JP2015150539A - Reactor for biological treatment, water treatment facility, and operation method of reactor for biological treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reactor for biological treatment that can be easily installed regardless of type of water treatment facility and prevents a biological treatment auxiliary agent storage part from being clogged by foreign substances without performing maintenance over a long period of time.SOLUTION: A reactor for biological treatment is configured to comprise: a biological treatment auxiliary agent holding part 11 that is filled with a biological treatment auxiliary agent making a specific microorganism group dominant in sludge; a sludge retaining tank 12 that accommodates the biological treatment auxiliary agent holding part 11; an inflow part 13 that allows sludge in a sludge return passage of a water treatment facility to be received in the sludge retaining tank 12; a discharge par 14 for returning the received sludge to the water treatment facility; a circulation mechanism 16 that circulates and supplies sludge flowing in through the inflow part 13 to the biological treatment auxiliary agent holding part 11 in the sludge retaining tank 12; and a filter mechanism 17 that is disposed so as to capture foreign substances in the sludge circulated and supplied to the biological treatment auxiliary agent holding part 11 by the circulation mechanism 16 and to discharge the captured foreign substances together with the sludge when the sludge is discharged from the discharge part 14.

Description

  The present invention relates to a biological treatment reactor, a water treatment facility, and a biological treatment reactor operating method in which a biological treatment aid that predominates a specific microorganism group is brought into contact with sludge for biological treatment of organic wastewater.

  Sewage such as human waste and septic tank sludge brought into a water treatment facility that biologically treats organic wastewater is temporarily stored in the storage tank after pretreatment is performed to remove unsuitable materials such as residue mixed in the sewage. The water is quantitatively sent from the storage tank to the biological treatment tank. The biologically treated water is separated into solid and liquid, the liquid component is subjected to advanced treatment such as activated carbon filtration and then released into rivers, and the solid component is dehydrated with a filter press dehydrator and then incinerated. The

  In such a conventional water treatment facility, there has been a problem that a large amount of cost and facilities are required for measures against malodor generated in the process of biological treatment, treatment of excess sludge, and the like.

  Therefore, the inventors of the present application supply a biological treatment aid to a treatment tank of a water treatment apparatus that employs the activated sludge method, thereby dominating a specific microflora in the sludge and improving the wastewater treatment capacity. The technology is being researched and developed, and the generation of malodors and the amount of surplus sludge are expected to be reduced by biological treatment using such microbiota.

  By the way, in Patent Document 1, as an example of a biological treatment aid, a microbial metabolic circuit inducing material containing humic substances and substances having an activated or unstable andesite or rhyolite composition is used as sludge. A simple device for producing seed sludge that reveals the phenolic metabolic function of the soil bacteria group by supplying the soil bacteria group therein is disclosed.

  The simple sludge production apparatus includes an aeration nozzle that is installed below a container by immersing a container filled with a microbial metabolic circuit inducing material and having a top surface and a bottom surface made of wire mesh or punching metal in the biological treatment tank. The biological treatment aid is eluted in the water to be treated by aeration from the water, generating an upward flow in the container and flowing the water to be treated.

Japanese Patent Publication No. 5-10999

  However, in a water treatment facility that biologically treats organic wastewater such as human waste, each treatment tank such as a biological treatment tank or a solid-liquid separation tank is maintained in a sealed state from the viewpoint of avoiding the spread of bad odors. Since only a small lid is provided, a container of a certain size filled with a biological processing aid as described in Patent Document 1 is immersed in such a processing tank or for maintenance. It was difficult to put in and out, and there was a problem that a major modification of the treatment tank was required.

  In addition, the contaminants in the sewage are removed by the pretreatment equipment as described above, but a part of the sewage flows into each treatment tank without being removed. There is a risk that the contaminants may become entangled and blocked, preventing the smooth elution of the biological treatment aid, and corrosive substances such as hydrogen sulfide generated during the biological treatment may corrode the wire mesh or punching metal. It was difficult to immerse and arrange in the treatment tank for a long time.

  In view of the above-mentioned problems, the object of the present invention is to easily install even a water treatment facility that does not have a large opening in a treatment tank and treats organic wastewater such as human waste and septic tank sludge. The object of the present invention is to provide a biological treatment reactor, a water treatment facility, and a biological treatment reactor operating method in which the biological treatment aid container is prevented from being blocked by foreign substances without maintenance.

  In order to achieve the above-mentioned object, the first characteristic configuration of the biological treatment reactor according to the present invention is a biological treatment aid holding part filled with a biological treatment aid that predominates a specific microorganism group in sludge, A sludge retention tank in which the biological treatment assistant holding part is accommodated, an inflow part for receiving sludge in a sludge return path of a water treatment facility into the sludge retention tank, and a discharge part for returning the accepted sludge to the water treatment facility; A circulation mechanism that circulates and feeds the sludge flowing in from the inflow part to the biological treatment aid holding part in the sludge retention tank, and a contaminant from the sludge that is circulated and supplied to the biological treatment aid holding part by the circulation mechanism And a filter mechanism arranged so that the captured contaminants are discharged along with the sludge when the sludge is discharged from the discharge portion.

  According to the above configuration, while the sludge that has flowed into the sludge retention tank from the inflow portion stays in the tank, when the sludge is circulated and supplied to the biological treatment aid holding portion by the circulation mechanism, The biological treatment aid is efficiently eluted by increasing the contact frequency, and such sludge is discharged from the discharge section and returned to the water treatment facility, and is identified as sludge in the sludge retention tank and / or water treatment facility. The microbial community becomes dominant.

  Then, since the sludge in which the contaminants are captured by the filter mechanism is circulated and supplied to the biological treatment aid holding unit, the biological treatment aid holding unit is not clogged with the contaminants and is captured by the filter mechanism. Since the contaminated waste is discharged along with the sludge when the sludge is discharged from the discharge portion, the maintenance work for cleaning the filter mechanism is also reduced.

