the biodegradable plastic plate is decomposed by microorganisms, the storage case 18 is lifted from the surface of the water, and the biodegradable plastic plate is periodically replenished. Note that ten biodegradable plastic plates of the first embodiment are stored in the storage case 18, but the number of biodegradable plastic plates is preferably determined in consideration of the organic matter concentration in the sewage. .

  Next, the relationship between microbial activity and pH will be described. As described above, the sewage in the biological treatment tank 6 shown in FIG. 2 contains aerobic nitrifying bacteria and anaerobic denitrifying bacteria. When the sewage in the biological treatment tank 6 is subjected to aerobic conditions, the activity of nitrifying bacteria becomes dominant, nitric acid produced by the nitrifying bacteria is accumulated in the sewage, and the pH is lowered. Further, when the sewage is subjected to anaerobic conditions, the activity of the denitrifying bacteria becomes dominant and the nitric acid accumulated in the sewage is denitrified, so that the pH rises contrary to the former. Moreover, the activity of these nitrifying bacteria and denitrifying bacteria greatly depends on pH. For example, the optimum pH at which the activity of nitrifying bacteria is highest is generally said to be 6.5 to 8.0, and the optimum pH for the activity of denitrifying bacteria is said to be 7.0 to 8.5. Therefore, if the pH is in the range of 7 to 8, the nitrification / denitrification treatment is performed stably. Therefore, the control device 11 controls the operation of the blower 23 of the biological treatment tank 6 based on the pH of the biological treatment water detected by the pH sensor 4 provided in the filtration tank 7. And the aeration amount of the biological treatment tank 6 is controlled, and it adjusts so that pH may become 7-8 vicinity. In addition, in the control apparatus 11 of 1st embodiment, the pH threshold value which operates the blower 23 is set to pH7.5, and pH in the biological treatment tank 6 is controlled.

  Next, control of the blower 23 by the control device 11 will be described with reference to FIG. First, the pH sensor 4 provided in the filtration tank 7 detects the pH of the biologically treated water pumped up from the biological treatment tank 6. Then, the pH sensor 4 outputs the detected pH value to the control device 11 as a detection signal. Further, the control device 11 determines whether or not the pH detection value based on the detection signal output from the pH sensor 4 exceeds 7.5. And when the pH of biological treatment water exceeds 7.5, since the pH in the biological treatment tank 6 is high, it is possible that the nitric acid density | concentration in wastewater is low and denitrification processing is advancing. Furthermore, it is considered that the activity of nitrifying bacteria that perform nitrification treatment is reduced. Therefore, the control device 11 transmits a control signal for turning on the operation to the blower 23. Then, the blower 23 starts operation, and the compressed air supplied from the blower 23 is discharged into the biological treatment tank 6 from the diffuser tubes 23a and 23b. Then, sewage will be in an aerobic condition, the activity of the nitrifying bacteria which are aerobic bacteria will become high, and the activity of the denitrifying bacteria which are anaerobic bacteria will be suppressed, and pH will fall.

  Moreover, when the pH of biological treatment water is 7.5 or less, since the pH in the biological treatment tank 6 is low, it is possible that the nitric acid concentration in waste water is high and the nitrification treatment is progressing. Furthermore, it is conceivable that the activity of the denitrifying bacteria that perform the denitrification treatment is reduced. Therefore, the control device 11 transmits a control signal for turning off the operation to the blower 23. Then, the blower 23 stops operating. And sewage will become anaerobic conditions, the activity of the denitrifying bacteria which are anaerobic bacteria will become high, and the activity of the nitrifying bacteria which are aerobic bacteria will be suppressed, and pH will rise. In this way, the control device 11 compares the detection result of the pH sensor 4 with the threshold value of the pH and controls the operation of the blower 23 to control the pH in the biological treatment tank 6, so that nitrifying bacteria and denitrifying bacteria can be controlled. Adjust activity.

