JP2007185596A - Organic wastewater treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an organic wastewater treatment apparatus which can reduce an installation area. <P>SOLUTION: The inside of a yeast reaction tank 1 is partitioned into two chambers by a screen 2 to form a yeast dominant chamber 3 and an activated sludge dominant chamber 4. Raw water is introduced into the yeast dominant chamber 3 through a raw water introduction pipe 5, and carriers 6 for making yeast dominant are made to flow into the yeast dominant chamber 3. Supernatant water generated in the activated sludge dominant chamber 4 is discharged through a supernatant water transfer pipe 7, and sludge generated in the activated sludge dominant chamber 4 is made to flow into a yeast activation tank 10 by a pipe body 8 and a pump 9. The yeast activation tank 10 increases the treatment capacity of a specific microorganism, such as yeast, and yeast activated in the yeast activation tank 10 is made to flow into the yeast dominant chamber 3 through a pipe body 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for treating yeast wastewater so that organic wastewater can be discharged into public water areas.

  Conventionally, wastewater containing high-concentration organic substances and hexane extract substances is treated by an activated sludge treatment method, a yeast treatment method, a pressurized flotation treatment method, or a treatment method combining any of these. In particular, in order to treat this type of waste water so that it can be discharged into public waters, it is necessary to use a yeast treatment method or a treatment method that combines a pressurized flotation treatment method and an activated sludge treatment method. For example, in a treatment method combining a yeast treatment method and an activated sludge treatment method, a yeast reaction tank, a yeast precipitation tank, an activated sludge reaction tank, and an activated sludge precipitation tank are required. In the activated sludge treatment method, waste water is introduced into an activated sludge reaction tank having activated sludge, and an organic substance in the waste water is oxidized and decomposed by activated sludge while aerated inside the activated sludge reaction tank. In the yeast treatment method, wastewater is introduced into a yeast reaction tank to which sulfuric acid, hydrochloric acid, or the like for making the environment suitable for yeast is added, and the organic substances in the wastewater are oxidatively decomposed while the yeast reaction tank is aerated. The pressurized flotation treatment method is a physicochemical treatment method that does not use microorganisms, and adds pressurized water to wastewater to separate and remove the floating hexane extract. In the treatment method combining the activated sludge treatment method and the yeast treatment method, the wastewater is treated by the yeast treatment method and then treated by the activated sludge treatment method. In this case, in the yeast treatment method, a high concentration organic substance and hexane extract substance are treated to a concentration that can be treated by the activated sludge treatment method. And the processing method which combined the activated sludge processing method and the pressurization flotation treatment method processes by the activated sludge treatment method, after separating and removing the hexane extraction substance by the pressurization flotation treatment method.

  In such a conventional wastewater treatment apparatus, in order to perform biological treatment, aeration means for aeration of the activated sludge reaction tank or the yeast reaction tank is provided. This type of aeration means is generally constituted by an air diffuser arranged at the bottom of each reaction tank, a blower provided outside each reaction tank, and a tube body connecting the air diffuser and the blower. The air diffuser of such aeration means is disposed on the entire top surface of the bottom wall of each reaction tank, disposed only in the vicinity of the left and right side walls of each reaction tank, Or arranged in a row. When the air diffuser is disposed on the entire top surface of the bottom wall of each reaction tank, an upward flow is generated only above the air diffuser, and as a result, the region between the air diffuser and the air diffuser is lowered. A stream is generated and activated sludge and yeast sludge are agitated by a number of small circulating streams. When the diffuser pipe is arranged only in the vicinity of the left and right side walls of each reaction tank, and when the diffuser pipe is arranged in the center of the left and right of the upper surface of the bottom wall of each reaction tank, Ascending flow is generated above the diffuser, and as a result, downward flow is generated in the region where the diffuser is not present, and the activated sludge and yeast sludge are agitated by one large circulating flow.

  The background art is a technique generally known to those skilled in the art, and does not relate to a known literature invention.

Since the conventional waste water treatment apparatus requires a yeast reaction tank, a yeast precipitation tank, an activated sludge reaction tank, and an activated sludge precipitation tank, the installation area is large and the equipment cost is high. In particular, wastewater treatment equipment that uses only the activated sludge treatment method often has a BOD (oxygen demand) volumetric load of 0.3 to 0.8 kg / m ³ · day. When organic substances are contained, a large activated sludge reaction tank is required. In addition, if the wastewater contains a high concentration of hexane extract, it cannot be treated only with a wastewater treatment device that uses only the activated sludge treatment method, and a combination of the activated sludge treatment method and the pressurized flotation treatment method. The waste water treatment equipment using the is necessary, and the equipment cost becomes high. In the wastewater treatment equipment using the pressurized flotation method, floss that deteriorates the working environment is generated. Therefore, in order to dispose of this floss, it is necessary to add a chemical in some cases, and operation management is complicated. This increases the operating cost.

Moreover, in the wastewater treatment apparatus using only the yeast treatment method, the BOD volumetric load is 5 to 10 kg / m ³ · day, so that the yeast reaction tank has a larger capacity than the wastewater treatment apparatus using only the activated sludge treatment method. Although it is small and the installation area is small, organic substances with a BOD of 100 to 200 mg / L remain in the treated water obtained by this wastewater treatment device, so it is allowed to discharge this treated water to public water bodies. Not. In addition, since the yeast sedimentation tank tends to become anaerobic, it takes a lot of time for the yeast to recover its processing capacity when the yeast placed under anaerobic conditions is returned to the yeast reaction tank.

  Furthermore, in the wastewater treatment equipment using the combination of the activated sludge treatment method and the yeast treatment method, treated water that can be discharged into public water areas can be obtained, but two reaction tanks, a yeast reaction tank and an activated sludge reaction tank, are required. In addition, two sedimentation tanks, a yeast sedimentation tank and an activated sludge sedimentation tank, which are respectively located in the subsequent stages are required, and the installation area is large and the equipment cost is high. In addition, the yeast reaction tank can respond even if the inflow load becomes larger than the set value to some extent, but if the inflow load becomes larger than a certain level, the organic matter (oil) attached to the yeast sludge will not be decomposed and the specific gravity will be reduced. There is a possibility of carry over from the yeast sedimentation tank. In addition, when the load is greatly reduced below the set value, the BOD removal rate in the yeast reaction tank is increased, so that an appropriate load cannot be obtained in the subsequent activated sludge reaction tank. For this reason, the activated sludge is dismantled in the activated sludge reaction tank, and the quality of the treated water is lowered. This occurs whether the previous yeast reaction tank is continuous or batch-wise.

  And in the waste water treatment equipment in which the diffuser tube of the aeration means is arranged on the entire top surface of the bottom wall of the yeast reaction tank, there is no large flow over the whole just by mixing up flow and down flow in the yeast reaction tank. Therefore, the ability to stir the yeast sludge is weak, and particularly when the concentration of yeast sludge is high, the yeast sludge may accumulate on the bottom wall of the yeast reaction tank. In addition, a waste water treatment apparatus in which the air diffuser is disposed only in the vicinity of the left and right side walls of the yeast reaction tank, and the air diffuser are disposed in one or a row in the center of the left and right of the upper surface of the bottom wall of the yeast reaction tank. In the wastewater treatment equipment, a large circulation flow occurs throughout, so that the yeast sludge does not accumulate on the bottom wall, but the air diffuser is partially arranged, so that a lot of air cannot be ejected. The oxygen supply capacity of the aeration means is low.

  This invention was made in order to solve the above-described problems, and its purpose is to obtain a wastewater treatment apparatus using yeast that can reduce the installation area and stably maintain the treatment performance. It is.

  The wastewater treatment apparatus using yeast according to the present invention is characterized in that a yeast reaction tank is provided with a carrier, and the yeast reaction tank is provided with a yeast activation tank.