  For example, when the above-mentioned biological treatment reactor is arranged in the sludge return path for returning sludge to the water treatment facility, there is no need to make major modifications to each existing treatment tank, and sludge after biological treatment Since the concentration of corrosive substances such as hydrogen sulfide contained in is extremely low, the biological treatment aid holding part or the like is not corroded.

  In addition to the first characteristic configuration described above, the biological processing aid holding unit includes a storage unit that stores a biological processing aid and the storage unit, as described in claim 2. A pair of sludge flow surfaces for holding the biological treatment aid accommodated in the section and allowing the sludge to flow therethrough are configured so that the sludge circulates in the storage section through the sludge flow surface, The filter mechanism is disposed upstream of the sludge flow surface on the sludge inflow side.

  According to the above-described configuration, the sludge is circulated and supplied to the biological treatment aid holding unit so as to flow into the biological treatment aid holding unit from one sludge flow surface and out of the other sludge flow surface, and the process The biological treatment aid elutes. At this time, a filter mechanism is arranged upstream of one sludge flow surface into which the sludge flows, and contaminants contained in the sludge are captured by the filter mechanism in advance. Occlusion is effectively avoided.

  In addition to the second feature configuration described above, the third feature configuration of the third feature configuration includes three side surfaces of the biological treatment aid holding portion formed in a rectangular shape in plan view, and the sludge retention Sludge that is in contact with each inner wall surface of the tank and is accommodated in the sludge retention tank so that the other one side surface is separated from the other inner wall surface of the sludge retention tank, and that flows through the pair of sludge flow surfaces, A sludge circulation flow that flows through a separation region between the inner wall surface of the sludge retention tank and the side surface of the biological treatment aid holding part is formed.

  According to the above-described configuration, the three sides of the biological treatment aid holding unit can be shared with the wall surface of the sludge retention tank, and the sludge circulation channel that is circulated and supplied to the biological treatment aid holding unit is the sludge retention tank. The filter mechanism is installed only on the upstream side of the biological treatment assistant holding part in the circulation channel formed in the separation area. Therefore, a simple structure can be realized.

  In the fourth feature configuration, as described in claim 4, in addition to any of the first to third feature configurations described above, an opening / closing mechanism is provided in the discharge portion, and the filter mechanism includes the discharge mechanism. So that the foreign matter is captured from the sludge circulation flow to the biological treatment aid holding part when the part is closed, and the captured foreign substance is discharged along with the sludge that flows out to the discharge part when the discharge part is opened. The bioprocessing aid holding part and the discharge part are arranged.

  According to the above-described configuration, when the discharge part is opened by the opening / closing mechanism in the state where the sludge is circulated and supplied toward the biological treatment aid holding part by the circulation mechanism, the sludge in the sludge retention tank is discharged from the discharge part. It begins to flow as it is discharged. At this time, the contaminants disposed between the biological treatment aid holding part and the discharge part and captured by the filter mechanism are separated from the filter mechanism by the sludge flow flowing in the direction opposite to the circulation flow, and the sludge is left as it is. Since it is discharged from the discharge portion along with the flow, it is not necessary to artificially clean the filter mechanism.

  In the fifth feature configuration, in addition to any of the first to fourth feature configurations described above, the discharge portion is opened at least when the circulation mechanism is operating. It is in the point where it is constituted.

  By operating the circulation mechanism, the sludge in the sludge retention tank circulates toward the biological treatment aid holding part, and the biological treatment aid is efficiently eluted into the sludge. If the circulation mechanism is activated when the discharge part is opened, it is possible to avoid the backflow of sludge to the biological treatment aid holding part and the circulation mechanism of contaminants in the sludge, and thus the biological treatment aid holding part and the circulation mechanism. Clogging can be avoided. For example, the circulation mechanism only needs to be operating until the water level of the sludge is lowered from the upper surface of the biological treatment aid holding unit.

  In the sixth feature configuration, as described in claim 6, in addition to any one of the first to fifth feature configurations described above, the circulation mechanism generates an upward flow in the sludge so that the biological treatment is performed. It is in the point comprised by the air diffusion mechanism led to an auxiliary agent holding part.

  Due to the aeration supplied from the aeration mechanism arranged below the biological treatment assistant holding part, an upward flow is generated in the sludge from below to above the biological treatment assistant holding part. By this upward flow, a circulating flow through which sludge flows from the lower side to the upper side of the biological treatment assistant holding part is formed.

  In addition to any one of the first to sixth feature configurations described above, the seventh feature configuration includes the installation position of the discharge unit and the biological treatment assistant. An outflow part for allowing the sludge to flow out is provided at a position higher than the upper surface of the agent holding part.

  When it is necessary to continuously return the sludge from the biological treatment aid to the biological treatment tank, set the sludge water level of the sludge retention tank higher than the top of the outflow part and the biological treatment aid holding part. Thus, the sludge can be stably circulated to the biological treatment aid holding part, and the sludge eluted from the biological treatment aid can be discharged from the outflow part and returned to the biological treatment tank.

  In the eighth feature, as described in claim 8, in addition to any one of the first to seventh features described above, the filter mechanism is a corrosion-resistant metal material, resin material, or ceramic material. It is in the point that consists of.

  Even if the sludge contains a corrosive substance, corrosion can be avoided if the filter mechanism is made of a corrosion-resistant metal material, resin material or ceramic material.

  The characteristic configuration of the water treatment facility according to the present invention is that, as described in claim 9, the pretreatment facility for removing solid foreign matters from the organic waste water and the organic waste water from which the solid foreign matters have been removed by the pretreatment facility A water treatment facility comprising a single or a plurality of biological treatment tanks to be treated and a solid-liquid separation tank for solid-liquid separation of organic wastewater biologically treated in the biological treatment tank, from the water treatment equipment A biological treatment reactor having any one of the first to eighth characteristic configurations described above is incorporated in a sludge return path for returning a part of the extracted sludge to the water treatment facility.

