JP6505545B2 - Reactor for biological treatment, operation method of biological reactor, and water treatment equipment - Google Patents

Description

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

  Wastewater such as human waste and septic tank sludge carried into a water treatment facility for biological treatment of organic wastewater is temporarily stored in a storage tank after being pretreated to remove unsuited materials such as wastes and debris mixed in with waste water. Water from the storage tank to the biological treatment tank quantitatively. The biological treatment treated water is solid-liquid separated, the liquid component is discharged to rivers etc after advanced treatment such as activated carbon filtration, and the solid component is dewatered by filter press dehydrator etc and then incinerated etc. Ru.

  In such conventional water treatment equipment, there is a problem that a great deal of cost and equipment are required for the measures against the offensive odor generated in the process of biological treatment and the treatment of excess sludge.

  Therefore, the inventors of the present invention make the specific microflora dominant in the sludge and improve the sewage treatment capacity by supplying the biological treatment aid to the treatment tank of the water treatment apparatus adopting the activated sludge method. The technology is being researched and developed, and it is expected that the biological treatment with such microflora will reduce the generation of offensive odor and reduce the amount of excess sludge generated.

  Patent Document 1 discloses a microorganism metabolic circuit inducing material containing humic substances and substances having an oresite or rhyolitic composition in an activated or unstable state as an example of a biological treatment aid. A simple apparatus for producing seed sludge is disclosed, which manifests the phenolic metabolic function of the soil bacteria group by supplying the soil bacteria group in the medium.

  The simplified production system of the seed sludge is an aeration nozzle installed under the container by immersing a container filled with a microorganism metabolism circuit induction material and whose top and bottom surfaces are made of wire mesh or punching metal inside the biological treatment tank. It is an apparatus which elutes a biological treatment auxiliary into treated water by generating air from the aeration, generating an upward flow in the container and letting the treated water flow.

Japanese Examined Patent Publication 5-10999

  However, in the water treatment equipment for biological treatment of 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 offensive odor, etc. Since only a small lid is provided, it is possible to immerse or maintain a container of a certain size filled with a biological treatment aid as described in Patent Document 1 in such a treatment tank. There is a problem that it is difficult to put in and out, and a large-scale modification of the treatment tank is required.

  In addition, as described above, contaminants in the sewage are removed by the pretreatment facility, but some of them are not removed and flow into each treatment tank, so the sewage water outlet such as wire mesh or punching metal Contaminants may be entangled and clogged, which may prevent smooth elution of the biological treatment aid, and there is also a risk that the wire mesh or punching metal may be corroded by corrosive substances such as hydrogen sulfide generated in the biological treatment process. It was difficult to immerse in the treatment tank for a long time.

In view of the above-described problems, the object of the present invention is to provide a water treatment facility for treating organic wastewater such as human waste and septic tank sludge, which is not provided with a large opening in the treatment tank, and can be easily installed over a long period of time Another object of the present invention is to provide a biological treatment reactor, a method of operating a biological treatment reactor, and a water treatment facility, which prevent the biological treatment aid storage unit from being clogged by contaminants without maintenance.

In order to achieve the above-mentioned object, the first characterizing feature of the biological treatment reactor according to the present invention is, as described in claim 1 of the claimed document, an organism which predominates a specific microorganism group in sludge. A biological treatment auxiliary holding unit filled with a treatment auxiliary; a sludge retention tank containing the biological treatment auxiliary holding unit; a sludge input tank for receiving activated sludge from a water treatment facility and leading it to the sludge retention tank; A filter mechanism installed in the sludge input tank for capturing contaminants entrained in the activated sludge; a sludge discharge unit returning activated sludge in contact with a biological treatment aid in the sludge retention tank to the water treatment facility; , Bei give a, activated sludge which has flowed into the sludge charging tank is that a partition wall for partitioning the said sludge retention tank and the sludge charging tank to overflow and is configured to be guided to the sludge retention tank .