  The wastewater treatment apparatus using yeast according to the present invention is characterized in that a yeast reaction tank is provided with a carrier, and the yeast reaction tank is provided with a solubilization tank.

  Since this invention can carry | support yeast on the support | carrier in a yeast reaction tank, the reaction by yeast can be improved. Moreover, since the number of yeasts can be kept favorable by the yeast activation tank, the contribution ratio of yeast can be improved. Therefore, the yeast treatment performance can be maintained stably and satisfactorily. Moreover, since the yeast reaction tank can have the roles of a conventional yeast precipitation tank and activated sludge reaction tank, the installation area can be reduced.

  Since this invention can carry | support yeast on the support | carrier in a yeast reaction tank, the reaction by yeast can be improved. In addition, since the oil component can be pulverized and homogenized by the solubilization tank, the oil removal rate can be improved. Therefore, the yeast treatment performance can be maintained stably and satisfactorily. Moreover, since the yeast reaction tank can have the roles of a conventional yeast precipitation tank and activated sludge reaction tank, the installation area can be reduced.

Embodiment 1 FIG.
FIG. 1 shows a wastewater treatment apparatus (hereinafter simply referred to as a wastewater treatment apparatus) using yeast in Embodiment 1 for carrying out the present invention. The inside of the yeast reaction tank 1 of this waste water treatment apparatus is divided into two chambers by a screen 2, and a yeast dominant chamber 3 and an activated sludge dominant chamber 4 are provided. Organic wastewater (hereinafter referred to as raw water) is introduced into the yeast dominant room 3 through the raw water introduction pipe 5, and a carrier 6 for predominating the yeast is introduced into the yeast dominant room 3. The sludge mixed treated water is discharged out of the system from the activated sludge dominant chamber 4 through the transfer pipe 7, and is thus separated into solid and liquid as necessary. The sludge generated in the activated sludge dominant chamber 4 is made to flow into the yeast activation tank 10 by the pipe body 8 and the pump 9. The yeast activation tank 10 is intended to enhance the processing ability (activity) of a specific microorganism such as yeast, and the yeast activated in the yeast activation tank 10 is allowed to flow into the yeast dominant chamber 3 via the tube 11. It is.

  Here, the carrier 6 is not limited in its material and shape as long as it can easily entangle yeast, such as string, fiber, cylinder, molding, mat, sponge, membrane, etc. It can be. Further, the carrier 6 can be replaced with activated carbon, Limpo, ring lace, bio fringe or the like. Furthermore, the yeast activation tank 10 can be a yeast culture tank, an empty aeration tank, a second yeast reaction tank, and a solubilization tank. The solubilization tank is an acid fermentation tank, an anaerobic tank, an alcohol fermentation tank, and a primary sedimentation tank. , Easy decomposition tank, sludge volume reduction tank, bacteria volume reduction tank. In addition, when there exists a deodorizing process, the pulverized coal which generate | occur | produces at the time of the regeneration process of the process can be used as activated carbon. In addition, when the yeast activation tank 10 is an empty aeration tank, it is possible to increase the activity of the yeast.

  In the waste water treatment apparatus in this Embodiment 1, since the inside of the yeast reaction tank 1 is divided into the yeast dominant chamber 3 and the activated sludge dominant chamber 4 by the screen 2, the carrier 6 is separated from the yeast dominant chamber 3 to the activated sludge superior. There is no movement to the occupied room 4. Therefore, in the yeast dominant room 3, the yeast entangled with the carrier 6 predominates, and the reaction by the yeast is improved. Moreover, since the yeast in the sludge produced in the activated sludge dominant room 4 is activated by the yeast activation tank 10 and flows into the yeast dominant room 3, the reaction by yeast is further improved.

  Furthermore, since the yeast reaction tank 1 is configured such that a conventional yeast reaction tank, a yeast precipitation tank, and an activated sludge reaction tank are integrated, the installation area is reduced. Moreover, since the support | carrier 6 is utilized, even if it is not equipped with the conventional yeast precipitation tank, a favorable water quality is obtained. Furthermore, it is possible to perform high-load treatment with the coexistence of yeast and activated sludge, the oil can be decomposed, and if necessary, a solid-liquid separation tank can be installed at the subsequent stage to discharge into public water areas. And since the yeast activity, ie, the number of yeasts, is kept good by the yeast activation tank 10, the contribution ratio of the yeasts during the treatment is improved.

  In the waste water treatment apparatus according to the first embodiment, the carrier 6 is introduced into the yeast-dominated chamber 3 of the yeast reaction tank 1, but the carrier 6 does not necessarily need to flow. Moreover, the yeast reaction tank 1 can also be made into a batch process or a membrane process, and when making it a batch process, it is preferable to provide supernatant water transfer means, such as a decanter, in the yeast reaction tank 1. The activated sludge dominant chamber 4 may contain a carrier 6.

Embodiment 2. FIG.
FIG. 2 shows a waste water treatment apparatus according to Embodiment 2 for carrying out the present invention. The inside of the yeast reaction tank 21 of this waste water treatment apparatus is divided into two chambers by a partition wall 22 having a water passage, and a yeast dominant chamber 23 and an activated sludge dominant chamber 24 are provided. Raw water is introduced into a yeast dominant chamber 23 through a raw water introduction pipe 25, and a carrier 26 for predominating yeast is introduced into the yeast dominant chamber 23. The sludge mixed treated water is discharged from the activated sludge dominant chamber 24 to the solid-liquid separation tank 28 through the transfer pipe 27. The treated water generated in the solid-liquid separation tank 28 is discharged out of the system through the treated water discharge pipe 29, and the sludge generated in the solid-liquid separation tank 28 flows into the yeast activation tank 32 by the pipe body 30 and the pump 31. I am trying to make it. The yeast activated in the yeast activation tank 32 is allowed to flow into the yeast dominant chamber 23 via the tube 33.

  The carrier 26 is the same as the carrier 6 in the first embodiment. The solid-liquid separation tank 28 is configured to separate the sludge mixed treated water flowing in from the yeast reaction tank 21 into upper clear treated water and lower yeast-containing activated sludge by gravity. However, the solid-liquid separation method is not limited, and may be a method employing a membrane separation method or a mechanical separation method such as a decanter or a concentrator. The yeast activation tank 32 is also similar to the yeast activation tank 10 in the first embodiment. Therefore, in the waste water treatment apparatus according to the second embodiment, the solid-liquid separation tank 28 functions as a conventional yeast precipitation tank and activated sludge precipitation tank, so that the installation area is reduced. Moreover, since the yeast reaction tank 21 is partitioned into the yeast dominant chamber 23 and the activated sludge dominant chamber 24 and the yeast activation tank 32 is provided, the same effect as in the first embodiment can be obtained. In addition, the yeast dominant room 23 and the activated sludge dominant room can be partitioned into a plurality of tanks.

Embodiment 3 FIG.
FIG. 3 shows a waste water treatment apparatus according to Embodiment 3 for carrying out the present invention, and the same parts as those in FIG. This waste water treatment apparatus differs from the yeast reaction tank 21 in the second embodiment in that the inside of the yeast reaction tank 21A is divided into three chambers by two partition walls 22. That is, an intermediate chamber 34 in which yeast and activated sludge coexist is provided between the yeast dominant chamber 23 and the activated sludge dominant chamber 24 in the yeast reaction tank 21A. The tube body 33 is branched into a tube body 33 a connected to the yeast dominant chamber 23 and a tube body 33 b connected to the intermediate chamber 34. Therefore, the inflow amount of yeast activated in the activation tank 32 and flowing into the yeast dominant chamber 23 and the intermediate chamber 34 can be controlled. Therefore, the wastewater treatment apparatus in the third embodiment has the same effect as that of the second embodiment, and has a processing efficiency by providing the yeast reaction tank 21A with an intermediate chamber 34 in which yeast and activated sludge coexist. Is further improved.