  The biological treatment reactor will predominate specific microbial groups in the sludge, so water treatment facilities that can reduce the generation of malodors and reduce the amount of excess sludge generated by biological treatment using these microbiota. Can be realized.

  The first characteristic configuration of the operation method of the biological treatment reactor according to the present invention is that of the biological treatment reactor in which the sludge is brought into contact with the biological treatment aid to predominate the specific microorganism group. A sludge inflow step of stopping a sludge inflow after flowing a predetermined amount of sludge into a sludge retention tank from a water treatment facility for biologically treating organic wastewater, and a sludge inflow in the sludge inflow step. A sludge circulation step that circulates and supplies the biological treatment aid holding unit accommodated in the sludge retention tank and captures impurities on the upstream side of the sludge circulation flow to the biological treatment aid holding portion, and the sludge circulation step. And a sludge discharge step for discharging sludge from the sludge retention tank together with the foreign matter captured in step (b).

  The sludge that has flowed into the sludge retention tank at the sludge inflow step comes into contact with the biological treatment aid at the sludge circulation step, so that the biological treatment aid is eluted. At this time, since the contaminants are trapped on the upstream side of the sludge circulation flow, the contaminants are not entangled or clogged in the biological treatment aid holding part, and the biological treatment aid is efficiently eluted. And it returns to a biological treatment tank by a sludge discharge | emission step, and a specific microorganism group comes to dominate. As a result, the generation of odor gas is suppressed, and the generation of excess sludge is effectively reduced.

  The second characteristic configuration is an operation method of a biological treatment reactor in which sludge is brought into contact with a biological treatment aid to predominate a specific microorganism group, as described in claim 11, A sludge inflow step for causing sludge to flow into a sludge retention tank from a water treatment facility for biological treatment, and during the execution of the sludge inflow step, the supplied sludge is circulated and supplied to the biological treatment aid holding part accommodated in the sludge retention tank. In addition, a sludge circulation step that captures impurities on the upstream side of the sludge circulation flow to the biological treatment aid holding unit, and during the execution of the sludge circulation step, the biological treatment aid holding unit is circulated and supplied. A sludge outflow step for allowing a part of the sludge to flow out of the sludge retention tank, and a sludge with the contaminants captured in the sludge circulation step for a predetermined time during the execution of the sludge outflow step. In that it includes a sludge discharge step of al discharging, the.

  The sludge that has flowed into the sludge retention tank at the sludge inflow step comes into contact with the biological treatment aid at the sludge circulation step, so that the biological treatment aid is eluted. At this time, since the contaminants are trapped on the upstream side of the sludge circulation flow, the contaminants are not entangled or clogged in the biological treatment aid holding part, and the biological treatment aid is efficiently eluted. The sludge from which biological treatment aid is eluted continuously flows out in the sludge outflow step and is returned to the water treatment facility, for example, so that the generation of odorous gas is suppressed in the water treatment facility and the generation of excess sludge is effectively reduced. Will come to be. Moreover, since the contaminants captured in the sludge retention tank are discharged together with the sludge from the lower part of the sludge retention tank in a sludge discharge step repeated at a predetermined interval, the biological treatment reactor can be operated stably over a long period of time. It becomes like this.

  In the third feature configuration, as described in claim 12, in addition to the first or second feature configuration described above, the sludge discharge step starts discharging sludge while maintaining at least the sludge circulation flow. There is in point to do.

  For example, if the sludge circulation flow is maintained until the sludge water level falls below the upper surface of the biological treatment aid holding part, it is possible to avoid contamination of the sludge in the biological treatment aid.

  As described above, according to the present invention, even a water treatment facility that does not have a large opening in a treatment tank and treats organic wastewater such as human waste and septic tank sludge can be easily installed and maintained for a long period of time. The biological treatment reactor, the water treatment facility, and the operation method of the biological treatment reactor can be provided that can prevent the biological treatment assistant container from being clogged by foreign substances even without the contamination.

Schematic of a water treatment facility in which a biological treatment reactor according to the present invention is installed Perspective view of biological treatment reactor Enlarged view of the biological treatment assistant holding part of the biological treatment reactor It is explanatory drawing which shows the operating method of the reactor for biological treatment, Comprising: (a) is explanatory drawing of a sludge inflow step, (b) is explanatory drawing of a sludge circulation step, (c), (d) is description of a sludge discharge | emission step. Figure It is explanatory drawing of the capture | acquisition and discharge | emission of a contaminant by the filter mechanism of a biological treatment reactor, Comprising: (a), (b) is capture of a contaminant, (c) is explanatory drawing which shows discharge | emission of a contaminant. Time chart showing the control status of the biological treatment reactor circulation mechanism, inlet pipe valve, and outlet pipe valve (A), (b), (c), (d) is explanatory drawing of another embodiment of the reactor for biological treatment. (A), (b) is explanatory drawing of another embodiment of the reactor for biological treatment. It is explanatory drawing which shows the operating method of the biological treatment reactor of another embodiment, Comprising: (a) is explanatory drawing of a sludge inflow step, (b) is explanatory drawing of a sludge circulation step, (c) is description of a sludge discharge | emission step. Figure Explanatory drawing of another embodiment of the reactor for biological treatment

Hereinafter, a biological treatment reactor, a water treatment facility, and a biological treatment reactor operating method according to the present invention will be described.
As shown in FIG. 1, in a water treatment facility where a biological treatment reactor (hereinafter simply referred to as “reactor”) is installed, organic wastewater such as human waste and septic tank sludge carried by a human waste collection vehicle is After the organic wastewater that has been put into the receiving tank and is not suitable for biological treatment and solid foreign matters such as residue removed by the pretreatment facility is stored in the storage tank, the deep reaction tank, nitrification tank, denitrification tank, re-aeration tank, etc. Biological treatment in the biological treatment tank.