  Next, adjustment of the water level of the biological treatment tank 6 which is a main part of the present invention will be described. In the circulating flush toilet system 1 of the first embodiment, the amount of sewage flowing from the flush toilet 5 to the biological treatment tank 6 increases when the toilet is used frequently. And if there is much inflow of sewage, the water level of the biological treatment tank 6 will rise, and the total amount of water in a system will increase in connection with it. Furthermore, when the water level of the biological treatment tank 6 rises, if left untreated, sewage overflows from the biological treatment tank, and the use of the toilet must be stopped. Then, the control apparatus 11 of the circulation flush toilet system 1 which is the 1st Embodiment of this invention detects each water level of the biological treatment tank 6 and the evaporating tank 8, and based on the detected water level, an evaporating tank 8 is controlled. Then, the filtered water in the evaporation tank 8 is aerated by the blower 25, and the amount of water vapor evaporated from the filtered water is adjusted, whereby the total amount of water in the system is adjusted appropriately.

  On the other hand, if the frequency of use of the toilet is low, or if the amount of water vapor evaporating from each tank is large, the total amount of water in the system will be small, especially if the water level in the biological treatment tank 6 has decreased, This leads to a decrease in microbial treatment capacity. In such a case, the control device 11 operates the condensing device 50. And the water vapor which evaporates from each tank is collect | recovered, and condensed water is produced | generated by condensing water vapor | steam in the condensing apparatus 50. FIG. Then, by supplying the condensed water to the biological treatment tank 6, it is possible to suppress a decrease in the amount of water.

  Next, control of the blower 25, the condensing device 50, and the warning lamp 45 in the control device 11 will be described with reference to FIGS. FIG. 3 is a table showing the operation of the blower 25, the condensing device 50 and the warning lamp 45 based on the water level regions of the biological treatment tank 6 and the evaporation tank 8, and FIG. 4 shows the blower 25, 4 is a flowchart illustrating control of a condenser device 50 and a warning lamp 45. As shown in FIG. 2, the biological treatment tank 6 is provided with an upper limit float switch 30 and a lower limit float switch 33. And as shown in FIG. 3, in the water level of the biological treatment tank 6, an upper limit water level and a lower limit water level are each set. Further, the region exceeding the upper limit water level is set as “region A”, the region exceeding the lower limit water level and below the upper limit water level is set as “region B”, and the region lower than the lower limit water level is set as “region C”. Further, as shown in FIG. 2, the lower limit float switch 41 is similarly provided in the evaporation tank 8. And as shown in FIG. 3, in the water level of the evaporation tank 8, a minimum water level is set. Further, an area exceeding the lower limit water level is set as “area a”, and an area below the lower limit water level is set as “area a”. And as shown in FIG. 3, when the control apparatus 11 judges whether the water level of the biological treatment tank 6 and the water level of the evaporating tank 8 correspond to the areas A to C, the areas A, and B, the blower 25, The operations of the condenser 50 and the warning lamp 45 are controlled.

  As shown in the flowchart of FIG. 4, specifically, in the biological treatment tank 6, on / off signals of the upper limit float switch 30 and the lower limit float switch 33 are respectively received. Then, based on the received on / off signal, it is determined whether the water level in the biological treatment tank 6 corresponds to any of “region A”, “region B”, and “region C” shown in FIG. 3 (S1). Further, the evaporating tank 8 receives ON / OFF signals of the lower limit float switch 41 (S2). Then, based on the received ON / OFF signal, it is determined whether the water level in the evaporation tank 8 corresponds to “region A” or “region A” shown in FIG.

  And it is judged whether the water level of the biological treatment tank 6 is in the area | region A (S3). If the water level of the biological treatment tank 6 is within the area A (S3: YES), the upper limit water level set in advance in the biological treatment tank 6 is exceeded. When the water level exceeds the upper limit water level, there is a risk that sludge overflows from the biological treatment tank 6, and it is determined that it is necessary to prohibit the use of the toilet. Therefore, an operation signal is transmitted to the warning lamp 45, and the warning lamp 45 that has received the operation signal is turned on (S7). When the warning lamp 45 is lit, the user is informed that the use of the toilet is prohibited. Therefore, since sewage does not flow into the biological treatment tank 6 from the flush toilet 5, it is possible to prevent the water level of the biological treatment tank 6 from rising further.