Embodiment 4 FIG.
FIG. 4 shows a waste water treatment apparatus according to Embodiment 4 for carrying out the present invention. The same parts as those in FIG. This waste water treatment apparatus is provided with a pipe body 35 for circulating the sludge mixed water and the floating carrier in the yeast dominant chamber 23 of the yeast reaction tank 21B, and a concentrator 36 is provided on the pipe body 35. Thus, the waste water treatment apparatus in the third embodiment is different. In the waste water treatment apparatus in the fourth embodiment, the yeast in the yeast dominant chamber 23 of the yeast reaction tank 21B is concentrated and returned to the yeast dominant chamber 23, so that the treatment efficiency with yeast is further improved.

Embodiment 5 FIG.
FIG. 5 shows a waste water treatment apparatus according to Embodiment 5 for carrying out the present invention, and the same parts as those in FIG. The yeast reaction tank 21C of this waste water treatment apparatus is arranged by arranging three yeast dominant chambers 23, intermediate chambers 34, and activated sludge dominant chambers 24 each having the same size as in the fourth embodiment. It is. For this reason, the raw water is diverted from the raw water introduction pipe 25 by the first diversion pipe 38 and individually flows into the yeast dominant chambers 23, and the sludge mixed treated water generated in each yeast dominant chamber 23 is the first confluence pipe. 39 to join together.

  Similarly, the merged water from the yeast dominant chamber 23 is diverted by the second diversion pipe 40 and individually flows into the intermediate chamber 34, and the sludge mixed treated water generated in each intermediate chamber 34 is the second merge pipe. 41 is made to merge. Further, the combined water from the intermediate chamber 34 is divided by the third branch pipe 42 and individually flows into the activated sludge dominant chamber 24, and the sludge mixed treated water generated in each activated sludge dominant chamber 24 is the third sludge mixed treatment water. It is made to discharge | emit to the solid-liquid separation tank 28 by the confluence | merging pipe | tube 43 and the transfer pipe | tube 27. FIG. The yeast activated in the yeast activation tank 32 is caused to flow into the raw water introduction pipe 25 and between the first junction pipe 39 and the second branch pipe 40.

Embodiment 6 FIG.
FIG. 6 shows a waste water treatment apparatus according to Embodiment 6 for carrying out the present invention. The waste water treatment apparatus includes a yeast reaction tank 51, a solid-liquid separation tank 52, and a yeast activation tank 53, and raw water is introduced into the yeast activation tank 53 via a raw water introduction pipe 54. . The yeast activated in the yeast activation tank 53 is allowed to flow into the yeast reaction tank 51 through the mixed solution introduction pipe 55. At this time, a part of the raw water is directly introduced into the yeast reaction tank 51 through the raw water flow pipe 56. A carrier 57 is put into the yeast reaction tank 51, and the sludge mixed treated water generated in the yeast reaction tank 51 is made to flow into the solid-liquid separation tank 52 through the transfer pipe 58. Then, the clear treated water generated in the solid-liquid separation tank 52 is discharged out of the system through the treated water discharge pipe 59, and the sludge generated in the solid-liquid separation tank 52 is passed through the pipe body 60 to the yeast activation tank 53. It is made to flow in.

  In the waste water treatment apparatus according to the sixth embodiment, microorganisms such as yeast are propagated in the yeast activation tank 53, so that the treatment efficiency is improved and the range of raw water to be treated is expanded. It is also possible to cause sludge to flow into the yeast activation tank 53 from the yeast reaction tank 51 or to change the ratio of the amount of raw water that flows into the yeast activation tank 53 and the amount of raw water that flows into the yeast reaction tank 51. A similar effect can be obtained.

Embodiment 7 FIG.
FIG. 7 shows a waste water treatment apparatus according to Embodiment 7 for carrying out the present invention. The same parts as those in FIG. In this waste water treatment apparatus, all raw water flows directly from the raw water introduction pipe 54 into the yeast reaction tank 51, and the yeast activated in the yeast activation tank 53 is transferred to the yeast reaction tank 51 by the pipe body 61. It differs from the waste water treatment apparatus in the sixth embodiment in that it is made to flow. Therefore, in the waste water treatment apparatus according to the seventh embodiment, the raw water and the yeast flow into the yeast reaction tank 51 to improve the treatment efficiency, and otherwise the same effects as in the sixth embodiment are obtained.

Embodiment 8 FIG.
FIG. 8 shows a waste water treatment apparatus according to Embodiment 8 for carrying out the present invention. The same parts as those in FIG. This waste water treatment apparatus differs from the waste water treatment apparatus of the sixth embodiment in that an acid fermentation tank 62 is provided instead of the yeast activation tank 53 in the sixth embodiment. In this case, the sludge generated in the solid-liquid separation tank 52 is caused to flow into the yeast reaction tank 51 and the acid fermentation tank 62 via the branch part 60a and the branch part 60b of the tubular body 60, respectively. Here, the acid fermenter 62 reduces the molecular weight of the organic substance in the raw water and ferments the acid. Therefore, in the waste water treatment apparatus in the eighth embodiment, the same effect as in the sixth embodiment can be obtained. In addition, if high concentration raw | natural water is poured into the acid fermenter 62 and the acid fermenter 62 is made anaerobic, the amount of generated sludge will decrease and the amount of sulfuric acid used will also decrease. The acid fermentation tank 62 can be replaced with a yeast culture tank.

Embodiment 9 FIG.
FIG. 9 shows a waste water treatment apparatus according to Embodiment 9 for carrying out the present invention. The same parts as those in FIG. This waste water treatment apparatus is provided with a second yeast reaction tank (oil removal tank) 63 at the upper stage of the yeast reaction tank 51 and an oil separation tank 64 at the upper stage of the second yeast reaction tank 63. This is different from the waste water treatment apparatus in the eighth embodiment. In this case, all of the raw water is introduced into the oil separation tank 64 through the raw water introduction pipe 54, and the upper layer oil separated in the oil separation tank 64 is introduced into the second yeast reaction tank 63 through the pipe body 65. It is. The raw water from which oil has been removed in the second yeast reaction tank 63 is allowed to flow into the yeast reaction tank 51 through the pipe body 66, and the raw water from which oil has been separated in the oil separation tank 64 is subjected to the yeast reaction through the pipe body 67. It is made to flow directly into the tank 51.

  In the waste water treatment apparatus in the ninth embodiment, the oil component is separated from the raw water in the oil separation tank 64, and the separated oil component is removed in the second yeast reaction tank 63. Therefore, the yeast in the second yeast reaction tank 63 is removed from the load condition. As a result, the processing efficiency is improved. As a result, the subsequent options such as the yeast reaction tank 51, the conventional activated sludge tank, and the anaerobic tank are widened. The sludge from the solid-liquid separation tank 52 is configured not only to flow into the yeast reaction tank 51 through the pipe body 61 but also into the second yeast reaction tank 63 through the pipe body 61a. Is also preferable.

Embodiment 10 FIG.
FIG. 10 shows a waste water treatment apparatus according to Embodiment 10 for carrying out the present invention. The same parts as those in FIG. This waste water treatment apparatus differs from the waste water treatment apparatus in the seventh embodiment in that the support 57 is not put into the yeast reaction tank 51 and the stirrer 68 and the cyclone 69 are provided for the solid-liquid separation tank 52. Is different. The stirrer 68 stirs the sludge settled at the bottom of the solid-liquid separation tank 52, and the cyclone 69 collects sand from the sludge guided from the solid-liquid separation tank 52 through the pipe body 70 to collect the solid-liquid separation tank 52. It is supposed to flow into Therefore, in the waste water treatment apparatus according to the tenth embodiment, the sand recovered from the sludge is reused, so that the precipitation efficiency is improved without adding a flocculant.