  The deep reaction tank is configured to be switched between anoxic and aerobic conditions at intervals of several hours, and two biological treatments can be performed in one tank. Moreover, since it has a depth of about 10 m deeper than a normal biological treatment tank, the water pressure is high near the tank bottom, the oxygen dissolution efficiency is high, and a highly efficient aerobic treatment can be performed.

  The nitrification tank is maintained in an aerobic state by an aeration device, and ammonia is nitrified by an aerobic microorganism, that is, decomposed into nitrate ions and nitrite ions, and normal phosphoric acid is taken in. Organic wastewater that has been biologically treated in the nitrification tank is an example of a solid-liquid separation tank after being transferred to a denitrification tank that is maintained in an anaerobic state, denitrified, and then aerobic again in a re-aeration tank. Solid-liquid separation in the precipitation tank.

  The liquid component subjected to the solid-liquid separation is discharged through a separation liquid storage tank, a coagulation separation facility, an advanced treatment facility, and a disinfection facility. On the other hand, the solid component is finally carried out of the field through a concentration tank, a sludge storage tank, and a sludge dehydrator, and processed. The liquid component generated in the dehydrator is returned to the biological treatment tank via the miscellaneous drainage tank. Part of the sludge that flows into the settling tank is returned to the deep reaction tank through the sludge return path as return sludge.

  In such a water treatment facility, the reactor according to the present invention is installed in a branch of a sludge return path for returning a part of excess sludge drawn from a re-aeration tank to a precipitation tank to a deep reaction tank.

  As shown in FIG. 2, the reactor 10 according to the present invention includes a biological treatment aid holding part 11, a sludge retention tank 12, an inflow pipe 13 as an inflow part, a discharge pipe 14 as a discharge part, and an outflow part. The outflow pipe 15, the circulation mechanism 16, and the filter mechanism 17 are provided.

  The biological treatment aid holding unit 11 is filled with a biological treatment aid that predominates the specific microorganism group in the returned sludge. The sludge retention tank 12 is a tank that accommodates the biological treatment assistant holding unit 11 therein and elutes the biological treatment assistant into the return sludge by bringing the return sludge into contact with the biological treatment assistant. The circulation mechanism 16 is a mechanism that circulates and supplies the sludge in the sludge retention tank 12 to the biological treatment aid holding unit 11 and actively elutes the biological treatment aid into the returned sludge, and the filter mechanism 17 holds the biological treatment aid. This is a mechanism for capturing foreign substances contained in the sludge flowing into the section 11.

  The inflow pipe 13 is a pipe that receives part of the sludge in the sludge return path into the sludge retention tank 12, and is provided with an open / close valve (see FIG. 1). The discharge pipe 14 is a pipe that discharges the sludge in the sludge retention tank 12 and returns it to the deep reaction tank, and is similarly provided with an open / close valve (see FIG. 1). The outflow pipe 15 is a pipe for overflowing the sludge eluted from the biological treatment aid from the sludge retention tank 12 and returning it to the deep reaction tank.

  In the present embodiment, the biological treatment aid holding unit 11 and the sludge retention tank 12 are all rectangular parallelepiped tanks. Further, among the side surfaces of the biological treatment aid holding unit 11, surfaces other than the front side in FIG. 2 are in contact with the sludge retention tank 12.

  As described above, the inlet pipe 13 and the outlet pipe 14 are each provided with a valve constituting an opening / closing mechanism. The sludge that has flowed into the sludge retention tank 12 by opening the valve of the inflow pipe 13 is circulated and supplied to the biological treatment assistant holding unit 11 while the contaminants are captured by the filter mechanism 17 while circulating in the tank by the circulation mechanism 16. It is discharged when a valve provided in the discharge pipe 14 is opened. In addition, an outflow pipe 15 is provided at a position higher than the attachment position of the discharge pipe 14 and the upper surface 11b of the biological treatment assistant holding part 11, and is configured to overflow the sludge that has reached the height of the outflow pipe 15. .

  The circulation mechanism 16 is disposed below the biological treatment assistant holding unit 11 and is configured by an air diffusion mechanism that generates an upward flow. For this reason, the return sludge flows from the bottom surface 11a of the biological treatment assistant holding part 11 to the housing part, flows out from the upper surface 11b, and descends along the path passing through the side part of the biological treatment assistant holding part 11. Is formed.

  That is, the three side surfaces of the biological treatment aid holding part 11 formed in a rectangular shape in plan view come into contact with the inner wall surfaces of the sludge retention tank 12 and the other one side surface is separated from the other inner wall surface of the sludge retention tank 12. The sludge which is accommodated in the sludge retention tank 12 and flows through the pair of sludge flow surfaces so that the separation area R between the inner wall surface of the sludge retention tank 12 and the side surface of the biological treatment assistant holding part 11 (see FIG. 4). A sludge circulation flow is formed so as to flow.

  The filter mechanism 17 is made of SUS304 punching metal having corrosion resistance, and is provided on the upstream side of the bottom surface 11 a into which the returned sludge flows into the biological treatment aid holding unit 11.

  Most of the contaminants contained in the sludge are removed by the pre-treatment equipment before being treated in the biological treatment tank, but it is impossible to remove all of them, and the unremoved contaminants are returned to the returned sludge. Is also included. The filter mechanism 17 preliminarily removes such contaminants so that the elution of the biological treatment aid is not hindered by entanglement of the contaminants with the bottom surface 11a or obstruction of the circulation flow. To capture.