  According to the above-mentioned configuration, while the activated sludge led from the sludge feeding tank to the sludge retention tank stays in the tank, the activated sludge comes in contact with the assistant of the biological treatment assistant holding unit to elute the biological treatment assistant, Such activated sludge is discharged from the discharge unit and returned to the water treatment facility, and the specific microorganism group contained in the activated sludge becomes dominant in the sludge retention tank and / or the water treatment facility. Since the activated sludge after the removal of contaminants is returned to the water treatment facility, it is not necessary to provide, for example, a large filter mechanism in the sludge retention tank, the structure of the entire apparatus is simplified, and the activated sludge Even in the case of circulating to the sludge input tank via the treatment tank, clogging of the biological treatment auxiliary holding unit is reduced.

  In addition, since the activated sludge in which contaminants are captured by the filter mechanism is led to the sludge retention tank, the biological treatment aid holding portion is not clogged with contaminants, and the circulating flow rate in the sludge retention tank is reduced. Is prevented, and the contact efficiency between the biological treatment agent and the activated sludge is maintained.

Furthermore, since the sludge overflows the dividing wall that divides the sludge charging tank and the sludge retention tank, there is no need to provide a special configuration for leading activated sludge that has flowed into the sludge charging tank to the sludge retention tank. Even in the case of cleaning, only the sludge charging tank partitioned by the partition walls can be the cleaning target, and the cleaning operation is also extremely easy.

According to the second aspect of the present invention, as described in the second aspect, a biological treatment auxiliary holding unit filled with a biological treatment auxiliary for making specific microorganisms in the sludge dominant, and the biological treatment auxiliary holding And a sludge input tank for receiving activated sludge from a water treatment facility and guiding the activated sludge to the sludge storage tank, and a filter installed in the sludge input tank for trapping contaminants entrained in the activated sludge And a sludge discharge unit for returning the activated sludge in contact with the biological treatment aid in the sludge retention tank to the water treatment facility, and the activated sludge received in the sludge input tank is directed upward from below After passing through the filter mechanism, it is configured to be led to the sludge retention tank, and an inflow portion of activated sludge is provided upstream of the filter mechanism.

According to the above-mentioned configuration, while the activated sludge led from the sludge feeding tank to the sludge retention tank stays in the tank, the activated sludge comes in contact with the assistant of the biological treatment assistant holding unit to elute the biological treatment assistant, Such activated sludge is discharged from the discharge unit and returned to the water treatment facility, and the specific microorganism group contained in the activated sludge becomes dominant in the sludge retention tank and / or the water treatment facility. Since the activated sludge after the removal of contaminants is returned to the water treatment facility, it is not necessary to provide, for example, a large filter mechanism in the sludge retention tank, the structure of the entire apparatus is simplified, and the activated sludge Even in the case of circulating to the sludge input tank via the treatment tank, clogging of the biological treatment auxiliary holding unit is reduced.

In addition, since the activated sludge in which contaminants are captured by the filter mechanism is led to the sludge retention tank, the biological treatment aid holding portion is not clogged with contaminants, and the circulating flow rate in the sludge retention tank is reduced. Is prevented, and the contact efficiency between the biological treatment agent and the activated sludge is maintained.

Furthermore, when the activated sludge that has flowed into the sludge input tank from the inflow section passes through the filter mechanism, the passage of contaminants entrained in the activated sludge is impeded, so that the biological treatment aid retention unit by contaminants in the sludge retention tank There will be no problems such as clogging. In addition, since the activated sludge passes from the lower side to the upper side and passes through the filter mechanism, the sludge entrained in the activated sludge floats in the activated sludge in the lower portion of the filter mechanism without being strongly entangled in the filter mechanism even if captured by the filter mechanism. be as it, the degree of clogging of the filter mechanism also Ru is reduced.

According to the first feature of the method for operating a biological treatment reactor according to the present invention, as described in claim 3 , activated sludge is introduced into a sludge input tank provided with a filter mechanism, and the activated sludge passed through the filter mechanism. Were introduced into a sludge retention tank filled with a biological treatment aid that overflows the partition wall partitioned with the sludge input tank to make the specific microorganism group dominant, and brought into contact with the biological treatment aid in the tank The biological treatment aid contacting step to be taken out later, and the washing step for interrupting the feeding of activated sludge to the sludge feeding tank, discharging the activated sludge fed to the sludge feeding tank and washing the filter mechanism The point is to operate so as to repeat the biological treatment aid contacting step and the cleaning step.