Embodiment 11 FIG.
FIG. 11 shows a waste water treatment apparatus according to an eleventh embodiment for carrying out the present invention. The same parts as those in FIG. In this waste water treatment apparatus, aeration means 71 is installed in the yeast reaction tank 51. The aeration means 71 is constituted by an air diffuser 72 disposed in the yeast reaction tank 51, a blower 73 disposed outside the yeast reaction tank 51, and a tube body 74 connecting the air diffuser 72 and the blower 73. A first ion generator 75 is arranged in the middle of the tube body 74, and a second ion generator 76 is arranged in the transfer pipe 58. The first ion generator 75 is installed so that bubbles generated by the aeration means 71 continue to be fine. The second ion generator 76 is installed to coarsen the fine bubbles.

  Therefore, in the waste water treatment apparatus according to the eleventh embodiment, the negative ions generated in the first ion generator 75 are mixed into the fine bubbles in the raw water in the yeast reaction tank 51, and the fine bubbles are formed by the negative ions. By repelling each other, bubbles do not form and the state of fine bubbles is maintained for a long time. This is the same when the aeration means 71 ejects fine air or when the aeration means 71 uses pure oxygen. Moreover, since the positive ions generated in the second ion generator 76 are mixed into the supernatant water from the yeast reaction tank 51 and the charges are neutralized to form bubbles, the sedimentation of sludge due to fine bubbles is prevented.

Embodiment 12 FIG.
FIG. 12 illustrates a main part of a waste water treatment apparatus according to Embodiment 12 for carrying out the present invention. The waste water treatment apparatus includes a batch type yeast reaction tank 81 and a control facility 82 for controlling the yeast reaction tank 81 by a batch type activated sludge method. The yeast reaction tank 81 is loaded with a carrier 83 and is provided with an aeration means 84 and a decanter 85. The raw water is introduced into the yeast reaction tank 81 by a raw water introduction pipe 86, a pump 87, and an on-off valve 88. The supernatant water from the decanter 85 is discharged out of the system by the pipe body 89, the on-off valve 90, and the pump 91. A part of the supernatant water is introduced into the yeast activation tank 94 via the direction control valve 92 and the pipe body 93 disposed in the pipe body 89, and the yeast activated in the yeast activation tank 94 is the pipe body 95. It is made to flow into the yeast reaction tank 81 via.

  The aeration means 84 can be constituted by an air diffuser 96 disposed at the bottom of the yeast reaction tank 81, a blower 97 disposed outside the yeast reaction tank 81, and a tubular body 98 connecting the air diffuser 97 and the blower 97. The control facility 82 controls the decanter 85, the pump 87, the on-off valve 88, the on-off valve 90, the pump 91, the direction control valve 92, the blower 97, and the like. In this case, as shown in FIG. 13, the control facility 82 causes the inflow process, the aeration process, the precipitation process, and the discharge process to be performed in time series, and allows fine bubbles to flow between the aeration process and the precipitation process. The sludge that is difficult to settle is floated and separated, and the treated water is taken from the middle.

Embodiment 13 FIG.
FIG. 14 shows a waste water treatment apparatus according to Embodiment 13 for carrying out the present invention. This waste water treatment apparatus includes a raw water introduction pipe 112 and a supernatant water transfer pipe 113 in a yeast reaction tank 111. In the yeast reaction tank 111, three chambers, that is, a relatively large-capacity one aeration chamber 117 located in the center and two left and right sides are provided by two partition walls 116 having upper and lower water flow portions 114 and 115, respectively. Two aeration chambers 118 having a relatively small capacity are provided. A large-capacity aeration means 119 is arranged below the central aeration chamber 117, and a small-capacity aeration means 120 is arranged above the same aeration chamber 117. The lower aeration means 119 is constituted by a diffuser tube 121, a blower 122 and a tube body 123, and the upper aeration means 120 is constituted by an aeration tube 124, a blower 125 and a tube body 126. A pure oxygen generator 127 is disposed in the pipe body 123 of the lower aeration means 119.

  Normally, when the lower aeration means 119 ejects air from the diffuser 121, the bubbles are large, so that a circulating flow is easily generated inside the yeast reaction tank 111. However, when the pure oxygen generator 127 is operated and the lower aeration means 119 ejects pure oxygen, since the size of the bubbles is fine, it is difficult for a circulating flow to be generated inside the yeast reaction tank 111. For this reason, in the thirteenth embodiment, air is diffused also from the diffuser tube 124 of the upper aeration means 120, so that the large bubbles ejected from the diffuser pipe 124 combine the fine bubbles from the diffuser pipe 121 of the lower aeration means 119. Foam. As a result, a large ascending force of coarse bubbles is added to the raw water in the yeast reaction tank 111, and a circulation flow is generated in the yeast reaction tank 111.

  As described above, the yeast activation tanks 10, 32, 53, and 94 used in Embodiments 1 to 12 are not limited in configuration as long as they can activate yeast. For example, as shown in FIG. A configuration as shown in FIG. 16 can be adopted. That is, the yeast activation tank 131 shown in FIG. 15 is a cylindrical body having one end 132 and the other end 133, and contains a mixed liquid of a carrier containing yeast and activated sludge containing yeast. The yeast activation tank 131 is installed so that its axis is inclined with respect to the horizontal and can be rotated around the axis. A plurality of guide plates 134 are provided at regular intervals on the inner peripheral surface of the yeast activation tank 131.

  In such a yeast activation tank 131, sludge is allowed to flow from the solid-liquid separation tank into one end 132 of the yeast activation tank 131, and the activated yeast is directed from the other end 133 of the yeast activation tank 131 toward the yeast reaction tank. It is preferable to let it flow out. At this time, when the yeast activation tank 131 rotates, the guide plate 134 stirs the mixed solution of the yeast carrier (carrier containing yeast) and the yeast sludge (activated sludge containing yeast), Move from the 132 side to the other end 133 side. Note that the inside of the yeast activation tank 131 is preferably maintained in an aerobic state by aeration means or surface aeration. The capacity of the yeast activation tank 131 is preferably determined in consideration of SRT and the like. It is desirable to maintain SRT for 12 to 24 hours and the pH of the mixed solution at about 4.5, while SRT is 6 to The pH of the mixed solution may be maintained at about 4 to 6 for 48 hours.

  On the other hand, the inside of the yeast activation tank 141 shown in FIG. 16 is partitioned by one partition wall 142, and a relatively small-capacity first chamber 143 and a relatively large-capacity second chamber 144 are provided. A tube 145 from the raw water is connected to the first chamber 143, and a tube 146 to the yeast reaction tank is connected to the second chamber 144. The partition wall 142 has an upper vertical portion 147 and a lower inclined portion 148. A large number of holes 149 are provided in the vertical portion 147, and an opening is provided in the lower end of the inclined portion 148 to serve as a transfer pipe. And the lower part of the 1st chamber 143 is made into the simple sedimentation part 150, and the sludge settled in this simple sedimentation part 150 is discharged | emitted out of the system through the pipe body 151. FIG. In this way, by removing the SS component from the raw water flowing into the yeast activation tank 141 in the simple sedimentation section 150, the extra load is reduced and the yeast activity can be increased.

Embodiment 14 FIG.
17 and 18 show a wastewater treatment apparatus in Embodiment 14 for carrying out the present invention. The aerobic treatment tank 161 of this waste water treatment apparatus can be used as, for example, a yeast reaction tank or an activated sludge reaction tank, and includes three partition walls 164 each having an upper water passage 162 and a lower water passage 163. A relatively large-capacity aeration chamber 165 at the center and two relatively small-capacity non-aeration chambers 166 on the left and right sides are provided. The aeration chamber 165 is aerated by the aeration means 167. The aeration means 167 includes a plurality of air diffusers 168 arranged closely at the bottom of the aeration chamber 165, an air source (not shown) arranged outside the aerobic treatment tank 161, and the air diffuser 168 and the air source connected to each other. The tube body 169 can be configured.