  The filter mechanism 17 is installed between the biological treatment assistant holding unit 11 and the discharge pipe 14. Therefore, when the sludge is discharged by opening the valve of the discharge pipe 14, the sludge flows through the filter mechanism 17 in the direction opposite to the circulating flow direction, and the foreign matter captured by the filter mechanism 17 is released. Thus, it is configured to be discharged from the discharge pipe 14 together with the sludge. In addition, the shape of the hole of the punching metal which comprises the filter mechanism 17 may be circular, a rectangle, a polygon, a slit shape, or those combinations, for example.

  As shown in FIG. 3, the bottom surface 11 a and the top surface 11 b of the biological treatment aid holding unit 11 are made of punching metal having an opening similar to the filter mechanism 17 as a sludge flow surface through which the return sludge can flow. In addition, an accommodating portion 11c in which the biological treatment aid 11d is accommodated is provided. The sludge flows into the storage portion 11c through the bottom surface 11a and flows out of the storage portion 11c through the top surface 11b. At that time, the biological treatment aid 11d is eluted in the sludge. In addition, the opening is not formed in the side surface of the biological treatment adjuvant holding part 11, and sludge does not flow through.

  When the circulation mechanism 16 is stopped simultaneously with the opening of the discharge pipe 14 when discharging the sludge from the discharge pipe 14, the sludge containing impurities above the upper surface 11 b flows into the biological treatment aid holding unit 11. There is a risk that the side will be clogged with such contaminants. Therefore, it is preferable that the discharge pipe 14 is opened at least when the circulation mechanism 16 is operating. For example, the sludge height is lower than that of the upper surface 11b after the discharge pipe 14 is opened. After that, it is preferable to stop the circulation mechanism 16.

  Since the reactor 10 is arranged in the sludge return path for returning a part of the excess sludge extracted from the biological treatment tank to the biological treatment tank as return sludge, there is no need to make a major modification to each existing treatment tank. Furthermore, since the concentration of corrosive substances such as hydrogen sulfide contained in the returned sludge after biological treatment is extremely low, the biological treatment auxiliary holding part or the like is not corroded.

  In addition, the dimension of the biological treatment adjuvant holding part 11, the sludge retention tank 12, and the filter mechanism 17 demonstrated by this embodiment is an example, and this invention is not restrict | limited to these numerical values.

  The operation method of the reactor 10 includes a sludge inflow step, a sludge circulation step, and a sludge discharge step. Below, the operating method of the reactor 10 by this invention is demonstrated.

  As shown in FIG. 4A, in the sludge inflow step, the valve provided in the discharge pipe 14 is closed, the valve of the inflow pipe 13 is opened while the circulation mechanism 16 is operated, and a predetermined amount is stored in the sludge retention tank 12. The return sludge flows in.

  As shown in FIG. 4B, in the sludge circulation step, the valve of the inflow pipe 13 is closed, the circulation mechanism 16 is continuously operated in a state where the return sludge does not flow, and the return sludge is circulated in the sludge retention tank 12. Then, it is circulated and supplied to the biological treatment aid in the biological treatment aid holding unit 11. At this time, the contaminants contained in the returned sludge are captured by the filter mechanism 17 and therefore do not enter the biological treatment aid holding unit 11.

  As shown in FIG. 4C, in the sludge discharging step, the circulation mechanism 16 is stopped, the valve of the discharge pipe 14 is opened, and the return sludge is discharged from the discharge pipe 14. At this time, the foreign matter captured by the filter mechanism 17 is discharged together with the returned sludge. Note that while the return sludge is higher than the upper surface 11b of the biological treatment aid holding unit 11, the circulation mechanism 16 is not stopped, and the sludge existing above the biological treatment aid holding unit 11 is prevented from flowing backward from the upper surface 11b. May be.

  By such a step, the biological treatment aid 11d filled in the biological treatment aid holding unit 11 is eluted into the sludge, and the sludge is returned to the deep reaction vessel, so that the deep reaction vessel and the biological organisms downstream thereof can be obtained. The specific microorganism group is dominant in the treatment tank.

  As a result, the decay of sludge is suppressed, the concentration and sedimentation of the sludge in the biological treatment tank is improved, the malodor is controlled, the amount of sludge generated can be reduced, and the impurities contained in the returned sludge Blockage of the reactor 10 can be avoided.

  That is, the reactor operating method according to the present invention includes a sludge inflow step for stopping a sludge inflow after a predetermined amount of sludge has been introduced into a sludge retention tank from a water treatment facility for biologically treating organic wastewater, and a sludge inflow step. The sludge circulation step that circulates and supplies the inflowed sludge to the biological treatment aid holding unit housed in the sludge retention tank and captures impurities on the upstream side of the sludge circulation flow to the biological treatment aid holding unit, and sludge circulation And a sludge discharge step for discharging sludge from the sludge retention tank together with foreign substances captured in the step. In the sludge discharging step, it is preferable to start discharging sludge while maintaining at least the sludge circulation flow.

  In the present embodiment, as the biological treatment aid 11d, one or more of humus components and mineral lumps formed into pellets, specifically, humus, humus extract, humic acid, fulvic acid, silica sand, silica stone and the like are used. ing. When a biological treatment aid composed of such components is used, soil microorganism groups that are facultative anaerobes are dominant, and for example, soil microorganism groups such as Bacillus bacteria are dominant.

  In addition, since the reactor 10 is installed in the branch of the sludge return path as described above, the sludge is always returned from the sludge return path in parallel with the reactor 10. When it is necessary to continuously return the sludge from which the biological treatment aid is eluted to the biological treatment tank, the return sludge is placed at a position higher than the attachment position of the discharge pipe 14 and the upper surface 11b of the biological treatment aid holding part 11. The return pipe overflowed from the outflow pipe 15 is provided by providing the outflow pipe 15 for overflowing, maintaining the valve of the inflow pipe 13 in an open state, and maintaining the sludge water level in the sludge retention tank 12 at or above the height of the outflow pipe 15. Sludge can be returned to the biological treatment tank.