In the cleaning step, since the activated activated sludge that has been introduced may be discharged to clean the filter mechanism only for the sludge input tank separated by the partition walls from the sludge retention tank, a very easy cleaning step can be realized. This makes it possible to return to the rapid biological treatment aid contacting step.

According to a second feature of the method of operating a biological treatment reactor according to the present invention, as described in claim 4, activated sludge is introduced into a sludge input tank provided with a filter mechanism, and from below in the sludge input tank The activated sludge that has passed through the filter mechanism upward is led to a sludge retention tank filled with a biological treatment aid that makes the specific microorganism group dominant, and removed after being brought into contact with the biological treatment aid in the tank The biological treatment aid contacting step, and the washing step for interrupting the charging of activated sludge to the sludge charging tank, discharging the activated sludge charged to the sludge charging tank and washing the filter mechanism, The biological treatment aid contacting step and the washing step are repeated.

In the cleaning process, if the activated sludge is discharged only to the sludge charging tank different from the sludge retention tank, the filter mechanism is cleaned by the activated sludge passing from the upper side to the lower side, which is extremely easy. The cleaning process can be realized. This makes it possible to return to the rapid biological treatment aid contacting step.

According to the first feature of the water treatment facility according to the present invention, as described in claim 5 , a receiving tank for receiving organic wastewater and a pretreatment facility for removing solid foreign matter from the organic wastewater received in the receiving tank. And one or more biological treatment tanks for biological treatment of organic wastewater from which solid foreign matter has been removed in the pretreatment facility, and solid-liquid separation for solid-liquid separation of organic wastewater biologically treated in the biological treatment tank. Water treatment equipment comprising the equipment, the first or second characteristic configuration described above in the sludge return path for returning a part of the sludge separated in the solid-liquid separation equipment to the biological treatment tank The point is that a biological treatment reactor equipped with

  Even if it is the water treatment equipment which processes organic drainage, such as human waste and septic tank sludge, it becomes easy to install now which does not equip the treatment tank with a large opening.

According to the second aspect of the present invention, as described in claim 6 , the receiving tank for receiving the organic drainage, the receiving tank for receiving the organic drainage, and the solid foreign matter removed from the organic drainage received in the receiving tank Solid-liquid separation of organic wastewater subjected to biological treatment in the biological treatment tank, one or more biological treatment tanks for biological treatment of organic wastewater from which solid foreign matter has been removed by the pretreatment equipment, and treatment equipment A water separation facility configured to include a liquid separation facility, wherein the sludge return path for returning the sludge extracted from the biological treatment tank to the biological treatment tank is provided with the first or second characteristic configuration described above Another point is that the biological treatment reactor is incorporated.

  Even if it is the water treatment equipment which processes organic drainage, such as human waste and septic tank sludge, it becomes easy to install now which does not equip the treatment tank with a large opening. Furthermore, when the biological treatment reactor is provided in the sludge return path for returning sludge extracted from the biological treatment tank to the biological treatment tank, even if the amount of return of activated sludge withdrawn from the water treatment facility fluctuates, activity via the reactor The sludge can be circulated and supplied to the biological treatment tank in a stable amount.

As described above, according to the present invention, even a water treatment facility for treating organic wastewater such as human waste and septic tank sludge, which does not have a large opening in the treatment tank, can be easily installed, and maintenance can be performed for a long time It has become possible to provide a biological treatment reactor, a method of operating a biological treatment reactor, and a water treatment facility, which can prevent the biological treatment auxiliary agent storage unit from being blocked by foreign substances without it.

Functional block diagram of water treatment equipment in which the reactor for biological treatment according to the present invention is installed (A) is a front view of a biological treatment reactor, (b) is a plan view of the same, (c) is a cross-sectional view taken along the line B-B of (a) CC sectional view taken on the line of FIG.2 (b) (A) is a right side view of the biological treatment reactor, (b) is the same left side view (A) is the sectional view on the AA line of FIG. 2 (a), (b) explanatory drawing of the washing | cleaning state of the filter by a nozzle Piping diagram of reactor for biological treatment (A), (b) shows the front view of the reactor for biological treatment which shows another embodiment. Functional block diagram showing another embodiment of the water treatment facility in which the biological treatment reactor according to the present invention is installed

  Hereinafter, the biological treatment reactor, the operation method of the biological treatment reactor, and the water treatment equipment according to the present invention will be described.