  Here, the ratio of the volume of the aeration chamber 165 to the volume of the non-aeration chamber 166 is preferably 10: 1 to 10:10 (1: 1). Further, the area of the upper water passage 162 and the area of the lower water passage 163 are preferably 50 to 200% of the cross-sectional area of the aeration chamber 166. The amount of air ejected from the air diffuser 168 of the aeration means 167 is preferably configured to be controlled by changing the pressure of the air source or the hole diameter of the air diffuser 168.

  In this aerobic treatment tank 161, when air is ejected from the diffuser pipe 168 of the aeration means 167 to the aeration chamber 165, an upward flow is generated in the aeration chamber 165, and the raw water flows from the left and right non-aeration chambers 166 to the lower water passage 163. Then, the air flows into the aeration chamber 165 and flows out from the aeration chamber 165 through the upper water passage 162 to the non-aeration chamber 166, and the raw water circulates in the aerobic treatment tank 161. This circulating flow concentrates on the lower water passage 163 of the partition wall 164.

  As described above, in the waste water treatment apparatus according to the fourteenth embodiment, the raw water concentrates and flows through the lower water flow portion 163 of the partition wall 164, so that even if the sludge concentration in the raw water is high, the sludge is an aerobic treatment tank. The processing efficiency is improved without depositing on the bottom of 161. Further, since the aeration tube 168 of the aeration means 167 is densely arranged in the aeration chamber 165, a large amount of air can be ejected from the aeration tube 168 to the entire aeration chamber 165, and the oxygen supply capability is improved.

  In addition, if the pressure of the air source of the aeration means 167, that is, the amount of air ejected from the diffuser pipe 168 is temporally controlled, the strength of the circulating flow can be controlled. Further, if the hole diameter of the air diffusing tube 168 is reduced, the bubble diameter ejected therefrom is reduced, so that the rising speed of the bubbles is reduced and the air content per unit volume of the raw water is increased. For this reason, the air lift effect is improved, and the same effect as when the air supply amount is increased can be obtained.

Embodiment 15 FIG.
19 and 20 show a wastewater treatment apparatus according to Embodiment 15 for carrying out the present invention. The same parts as those in FIGS. The aerobic treatment tank 161A of this waste water treatment apparatus is divided into a central strong aeration chamber 170 and two left and right weak aeration chambers 171 by two partition walls 164, and the aerobic treatment tank 161 in the fourteenth embodiment. Is different. That is, the strong aeration chamber 170 is aerated by the aeration means 172 having a strong aeration force, and the weak aeration chamber 171 is aerated by the aeration means 173 having a weak aeration force. For this reason, the diffuser tube 174 of the aeration unit 172 is disposed in the strong aeration chamber 170, and the diffuser tube 175 of the aeration unit 173 is disposed in the weak aeration chamber 171. Note that the air diffusers 174 and 175 of the aeration means 172 and 173 are connected to separate air sources via the pipe bodies 176 and 177, respectively.

  In the aerobic treatment tank 161A in the fifteenth embodiment, the air supply amount per unit area of the diffuser tube 175 disposed in the weak aeration chamber 171 is the air per unit area of the diffuser tube 174 disposed in the strong aeration chamber 170. Since it is smaller than the supply amount, an upward flow is generated in the strong aeration chamber 170 and a downward flow is generated in the weak aeration chamber 171. At this time, since the weak aeration chamber 171 is also aerated, the oxygen supply amount is increased and the processing efficiency is further improved. Needless to say, even in the aerobic treatment tank 161A in the fifteenth embodiment, the hole diameters of the air diffusion tubes 174 and 175 and the pressure of the air source can be changed. Further, the efficiency is further improved by generating pure oxygen from the air diffuser 175 to form fine bubbles.

Embodiment 16 FIG.
FIGS. 21 and 22 show a wastewater treatment apparatus according to Embodiment 16 for carrying out the present invention. The same parts as those in FIGS. The aerobic treatment tank 161B of this waste water treatment apparatus is different from the waste water treatment apparatus in the fourteenth embodiment in that the aeration pipe 168 of the aeration means 167 is disposed above the position of one third of the water depth. . That is, the relationship between the distance A (vertical distance between the water surface and the diffuser 168) and the distance B (vertical distance between the diffuser 168 and the bottom wall) is 3B ≧ A + B.

  In the aerobic treatment tank 161B in the sixteenth embodiment, an upward flow is generated in the central aeration chamber 165 and a downward flow is generated in the left and right non-aeration chambers 166, so that the same effect as in the fourteenth embodiment can be obtained. . In addition, since the air diffuser 168 is disposed above the position of one third of the water depth, even when the water depth is deep, aeration can be performed at a relatively shallow position. Therefore, since the whole can be aerated at a relatively low pressure, the aeration efficiency is improved and the cost is reduced.

Embodiment 17. FIG.
FIG. 23 and FIG. 24 show the waste water treatment apparatus in the seventeenth embodiment for carrying out the present invention. The same parts as those in FIG. 21 and FIG. In the aerobic treatment tank 161C of this waste water treatment apparatus, two partition walls 164 are provided at intervals in the middle of the left and right, and the outside of the two partition walls 164 is used as an aeration chamber 165 having a relatively large capacity. It differs from the aerobic treatment tank 161B in Embodiment 16 in that the inside of 164 is an aeration chamber 166 having a relatively small capacity. In this case, the air diffuser 168 of the aeration means 167 of the aeration chamber 165 is arranged above the position of one third of the water depth as in the case of the sixteenth embodiment.

  Therefore, in the waste water treatment apparatus according to the seventeenth embodiment, an upward flow is generated in the left and right aeration chambers 165 and a downward flow is generated in the central non-aeration chamber 166. For this reason, even if bubbles are generated in the circulating flow, the bubbles are not drawn into the central aeration chamber 166 and the bubbles do not flow out of the aerobic treatment tank 161C. Further, since the bubbles are drawn below the water surface, the bubbles physically disappear.

Embodiment 18 FIG.
25 and 26 show a waste water treatment apparatus in an eighteenth embodiment for carrying out the present invention. The same parts as those in FIGS. In the aerobic treatment tank 161D of this waste water treatment apparatus, the aerobic treatment tank 161 in the fourteenth embodiment is provided in that the partition wall 164 is provided in the middle of the left and right of the aerobic treatment tank 161D, and two left and right aeration chambers 165 are provided. Is different. In this case, the aeration pipes 168 of the aeration means 167 are arranged in both the aeration chambers 165, respectively, and the air ejected from the aeration pipes 168 is changed quantitatively and temporally.

  In the eighteenth embodiment, since the air ejected from the air diffuser 168 of the air diffuser 167 is changed quantitatively and temporally, as shown in FIG. 26, one (left side in the figure) is shown. When the amount of air ejected from the aeration tube 168 of the aeration chamber 165 is larger than the amount of air ejected from the other (right side as viewed in the drawing) of the aeration tube 168, an upward flow is generated in one aeration chamber 165, A downward flow is generated in the other aeration chamber 165. Therefore, in the waste water treatment apparatus according to the eighteenth embodiment, the strength of the circulating flow, that is, the stirring strength of the sludge can be set freely, and the same effect as in the fourteenth embodiment can be obtained. The inside of the aerobic treatment tank 161D is divided into three or more aeration chambers 165 by a plurality of partition walls 164, and the aeration pipes 168 of the aeration means 167 are arranged in the aeration chambers 165, respectively, and the air ejected from the aeration pipes 168 Can also be configured to vary quantitatively or temporally.

