JP5084866B2 - Organic wastewater treatment equipment - Google Patents

Description

  The present invention relates to a processing apparatus for processing organic wastewater such as boiled udon soup and rice tofu.

Sewerage and drainage facilities are being developed to ensure environmental water quality standards. In the Water Pollution Control Law, etc., specific business establishments subject to industrial / business establishment drainage regulations are specified by the amount of wastewater (at least 50 m ³ / day) at the establishments, and drainage regulations are in effect. However, recently, water pollution due to the drainage of small-scale establishments not subject to the above regulations has become a problem.

For example, in Kagawa Prefecture, there is a problem that the water quality of rivers deteriorates due to wastewater containing udon boiled juice from udon shops. Therefore, in Kagawa Prefecture, the ordinance on the preservation of the living environment was revised in 2009 so that small-scale establishments such as udon shops and noodle manufacturers (drainage volume of 10 m ³ / day or more) are subject to drainage regulations. .

  Udon store wastewater contains a lot of starch, so it has high TOC (total organic carbon), BOD (biochemical oxygen demand) and COD (chemical oxygen demand), high load, and boiled high temperature It is characterized by a high drainage temperature because it contains soup. Accordingly, there is a need for a wastewater treatment device that is adapted to the characteristics of such wastewater.

  Therefore, the applicant of the present application has proposed an organic wastewater treatment apparatus for treating wastewater containing starch, for example, wastewater generated during the production of noodles or organic wastewater mainly composed of rice broth (patent application). 2009-3815, filed January 9, 2009). This treatment device mainly consists of an aerobic treatment tank and a biological filtration tank. These aerobic treatment tanks and biological filtration tanks are provided with a diffuser to improve the organic matter resolution in both tanks, and aerobic. It is formed so that treated water circulates between the treatment tank and the biological filtration tank.

  Patent Document 1 describes a bioreactor obtained by fixing a specific type of raw starch-degrading yeast or bacteria on a carrier and a wastewater treatment system comprising the bioreactor.

JP 2000-107793 A

  In the organic wastewater treatment apparatus described in Japanese Patent Application No. 2009-3815, the wastewater is aerated in the aerobic treatment tank and the biological filtration tank, but the organic matter is gradually decomposed by circulating these wastewater. To be processed. Therefore, if a large amount of wastewater with extremely high load is introduced into the treatment tank, the decomposition of the organic matter cannot catch up and the organic acid that is an intermediate decomposition product of starch is generated, and the pH of the treated water is lowered. Or the TOC concentration may be higher than the COD concentration.

  The bioreactor described in Patent Document 1 is intended for purification using the raw starch resolving power of a specific species of yeast or bacteria. Therefore, the wastewater treatment capacity is easily changed by being affected by the state of yeast or bacteria that are fixed. Therefore, until other non-useful bacteria are preferentially fixed to the carrier as the treatment time elapses and the raw starch resolution is reduced, or when the state of the specific yeast or the like fixed to the carrier deteriorates, it is re-fixed. It takes a long time and wastewater treatment may be delayed for a long time.

  The present invention has been devised in view of the above points, and its purpose is organic wastewater that can stably perform efficient wastewater treatment even when high-load wastewater containing a large amount of starch or the like flows in. It is in providing a processing apparatus.

  In order to solve the above problems, an organic wastewater treatment apparatus of the present invention performs a first treatment means for performing an aerobic treatment of organic wastewater, and a filtration treatment of treated water that has been aerobically treated by the first treatment means. At least a second treatment means and a third treatment means for performing further aerobic treatment of the treated water aerobically treated by the first treatment means, and the treated water filtered by the second treatment means. At least a part is configured to be returned to the first processing means, and at least a part of the treated water further aerobically treated by the third processing means is configured to be returned to the first processing means.

  In the first treatment means, an aerobic treatment of the organic waste water to be treated is performed. At least a portion of the treated water that has been aerobically treated in the first treatment means and further aerobic treated in the third treatment means returns to the first treatment means, and as a result, the first treatment means The concentration of TOC, BOD or COD etc. of the existing treated water is reduced. As a result, it is possible to lengthen the time for the purification treatment of organic wastewater, reduce the load of organic substances such as TOC per unit volume in each treatment means, and perform aerobic treatment efficiently, and sufficiently drain organic wastewater. Can be purified.

  Further, at least part of the treated water that has been filtered in the second treatment means returns to the first treatment means so that the treated water circulates between the first treatment means and the second treatment means. It is configured. Therefore, suspended solids (SS) contained in the water are adsorbed and removed by the filter medium provided in the second treatment means, so that treated water with low turbidity can be obtained, and aerobic treatment of organic wastewater can be performed. You can take a long time.

  The microorganism fixing carrier is disposed in the first processing means and the third processing means, and the treated water of the first processing means and the third processing means is drawn from a discharge section provided at the lower part of each processing means. It is preferable to be configured to be removed and transferred.

  Microorganisms are supported on the microorganism fixing carrier disposed in the first processing means and the third processing means in which aerobic processing is performed, and the outflow of microorganisms that perform aerobic processing is prevented. In addition, the treated water from the first treatment means and the third treatment means is withdrawn and transferred from a discharge section provided at the lower part of each treatment means. At this time, excess sludge generated in each treatment means is also removed. It is withdrawn along with the transfer of treated water. Therefore, in the maintenance of the apparatus, it is not necessary to discharge excess sludge from each processing means, and maintenance can be facilitated.

  It is also preferable to include pretreatment means for performing enzymatic decomposition treatment of starch contained in the organic waste water supplied to the first treatment means.

  In the pretreatment means, the enzymatic decomposition treatment of starch contained in the organic waste water is performed. By this enzymatic decomposition treatment, starch (carbohydrate) contained in the organic waste water is converted into saccharides or the like having a molecular weight smaller than that of starch, and organic substances are efficiently decomposed in the subsequent aerobic treatment in the first treatment means.