  As shown in FIG. 1, in the water treatment facility where the biological treatment reactor 1 (hereinafter simply referred to as "reactor") is installed, organic waste water such as human waste and septic tank sludge carried in by human waste collection vehicles etc. First, it is put into the receiving tank, then it is suitable for biological treatment in the pretreatment facility equipped with a screen mechanism etc. and solid foreign matter such as residue is removed and then the organic waste water stored in the storage tank is denitrification tank, nitrification The biological treatment is performed in a biological treatment tank such as a tank, and after being withdrawn from the membrane separation apparatus, the advanced treatment apparatus is discharged to a river or the like.

  The membrane concentrate is transferred from the membrane separation apparatus to the return sludge tank, and part of the activated sludge discharged to the return sludge tank is returned to the biological treatment tank via the sludge return path, and excess sludge is filled in the sludge purification tank. The solid content is carried out of the site after being transferred to a sludge storage tank and subjected to solid-liquid separation processing in a dewatering facility, and the liquid content is circulated and supplied to the biological treatment tank through a filtrate storage tank.

  The nitrification tank is maintained in an aerobic state by the aeration apparatus, and aerobic microorganisms decompose ammonia into nitrification, that is, nitrate ions. The organic wastewater subjected to aerobic treatment in the nitrification tank is subjected to solid-liquid separation by a membrane separation device, and a membrane-permeated liquid is supplied to the above-mentioned advanced treatment equipment. A portion of the organic wastewater and sludge treated aerobically in the nitrification tank is transferred to the denitrification tank and reduced from nitrate ion to nitrogen.

  The biological treatment system is not limited to such a configuration, and may be configured to further include an anoxic tank for removing phosphorus, or may be a single tank system that performs nitrification and denitrification batchwise. Or aerobic digestion without denitrification treatment.

  The reactor 1 according to the present invention is installed in such a water treatment facility at a branch of a sludge return path for returning activated sludge from the return sludge tank to the denitrification tank. That is, a part of the return sludge to be returned to the biological treatment tank from the sludge return path is configured to be returned to the biological treatment tank after passing through the reactor provided in the branch as activated sludge.

  As shown in FIG. 2 to FIG. 4, the reactor 1 includes a biological treatment auxiliary holding unit 2 filled with a biological treatment auxiliary for making specific microorganisms in the sludge dominant, and a biological treatment auxiliary holding unit 2. Sludge retention tank 3 accommodated, Sludge input tank 4 which receives activated sludge from water treatment equipment and leads it to the sludge retention tank, Filter mechanism 5 which is installed in sludge input tank 4 and captures contaminants carried by activated sludge And the sludge discharge part 6 grade | etc., Which returns the sludge dominantly converted by the sludge retention tank 4 to a water treatment installation.

  The sludge retention tank 3 and the sludge feeding tank 4 are made of a corrosion resistant material, and on the upper part thereof, lids 3A and 4A for inspection are provided.

  The biological treatment aid holding unit 2 is formed of a container 2 A whose upper and lower surfaces are separated by punching metal so that the sludge flows in the biological treatment aid, and whose side is separated by a flat plate. It is attached to the middle part.

  As a biological treatment aid to be filled in the biological treatment aid holding part 2, it is a kind of humic component or mineral lump shaped into a pellet shape, more specifically humus, humus extract, humic acid, fulvic acid, silica sand, silica stone etc. Or multiple types are used. When the sludge comes in contact with a biological treatment aid composed of such a component, the soil microorganism group which is a facultative anaerobe is dominated, and for example, the soil microorganism group such as Bacillus bacteria is dominated.

  In the lower part of the biological treatment auxiliary holding unit 2, the sludge led to the sludge retention tank 3 is circulatingly supplied to the biological treatment auxiliary holding unit 2 in the tank to secure the contact opportunity with the biological treatment auxiliary A circulation mechanism 7 is provided.