  That is, when the return sludge from which the biological treatment aid is eluted is continuously returned to the biological treatment tank, the operation method of the reactor according to the present invention is that the sludge flows into the sludge retention tank from the water treatment facility for biological treatment of organic wastewater. The sludge inflow step to be performed and the sludge inflow step are circulated and supplied to the biological treatment aid holding unit accommodated in the sludge retention tank and upstream of the sludge circulation flow to the biological treatment aid holding unit. A sludge circulation step for trapping impurities on the side, and a sludge outflow step for overflowing a part of the sludge circulated and supplied to the biological treatment aid holding unit from the upper part of the sludge retention tank during the execution of the sludge circulation step, A sludge discharge step that discharges sludge from the lower part of the sludge retention tank together with contaminants that are repeated at a predetermined interval during the execution of the sludge outflow step and trapped in the sludge circulation step. It is preferable to.

  According to the above configuration, the contaminants captured in the sludge retention tank are discharged together with the sludge from the lower part of the sludge retention tank in a sludge discharge step repeated at a predetermined interval. Thus, the biological treatment reactor can be stably operated for a long period of time while being returned to the biological treatment tank 12.

  The operation of the filter mechanism 17 during the operation of the reactor 10 will be described with reference to FIGS. As the sludge circulates, contaminants contained in the sludge are captured by the filter mechanism 17 disposed on the upstream side of the biological treatment assistant holding unit 11 (FIG. 5A). When the sludge circulation continues, more contaminants are captured by the filter mechanism 17 (FIG. 5B). When the return sludge is discharged by opening the valve of the discharge pipe 14, the return sludge flows through the filter mechanism 17 in the direction opposite to the circulation flow, so that the foreign matter captured by the filter mechanism 17 leaves the filter mechanism 17 ( FIG. 5 (c)) is discharged from the discharge pipe 14 together with the return sludge.

  Control of the circulation mechanism 16, the valve of the inflow pipe 13, and the valve of the discharge pipe 14 in the operation of the reactor will be described with reference to FIG. When the sludge inflow step is started at time t0, the valve of the inflow pipe 13 is opened while the valve of the discharge pipe 14 is closed, and the circulation mechanism 16 is operated.

  When a predetermined amount of sludge flows into the sludge retention tank 12 at time t1 and shifts from the sludge inflow step to the sludge circulation step, the valve of the inflow pipe 13 is closed, but the circulation mechanism 16 is continuously operated, and the sludge is retained in the sludge retention tank 12. Circulate within.

  When the sludge circulation step is completed at time t2 and the sludge discharge step is started, the valve of the discharge pipe 14 is opened to start the discharge of sludge. At this time, the circulation mechanism 16 is not stopped immediately, but is controlled so as to stop at time t3 when the sludge is discharged and the height of the sludge becomes lower than the upper surface 11b of the biological treatment assistant holding unit 11. By controlling in this way, it is possible to prevent inhalation of foreign matter into the biological treatment aid holding unit 11 by opening the valve of the discharge pipe 14. After a predetermined amount of sludge is discharged at time t4 (= t0), the valve of the discharge pipe 14 is closed, the valve of the inflow pipe 13 is opened, the circulation mechanism 16 is operated, and the sludge inflow step is started again. The sludge discharge step is repeated at a predetermined interval, and the foreign matter captured by the filter mechanism 17 is discharged from the discharge pipe 14 together with the returned sludge.

  In the above-described embodiment, the circulation mechanism 16 is operated from the start time of the sludge inflow step. However, at the start time of the sludge inflow step, the circulation mechanism 16 is stopped and any timing until the start of the sludge circulation step is reached. It may be controlled to start the operation.

  Further, the sludge is always allowed to flow into the sludge retention tank 12 without closing the valve of the inflow pipe 13 or without providing the valve, so that the sludge exceeding the capacity of the sludge retention tank 12 overflows from the outflow pipe 15. You can also In such a case, the sludge return path can be installed as a part of a single sludge return path without branching into two.

  The present invention is preferably operated so that 80% or more of the amount of sludge returned to the biological treatment tank flows into the reactor. The amount of sludge to be returned is usually 3Q to 5Q with respect to the input amount Q of the organic waste water.

In the following, another embodiment of the reactor according to the present invention is shown.
In the embodiment described above, the inflow pipe 13 is arranged so that the sludge falls from directly above the biological treatment aid holding unit 11 installed in the sludge sludge retention tank 12, but the sludge mixed with impurities is biologically treated. A guide plate is provided above the biological treatment assistant holding part 11 so that the water does not fall directly on the assistant holding part 11, and a separation region R between the inner wall surface of the sludge retention tank 12 and the side surface of the biological treatment assistant holding part 11. You may comprise so that it may guide.

  Further, as shown in FIGS. 9A to 9C, the attachment positions of the inflow pipe 13 and the outflow pipe 15 may be reversed. If comprised in this way, since the sludge which flows in from the inflow pipe 13 falls into the separation area | region R, and sludge does not fall from the biological treatment auxiliary agent holding part 11 directly, it is directly in the biological treatment auxiliary agent holding part 11. Invasion of foreign objects can be avoided.

  As shown in FIG. 7A, the outflow pipe 15 (see FIG. 4) may not be provided, and all the sludge flowing into the sludge retention tank 12 may be discharged from the discharge pipe 14.

  In addition, as shown in FIG. 7B, the inflow pipe 13 may be provided in the same surface as the discharge pipe 14 and the outflow pipe 15 in the sludge retention tank 12.

  The installation posture of the filter surface of the filter mechanism 17 is not limited to vertical, but can be provided horizontally as shown in FIG. 7C, for example. However, even in such a case, the filter mechanism 17 is disposed between the biological treatment aid holding unit 11 and the discharge pipe 14, and the trapped impurities are accompanied by the sludge when the sludge is discharged from the discharge pipe. It should be noted that it is necessary to be configured to be discharged. For example, in the case of FIG. 7C, by providing the discharge pipe 14 at a position higher than the filter mechanism 17 as compared with the other embodiments, the contaminants captured by the filter mechanism 17 when sludge is discharged are discharged together with the sludge. It is configured to be.