  Furthermore, the organic wastewater treatment apparatus of the present invention is transferred from a first aerobic treatment tank connected to the first aerobic treatment tank and a first aerobic treatment tank that performs aerobic treatment of organic wastewater. A second aerobic treatment tank for performing further aerobic treatment of the aerobic treated water, and a further aerobic treatment transferred from the second aerobic treatment tank connected to the second aerobic treatment tank A filtration treatment tank for performing a filtration treatment of treated water, and a third aerobic treatment for treated water that is connected to the second aerobic treatment tank and transferred from the second aerobic treatment tank. An aerobic treatment tank, configured to return at least a portion of the treated water filtered by the filtration treatment tank to the second aerobic treatment tank, and treated water aerobically treated by the third aerobic treatment tank So that at least a part of the water is returned to the first aerobic treatment tank. It is, and is configured to discharge a portion of the aerobic treated treated water to the outside by the Miyoshi aerobic treatment tank.

  Organic wastewater to be treated flows into the first aerobic treatment tank and aerobic treatment is performed. At least one treated water that has been aerobically treated in the first aerobic treatment tank, further aerobic treated in the second aerobic treatment tank, and additionally subjected to aerobic treatment in the third aerobic treatment tank. The part returns to the first aerobic treatment tank, and as a result, the concentration of TOC, BOD, COD, etc. of the treated water present in the first aerobic treatment tank is reduced. Therefore, the aerobic treatment time of the organic waste water can be taken long, and the load of organic substances such as TOC per unit volume in each aerobic treatment tank can be reduced to perform the aerobic treatment efficiently. Organic wastewater can be purified.

  In addition, at least a part of the treated water that has been filtered in the filtration tank is returned to the second aerobic tank, and a second aerobic tank in which aerobic treatment is performed and a filtration tank in which filtration is performed. It is comprised so that treated water may circulate between. Therefore, suspended substances (SS) contained in the water are adsorbed and removed by the filter medium in the filtration tank, so that treated water with low turbidity can be obtained and the time for aerobic treatment of organic waste water is increased. be able to.

  The first aerobic treatment tank, the second aerobic treatment tank and the third aerobic treatment tank are provided with a microorganism fixing carrier, and the first aerobic treatment tank, the second aerobic treatment tank and the third aerobic treatment tank It is preferable that the treated water transferred from the tank is configured to be extracted and transferred from a discharge portion provided at the lower part of each tank.

  Microorganisms are supported on the microorganism fixing carrier disposed in the first aerobic treatment tank, the second aerobic treatment tank, and the third aerobic treatment tank in which the aerobic treatment is performed, thereby preventing the microorganisms that perform the aerobic treatment from flowing out. In addition, the treated water from these aerobic treatment tanks is extracted and transferred from the discharge section provided at the lower part of each tank. At this time, surplus sludge generated in each tank is also extracted with the transfer of the treated water. . Therefore, in the maintenance management of the apparatus, it is not necessary to discharge excess sludge in each tank, and maintenance can be facilitated.

  It is also preferable to provide a pretreatment tank that is connected to the first aerobic treatment tank and that performs enzymatic decomposition of starch contained in the organic waste water.

  In the pretreatment tank, enzymatic decomposition of starch contained in the organic waste water is performed. By this enzymatic decomposition treatment, starch (carbohydrate) contained in the organic waste water is converted into saccharides or the like having a molecular weight smaller than that of starch, and the organic matter is efficiently decomposed by the subsequent aerobic treatment in the first aerobic treatment tank.

ADVANTAGE OF THE INVENTION According to this invention, the processing apparatus of the organic waste water which has the following outstanding effects can be provided.
(1) By returning the treated water from the third treatment means to the first treatment means, the concentration of total TOC (organic carbon) and the like in the first treatment means is lowered, and the unit volume in each treatment means The aerobic treatment can be efficiently performed by reducing the organic load, and the organic waste water can be sufficiently purified by taking a long time for the aerobic treatment.
(2) When treated water circulates between the first treatment means and the second treatment means, suspended matter (SS) contained in the water is applied to the filter medium provided in the second treatment means. By being removed by adsorption, treated water with low turbidity is obtained.
(3) Since microorganisms are carried on the microorganism fixing carrier, microorganisms that perform aerobic treatment are maintained in the tank, and excess sludge generated in the first treatment means and the third treatment means is treated water. Since it is pulled out together with the transfer, it is not necessary to pull out and clean the excess sludge generated in each processing means, and the maintenance of the apparatus can be facilitated.
(4) Since the starch contained in the organic waste water is converted into sugars in the pretreatment means for performing the enzymatic decomposition treatment of starch, the organic matter is efficiently decomposed in the later aerobic treatment.
(5) By returning the treated water from the third aerobic treatment tank to the first aerobic treatment tank, the concentration of all TOC (organic carbon) etc. in the first aerobic treatment tank is lowered, and each aerobic The aerobic treatment can be efficiently performed by reducing the organic substance load per unit volume in the treatment tank, and the organic waste water can be sufficiently purified by taking a long aerobic treatment time.
(6) When treated water circulates between the second aerobic treatment tank and the filtration treatment tank, suspended solids (SS) contained in the water are adsorbed and removed by the filter medium in the filtration treatment tank, and turbidity Low treated water.
(7) Since microorganisms are supported on the microorganism fixing carrier, microorganisms that perform aerobic treatment are maintained in the tank, and the first aerobic treatment tank, the second aerobic treatment tank, and the third aerobic treatment tank. Since the excess sludge generated in the above step is extracted along with the transfer of the treated water, it is not necessary to extract and clean the excess sludge generated in each aerobic treatment tank, thereby facilitating maintenance and management of the apparatus.
(8) Since starch contained in organic wastewater is converted into sugars in a pretreatment tank in which starch is enzymatically decomposed, organic substances are efficiently decomposed in the subsequent aerobic treatment.