Embodiment 19. FIG.
27 and 28 show a wastewater treatment apparatus according to Embodiment 19 for carrying out the present invention. The same parts as those in FIGS. This wastewater treatment apparatus is different from the wastewater treatment apparatus in Embodiment 17 in that the inside of the aerobic treatment tank 161E is divided into three aeration chambers 165 and two aeration chambers 166 by two pairs of partition walls 164. Yes. In other words, the aerobic treatment tank 161E is elongated in the direction in which the raw water flows, and an aeration chamber 165, an aeration chamber 166, an aeration chamber 165, an aeration chamber 166, and an aeration chamber 165 are sequentially provided from the upstream side. Is provided. The aeration tubes 168 of the aeration means 167 are densely arranged in the aeration chambers 165. Also in this case, the ratio of the aeration chamber 165 and the non-aeration chamber 166 is preferably 10: 1 to 1: 1.

  As shown in FIG. 28, the raw water that has flowed into the aerobic treatment tank 161E becomes an upward flow in the uppermost aeration chamber 165, a downward flow in the non-aeration chamber 166 at the subsequent stage, and an upward flow again in the central aeration chamber 165. Then, the flow again decreases in the non-aeration chamber 166 at the subsequent stage and rises in the aeration chamber 165 at the lowermost stage. Therefore, in the waste water treatment apparatus in the nineteenth embodiment, the aeration chamber 165 and the non-aeration chamber 166 are compared when the overall shape of the aerobic treatment tank 161E is an extreme rectangle or when the area of the water surface with respect to the water depth is large. Therefore, the bottom of the aerobic treatment tank 161E can be satisfactorily stirred, and the same effect as in the seventeenth embodiment can be obtained.

  In Embodiments 14 to 19, the ratio of the volume of the aeration chamber 165 to the volume of the non-aeration chamber 166 is 10: 1 to 1: 1, and the area of the upper water passage 162 and the lower water passage 163 are the same. The area of 50 to 200% of the cross-sectional area of the aeration chamber 166 is not limited, but the shape and volume of the aerobic treatment tanks 161 and 161A to 161E, the aeration means 167, 172, and 173 It can be changed according to the amount of air discharged from the air diffusers 168, 174, 175, and the like. Further, the types of the diffuser tubes 168, 174, and 175 are not limited, and almost all diffuser tubes such as high-speed diffuser plates, perforated tubes, static mixers, and bag-like tubes can be applied.

Embodiment 20. FIG.
FIG. 29 shows a waste water treatment apparatus in the twentieth embodiment for carrying out the present invention. This waste water treatment apparatus includes a first yeast reaction tank 181 on the front stage side and a second yeast reaction tank 182 on the rear stage side, and further includes a flow rate adjustment tank (load adjustment tank) 183 on the front stage side of the first yeast reaction tank 181. ing. The first yeast reaction tank 181 and the second yeast reaction tank 182 are batch-type, that is, perform an inflow process, a treatment process, a precipitation process, a discharge process, etc. in time series. The flow rate adjustment tank 183 stores raw water such as fishery processing wastewater and adjusts the amount of raw water flowing out to the first yeast reaction tank 181, that is, the load.

  The first yeast reaction tank 181 retains the raw water flowing in from the flow rate adjustment tank 183 and grows the yeast-containing activated sludge, and removes oil to reduce the load on the second yeast reaction tank 182. The second yeast reaction tank 182 retains the low-concentration supernatant water that has flowed in from the first yeast reaction tank 181 so as to proliferate the yeast-containing activated sludge and to perform solid-liquid separation. Therefore, the 1st yeast reaction tank 181 and the 2nd yeast reaction tank 182 shall show the effect | action of the conventional yeast reaction tank, a yeast precipitation tank, an activated sludge reaction tank, and an activated sludge precipitation tank.

  Raw water is introduced into the flow rate adjusting tank 183 through a raw water introduction pipe 184. Between the flow rate adjustment tank 183 and the first yeast reaction tank 181, raw water transfer means 185 for transferring the raw water in the flow rate adjustment tank 183 into the first yeast reaction tank 181 is provided. Both yeast reaction tanks 181 and 182 include yeast to adjust the activity of yeast contained in the raw water in the yeast reaction tanks 181 and 182, the activity of activated sludge, and the biota temporally or spatially. Yeast injection means 186 and 187 for injecting the yeast into the yeast reaction tanks 181 and 182, respectively. The yeast reaction tanks 181 and 182 are provided with aeration means 188 and 189, respectively, for aerobically maintaining the inside thereof.

  Furthermore, between the first yeast reaction tank 181 and the second yeast reaction tank 182, the supernatant water transfer means 190 for discharging the low concentration supernatant water generated in the first yeast reaction tank 181 to the second yeast reaction tank 182. The first yeast reaction tank 181 is provided with sludge extraction means 191 for extracting the settled sludge out of the system. The second yeast reaction tank 182 is provided with treated water discharging means 192 for discharging the clear treated water generated there from the system, and provided with sludge extraction means 193 for extracting the settled sludge out of the system. is there.

  The raw water transfer means 185 can be constituted by a pump 194 disposed at the bottom of the flow rate adjusting tank 183 and a tube body 195 having one end connected to the pump 194 and the other end opened into the first yeast reaction tank 181. Further, the aeration means 188 and 189 are respectively a diffuser pipe 196 disposed at the bottom of the yeast reaction tanks 181 and 182, a blower 197 disposed respectively outside the yeast reaction tanks 181 and 182, and a diffuser pipe 196. And the blower 197 are connected to each other by a tube body 198.

  The configuration of the flow rate adjusting tank 183 is not limited as long as the amount of raw water input to the first yeast reaction tank 181 can be adjusted. The raw water transfer means 185, the supernatant water transfer means 190, the sludge extraction means 191, the treated water discharge means 192, the sludge extraction means 193, and the like can be configured by forced transfer by a pump, natural flow by gravity, and the like. Further, the yeast injection means 186, 187 is limited in its configuration as long as the yeast activity, activated sludge activity, and biological phase can be adjusted temporally or spatially according to the substance to be removed or its concentration. Not what you want. Sludge from the precipitation steps in the yeast reaction tanks 181 and 182 can be returned to the yeast injection means 186 and 187, respectively, and used as a yeast activation tank. As long as the aeration means 188 and 189 can aerate the inside of the yeast reaction tanks 181 and 182 with air or pure oxygen, a multistage aeration device, a disk type aeration device, a cylindrical aeration device, a draft tube type diffusion An air device or the like can be used.

  In addition, since the growth rate of activated sludge is greater than the growth rate of yeast, in order for both the yeast and activated sludge to coexist without the activated sludge predominating in the yeast reaction vessels 181 and 182, the yeast reaction vessel 181 is used. The pH in 182 is preferably 5.0 to 7.0, which is advantageous for the inhabiting of yeast, and more preferably 5.5 to 6.0. Examples of yeasts injected from the yeast injection means 186 and 187 include the genus trichosporon, genus candida, genus hansenula, genus saccharomyces, genus kluyveromyces, etc. Can be used. However, other types of yeast can be used as long as they can assimilate organic substances.

  Here, since the first yeast reaction tank 181 is a batch type, four steps, that is, an inflow step, a treatment step, a precipitation step, and a discharge step proceed. In the inflow process, the raw water flows from the flow rate adjustment tank 183 into the first yeast reaction tank 181. In the treatment step, the yeast injection means 186 injects the yeast into the first yeast reaction tank 181, and the aeration means 188 aerates the inside of the first yeast reaction tank 181, and the inflow raw water is biologically adsorbed by activated sludge. Process by action. During this time, in the precipitation step, activated sludge is precipitated in the first yeast reaction tank 181, and as a result, low-concentration supernatant water is generated. In the discharging step, the supernatant water transfer means 190 transfers the supernatant water to the second yeast reaction tank 182.