  Next, it is determined whether or not the water level in the evaporation tank 8 is within the area (S8). When the water level of the evaporating tank 8 is within the range A, it exceeds the preset lower limit water level of the evaporating tank 8. Therefore, since the water levels in the biological treatment tank 6 and the evaporation tank 8 are both high, it is determined that the total amount of water in the system needs to be reduced. And if the water level of the evaporation tank 8 is in area | region A (S8: YES), the blower 25 will be drive | operated and the condensing apparatus 50 will be stopped (S13). By the operation of the blower 25, a part of the filtrate water in the evaporation tank 8 evaporates. Therefore, the water level of the evaporating tank 8 is lowered, and the total amount of water in the entire system is reduced. Furthermore, the water level of the biological treatment tank 6 also decreases. Further, when the water level in the evaporation tank 8 is not within the area A (S8: NO), the water level is within the area A, so the water level in the evaporation tank 8 is equal to or lower than a preset lower limit water level. When the water level of the evaporating tank 8 is equal to or lower than the lower limit water level, it is determined that the total amount of water is decreasing. Therefore, the blower 25 and the condensing device 50 are stopped (S12).

  When the water level in the biological treatment tank 6 is not within the region A (S3: NO), the water level is equal to or lower than the upper limit water level, so a stop signal is transmitted to the warning lamp 45 and the warning lamp 45 is turned off ( S4). And it is judged whether the water level of the biological treatment tank 6 is in the area | region B (S5). If the water level is within the region B (S5: YES), the water level in the biological treatment tank 6 exceeds the preset lower limit water level. Further, in conjunction with the biological treatment tank 6, it is determined whether or not the water level of the evaporation tank 8 is in the area (S6). If the water level in the evaporating tank 8 is within the area (S6: YES), the water level in the evaporating tank 8 also exceeds the lower limit water level, so that the water level in the biological treatment tank 6 is not further increased. It is determined that the amount of water needs to be reduced, the blower 25 is operated, and the condensing device 50 is stopped (S11). Therefore, part of the filtered water in the evaporating tank 8 evaporates, so the total amount of water in the system decreases. If the water level in the evaporating tank 8 is not in the area A (S6: NO), the water level is in the area A, so both the blower 25 and the condenser 50 are stopped (S10).

  Further, when the water level in the biological treatment tank 6 is neither in the region A nor in the region B (S3: NO, S5: NO), the water level is in the region C. When the water level of the biological treatment tank 6 is in the region C, the use frequency of the toilet is low, the sewage hardly flows into the biological treatment tank 6, or the temperature is high in summer or the like, and the evaporation amount of water is large. Conceivable. In such a case, the blower 25 is stopped and the condensing device 50 is operated (S9). When the condensing device 50 is operated, the water vapor evaporating from each tank is condensed by the condensing device 50 and supplied to the biological treatment tank 6 as condensed water. Therefore, the total amount of water in the system is properly maintained.

  Thus, the blower 25 and the condensing device 50 operate | move based on each water level of the biological treatment tank 6 and the evaporating tank 8, and adjust the total water quantity in the circulation type flush toilet system 1 by aeration and condensation. The sewage or treated water stored in each tank in the circulating flush toilet system 1 has a time when moisture easily evaporates and a time when it is difficult to evaporate depending on the season. Therefore, the lower limit water level set in the biological treatment tank 6 is set higher when the water is likely to evaporate as in summer. Then, the operation of the blower 25 can prevent moisture from evaporating excessively. On the other hand, when it is difficult for water to evaporate as in winter, contrary to summer, the lower limit water level is set low so that the amount of evaporation increases. Further, the lower limit water level may be set not only for the lower limit water level of the biological treatment tank 6 but also for the lower limit water level of the evaporation tank 8 depending on the situation.

  As described above, according to the circulating flush toilet system 1 of the first embodiment, the control device 11 detects the water level of the biological treatment tank 6 and the water level of the evaporation tank 8 by each float switch. And when each water level of the biological treatment tank 6 and the evaporation tank 8 is high, the blower 25 is operated, the filtrate in the evaporation tank 8 is aerated, and a part of filtrate is evaporated. And by adjusting the evaporation amount of filtrate water, the water level of the biological treatment tank 6 can be adjusted appropriately, and the total amount of water in the circulating flush toilet system 1 can be adjusted appropriately. Furthermore, since it is possible to prevent the sewage from overflowing from the biological treatment tank 6, it is not necessary to stop the operation of the entire circulating flush toilet system 1.