1 is a block diagram schematically showing an overall configuration of an organic wastewater treatment apparatus according to a first embodiment of the present invention. It is a block diagram which shows the whole structure of the processing apparatus of the organic waste_water | drain in embodiment of FIG. 1 in detail. It is explanatory drawing concerning the enzyme decomposition process in the 1st aerobic processing tank in embodiment of FIG. It is explanatory drawing concerning the aerobic process in the 1st aerobic process tank in embodiment of FIG. It is explanatory drawing concerning the aerobic process in the 2nd aerobic process tank in embodiment of FIG. It is explanatory drawing which shows the circulation of the treated water between the 2nd aerobic processing tank and the filtration processing tank in embodiment of FIG. It is explanatory drawing concerning the aerobic process in the 3rd aerobic process tank in embodiment of FIG. It is a block diagram which shows roughly the whole structure of the processing apparatus of the organic waste_water | drain which concerns on 2nd embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the organic waste water treatment apparatus 1 according to the first embodiment of the present invention includes a first aerobic treatment tank 2 that performs an aerobic treatment on the inflowing organic waste water W ₀ . Further, the processing apparatus 1 is aerobic treatment in the first aerobic treatment tank 2, a second aerobic treatment tank 3 for further aerobic treatment of treated water W ₁ discharged from a lower portion thereof, the second and a filtration tank 4 for filtration treatment of treated water W ₂ discharged from the lower part of the aerobic treatment tank 3. As will be described later, the filtration tank in this embodiment includes two tanks, a filtration tank 4a and a filtration tank 4b (FIG. 2). The treated water W ₃ from the filtration treatment tank 4 returns to the second aerobic treatment tank 3 and is circulated between the second aerobic treatment tank 3 and the filtration treatment tank 4. Furthermore, the processing apparatus 1 includes a third aerobic treatment tank 5 that performs aerobic treatment of the treated water W ₂ that has been further aerobically treated in the second aerobic treatment tank 3. At least a part of the treated water W ₄ that has been aerobically treated in the third aerobic treatment tank 5 and discharged from the lower part thereof is configured to return to the first aerobic treatment tank 2. The treated water W _{5 that} has been purified by the aerobic treatment in the third aerobic treatment tank 5 and overflowed from the upper part of the third aerobic treatment tank ₅ is discharged to the outside.

The organic wastewater W ₀ to be treated, which is the treatment target of the treatment apparatus 1, is not particularly limited, and is a high-load wastewater, for example, boiled soup of noodles such as noodles containing starch, rice soup Or the waste water which generate | occur | produces at the time of manufacture of other foodstuffs is mentioned.

Next, the overall configuration of the processing apparatus 1 in the present embodiment will be described in more detail with reference to FIG. In the first aerobic treatment tank 2 provided in the treatment apparatus 1 in the present embodiment, an aeration device 20 for performing an aerobic treatment, a temperature sensor 21 for measuring the water temperature in the tank, and a microorganism fixing carrier 22 are provided. Is provided. The air diffuser 20 is connected to the blower 8 through a blower pipe 81. Moreover, the first aerobic treatment tank 2, the treated water W ₁ organic waste water to be treated and a discharge unit 23 for discharging the and the inlet 24 is provided entering. The discharge portion 23 provided in the lower portion of the first aerobic treatment tank 2 is connected to the flow path L _6, inlet 24 provided in an upper portion of the first aerobic treatment tank 2 flow path L ₃ It is connected to the. The flow path L _3, the electromagnetic valve, the flow path L ₂ and the pump P ₁ and the flow path L ₁ in which the organic waste water W ₀ flows through the treated water W ₄ from the Miyoshi anaerobic treatment tank 5 flows solenoid valve in the flow path _{L 4,} the flow path _{L 2,} the pump _{P 1,} is connected via a flow path _{L 5} and the solenoid valve. The flow path described above and below is only required to be able to transfer the organic waste water W ₀ and the treated waters W _{1 to} W _5, and includes, for example, a pipe or a hose.

  As shown in FIG. 2, the treatment apparatus 1 of the present embodiment is provided with an enzyme addition apparatus 7 that can add an enzyme solution 71 that decomposes organic matter to the first aerobic treatment tank 2. The enzyme addition device 7 includes a chemical solution tank 70 containing an enzyme solution 71, a pipe 72 for transferring the enzyme solution 71 from the chemical solution tank 70 to the first aerobic treatment tank 2, and a pump 73 installed in the pipe 72. Consists mainly of. The enzyme used here is mainly amylase, which is a starch-degrading enzyme, but it is appropriately selected according to the components contained in the organic wastewater, and a protease that is a proteolytic enzyme, a lipase that is an oil-degrading enzyme, etc. it can.

The 2nd aerobic processing tank 3 with which the processing apparatus 1 shown in FIG. 2 was equipped is demonstrated. The second aerobic treatment tank 3 is provided with an aeration device 30 for performing an aerobic treatment, a temperature sensor 31 for measuring the water temperature in the tank, and a microorganism fixing carrier 32. The air diffuser 30 is connected to the blower 8 through a blower pipe 82. Moreover, the second aerobic treatment tank 3, the discharge unit 33 and 34 for discharging the treated water W ₂ is provided, the treated water from the treated water W ₁ and filtration treatment tank 4b from the first aerobic treatment tank 2 An inflow part 35 into which W _3b flows and an inflow part 36 into which treated water W _3a from the filtration tank 4a flows are provided. The discharge portion 33 provided in the lower portion of the second aerobic treatment tank 3 is connected to the flow path L _9, the discharge unit 34 is connected to the flow channel L _12. Moreover, the inflow portion 35 provided on the upper portion of the second aerobic treatment tank 3 is connected to the flow path L _8, the flow path L _8, treated water W ₁ from the first aerobic treatment tank 2 The flow path L ₆ is connected to the flow path L ₆ via a solenoid valve, the flow path L ₇ , the pump P ₂ and the solenoid valve, and is also connected to the flow path L ₁₁ where the treated water W ₃ b from the filtration treatment tank 4 _b returns. Yes. Further inlet 36 is connected via a solenoid valve in the flow path L ₁₅ of treated water W _3a from filtration tank 4a is returned.