  When the sludge is circulated and supplied to the biological treatment auxiliary holding unit 2 by the circulation mechanism 7, the frequency of contact with the biological treatment auxiliary is increased, and the biological treatment auxiliary is efficiently eluted. When such sludge is returned to the water treatment facility, it becomes effective to predominate the specific microorganism group.

  The circulation mechanism 7 is configured of an aeration mechanism that causes the sludge in the sludge retention tank 3 to generate an upward flow and leads it to the biological treatment aid holding unit 2. Due to the aeration supplied from the two aeration nozzles arranged below the biological treatment auxiliary holding unit 2, an upward flow is generated in the sludge from the lower side to the upper side of the biological treatment auxiliary holding unit 2. This upward flow forms a circulating flow in which the sludge flows from the lower side to the upper side of the biological treatment auxiliary agent holding unit 2.

  As a circulation mechanism other than the aeration mechanism, a stirring device such as a rotor that causes an upward flow in the biological treatment auxiliary agent holding unit 2 may be used.

  The sludge discharge unit 6 is disposed at a position higher than the upper surface of the biological treatment auxiliary holding unit 3. Since the sludge water level of the sludge retention tank is maintained above the upper surface of the biological treatment aid holding unit, the sludge can be stably circulated to the biological treatment aid holding unit 2 and the sludge in which the biological treatment aid is eluted Can be discharged from the sludge discharge unit 6 and returned to the biological treatment tank of the water treatment facility.

  The sludge supplied from the branch of the sludge return path flows into the sludge retention tank 3 via the sludge feeding tank 4, and after contact with the biological treatment aid in the sludge retention tank 3, overflows from the sludge discharge unit 6 It is supplied to the biological treatment tank.

  A cleaning nozzle 9 for removing dirt of the punching metal, which becomes the biological treatment aid holding unit 2 when replacing the filler, is provided at the lower part of the biological treatment aid holding unit 2. A drain port 11 is formed in the vicinity of the bottom of the sludge retention tank 3 for such maintenance.

  Contaminants that are not sufficiently removed in the pretreatment tank are entrained in the sludge flowing into the sludge input tank 4 from the sludge return path, and the biological treatment aid holding unit 2 is configured when circulating in the sludge retention tank 3 Contamination may be caught in the opening of the punching metal to block the opening.

  Therefore, a filter mechanism 5 is provided in the sludge feeding tank 4 so as to capture foreign matter entrained in the activated sludge.

  According to such a configuration, the sludge overflowed from the sludge feeding tank 4 to the sludge retention tank 3 contacts the assistant in the biological treatment assistant holding unit 2 while staying in the sludge residence tank 3 and the biological treatment assistant Agent elutes, and such sludge is discharged from the discharge unit 6 and returned to the water treatment facility, and the specific microorganism group contained in the sludge is dominant in the sludge retention tank 3 and / or the water treatment facility become.

Assuming that the amount of sewage flowing into the biological treatment tank is Q, the amount of sludge flowing into the filter mechanism 5 is preferably set to 0.5 Q to 3.0 Q m ³ / day, and 1.0 Q to 2.0 Q m ³ It is more preferable to set at / day.

  Since the sludge captured by the filter mechanism 5 spills contaminants into the sludge retention tank 3, the biological treatment aid holding unit 2 is not clogged with contaminants and is captured by the filter mechanism 5. Contaminants can be removed at the time of maintenance such as washing on the side of the sludge feeding tank 4, so maintenance work is also reduced.

  Since the activated sludge which has flowed into the sludge feeding tank 4 is configured to be supplied to the area where the activated sludge descends by the circulation mechanism 7, it circulates quickly without disturbing the circulation flow.

  The sludge received in the sludge feeding tank 4 flows upward from below and passes through the filter mechanism 5, and then flows into the sludge retention tank 3 by overflowing the partition 3 B that divides the sludge loading tank 4 and the sludge retention tank 3 As described above, a sludge inflow portion 4B is provided below the filter mechanism 5.

  The sludge flowing from the inflow portion 4B into the sludge charging tank 4 passes through the filter mechanism 5 and overflows the partition 3B and is led to the sludge retention tank 3. Therefore, contaminants entrained in the sludge are captured by the filter mechanism 5 Only the sludge that has accumulated below the sludge feeding tank 4 and has passed through the filter mechanism 5 is led to the sludge retention tank 3 by overflowing the partition wall 3B.