  Moreover, when the use frequency of a toilet is low and the water level of the biological treatment tank 6 and the evaporating tank 8 is low, the condensing device 50 is operated. When the condensing device 50 is operated, the water vapor evaporating from each tank is condensed by the condensing device 50 and supplied to the biological treatment tank 6 as condensed water. And the total amount of water in the system is appropriately maintained. Furthermore, since the blower 25 is not provided in the biological treatment tank 6 but is provided in the evaporation tank 8, it does not affect the hydrogen ion concentration in the sewage in the biological treatment tank 6. Therefore, the water level of the biological treatment tank 6 can be adjusted without affecting the microbial activity. Thus, since the amount of water circulating in the circulating flush toilet system 1 is appropriately adjusted, the microbial treatment can be performed stably.

  Next, a circulating flush toilet system 100 according to a second embodiment of the present invention will be described. In the circulating flush toilet system 100 of the second embodiment, based on the water level of the biological treatment tank 6 and the water level of the evaporation tank 8, three evaporation means (blower 25, blower 26, heater 27) provided in the evaporation tank 8 are used. ) Are controlled individually. Moreover, in the water level of the biological treatment tank 6, in addition to the upper limit water level and the lower limit water level, a first water level and a second water level are set between them, and the water level region is further subdivided to thereby each water level. An appropriate amount of evaporation is adjusted according to the region.

  First, a schematic configuration of the circulating flush toilet system 100 according to the second embodiment will be described with reference to FIG. FIG. 5 is a configuration diagram of a circulating flush toilet system 100 according to the second embodiment of the present invention. As shown in FIG. 5, the configuration of the circulation flush toilet system 100 is substantially the same as the configuration of the circulation flush toilet system 1 of the first embodiment, and the biological treatment tank 6 and the evaporation tank 8 have different configurations. Prepare. In addition, in the following description, only a different structure from the circulation flush toilet system 1 of 1st Embodiment is demonstrated, and the same component shall be abbreviate | omitted. As shown in FIG. 5, the evaporation tank 8 of the circulating flush toilet system 100 according to the second embodiment includes an air diffuser 25 a connected to the blower 25, an air diffuser 26 a connected to the blower 26, and a heater 27. And are provided. The blower 25, the blower 26, and the heater 27 are connected to the control device 110. The heater 27 evaporates the filtered water by heating. The air diffuser 25a or the air diffuser 26a is a fixed air diffuser, but it may be moved according to the water level in the evaporation tank 8 and aerated near the water surface (upper aeration). Good.

  And although the float switch which detects the water level of the biological treatment tank 6 was two, the upper limit float switch 30 and the lower limit float switch 33 in 1st Embodiment, in the biological treatment tank 6 of 2nd Embodiment, A first float switch 31 and a second float switch 32 are provided between the upper limit float switch 30 and the lower limit float switch 33. The first float switch 31 is provided at a water level point on the upper limit water level side, and the second float switch 32 is provided at a water level point on the lower limit water level side. The first float switch 31 and the second float switch 32 are connected to the control device 110 in the same manner as the other float switches (the first float switch 31 and the second float switch 32). Thus, the control device 110 detects the water level in the biological treatment tank 6 based on the detection signals from the upper limit float switch 30, the first float switch 31, the second float switch 32, and the lower limit float switch 33.

  Next, control of the blower 25, the blower 26, the heater 27, the condenser device 50, and the warning lamp 45 in the control device 110 will be described with reference to FIGS. FIG. 6 is a table showing the operations of the blower 25, the blower 26, the heater 27, the condensing device 50, and the warning lamp 45 based on the water level regions of the biological treatment tank 6 and the evaporation tank 8, and FIG. 11 is a flowchart illustrating control of the blower 25, the blower 26, the heater 27, the condenser device 50, and the warning lamp 45. As shown in FIG. 6, in the water level of the biological treatment tank 6, an upper limit water level, a first water level, a second water level, and a lower limit water level are set. The region exceeding the upper limit water level is “region A”, the region exceeding the first water level and below the upper limit water level is “region B”, the region exceeding the second water level and below the first water level is “region C”, and the lower limit water level The region below the second water level is divided into five regions as “region D” and the region below the lower limit water level as “region E”. Further, as shown in FIG. 6, in the water level of the evaporation tank 8, similarly to the first embodiment, by setting the lower limit water level, the area exceeding the lower limit water level is “area A”, and the area below the lower limit water level. Is set as “area a”. The operations of the blower 25, the blower 26, the heater 27, the condensing device 50, and the warning lamp 45 are set in advance based on the water levels in the biological treatment tank 6 and the evaporation tank 8.