Next, the filtration tanks 4a and 4b provided in the processing apparatus 1 in the present embodiment shown in FIG. 2 will be described. In the present embodiment, two filtration treatment tanks are provided, but the number of filtration treatment tanks is not particularly limited, and is selected according to the ability of the filtration treatment depending on the type of the filter medium. The filtration tank 4a is provided with a filter medium 40a for performing a filtration process. The filter medium 40a is not particularly limited, but may be any filter material having irregularities on the surface and capable of adsorbing substances, and specific examples include charcoal and activated carbon. Further, the filtration treatment tank 4a is provided with a discharge part 41a for discharging the treated water W _3a and an inflow part 42a for receiving the treated water W ₂ from the second aerobic treatment tank 3. Then, the discharge portion 41a provided at the lower portion of the filtration tank 4a is connected to the flow channel L _15. Further, inlet 42a provided in the upper portion of the filtration tank 4a is connected to the flow channel L _14, the flow path L ₁₄ is a flow of treated water W ₂ from the second aerobic treatment tank 3 flows solenoid valve road _{L 12,} the flow path _{L 13,} solenoid valve, the flow path _{L 2,} are connected via a pump _{P 1} and the solenoid valve.

On the other hand, the filtration tank 4b is also provided with the filtering material 40b, like the filtration tank 4a, and the discharge water 41b for discharging the treated water W _3b and the treated water W ₂ from the second aerobic tank 3 flow in. An inflow portion 42b is provided. The discharge portion 41b provided at the lower portion of the filtration tank 4b is connected to the flow channel L _11. Also, inlet 42b provided on the upper portion of the filtration treatment tank 4b is connected to the flow path L _10, the flow path L ₁₀ is a flow of treated water W ₂ from the second aerobic treatment tank 3 flows solenoid valve road L _9, the flow path L _7, and is connected via a pump P ₂ and the solenoid valve.

Finally, the 3rd aerobic processing tank 5 with which the processing apparatus 1 of this embodiment shown in FIG. 2 was equipped is demonstrated. The third aerobic treatment tank 5 is provided with an aeration device 50 and a microorganism fixing carrier 51 for performing an aerobic treatment. The air diffuser 50 is connected to the blower 8 through a blower pipe 83. Further, the first Miyoshi aerobic treatment tank 5, inlet 52 is provided for flowing the treated water W ₂ from the second aerobic treatment tank 3 while discharging the treated water W _4, the overflow process water W ₅ A discharge portion 53 for discharging is provided. The discharge portion 52 provided in the lower portion of the Miyoshi aerobic treatment tank 5 is connected to the flow path L _4, the flow path L ₄ are, the solenoid valve, the flow channel L _16, solenoid valve, the flow path L _2, is connected to a channel L ₁₂ which treated water W ₂ flows from the second aerobic treatment tank 3 through a pump P ₁ and the solenoid valve. Further, the discharge portion 53 provided on top of the Miyoshi aerobic treatment tank 5 is connected to the flow channel L _17.

  Next, operation | movement of the processing apparatus 1 in this embodiment is demonstrated based on FIGS.

As shown in FIG. 3, the organic waste water W ₀ to be treated is pumped up by the pump P ₁ from the organic waste water supply port, and is controlled by the flow path L ₁ , the flow path L ₂ , and a control device (not shown). through the solenoid valve and the flow path L _3, it flows from the inlet 24 of the first aerobic treatment tank 2. Or path by the flow path _L 1 _{~L 17} that mentioned and organic waste water _{W 0} and treated water _W 1 to _W-5 described below to transfer, by the electromagnetic valve controlled by the control device, the flow path _L 1 _{~L 17} It is configured by switching. When the organic waste water W ₀ is accumulated in the first aerobic treatment tank 2, the starch decomposing enzyme solution 71 is added from the enzyme adding device 7, and the enzymatic decomposition treatment of the starch contained in the organic waste water W ₀ is performed. By this enzymatic decomposition treatment, starch (carbohydrate) contained in the organic waste water is converted into saccharides having a molecular weight smaller than that of starch. Therefore, organic substances are efficiently decomposed in the subsequent aerobic treatment.

When organic wastewater W ₀ to be treated contains boiled noodle soup and the temperature of the wastewater is relatively high, the enzymatic activity of the starch-degrading enzyme will increase, so that the enzymatic degradation treatment will be carried out more efficiently. Can do. The water temperature in the first aerobic treatment tank 2 is monitored by a temperature sensor 21, and a signal from the temperature sensor 21 is transferred to the control device until the water temperature in the tank drops to a constant temperature. Control is performed so that the inflow of the treated water W ₄ from the three aerobic treatment tanks 5 is in a standby state and the enzymatic decomposition reaction in the first aerobic treatment tank 2 is maintained. For example, when waste water of about 60 ° C. flows into the first aerobic treatment tank, the first aerobic treatment water W ₄ from the third aerobic treatment tank 5 is controlled by the control device until the waste water temperature drops to about 40 ° C. Control is performed so that inflow into the treatment tank 2 is not performed, and control is performed so that the decomposition treatment by the starch degrading enzyme in the above temperature range is efficiently performed.

  Note that the above-described decomposition treatment with an enzyme is not necessarily performed, and may be appropriately selected depending on components contained in waste water. In addition, for example, organic wastewater containing a large amount of protein and fat can be subjected to an enzymatic decomposition treatment using a proteolytic enzyme, lipase or the like instead of the above-mentioned starch degrading enzyme.

Then, as shown in FIG. 4, after the enzymatic decomposition treatment is performed, the aerobic treatment is subsequently performed in the first aerobic treatment tank 2. At this time, the treated water W ₄ from the third aerobic treatment tank 5 passes from the flow path L ₄ through the electromagnetic valve, the flow path L ₅ , the pump P ₁ , the flow path L ₂ , the electromagnetic valve and the flow path L ₃ , It flows from the inflow part 24 of the aerobic treatment tank 2. The inflow of the treated water W ₄ into the first aerobic treatment tank is controlled by the control device through the electromagnetic valve, the pump P _{1 and the} like, and is introduced until a certain water level is reached. Since this treated water W ₄ has been subjected to the first aerobic treatment, the second aerobic treatment, and the third aerobic treatment, the concentration of TOC, BOD, COD, etc. in the treated water W ₄ is treated. lower than those contained in the organic waste water W ₀ to be. Therefore, the concentration of TOC, BOD or COD in the organic waste water in the first aerobic treatment tank 2 is reduced, and the organic load per unit volume in the first aerobic treatment tank is reduced.