  As shown in FIG. 7 (d), the biological treatment aid holding unit 11 may be installed at a position separated from the two side walls of the sludge retention tank 12. In this case as well, as in the embodiment shown in FIG. 7B, when sludge flows into the empty sludge retention tank 12 from the inflow pipe 13, the sludge does not fall directly into the biological treatment aid holding unit 11, and thus the biological treatment It is possible to reduce the possibility that the upper surface 11b of the auxiliary agent holding part 11 is blocked by impurities. In this case, a filter mechanism 17 is provided below each of the side surfaces of the biological treatment aid holding unit 11 separated from the sludge retention tank 12, and a discharge pipe 14 is provided on the side wall of the sludge retention tank 12 corresponding to each of the filter mechanisms 17. It is desirable. In addition, the biological treatment aid holding unit 11 may be installed at a position separated from three or more side walls of the sludge retention tank 12. In this case, the filter mechanism 17 and the discharge pipe 14 are connected to the side wall of the sludge retention tank 12. It is desirable to provide each side surface of the biological processing aid holding part 11 that is separated.

  As shown in FIG. 8A, a rotating blade may be used as the circulation mechanism 16 instead of the air diffusion mechanism. Unlike the air diffusion mechanism, the rotary blade can generate a unidirectional flow on both sides of the installation position. Therefore, the circulation mechanism 16 is installed above the biological treatment aid holding unit 11 as shown in FIG. Even in this case, an upward flow can be generated in the biological treatment aid holding unit 11. Further, in this case, it may be configured not to stop the rotor blades when the sludge is discharged by opening the valve of the discharge pipe 14, but to reversely rotate to generate a downward flow and promote the discharge of the sludge. .

  In addition to punching metal, mesh, grating, non-woven fabric, or the like may be used as the bottom surface 11a and the top surface 11b of the filter mechanism 17 and the biological treatment aid holding unit 11. In short, sludge is allowed to flow while trapping impurities. It can be anything if possible. Furthermore, the filter mechanism 17, the bottom surface 11a, and the top surface 11b do not need to be unified with the same type of member.

  Note that it is difficult to completely remove the contaminants in the sludge by the filter mechanism 17, and it is assumed that there are contaminants flowing into the biological treatment aid holding unit 11. If such contaminants are trapped on the sludge flow surface such as the bottom surface 11a of the biological treatment aid holding unit 11, the sludge flow surface may be clogged or the equipment may be damaged as described above. It is preferable that the filter mechanism 17 is configured so as to make it difficult to capture impurities.

  For example, when the filter mechanism 17 and the sludge flow surface are both made of punching metal, the size of the hole formed in the filter mechanism 17 is smaller than the size of the hole of the sludge flow surface and is formed in the filter mechanism 17. If the density of the formed holes is larger than the density of the holes on the sludge flow surface, the possibility that impurities that have not been captured by the filter mechanism 17 will be captured on the sludge flow surface is reduced.

  The material constituting the filter mechanism 17 is not limited to SUS304 as long as it has corrosion resistance, and may be another metal material having corrosion resistance such as SUS316, a resin material such as FRP, or a ceramic material. .

  Further, it is preferable to fix the filter mechanism 17 by means that can be removed and attached, such as screwing, because it can be easily replaced when the sludge is discharged for maintenance or the like. Since the filter mechanism 17 does not have a function of supporting the biological treatment aid 11d, there is no problem that the biological treatment aid 11d falls even if it is temporarily removed at the time of replacement.

  Any valve may be used as an opening / closing mechanism provided in the inflow pipe 13 and the discharge pipe 14 as long as it can block the flow of sludge when closed. For example, a solenoid valve, an electric valve, a pneumatic valve, a manual valve, etc. It can be used suitably. Further, the types of valves provided in the inflow pipe 13 and the exhaust pipe 14 do not necessarily need to be matched. Further, a pump can be adopted as the opening / closing mechanism, and the pump can suck or discharge sludge, or can stop the suction or discharge of sludge.

  In the above-described embodiment, the outflow pipe 15 is provided at a position higher than the attachment position of the discharge pipe 14 and the upper surface 11b of the biological treatment assistant holding unit 11, and the sludge outflow step for overflowing sludge is performed. As shown in FIG. 10, an outflow pipe 15 is provided together with a valve at a position lower than the upper surface 11b of the biological treatment assistant holding unit 11, and a sludge outflow step is performed in which the valve is opened and sludge flows out at a predetermined timing. It may be configured.

  In the above-described embodiment, when shifting from the sludge circulation step to the sludge discharge step, the sludge is discharged after the circulation mechanism 16 opens the valve of the discharge pipe 14, and the height of the sludge is the upper surface 11b of the biological treatment aid holding unit 11. Although it was stopped when it became lower, it is not limited to such timing. For example, when the circulation mechanism 16 is an aeration mechanism, the circulation mechanism 16 is operated at a water level as shown in FIG. As shown in FIG. 4 (d) without stopping, if the sludge is stopped after the water level of the sludge is lower than the air diffusion holes on the upper surface, the possibility of sludge clogging the air diffusion holes can be avoided. Or you may make it stop, after discharging all the sludge in the sludge retention tank 12. FIG.

  In the above-described embodiment, the reactor according to the present invention is installed in a water treatment facility having a deep reaction tank, a nitrification tank, a denitrification tank, and a re-aeration tank. The reactor according to the present invention can be installed regardless of the above-described embodiment if there is a sludge return route for returning a part of the sample to the biological treatment tank. Moreover, the treatment target in the water treatment facility is not limited to urine and septic tank sludge as long as it is organic wastewater, and can also be applied to water treatment facilities for treating wastewater such as food factories.