  Next, a specific operation of the control device 110 will be described with reference to FIGS. 6 and 7. First, in the biological treatment tank 6, ON / OFF signals of the upper limit float switch 30, the first float switch 31, the second float switch 32, and the lower limit float switch 33 are received (S21). Then, from the received on / off signal, the water level of the biological treatment tank 6 is any of “region A”, “region B”, “region C”, “region D”, and “region E” shown in FIG. Judge whether it falls under. Further, the evaporating tank 8 receives ON / OFF signals of the lower limit float switch 41 (S22). Then, based on the received on / off signal, it is determined whether the water level in the evaporation tank 8 corresponds to “region a” or “region a” shown in FIG.

  And it is judged whether the water level of the biological treatment tank 6 is the area | region A (S23). If the water level in the biological treatment tank 6 is within the region A (S23: YES), an operation signal is transmitted to the warning lamp 45 (S28). Next, the warning lamp 45 is turned on in response to the operation signal. When the warning lamp 45 is lit, the user is informed that the use of the toilet is prohibited. Therefore, since sewage does not flow into the biological treatment tank 6 from the flush toilet 5, it is possible to prevent the water level of the biological treatment tank 6 from rising further.

  Next, it is determined whether or not the water level in the evaporating tank 8 is in the area A (S32). If the water level in the evaporation tank 8 is within the area (S32: YES), the blower 25, the blower 26 and the heater 27 are operated and the condensing device 50 is stopped (S41). Since all of the blower 25, the blower 26, and the heater 27 are operated, the evaporation amount of the filtered water in the evaporation tank 8 can be increased. And the water level of the evaporation tank 8 falls and the total water quantity of the whole system reduces. Furthermore, the water level of the biological treatment tank 6 also decreases. If the water level in the evaporating tank 8 is not within the area A (S32: NO), the water level is within the area A, so the blower 25, blower 26, heater 27, and condenser 50 are stopped (S40).

  When the water level in the biological treatment tank 6 is not within the region A (S23: NO), the water level is equal to or lower than the upper limit water level, so a stop signal is transmitted to the warning lamp 45 and the warning lamp 45 is turned off ( S24). And it is judged whether the water level of the biological treatment tank 6 is in the area | region B (S25). If the water level is within the region B (S25: YES), the water level in the biological treatment tank 6 exceeds the preset lower limit water level. Further, it is determined whether the water level of the evaporation tank 8 is within the area A in addition to the biological treatment tank 6 (S31). If the water level in the evaporating tank 8 is within the area (S31: YES), the water level in the evaporating tank 8 also exceeds the lower limit water level, so it is determined that there is a need to reduce the amount of water in the system. 25, the blower 26 and the heater 27 are all operated, and the condensing device 50 is stopped (S39). Therefore, a part of the filtered water in the evaporating tank 8 evaporates in a large amount, so that the amount of water in the system decreases rapidly. If the water level in the evaporating tank 8 is not in the area A (S31: NO), the water level is in the area A. Therefore, the blower 25, the blower 26, the heater 27, and the condenser 50 are all stopped (S38).

  Moreover, when the water level of the biological treatment tank 6 is not in the area A and the area B (S23: NO, S25: NO), it is determined whether or not the water level is in the area C (S26). If the water level is within the region C (S26: YES), the water level of the biological treatment tank 6 is around the intermediate water level between the upper limit water level and the lower limit water level. Further, in conjunction with the biological treatment tank 6, it is determined whether or not the water level of the evaporation tank 8 is within the area (S30). If the water level in the evaporating tank 8 is within the area (S30: YES), the water level in the evaporating tank 8 also exceeds the lower limit water level, so it is determined that there is a need to reduce the amount of water in the system. 25 and the blower 26 are operated, and the heater 27 and the condenser device 50 are stopped (S37). Therefore, since the evaporation amount of the filtered water in the evaporation tank 8 is slightly reduced, the water amount in the system is slightly reduced. If the water level in the evaporating tank 8 is not in the area A (S30: NO), the water level is in the area A. Therefore, the blower 25, the blower 26, the heater 27, and the condenser 50 are all stopped (S36).