Thus, the first aerobic treatment tank 2, the organic waste water W ₀ and treated water W ₄ are satisfied, is carried out aeration by the air diffuser 20, aerobic treatment is carried out. A plurality of microorganism fixing carriers 22 on which aerobic microorganisms that perform aerobic treatment are fixed are arranged in the first aerobic treatment tank 2. By using the microorganism fixing carrier 22, fluctuations in the number of aerobic microorganisms due to transfer of the treated water W ₁ discharged from the first aerobic treatment tank 2 can be prevented, and stability in the entire first aerobic treatment tank 2 can be achieved. High-efficiency processing can be performed. The microorganism fixing carrier 22 is not particularly limited, but may be of a size that does not flow out from the drainage part 23 provided in the lower part of the first aerobic treatment tank 2, such as a BB material (product of Kikuchi Eco Earth Co., Ltd.). ) Etc. are used. By the aerobic treatment in the first aerobic treatment tank 2, for example, the purification of organic substances contained in the organic waste water W ₀ is progressing, for example, saccharides produced by enzymatic decomposition of starch are decomposed to produce organic acids. To do.

Furthermore, the treated water W ₁ from the first aerobic treatment tank 2 is extracted and transferred from the discharge unit 23 provided at the lower part of the first aerobic treatment tank 2. At this time, the first aerobic treatment tank 2 is used. excess sludge generated in the 2 also withdrawn along with the transfer of treated water W _1. Therefore, in the maintenance management of the processing apparatus 1, it is not necessary to extract and clean the excess sludge in the first aerobic processing tank 2, and maintenance is easy.

Next, as shown in FIG. 5, the treated water W ₁ from the first aerobic treatment tank 2 is pumped up by the pump P _{2 and} from the flow path L ₆ to the electromagnetic valve, the flow path L ₇ , the electromagnetic valve and the flow path. through L _8, it flows from the second aerobic treatment tank 3 of the inlet portion 35. Flowing into the second aerobic treatment tank 3 for the treated water W ₁ is controlled by the control device via the solenoid valve and pump P _2, and the like. Then, the treated water filled in the second aerobic treatment tank 3 is aerated by the aeration device 30 and aerobic treatment is performed. Similar to the state in the first aerobic treatment tank 2 described above, a plurality of aerobic microorganisms that perform the aerobic treatment are fixed to the microorganism fixing carrier 32 and arranged in the second aerobic treatment tank 3. By using a microorganism-immobilized carrier 32, prevents the variation of aerobic microbial count by transfer of treated water W ₂ discharged from the second aerobic treatment tank 3, stability of the entire second aerobic treatment tank 3 High-efficiency processing can be performed. The microorganism fixing carrier 32 is not particularly limited, but may be of a size that does not flow out from the drainage parts 33 and 34 provided in the lower part of the second aerobic treatment tank 3, for example, a BB material (Kikuchi Eco Earth Co., Ltd.). Company products). By the aerobic treatment in the second aerobic treatment tank 3, for example, the organic acid purification process further proceeds, for example, the organic acid generated in the first aerobic treatment tank 2 is decomposed.

Furthermore, the treated water W ₂ from the second aerobic treatment tank 3 is drawn out and transferred from the discharge parts 33 and 34 provided at the lower part of the second aerobic treatment tank 3. excess sludge generated in the treatment tank 3 is also withdrawn together with the transfer of treated water W _2. Therefore, in the maintenance management of the processing apparatus 1, it is not necessary to draw out and clean excess sludge in the second aerobic processing tank 3, and maintenance is easy.

Next, as shown in FIG. 6, the treated water W ₂ from the second aerobic treatment tank 3 is pumped up by the pump P ₁ , and the electromagnetic valve, the flow path L ₂ , the electromagnetic valve, the flow path from the flow path L _12. It passes through L ₁₃ , the electromagnetic valve and the flow path L _14, and flows from the inflow portion 42 a of the filtration processing tank 4 a. Flowing into the filtration treatment tank 4a of the treated water W ₂ is controlled by the control device via an electromagnetic valve and the pump P ₁ and the like. The treated water W ₂ which has flown into the filtration tank 4a flows down from the gap of the filter material 40a filled in the filtration tank 4a downward. In this case, suspended solids (SS) or the like including an excess sludge generated in the aerobic treatment tank contained in the treated water W ₂ is removed is adsorbed to the filtering material 40a. Treated water W _3a which is purified by passing through a gap of the filter material 40a passes through the flow path L ₁₅ and the solenoid valve from the lower portion of the discharge portion 41a of the filtration tank 4a, again the upper part of the second aerobic treatment tank 3 It flows in from the inflow part 36 provided. In this manner, the treated water W ₂ and W _3a are configured to circulate between the second aerobic treatment tank 3 and the filtration treatment tank 4a.

The filtration in the filtration treatment tank 4a, treated water W suspended solids (SS) and the like decreases contained in _2, it can be obtained a turbidity of less treated water. Then, for circulating the processing water W ₂ and W ₃ between the second aerobic treatment tank 3 and the filtering processing tank 4a, it is possible to obtain a longer time of aerobic treatment of the treated water, the decomposition of organic matter further Promoted. Moreover, since the excess sludge generated in each aerobic treatment tank is adsorbed and removed by the filtration material 40a of the filtration treatment tank 4a, the filtration material 40a in the filtration treatment tank 4a is removed when the excess sludge of the treatment apparatus 1 is removed and cleaned. The maintenance is easy.