  That is, since the sludge feeding tank 4 can be configured only to remove contaminants accompanying the sludge, the filter mechanism for removing the contaminants from the sludge circulating toward the biological treatment aid holding unit 2 in the sludge retention tank 3 It is possible to configure the sludge feeding tank 4 in a simple and compact manner while securing extremely good maintainability as compared with providing the sludge retention tank 3 with the above.

  The filter mechanism 5 is made of punching metal, and the opening diameter is preferably φ3 mm to φ15 mm. The material is made of a corrosion resistant metal material, a resin material or a ceramic material. Even if the sludge contains a corrosive substance, corrosion of the filter mechanism 5 can be avoided for a long time. The filter mechanism 5 may be made of mesh, wedge wire or the like in addition to punching metal. The opening of the filter mechanism 5 is set to a value smaller than the opening diameter of the punching metal that constitutes the biological treatment auxiliary agent holding unit 2.

  In preparation for such clogging of the filter mechanism 5, cleaning nozzles 8A and 8B are installed on both the upstream side and the downstream side of the filter mechanism 5 along the sludge flow direction. The cleaning liquid jetted from the upper cleaning nozzle 8A on the downstream side passes through the filter mechanism 5, and the contaminants trapped on the upstream side separate from the filter mechanism 5 and fall downward, so that the subsequent processing is facilitated. Become.

  The cleaning liquid jetted from the lower cleaning nozzle 8B is directly jetted and supplied to the contaminants captured on the lower surface side of the filter mechanism, so it easily separates from the filter mechanism 5 and falls downward.

  It is preferable that the filter mechanism 5 be configured such that the jetting direction of the washing liquid jetted from the upper washing nozzle 8A and the jetting direction of the washing liquid jetted from the lower washing nozzle 8B cross each other.

  Even when foreign substances are stuck to the filter mechanism 5, the jetting direction of the washing liquid jetted from the upper washing nozzle 8A and the jetting direction of the washing liquid jetted from the lower washing nozzle 8B are the same locations of the filter mechanism 5. As a result, a stronger shear force is exerted, and contaminants can be effectively separated from the filter mechanism 5.

  Specifically, as shown in FIGS. 4 (a), 5 (a) and 5 (b), four jet parts are formed on the upper cleaning nozzle 8A, and three jet parts are formed on the lower cleaning nozzle 8B. Are formed and arranged such that they are staggered. The sprays are configured to spray the cleaning solution in a conical shape with an apex angle of about 90 ° from each spray unit, and the spray directions of the upper and lower cleaning solutions are configured to intersect at an angle.

  The filter mechanism 5 is attached to the sludge receiving tank 4 in an inclined posture in which the filter mechanism 5 is inclined downward from the partition side 3B to the opposite partition side separated from the partition 3B. The cleaning liquid jetted from the lower cleaning nozzle 8B and passing through the filter mechanism 5 flies in the direction separating from the partition 3B, and therefore does not flow into the sludge retention tank 3 through the partition. Moreover, the width of the sludge feeding tank 4 can be configured to be narrow while increasing the filter effective area of the filter mechanism 5.

  In addition, in case the cleaning nozzle 8A, 8B can not sufficiently wash, opening the cover 4A for inspection and removing the screw fixing the filter mechanism 5 to the sludge receiving tank 4, the filter mechanism 5 It is configured to be taken out and cleaned.

  As shown in FIG. 6, a valve V2 is provided in the return sludge pipe to the inflow portion 4B of the sludge feeding tank 4, and a valve V3 is also provided in the drain pipe for draining sludge from the sludge part 4C of the sludge feeding tank 4 to the receiving tank. Is provided. By switching the valves V2 and V3 complementarily, a switching mechanism 4D that switches the inflow and the outflow of the mud is configured.

  During normal operation, the valves V1, V3 and V6 are closed and the valves V2 and V5 are opened, whereby the return sludge flows from the inflow section 4B into the sludge input tank 4 and circulated in the sludge retention tank 3 by aeration. Is generated.