  In the embodiment described above, the reactor 10 is installed in the branch of the sludge return path, and a part of the sludge is returned to the biological treatment tank without passing through the reactor 10, but the sludge return path is not branched and the entire amount is returned. You may comprise so that sludge may pass through a reactor.

  The above-described embodiment is one aspect of the present invention, and the present invention is not limited by the description. Specific configurations and control aspects of each part can be appropriately changed and designed within the scope of the effects of the present invention. Needless to say.

10: Reactor 11: Biological treatment assistant holding part 12: Sludge retention tank 13: Inflow part (inflow pipe)
14: Discharge part (discharge pipe)
15: Outflow part (outflow pipe)
16: Circulation mechanism 17: Filter mechanism R: Separation region

Claims (12)

  A biological treatment assistant holding part filled with a biological treatment assistant that predominates a specific microorganism group in sludge, a sludge retention tank in which the biological treatment assistant holding part is accommodated, and a sludge return route of water treatment equipment An inflow part for receiving the sludge in the sludge retention tank, a discharge part for returning the received sludge to the water treatment facility, and the sludge flowing in from the inflow part in the biological treatment aid holding part in the sludge retention tank A circulation mechanism that circulates and captures contaminants from the sludge that is circulated and supplied to the biological treatment aid holding unit by the circulation mechanism, and the captured contaminants are converted into sludge when the sludge is discharged from the discharge unit. A biological treatment reactor comprising: a filter mechanism arranged to be discharged together.   The biological treatment assistant holding part is provided with a storage part for storing the biological treatment assistant, and a pair of sludge flow surfaces for holding the biological treatment assistant stored in the storage part and allowing the sludge to flow therethrough, 2. The biological treatment according to claim 1, wherein sludge is configured to circulate in the housing portion via the sludge flow surface, and the filter mechanism is disposed upstream of the sludge flow surface on the sludge inflow side. Reactor.   Three side surfaces of the biological treatment aid holding part formed in a rectangular shape in plan view come into contact with the inner wall surfaces of the sludge retention tank and the other one side surface is separated from the other inner wall surface of the sludge retention tank. The sludge circulating in the sludge retention tank and flowing through the pair of sludge flow surfaces flows through the separation area between the inner wall surface of the sludge retention tank and the side surface of the biological treatment aid holding part. The biological treatment reactor according to claim 2, which is formed.   The discharge unit is provided with an opening / closing mechanism, and the filter mechanism captures contaminants from the sludge circulation flow to the biological treatment aid holding unit when the discharge unit is closed, and the captured contaminants open the discharge unit. The biological treatment agent according to any one of claims 1 to 3, wherein the biological treatment aid holding part and the discharge part are arranged so as to be discharged together with the sludge flowing out to the discharge part. reactor.   The biological treatment reactor according to any one of claims 1 to 4, wherein the discharge section is configured to be opened at least when the circulation mechanism is operating.   The biological treatment reactor according to any one of claims 1 to 5, wherein the circulation mechanism includes an aeration mechanism that generates an upward flow in sludge and guides the sludge to the biological treatment assistant holding unit.   The biological sludge retention tank according to any one of claims 1 to 6, wherein the sludge retention tank is provided with an outflow section for allowing the sludge to flow out at a position higher than an upper position of the biological treatment assistant holding section and an installation position of the discharge section. reactor.   The biological treatment reactor according to any one of claims 1 to 7, wherein the filter mechanism is made of a corrosion-resistant metal material, a resin material, or a ceramic material. Pretreatment equipment for removing solid foreign substances from organic waste water, single or plural biological treatment tanks for biological treatment of organic waste water from which solid foreign substances have been removed by the pretreatment equipment, and biological treatment in the biological treatment tank A water treatment facility equipped with a solid-liquid separation tank for solid-liquid separation of the organic wastewater,
A water treatment facility in which the biological treatment reactor according to any one of claims 1 to 8 is incorporated in a sludge return path for returning a part of the sludge extracted from the water treatment facility to the water treatment facility. A method for operating a biological treatment reactor in which sludge is brought into contact with a biological treatment aid to predominate a specific microorganism group,
A sludge inflow step for stopping the inflow of sludge after flowing a predetermined amount of sludge from a water treatment facility for biologically treating organic wastewater into a sludge retention tank;
The sludge that has flowed in in the sludge inflow step is circulated and supplied to the biological treatment assistant holding part accommodated in the sludge retention tank, and impurities are captured upstream of the sludge circulation flow to the biological treatment aid holding part. Sludge circulation step,
Sludge discharging step for discharging sludge together with the contaminants captured in the sludge circulation step from the sludge retention tank;
Of operating a biological treatment reactor comprising: A method for operating a biological treatment reactor in which sludge is brought into contact with a biological treatment aid to predominate a specific microorganism group,
A sludge inflow step for flowing sludge into a sludge retention tank from a water treatment facility for biologically treating organic wastewater;
During execution of the sludge inflow step, the sludge that has flowed in is circulated and supplied to the biological treatment aid holding part accommodated in the sludge retention tank, and is contaminated upstream of the sludge circulation flow to the biological treatment aid holding part. A sludge circulation step to catch things,
During the execution of the sludge circulation step, a sludge outflow step for causing a part of the sludge circulated and supplied to the biological treatment aid holding unit to flow out from the sludge retention tank;
Sludge discharging step for discharging sludge from the lower part of the sludge retention tank together with the contaminants captured in the sludge circulation step for a predetermined time during execution of the sludge outflow step;
Of operating a biological treatment reactor comprising:   The operation method of the biological treatment reactor according to claim 10 or 11, wherein the sludge discharge step starts discharging sludge in a state where at least the sludge circulation flow is maintained.

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