On the other hand, also in the filtration tank 4b shown in FIG. 6, the electromagnetic valve from the treated water W ₂ is pumped by the pump P ₂ flow path L ₉ from the second aerobic treatment tank 3, the flow path L _7, solenoid valve and passed along the flow _{L 10,} it flows from the inlet portion 42b of the filtration tank 4b. Flowing into the filtration treatment tank 4b of the treated water W ₂ is controlled by the control device via the solenoid valve and pump P _2, and the like. The treated water W ₂ which has flown into the filtration tank 4b flows down from the gap of the filter material 40b filled in the filtration tank 4b downward. In this case, suspended solids (SS) or the like including an excess sludge generated in the aerobic treatment tank contained in the treated water W ₂ is removed is adsorbed to the filtering material 40b. Treated water W _3b which is purified by passing through a gap of the filter material 40b passes through the flow path L ₁₁ and L ₈ from the lower portion of the discharge portion 41b of the filtration tank 4b, again the upper part of the second aerobic treatment tank 3 It flows in from the inflow part 35 provided. Thus, similarly to the filtration tank 4a described above, between the second aerobic treatment tank 3 and the filtering processing tank 4b, treated water W ₂ and W _3b is configured so as to circulate, acting effect Is the same.

  In addition, an aeration apparatus can be provided in each of the filtration treatment tank 4a and the filtration treatment tank 4b, and aerobic treatment by aeration can be performed together with the filtration treatment.

Next, as shown in FIG. 7, the treated water W ₂ from the second aerobic treatment tank 3 is pumped up by the pump P ₁ , and the electromagnetic valve, the flow path L ₂ , the electromagnetic valve, the flow path from the flow path L _12. It flows from the inlet 52 of the third aerobic treatment tank 5 through L ₁₆ , the electromagnetic valve and the flow path L ₄ . Flowing into the Miyoshi anaerobic treatment tank 5 of this treated water W ₂ is controlled by the control device via an electromagnetic valve and the pump P ₁ and the like. And about the treated water with which the 3rd aerobic processing tank 5 is filled, aeration apparatus 50 aerates and an aerobic process is performed. The aerobic microorganisms that perform the aerobic treatment are fixed to the microorganism fixing carrier 51 in the third aerobic treatment tank 5 in the same manner as in the first aerobic treatment tank 2 and the second aerobic treatment tank 3 described above. Several are arranged. By using a microorganism-immobilized carrier 51, it can be performed while preventing variation of aerobic microbial count by transfer of treated water W _4, and stable high efficiency treatment of the whole first Miyoshi anaerobic treatment tank 5. The microorganism fixing carrier 51 is preferably of a size that does not flow out from the drainage part (inflow part) 52 provided in the lower part of the third aerobic treatment tank 5, for example, BB material (product of Kikuchi Eco Earth Co., Ltd.). Etc. are used. The aerobic treatment in the first Miyoshi anaerobic treatment tank 5, most of the organic substances contained in the organic waste water W ₀ to be treated is decomposed. The supernatant of treated water W ₅ of the Miyoshi aerobic treatment tank 5, which is purified is discharged out of the processing apparatus 1 by the overflow from the discharge portion 53 provided on top of the Miyoshi temper treatment tank.

Further, the treated water W ₄ from the third aerobic treatment tank 5 is extracted and transferred from the discharge part 52 provided at the lower part of the third aerobic treatment tank 5. At this time, the third aerobic treatment tank 5 excess sludge generated in the 5 also withdrawn along with the transfer of treated water W _4. Therefore, in the maintenance management of the processing apparatus 1, it is not necessary to draw out and clean the excess sludge in the third aerobic processing tank 5, and maintenance is easy.

  The processing apparatus 1 in this embodiment can be used in any processing method of continuous processing, batch processing, or semi-continuous processing in which these are combined.

  Next, the organic waste water treatment apparatus 10 according to the second embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 8, the second processing unit 10 of the organic waste water in an embodiment of the present invention includes a treatment tank 6 before performing the enzymatic degradation of starch contained in the organic waste water W ₀ that has flowed. The pretreatment tank 6 is connected to the first aerobic treatment tank 2, and the treated water W ₆ that has been subjected to the enzymatic decomposition treatment is transferred from the pretreatment tank 6 to the first aerobic treatment tank 2 and is aerobic. Processing is performed. The configuration of the treatment apparatus 10 after the treated water W ₆ is transferred to the first aerobic treatment tank 2 is the same as that of the first embodiment.

In the present embodiment, the enzymatic decomposition treatment of starch (carbohydrate) contained in the organic waste water W ₀ is performed in the pretreatment tank 6. Therefore, a stable enzymatic decomposition treatment can be performed. By this enzymatic decomposition treatment, the starch (carbohydrate) contained in the organic waste water W ₀ is converted into saccharides having a molecular weight smaller than that of starch, and the organic matter is efficiently decomposed in the subsequent aerobic treatment.

In addition, when the organic waste water W ₀ contains boiled noodle soup, the temperature of the waste water is often higher than that of general waste water, which may affect the aerobic treatment. The high temperature organic waste water W ₀ can be cooled to an appropriate temperature in the pretreatment tank 6. In this case, since the enzyme activity of the starch degrading enzyme is also increased, the enzyme decomposing treatment can be performed more efficiently. The treated water W ₆ that has been cooled and enzymatically decomposed in the pretreatment tank 6 is subjected to an aerobic treatment in the first aerobic treatment tank 2.

  Next, an organic wastewater treatment apparatus in the third embodiment of the present invention will be described.

  The apparatus for treating organic wastewater according to the third embodiment of the present invention includes a first treatment unit that performs aerobic treatment of organic wastewater, and a first treatment unit that performs filtration of the treated water aerobically treated by the first treatment unit. And a third processing means for performing a further aerobic treatment of the treated water aerobically treated by the first processing means. And at least a part of the treated water filtered by the second treatment means returns to the first treatment means, and the treated water circulates between the first treatment means and the second treatment means. Has been. Furthermore, at least a part of the treated water that has been further aerobically treated by the third treatment means is configured to return to the first treatment means.

  The first treatment means in the present embodiment is not particularly limited as long as the organic waste water can be subjected to aerobic treatment with aerobic microorganisms, but specifically, the dispersion in the aerobic treatment tank. Examples include aeration using an air device. The first treatment means includes a microorganism fixing carrier for immobilizing the aerobic microorganisms in the first treatment means so that the aerobic microorganisms in the treatment means are not affected by the transfer of the treated water. Preferably it is. Then, the treated water transferred from the first treatment means to the inside of the treatment means or to other treatment means is provided with a discharge portion at the lower part of the treatment means so as to be extracted together with excess sludge generated in the first treatment means. Preferably it is. Furthermore, the first treatment means may be composed of a plurality of aerobic treatment tanks, and an enzyme addition device for enzymatically decomposing starch, protein and the like contained in the supplied organic waste water can be provided.