  When cleaning the filter mechanism 5, the valve V2 is closed and the valve V3 is opened to discharge the sludge of the sludge feeding tank 4 from the sludge part 4C to the receiving tank, and then the valve V1 is opened to wash the washing water Supply to mechanisms 8A and 8B.

  When the cleaning is completed, the valves V1 and V3 are closed and the valve V2 is opened. Sludge flows into the sludge input tank 4. During cleaning, the valve V5 may be open or closed.

  When refilling the biological treatment aid, close the valve V2 to stop fresh inflow sludge and open the valve V4 of the drain port to discharge the sludge in the sludge retention tank 3 to the biological treatment tank, here the nitrogen removal tank Thereafter, the valve V6 is opened to wash the punching metal of the biological treatment auxiliary holding unit with the washing nozzle 9.

  That is, activated sludge is introduced into a sludge input tank equipped with a filter mechanism, and the activated sludge that has passed through the filter mechanism is led to a sludge retention tank filled with a biological treatment aid that makes the specific microorganism group dominant. The biological treatment aid contacting step to be taken out after being brought into contact with the biological treatment aid internally, and the charging of activated sludge to the sludge charging tank are interrupted, and the activated sludge charged to the sludge charging tank is discharged and the filter And a washing step of washing the mechanism, and the operation method of the biological treatment reactor is operated to repeat the biological treatment aid contacting step and the washing step.

Another embodiment will be described below.
In the embodiment described above, an example is described in which the filter mechanism 5 is attached to the sludge receiving tank 4 in an inclined posture in which the filter mechanism 5 inclines downward from the partition side 3A to the non-partition wall side. It may be attached or it may be attached in the vertical posture. What is necessary is just to comprise so that sludge may overflow from the partition 3B, after removing a foreign material from the sludge which flows in from the inflow part 4B.

  FIG. 7 (a) shows a sludge feeding tank 4 which is divided into right and left portions by a partition 40 whose bottom is opened, and a siphon-like structure is adopted. The sludge flowing from the inflow portion 4B formed in the upper portion of the side wall flows into the flow passage on the sludge retention tank 3 side through the open portion of the bottom, and overflows in the sludge retention tank 3 after passing through the filter mechanism 5 disposed in the flow passage. It is configured to flow. Also in this case, switching is performed by the switching mechanism 4D described above.

  As shown in FIG. 7 (b), after the sludge flowing into the sludge feeding tank 4 passes through the filter mechanism 5, it is configured not to overflow the partition 3 B but to flow into the sludge retention tank 3 from above. It may be

  Alternatively, the activated sludge received in the sludge feeding tank 4 may be configured to be led to the sludge retention tank 3 after passing through the filter mechanism 4 from the upper side to the lower side.

  In the embodiment described above, in order to configure the filter mechanism 5 so that the jet direction of the cleaning liquid jetted from the upper cleaning nozzle 8A and the jet direction of the cleaning liquid jetted from the lower cleaning nozzle 8B cross each other, Although the example in which the portions are alternately arranged has been described, the nozzles may be configured such that the ejection directions of the cleaning liquid are different even if the ejection portions of both nozzles are disposed to face each other.

  In the embodiment described above, the configuration provided with both the upper cleaning nozzle 8A and the lower cleaning nozzle has been described. However, only one of the upper cleaning nozzle 8A and the lower cleaning nozzle may be provided.

  Although the embodiment described above describes an example in which the reactor is provided in the sludge return path for returning a part of the sludge separated in the solid-liquid separation facility to the water treatment facility, the sludge extracted from the biological treatment tank is You may provide in the sludge return path returned to a biological treatment tank.

  As shown in FIG. 8, for example, a reactor may be provided in a sludge return path where sludge is returned from the nitrification tank to the denitrification tank for denitrification treatment. If a biological treatment reactor is provided in the sludge return path for returning the sludge extracted from the water treatment tank to the biological treatment tank, the biological treatment tank with a stable amount of sludge passing through the reactor even if there is a restriction on the amount of return sludge. It can be supplied to the

  Then, by returning the sludge that has passed through the reactor to the water treatment facility, the volume reduction rate due to the autolysis of the sludge in the sludge conditioning tank can be significantly improved.