  In such a first yeast reaction tank 181, the second processing step proceeds again. In this second treatment step, the organic substance adsorbed in the treatment step before the precipitation step is treated by biological oxidation. Then, after the second processing step, the second inflow step proceeds again. And after a 2nd process process and a 2nd inflow process are complete | finished, the sludge extraction means 191 extracts the excess sludge in the 1st yeast reaction tank 181 out of the system.

  Similarly, since the second yeast reaction tank 182 is also a batch type, the inflow process, the treatment process, the precipitation process, and the discharge process proceed there. In the inflow process, low-concentration supernatant water flows from the first yeast reaction tank 181. In the treatment step, the yeast injection means 187 injects the yeast into the second yeast reaction tank 182 and the aeration means 189 aerates the second yeast reaction tank 182 and the infused low-concentration supernatant water is used as activated sludge. Treat by biological adsorption and oxidation. During this time, in the precipitation step, activated sludge is precipitated in the second yeast reaction tank 182, and as a result, clear treated water is produced. In the discharging step, the treated water discharging means 192 discharges clear treated water out of the system. Further, if necessary, the sludge extraction means 193 extracts excess sludge generated in the second yeast reaction tank 182 out of the system.

  Fishery processing wastewater was used as raw water and treated using the wastewater treatment apparatus in the above-described Embodiment 20. Other implementation conditions were as follows. That is, each volume of the 1st yeast reaction tank 181 and the 2nd yeast reaction tank 182 was 12L (liter), and the quantity of treated water was 20L / day. The raw water quality was BOD (biochemical oxygen demand) of 4,400 mg / L, SS (floating matter) concentration of 920 mg / L, and hexane extractant concentration of 580 mg / L.

  The process in the first yeast reaction tank 181 was as follows. Raw water flows into the first yeast reaction tank 181 in the inflow process of 0 to 2.5 hours, and the main treatment of the activated sludge adsorption action proceeds in the treatment process of 0 to 2.5 hours. In the 5 hour discharge step, the low-concentration supernatant water flowed out from the first yeast reaction tank 181 to the second yeast reaction tank 182. After this discharge step, the treatment step was started again at 5 to 8 hours, and the organic substances adsorbed in the treatment step at 0 to 2.5 hours were oxidatively decomposed.

  During this time, the pH in the first yeast reaction tank 181 is adjusted to 5.6 to 5.8 in order to increase the activity of the yeast at 5 to 7 hours, and the activated sludge is activated at 7 to 8 hours. The pH was adjusted to neutral so as not to inhibit the degree. This pH adjustment was performed in order to treat the activated sludge with a low-concentration organic substance that could not be treated by yeast by increasing the activity of the activated sludge. Thereafter, the inflow process was started again at 0 to 2 hours. In this inflow process, the pH was adjusted to neutral in order to increase the activity of the activated sludge and promote its adsorption action.

  Thus, as a result of operating the BOD-SS load of the first yeast reaction tank 181 as 1.3 kg / kg · day, the average water quality of the low-concentration supernatant water generated in the first yeast reaction tank 181 is BOD. 300 mg / L, SS concentration was 100 mg / L, and hexane extractant concentration was 37 mg / L. Other results including these results are shown in the column of “First yeast reactor” in Table 1.

  On the other hand, the process in the 2nd yeast reaction tank 182 was as follows. In the inflow process of 3 to 5 hours, low-concentration supernatant water flows from the first yeast reaction tank 181 into the second yeast reaction tank 182 and in the treatment process of 3 to 8 hours, the influent water is adsorbed and oxidized by activated sludge. In the precipitation process and discharge process of 1 to 3 hours, clear treated water was obtained. At this time, the low-concentration supernatant water that flowed into the second yeast reaction tank 182 was in a state where it could be treated with conventional activated sludge, and thus the yeast injection means 187 was not used.

  In this way, as a result of operating the second yeast reaction tank 182 with a BOD-SS load of 0.22 kg / kg · day, the average water quality of the clear treated water produced in the second yeast reaction tank 182 was 12 mg BOD. / L, SS concentration was 10 mg / L, and hexane extractant concentration was 8 mg / L. Other results including these results are shown in the column of “second yeast reaction tank” in Table 1.

  The same raw water, waste water treatment equipment, and operation process as in Example 1 were used. The respective volumes of the yeast reaction tanks 181 and 182 were 12 L (liters) as in Example 1, and the amount of treated water was 20 L / day. The water quality of the raw water was 1,260 mg / L BOD, 310 mg / L SS concentration, and 200 mg / L hexane extractable substance concentration.

  As a result of operating the first yeast reaction tank 181 with a BOD-SS load of 0.61 kg / kg · day, the average water quality of the low-concentration supernatant water generated in the first yeast reaction tank 181 is BOD of 110 mg / L, SS The concentration was 68 mg / L, and the hexane extractant concentration was less than 5 mg / L. And as a result of having operated the BOD-SS load of the 2nd yeast reaction tank 182 as 0.24 kg / kg * day, the average water quality of the clear treated water is BOD 15 mg / L, SS concentration 10 mg / L, hexane extraction The substance concentration was less than 5 mg / L. Other results including these results are also shown in Table 2.

Comparative Example 1
A wastewater treatment apparatus comprising a conventional yeast reaction tank, yeast precipitation tank, activated sludge reaction tank, and activated sludge precipitation tank was used to treat aquatic processing wastewater by combining yeast treatment and activated sludge treatment. The results were as shown in Table 3. As shown in Table 3, when the BOD-SS load was 1.1 kg / kg · day and the pH was 5.6 to 5.8, the average water quality of the treated water was BOD 110 mg / L and SS 80 mg / L, and hexane extractant was 29 mg / L. Furthermore, as a result of operating the yeast treated water with respect to the activated sludge reaction tank at a BOD-SS load of 0.18 kg / kg · day, the average water quality of the treated water was 12 mg / L for BOD, 13 mg / L for SS, and hexane. Extracted material was 12 mg / L.

Comparative Example 2
Fishery processing wastewater was treated by a wastewater treatment device that combines conventional yeast treatment and continuous activated sludge treatment. The results were as shown in Table 4. As shown in Table 4, the BOD-SS load was 0.42 kg / kg · day, and the pH was 5.6 to 5.8. As a result, the average water quality of the treated water was BOD 56 mg / L and SS 47 mg / L, hexane extractant was less than 5 mg / L. Furthermore, as a result of operating the yeast treated water with respect to the activated sludge reaction tank at a BOD-SS load of 0.09 kg / kg / day, the average water quality of the treated water is 22 mg / L for BOD and 5 mg / L for the hexane extract. Was less than. In this case, the disassembled sludge was mixed in the treated water, and the SS was 23 mg / L.

Comparative Example 3
Fishery processing wastewater was treated by a wastewater treatment device that combined conventional batch-type yeast treatment and continuous activated sludge treatment. The results were as shown in Table 5. As shown in Table 5, the BOD-SS load was 1.6 kg / kg · day, and the pH was 5.6 to 5.8. As a result, the average water quality of the treated water was 120 mg / L BOD, hexane extraction The material was 26 mg / L. Furthermore, as a result of operating the yeast treated water with respect to the activated sludge reaction tank with a BOD-SS load of 0.20 kg / kg · day, the average water quality of the treated water is 12 mg / L for BOD and 15 mg / L for the hexane extract. Met.

  As described above, in the wastewater treatment apparatus in the twentieth embodiment, the water quality similar to the conventional one or more is treated in three tanks of the first yeast reaction tank 181, the second yeast reaction tank 182 and the flow rate adjustment tank 183. You can get water. In this case, although the 1st yeast reaction tank 181 or the 2nd yeast reaction tank 182 becomes a little larger than the conventional yeast processing tank, since the conventional yeast precipitation tank and activated sludge precipitation tank become unnecessary, installation area, ie, equipment Cost is reduced.