  Next, the second treatment means in the present embodiment is not particularly limited as long as it is configured to be able to perform filtration treatment on the treated water from the first treatment means. Examples thereof include a filtration treatment with a filter medium filled in the treatment tank. And the 2nd processing means may be constituted from a plurality of filtration processing tanks, in order to raise filtration efficiency.

  The third treatment means in the present embodiment is not particularly limited as long as the third treatment means can perform aerobic treatment with aerobic microorganisms on the treated water from the first treatment means. May be aeration using an air diffuser or the like in an aerobic treatment tank. Further, the third treatment means is provided with a microorganism fixing carrier for immobilizing the aerobic microorganisms in the third treatment means so that the aerobic microorganisms in the treatment means are not affected by the transfer of the treated water. Preferably it is. Then, the treated water transferred from the third treatment means to the inside of the treatment means or to other treatment means is provided with a discharge part at the lower part of the treatment means so as to be extracted together with excess sludge generated in the third treatment means. Preferably it is. The third processing means may be composed of a plurality of aerobic processing tanks.

  In addition to the first processing means, the second processing means, and the third processing means, the processing apparatus in the present embodiment performs an enzymatic decomposition process for starch contained in the organic wastewater supplied to the first processing means. Pre-processing means can also be provided. Further, it is possible to provide other processing means.

  The operation of the processing apparatus in this embodiment will be described below.

  The organic waste water is supplied to the first processing means through piping or the like, and aerobic processing is performed. At this time, the treated water from the third treatment means partially returns to the first treatment means through piping or the like and is mixed with the supplied organic waste water. Since the treated water from the third treatment means has already been subjected to the aerobic treatment by the first treatment means and the third treatment means, the concentration of TOC, BOD, COD, etc. in the treated water is supplied. Low compared to that contained in organic wastewater. Therefore, the concentration of TOC, BOD, COD or the like in the organic waste water to be processed in the first processing means is reduced, and the organic load per unit volume in the first processing means is reduced.

  Thus, in the 1st processing means, aeration by a diffuser etc. is performed about the supplied organic waste water and the treated water from the 3rd processing means, and aerobic processing is performed. The microorganism fixing carrier on which aerobic microorganisms for aerobic treatment are fixed is not particularly limited, but is preferably a size that does not flow out from the drainage part provided at the lower part of the first processing means, for example, BB material (Product of Kikuchi Eco Earth Co., Ltd.) is used. By the aerobic treatment in the first treatment means, for example, the purification of the organic matter contained in the supplied organic waste water proceeds such that the saccharide produced by the enzymatic decomposition of starch is decomposed to produce an organic acid. .

  Furthermore, the treated water from the first treatment means is drawn out from the discharge section provided at the lower portion of the first treatment means and transferred. At this time, the excess sludge generated by the first treatment means is also treated water. It is withdrawn along with the transfer. Therefore, in the maintenance management of the processing apparatus, it is not necessary to draw out and clean the excess sludge generated in the first processing means, and maintenance is easy.

  Then, the treated water that has been subjected to the aerobic treatment by the first treatment means is transferred to the second treatment means through a pipe or the like. The treated water that has flowed into the second treatment means flows down from the gap of the filter medium or the like filled in the second treatment means, and the suspended matter (SS) containing excess sludge contained in the treated water is filtered. It is adsorbed and removed by the material. The treated water that has been purified by passing through a gap such as a filter medium returns to the first treatment means again through piping or the like so that the treated water circulates between the first treatment means and the second treatment means. It is configured.

  By the filtration treatment in the second treatment means, suspended matter (SS) contained in the treated water is reduced, and treated water with low turbidity can be obtained. And since treated water circulates between a 1st process means and a 2nd process means, the time of the aerobic process of treated water can be taken long, and decomposition | disassembly of organic substance is further accelerated | stimulated. Moreover, since the excess sludge generated by the aerobic treatment is adsorbed and removed by the filter medium or the like of the second processing means, the filter medium or the like in the second treatment means is removed when the excess sludge from the processing apparatus is removed and cleaned. It only needs to be replaced, and maintenance is easy.

  Next, the treated water from the first treatment means is transferred to the third treatment means through piping or the like. And aeration by a diffuser etc. is performed and an aerobic process is performed. As the microorganism fixing carrier on which aerobic microorganisms for aerobic treatment are fixed, the same carrier as the first treatment means is used. By the aerobic treatment in the third treatment means, most of the organic matter contained in the supplied organic waste water is decomposed. The supernatant of the treated water from the purified third processing means can be discharged out of the processing apparatus by overflow or the like from, for example, a discharge part provided at the upper part of the third processing means.

  Furthermore, the treated water from the third treatment means is drawn out from the discharge section provided at the lower part and transferred to the first treatment means. At this time, excess sludge generated in the third treatment means is also treated water. It is withdrawn along with the transfer. Therefore, in the maintenance management of the processing apparatus, it is not necessary to extract and clean the excess sludge generated in the third processing means, and maintenance is easy.

  The first processing means, the second processing means, and the third processing means of the processing apparatus in this embodiment can be used in any processing method of continuous processing, batch processing, or semi-continuous processing in which these are combined.

  Hereinafter, the present invention will be described in detail with reference to examples.

  The processing apparatus 1 according to the first embodiment shown in FIG. 2 is set with the contents and conditions shown in Table 1 below. As the filter medium filled in the filtration tank A and the filtration tank B, flame charcoal was used. In addition, 15 to 30 BB materials (product of Kikuchi Eco Earth Co., Ltd.) were installed in the first aerobic treatment tank, the second aerobic treatment tank, and the third aerobic treatment tank as microorganism fixing carriers. The aeration by the air diffuser and the circulation between the second aerobic treatment tank and the filtration treatment tank A and the filtration treatment tank B were set to be always performed.