  The above-described embodiment is an aspect of the present invention, and the present invention is not limited by the description, and the specific configuration and control mode of each part can be appropriately modified and designed within the range where the effects of the present invention can be exhibited. It goes without saying that

1: Reactor for biological treatment 2: Biological treatment auxiliary holding unit 3: Sludge retention tank 3B: Partition wall 4: Sludge input tank 5: Filter mechanism 6: Sludge discharge part 8A, 8B: Washing nozzle

Claims (6)

A biological treatment aid holding unit filled with a biological treatment aid for making specific microorganisms in the sludge dominant, a sludge retention tank containing the biological treatment aid holding unit, and activated sludge from a water treatment facility A sludge input tank for receiving and leading to the sludge retention tank, a filter mechanism installed in the sludge input tank and capturing contaminants carried along with the activated sludge, and activated sludge brought into contact with a biological treatment aid in the sludge retention tank Bei example and a sludge discharge portion is returned to the water treatment facilities,
The biological treatment reactor , wherein the activated sludge that has flowed into the sludge charging tank is configured to overflow the partition dividing the sludge charging tank and the sludge retention tank and to be led to the sludge retention tank . A biological treatment aid holding unit filled with a biological treatment aid for making specific microorganisms in the sludge dominant, a sludge retention tank containing the biological treatment aid holding unit, and activated sludge from a water treatment facility A sludge input tank for receiving and leading to the sludge retention tank, a filter mechanism installed in the sludge input tank and capturing contaminants carried along with the activated sludge, and activated sludge brought into contact with a biological treatment aid in the sludge retention tank A sludge discharge unit for returning the water to the water treatment facility;
The activated sludge received in the sludge charging tank is configured to be led to the sludge retention tank after passing from the lower side to the upper side and passing through the filter mechanism, and the inflow portion of the activated sludge is upstream from the filter mechanism Biological treatment reactor that provided. Activated sludge is introduced into a sludge input tank equipped with a filter mechanism, and the activated sludge that has passed through the filter mechanism is overflowed with a partition partitioned from the sludge input tank to make it possible to predominate specific microbial groups The biological treatment aid contacting step, which leads to a sludge retention tank filled with the agent and takes out after contacting the biological treatment aid in the tank;
A washing step of interrupting the charging of the activated sludge into the sludge charging tank, discharging the activated sludge charged into the sludge charging tank and washing the filter mechanism;
Equipped with
An operation method of a biological treatment reactor operating so as to repeat the biological treatment aid contacting step and the cleaning step. Activated sludge is put into a sludge feeding tank equipped with a filter mechanism, and a biological treatment aid which makes the activated microorganism which has passed through the filter mechanism from the bottom to the top in the sludge feeding tank dominant in a specific microorganism group A biological treatment aid contacting step which leads to a filled sludge retention tank and takes it out after contacting the biological treatment aid in the tank;
A washing step of interrupting the charging of the activated sludge into the sludge charging tank, discharging the activated sludge charged into the sludge charging tank and washing the filter mechanism;
Equipped with
An operation method of a biological treatment reactor operating so as to repeat the biological treatment aid contacting step and the cleaning step. A receiving tank for receiving organic wastewater, a pretreatment facility for removing solid foreign matter from organic wastewater received in the receiving tank, single or biological treatment of organic wastewater from which solid foreign matter has been removed by the pretreatment facility A water treatment facility comprising a plurality of biological treatment tanks and a solid-liquid separation facility for solid-liquid separation of organic wastewater biologically treated in the biological treatment tank,
The water treatment equipment in which the biological treatment reactor according to claim 1 or 2 is incorporated in a sludge return path for returning a part of the sludge separated in the solid-liquid separation equipment to the biological treatment tank . A receiving tank for receiving organic wastewater, a pretreatment facility for removing solid foreign matter from organic wastewater received in the receiving tank, single or biological treatment of organic wastewater from which solid foreign matter has been removed by the pretreatment facility A water treatment facility comprising a plurality of biological treatment tanks and a solid-liquid separation facility for solid-liquid separation of organic wastewater biologically treated in the biological treatment tank,
The water treatment equipment in which the biological treatment reactor according to claim 1 or 2 is incorporated in a sludge return path for returning sludge extracted from the biological treatment tank to the biological treatment tank.

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