  Moreover, when the water level of the biological treatment tank 6 is not in the region A, the region B, and the region C (S23: NO, S25: NO, S26: NO), it is determined whether or not the water level is in the region D. (S27). If the water level is within the region D (S27: YES), the water level in the biological treatment tank 6 is slightly lower than the intermediate water level between the upper limit water level and the lower limit water level. Then, in conjunction with the biological treatment tank 6, it is determined whether or not the water level of the evaporation tank 8 is within the area (S29). If the water level in the evaporating tank 8 is within the area A (S29: YES), the water level in the evaporating tank 8 exceeds the lower limit water level, so it is determined that the amount of water in the system needs to be reduced slightly. Only the blower 25 is operated, and the blower 26, the heater 27, and the condensing device 50 are stopped (S35). Therefore, the evaporation amount of the filtered water in the evaporation tank 8 becomes a small amount, and the amount of water in the system decreases considerably gradually. If the water level in the evaporating tank 8 is not in the area A (S29: NO), since it is in the area A, the blower 25, the blower 26, the heater 27, and the condenser 50 are all stopped (S34).

  Moreover, when the water level of the biological treatment tank 6 is not in the region A, the region B, the region C, and the region D (S23: NO, S25: NO, S26: NO, S27: NO), the water level is in the region E. It is determined that there is (S27: NO). At this time, since the water level of the biological treatment tank 6 is equal to or lower than the lower limit water level, it is determined that the amount of water in the system is insufficient. Therefore, the aeration and heating in the evaporation tank 8 are stopped, and the water vapor evaporated from each tank is recovered and returned to the biological treatment tank 6. Therefore, the blower 25, the blower 26, and the heater 27 are all stopped, and only the condensing device 50 is operated (S33). Then, the evaporation amount of the filtered water in the evaporation tank 8 becomes a small amount. On the other hand, the water vapor evaporated from each tank is converted into condensed water by the condenser 50 and supplied to the biological treatment tank 6. Thus, the amount of water in the system does not decrease, and a decrease in the water level of the biological treatment tank 6 can be suppressed.

  As described above, according to the circulating flush toilet system 100 of the second embodiment, the three evaporation means (blowers) provided in the evaporation tank 8 are based on the water level of the biological treatment tank 6 and the water level of the evaporation tank 8. 25, blower 26 and heater 27) are controlled. And in the water level of the biological treatment tank 6, in addition to the upper limit water level and the lower limit water level, the first water level and the second water level are set, and the water level region is further divided into subdivided, thereby evaporating corresponding to each water level region. Adjust the amount each. Therefore, the evaporation amount can be finely adjusted with respect to the fluctuation of the water level in the biological treatment tank 6. Moreover, since the fluctuation | variation of the water level of the biological treatment tank 6 can be made small, the microbial treatment of sewage can be maintained stably.

  The present invention is not limited to the above embodiments, and various modifications can be made. For example, when the pH of the biological treatment tank 6 is low and the activity of denitrifying bacteria is low, or when the system is started up, a supply pump for supplying easily decomposable organic matter may be provided. These supply pumps may be controlled by a control device.

  The biological treatment tank 6 of the first and second embodiments is composed of one tank. For example, a biological treatment tank comprising two tanks is provided, and an aerobic tank (nitrification tank) and an anaerobic tank (degassing tank) are controlled by aeration control. Nitrogen tanks). Moreover, you may provide not only two tanks but the biological treatment tank which consists of several tanks. And you may make it provide a blower in each tank and control each operation | movement according to pH.

  Furthermore, a treated water tank or the like that temporarily stores treated water that has been subjected to ozone decolorization treatment may be provided between the decolorization tank 9 and the flush toilet 5 of the first and second embodiments.

  Further, the control devices 11 and 110 of the first and second embodiments control the pH in the biological treatment tank 6 by setting the pH threshold value for operating the blower 23 to pH 7.5. The threshold can be set freely. Also, a plurality of pH thresholds may be provided, and the plurality of blowers may be controlled by comparing the pH detected by the pH sensor with each threshold. Further, the blower may be controlled by setting an upper limit value (for example, pH 8) and a lower limit value (for example, pH 7) of pH, and comparing the detected pH value with each set value. .