  Moreover, since the batch system was introduced into the first yeast reaction tank 181 and the second yeast reaction tank 182, the yeast-containing activated sludge can be prevented from becoming anaerobic over a long period of time, and the treatment performance can be stably improved. Can be maintained. Moreover, since the activity of yeast, the activity of activated sludge, and the biota can be adjusted spatially or temporally in each of the first yeast reaction tank 181 and the second yeast reaction tank 182, the raw water is more stable than before. Can be processed. Furthermore, even when the inflowing load fluctuates, the amount of raw water flowing into the first yeast reaction tank 181 can be adjusted by the flow rate adjustment tank 183, so that the treatment performance can be maintained well. And since a hexane extract substance reduces, the processing water with little oil content can be obtained, the apparatus for removing an oil content becomes unnecessary, and an installation area further reduces.

  In the wastewater treatment apparatus of the twentieth embodiment, when the organic substance concentration or the hexane extractant concentration of the low-concentration supernatant water flowing into the second yeast reaction tank 182 is high enough to adversely affect the activated sludge treatment. By increasing the activity of the yeast in the second yeast reaction tank 182, good quality treated water can be obtained. In addition, although two yeast reaction tanks 181 and 182 are installed, three or more yeast reaction tanks are connected in series, in parallel, or in series and parallel depending on the organic substance concentration of raw water, hexane extract substance concentration, and inflow pattern. Can be installed in combination. Furthermore, although the flow rate adjusting tank 183 is installed at the front stage of the first yeast reaction tank 181, if it is installed at the rear stage of the first yeast reaction tank 181, the second yeast reaction tank 182 is converted into the conventional activated sludge reaction tank and activated sludge sedimentation. It can be replaced with a tank.

  Further, if the plurality of first yeast reaction tanks 181 are arranged in parallel and the inflow process is continued, the flow rate adjustment tank 183 can be omitted. For example, the operation process when two first yeast reaction tanks 181 are arranged in parallel can be performed as follows. That is, in one first yeast reaction tank 181, the inflow process and the treatment process at 0 to 2 hours, the precipitation process at 2 to 2.5 hours, the discharge process at 2.5 to 3 hours, and 3 to 4 hours. The eye can be the second processing step. In the other first yeast reaction tank 181, the precipitation process is performed at 0 to 0.5 hours, the discharge process is performed at 0.5 to 1 hours, the treatment process is performed at 1 to 4 hours, and the second and 4th hours are introduced. It can be a process.

  Furthermore, while arranging the two first yeast reaction tanks 181 in series and providing the second yeast reaction tank 182 with stirring means and repeating the aeration process and the stirring process during the treatment process, nitrogen is removed. It becomes possible. In this case, if the load of the organic substance flowing into the second yeast reaction tank 182 is adjusted by changing the operation process of the first yeast reaction tank 181, the organic substance is organic for removing nitrogen. It can be used as a material source. In the 1st yeast reaction tank 181 of such a structure, 0-1.5 hours are the 1st inflow process, 0-0.5 hours are the 1st processing process, and 0.5-1 hours are the 1st process steps. 1 precipitation process, 1-2 hours first discharge process, 2-3.5 hours second treatment process, 3-4.5 hours second inflow process, 3.5-4 Time can be the second precipitation step, 4-5 hours can be the second discharge step, and 5-6 hours can be the third treatment step. Moreover, in the 2nd yeast reaction tank 182, the discharge | emission process is carried out for 0 to 1 hour, the 1st inflow process for 1 to 2 hours, the treatment process for 1 to 5 hours, and the second inflow for 4 to 5 hours. The 5th to 6th hour of the process can be a precipitation process. And among the processing steps of 1 to 5 hours, the stirring step is 4 times of 1 to 1.75 hours, 2 to 2.75 hours, 3 to 3.75 hours, and 4 to 4.75 hours. It can be.

It is a block diagram of the waste water treatment equipment which shows Embodiment 1 of this invention. It is a block diagram of the waste water treatment equipment which shows Embodiment 2 of this invention. It is a block diagram of the waste water treatment equipment which shows Embodiment 3 of this invention. It is a block diagram of the waste water treatment equipment which shows Embodiment 4 of this invention. It is a block diagram of the waste water treatment equipment which shows Embodiment 5 of this invention. It is a block diagram of the waste water treatment equipment which shows Embodiment 6 of this invention. It is a block diagram of the waste water treatment equipment which shows Embodiment 7 of this invention. It is a block diagram of the waste water treatment equipment which shows Embodiment 8 of this invention. It is a block diagram of the waste water treatment equipment which shows Embodiment 9 of this invention. It is a block diagram of the waste water treatment equipment which shows Embodiment 10 of this invention. It is a block diagram of the waste water treatment equipment which shows Embodiment 11 of this invention. It is a block diagram of the waste water treatment equipment which shows Embodiment 12 of this invention. It is explanatory drawing of the palindromic processing process in Embodiment 12 of this invention. It is a block diagram of the waste water treatment equipment which shows Embodiment 13 of this invention. It is a perspective view of the yeast activation tank which can be used for the waste water treatment equipment of this invention. It is a block diagram of the yeast activation tank which can be used for the waste water treatment equipment of this invention. It is a top view of the waste water treatment equipment which shows Embodiment 14 of this invention. It is a side view of the waste water treatment equipment which shows Embodiment 14 of this invention. It is a top view of the waste water treatment equipment which shows Embodiment 15 of this invention. It is a side view of the waste water treatment equipment which shows Embodiment 15 of this invention. It is a top view of the waste water treatment equipment which shows Embodiment 16 of this invention. It is a side view of the waste water treatment equipment which shows Embodiment 16 of this invention. It is a top view of the waste water treatment equipment which shows Embodiment 17 of this invention. It is a side view of the waste water treatment equipment which shows Embodiment 17 of this invention. It is a top view of the waste water treatment equipment which shows Embodiment 18 of this invention. It is a side view of the waste water treatment apparatus which shows Embodiment 18 of this invention. It is a top view of the waste water treatment apparatus which shows Embodiment 19 of this invention. It is a side view of the waste water treatment apparatus which shows Embodiment 19 of this invention. It is a block diagram of the waste water treatment equipment which shows Embodiment 20 of this invention.

Explanation of symbols

1, 21, 51, 81, 181 Yeast reaction tank 2 Screen 3, 23 Yeast dominant room 4, 24 Activated sludge dominant room 6, 26 Carrier 10, 32, 53, 94, 131 Yeast activation tank 22, 116, 142, 164 Partition wall 28, 52 Solid-liquid separation tank 34 Intermediate chamber 36 Concentrator 62 Acid fermentation tank 63, 182 Second yeast reaction tank 64 Oil separation tank 68 Stirrer 69 Cyclone 71, 84, 119, 124, 167, 172, 173, 188, 189 Aeration means 75, 76 Ion generator 82 Control equipment 85 Decanter 129 Pure oxygen generator 134 Guide plate 150 Simple sedimentation part 161, 161A-161E Aerobic treatment tank 162 Upper water flow part 163 Lower water flow part 165 Aeration chamber 166 Non-aeration chamber 170 Strong aeration chamber 171 Weak aeration chamber 183 Flow rate adjustment tank (load adjustment tank)
186, 187 Yeast injection means

Claims (4)

  A wastewater treatment apparatus using yeast, comprising a support in a yeast reaction tank and a yeast activation tank in the yeast reaction tank.   A wastewater treatment apparatus using yeast, wherein the yeast reaction tank is provided with a carrier, and the yeast reaction tank is provided with a solubilization tank.   2. The wastewater treatment apparatus using yeast according to claim 1, wherein the yeast reaction tank is equipped with a control facility and can be operated by a batch activated sludge process, and further includes a fine bubble supply pipe.   The wastewater treatment apparatus using yeast according to claim 1 or 2, wherein the yeast reaction tank is partitioned into a plurality of chambers, and aeration means is provided in at least one of the chambers.

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