  Using the treatment device set in this way, the waste water discharged from a certain udon store was purified. This udon store has a boiled kettle with a capacity of 300L, and several hundreds of liters of wastewater are generated a day. The wastewater collected from the boiled kettle contained a large amount of starch contained in the udon powder, the COD was 2693 (mg / L), the TOC was 1941 (mg / L), and the pH was 3.72. Also, this wastewater was hot because it was discharged from the boiled boiled udon.

  The organic wastewater from this udon store was treated as follows. First, the high temperature waste water discharged from the boiled kettle was introduced into the first aerobic treatment tank. Next, using an enzyme addition apparatus, amylase was added to the waste water so that the concentration of amylase was 0.3%. After the enzyme addition, the water temperature in the first aerobic treatment tank was monitored with a temperature sensor, and the enzyme reaction step was maintained until the water temperature dropped to 42 ° C. After the water temperature dropped to 42 ° C., the treated water from the third aerobic treatment tank that had already been subjected to the aerobic treatment was returned until the inside of the first aerobic treatment tank became full. About the treated water in the 1st aerobic processing tank obtained here, the aeration from a diffuser was performed and the aerobic process was performed.

  Next, about 35 L of treated water from the first aerobic treatment tank is transferred to a second aerobic treatment tank already filled with treated water to some extent by continuous treatment, and aerobic treatment is carried out for about 2 hours after the transfer. went. In the second aerobic treatment tank, in addition to the aerobic treatment, the treated water was circulated between the second aerobic treatment tank and the filtration treatment tank A or the filtration treatment tank B to perform filtration treatment. After 2 hours, about 35 L of treated water from the second aerobic treatment tank was transferred to the third aerobic treatment tank already filled with treated water by continuous treatment. By this transfer, a part of the treated water that reached the overflow discharge part at the top of the third aerobic treatment tank was discharged out of the apparatus. The remaining treated water was aerated by an aeration device and aerobic.

  In this way, the treated water from the first aerobic treatment tank is transferred to the second aerobic treatment tank by about 35 L every 2 hours and discharged from the udon store by performing the subsequent aerobic treatment and filtration treatment. One day of organic wastewater was processed. Table 2 below shows the measurement results of the TOC concentration and the organic acid concentration contained in the treated organic water and the treated water collected from each aerobic treatment tank.

  As a result, the TOC concentration of organic waste water showing 2000 mg / L or more decreases as the aerobic treatment progresses, and in the final third aerobic treatment tank, the waste water reference value (Kagawa Prefecture), which is 160 mg / L, is increased. A lower 86 mg / L was indicated. Furthermore, organic wastewater containing a lot of starch, such as wastewater from udon stores, generated organic acid by aerobic treatment, and the pH of the treated water was lowered and the bad odor of organic acid itself became a problem. After the aerobic treatment in the third aerobic treatment tank, the organic acid was almost decomposed, and the pH of the treated water in the third aerobic treatment tank also showed a neutral value.

  The present invention is not limited to the above-described embodiments and examples, and variously modified forms are included in the technical scope without departing from the gist of the invention described in the claims. Is.

DESCRIPTION OF SYMBOLS 1, 10 Organic wastewater processing apparatus 2 First aerobic treatment tank 20 Aeration apparatus 21 Temperature sensor 22 Microorganism fixing carrier 23 Discharge part 24 Inflow part 3 Second aerobic treatment tank 30 Aeration apparatus 31 Temperature sensor 32 Microorganism fixation carrier 33 Discharge part 35, 36 Inflow part 4, 4a, 4b Filtration processing tank 40a, 40b Filter material 41a, 41b Discharge part 42a, 42b Inflow part 5 Third aerobic treatment tank 50 Aeration device 51 Microorganism fixing carrier 52 Discharge part ( Inflow part)
53 overflow discharge portion 6 pretreatment tank 7 enzyme addition device 70 chemical tank 71 enzyme solution 72 pipe 73 pump 8 Blower 81, 82, 83 blower pipe L ₁ ~L ₁₇ passage P _{1, P 2} pumps W ₀ to be processed organic Waste water W ₁ , W ₂ , W ₃ , W ₄ , W _5, W ₆ treated water

Claims (3)

A first aerobic treatment tank to perform aerobic treatment of organic wastewater, the first additional good aerobic treated treated water is transferred from the first aerobic treatment tank with being connected to an aerobic treatment tank filtration performing a second aerobic treatment tank to perform temper process, the second filtration process further aerobic treated treated water is transferred from the second aerobic treatment tank with being connected to an aerobic treatment tank a processing tank, and a second Miyoshi aerobic treatment tank to perform the second aerobic treatment additional aerobic treated treated water is transferred from the second aerobic treatment tank with being connected to an aerobic treatment tank Prepared,
Wherein between the filtration treatment tank and said second aerobic treatment tank, a treated water is transferred from the filtration treatment process water and said second aerobic treatment tank is filtration by tank configured to circulate ,
Wherein said Miyoshi anaerobic treatment tank, the first connected to the aerobic treatment tank, transferring at least a portion of the treated water that is aerobic treatment by the first Miyoshi anaerobic treatment tank to the first aerobic treatment tank the configured to Rutotomoni, consists supernatant of the treated water which is aerobic treatment by said Miyoshi aerobic treatment tank so as to discharge to the outside,
The treated water transferred from the first aerobic treatment tank, the second aerobic treatment tank, and the third aerobic treatment tank is respectively drawn out from the discharge part provided at the lower part of each aerobic treatment tank and transferred. An organic wastewater treatment apparatus , wherein suspended matter containing excess sludge generated in each aerobic treatment tank contained in the treated water is filtered in the filtration treatment tank . The first aerobic treatment tank, the organic waste water processing device according to claim 1, characterized in that said the second aerobic treatment tank and said second Miyoshi anaerobic treatment tank is arranged microorganism-immobilized carrier . The first is connected to the aerobic treatment tank, the organic waste water processing system according to claim 1 or 2, characterized in that it comprises a pretreatment tank for performing enzymatic degradation of starch contained in the organic waste water.

Images