  Furthermore, although the pH sensor 4 of the first and second embodiments is provided in the filtration tank 7, it may be provided in any of the filtration tank 7, the biological treatment tank 6, the evaporation tank 8, and the decolorization tank 9. Good. Further, the pH sensor 4 may be provided in all of the filtration tank 7, the biological treatment tank 6, the evaporation tank 8, and the decolorization tank 9. Furthermore, the pH sensor 4 may be provided in a pipeline through which sludge or treated water flows.

  The circulating flush toilet system of the present invention is not limited to toilets, and can be used for wastewater treatment such as domestic wastewater and industrial wastewater.

It is a conceptual diagram of the circulation type flush toilet system 1 which is the 1st Embodiment of this invention. It is a lineblock diagram of circulation flush toilet system 1 which is a 1st embodiment of the present invention. It is the table | surface shown about operation | movement of the blower 25, the condensing apparatus 50, and the warning lamp 45 based on each water level area | region of the biological treatment tank 6 and the evaporation tank 8. FIG. 4 is a flowchart illustrating control of the blower 25, the condenser device 50, and the warning lamp 45 of the control device 11. It is a block diagram of the circulating flush toilet system 100 which is the 2nd Embodiment of this invention. It is the table | surface shown about operation | movement of the blower 25, the blower 26, the heater 27, the condensing apparatus 50, and the warning lamp 45 based on each water level area | region of the biological treatment tank 6 and the evaporation tank 8. FIG. 4 is a flowchart illustrating control of the blower 25, the blower 26, the heater 27, the condenser device 50, and the warning lamp 45 of the control device 11.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circulating flush toilet system 5 Flush toilet 6 Biological treatment tank 7 Filtration tank 8 Evaporating tank 9 Decoloring tank 11 Control device 25 Blower 26 Blower 27 Heater 30 Upper limit float switch 33 Lower limit float switch 41 Lower limit float switch 45 Warning lamp 50 Condensing device 100 Circulating flush toilet system 110 controller

Claims (5)

A biological treatment tank that receives sewage from a flush toilet, decomposes organic matter in the sewage and nitrifies and denitrifies, a filtration tank that separates biologically treated water treated in the biological treatment tank, and the filtration tank A decolorization tank for decolorizing the filtered water separated in solid and liquid, and circulating the treated water decolored in the decolorization tank as wash water to the flush toilet, and overflowing water from the decoloration tank to the organism In a circulating flush toilet system that is returned to the treatment tank,
An evaporation tank that is provided between the filtration tank and the decolorization tank, receives and stores the filtered water solid-liquid separated by the filtration tank and evaporates a part of the filtrate, and communicates with the decolorization tank;
An evaporation means provided in the evaporation tank for evaporating a part of the filtered water;
A first water level detection means provided in the biological treatment tank for detecting the water level of the biological treatment tank;
A second water level detection means provided in the evaporation tank for detecting the water level of the evaporation tank;
The water level of the biological treatment tank detected by the first water level detection means exceeds a preset lower limit water level, and the water level of the evaporation tank detected by the second water level detection means is also preset. And an evaporation control means for operating the evaporation means when the lower limit water level is exceeded.   2. An alarm means for prohibiting the use of a toilet when the water level of the biological treatment tank detected by the first water level detection means exceeds a preset upper limit water level. The circulating flush toilet system described in 1. Dividing the water level of the biological treatment tank detected by the first water level detection means into a plurality of regions between a lower limit water level and an upper limit water level;
On the other hand, a plurality of evaporation means are set,
The number of the evaporating means to be operated is increased in the region where the water level of the biological treatment tank detected by the first water level detecting unit is closer to the upper limit water level, and the number of the evaporating units to be operated is closer to the region close to the lower limit water level. It controls so that it may decrease, The circulation type flush toilet system of Claim 1 or 2 characterized by the above-mentioned. Condensing means for collecting and condensing water vapor that spontaneously evaporates from at least one of the biological treatment tank, the filtration tank, the evaporation tank, and the decolorization tank, converting the water vapor into water, and returning it to the biological treatment tank; ,
A condensation control means for operating the condensation means when the water level of the biological treatment tank detected by the first water level detection means falls below a lower limit water level. The circulating flush toilet system according to any one of the above.   5. The lower limit water level of the biological treatment tank is set to be lower during a period in which the amount of water tends to increase (winter season) and higher during a period in which the amount of water tends to decrease (summer season). Circulating flush toilet system.

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