JP2008049343A - Organic waste water treatment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic waste water treatment device, wherein optimum control can be performed depending on the variation of a BOD (biochemical oxygen)-SS (suspended substances) load and the content of oil, and satisfactory treated water can stably be obtained, and also, efficiency is high with a small scale. <P>SOLUTION: The organic waste water treatment device comprises: an aerobic treatment tank for treating organic waste water using yeast-containing activated sludge; a solid-liquid separation tank for separating the aerobic treating tank mixed liquid into sludge and treated water; a sludge return tube for returning the sludge separated in the solid-liquid separation tank into an aerobic treatment tank; and an electrolytic cell. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an organic wastewater treatment apparatus.

Activated sludge treatment Conventionally, the treatment of organic wastewater is generally carried out with activated sludge. However, the BOD-SS load for activated sludge treatment is 0.2 to 0.4 kg / kg · day, and high load operation is not possible. Therefore, the apparatus is often increased in size and there is a problem in terms of initial cost. It was. In addition, since the oil cannot be decomposed, in the case of wastewater containing high fat and oil (for example, normal hexane extract substance concentration of 100 mg / L or more), there is also a problem that biological treatment performance is not stable.

Physicochemical treatment + activated sludge treatment On the other hand, by combining physicochemical treatment and activated sludge treatment, wastewater containing high fats and oils can be treated, but because fats and oils are separated by physicochemical treatment, It is necessary to dispose of the separated oil and fat (waste oil froth). This disposal has problems in terms of work and sanitary problems such as waste oil froth being easily spoiled and generating odor. Furthermore, running costs increase because incineration and landfilling are performed. Moreover, although the site area is reduced, the initial cost for performing the physicochemical treatment is increased.

Yeast treatment + activated sludge treatment In yeast treatment, in order to increase the activity of yeast, it was common to add sulfuric acid, hydrochloric acid or the like to the yeast reaction tank and adjust the pH to 3-6. In addition, a method of avoiding competition with activated sludge by adding sodium hypochlorite or the like simultaneously with pH adjustment or alone has been adopted.

  With this combination, it is possible to treat high-concentration organic wastewater and wastewater containing high fats and oils, but due to the characteristics of yeast, there are cases in which the discharge restriction value of public water bodies cannot be satisfied by yeast treatment alone. Even if an activated sludge treatment tank is provided after the yeast treatment, the yeast and microorganisms in the bioreactor are different because the microorganisms in the yeast and activated sludge differ in substrate removal rate, growth rate, and optimum substrate concentration range. The abundance ratio is greatly affected by the properties of the influent water and the fluctuation of the water volume, resulting in unstable treatment performance.

  Moreover, nitrogen could not be removed by the yeast treatment + activated sludge treatment.

  As described above, in order to adjust the pH of the yeast reaction tank to 3 to 6 and maintain the activity of the yeast, it is necessary to continuously add chemicals such as sulfuric acid and hydrochloric acid. The continuous addition of drugs requires a large drug storage tank, and there are problems of installation space and initial cost. In addition, there are problems such as an increase in running cost and attention to handling during storage.

  In addition, when performing advanced treatment with yeast treatment + activated sludge treatment, since yeast does not have a nitrification ability, only a few percent of nitrogen in the influent is removed for cell synthesis, and the remaining nitrogen It was released as it was. Nitrogen removal can be performed by using the activated sludge treatment of the post-treatment as the A2O method or the intermittent aeration method, but a large site area is required and the operation management becomes complicated. Furthermore, there is a problem that it is difficult to perform advanced treatment of wastewater containing TN at a high concentration of 100 to 300 mg / L, such as fishery processing wastewater.

  In addition, when sulfuric acid is added, if there is a site where sludge is anaerobic, sulfate ions are reduced, and hydrogen sulfide is generated, which may cause problems such as odor sources and corrosion of concrete. It was.

  Next, in order to solve the problems of the activated sludge treatment and the yeast treatment at the same time, for example, there is a treatment method in which yeast and activated sludge are mixed as described in JP-A-2000-246284. However, yeast and activated sludge have different substrate removal rates and growth rates, and the optimum concentration range for substrate removal is different, and the optimum concentration range for growth is also different. For this reason, the abundance ratio of yeast and activated sludge in sludge is greatly influenced by the inflowing water state, and it has been difficult to predict in which state it will be stable.

  In addition, basically, the activated sludge growth rate is larger than the yeast growth rate, so the activated sludge often prevails, and there were many cases where the performance during high-load operation became unstable.

  On the other hand, in the conventional treatment method, light sludge components (floating matter) contained in the aerobic treatment tank mixed liquid transferred from the aerobic treatment tank to the solid-liquid separation tank may float on the surface of the solid-liquid separation tank. There are cases where this scum flows into the treated water and causes deterioration of the water quality.

  Moreover, when there is much light sludge, the amount of sludge required cannot be ensured by the outflow of a continuous sludge component, and processing performance may fall.

On the other hand, there is a case where a deaeration tank for removing bubbles adhering to sludge is provided between the aerobic treatment tank and the solid-liquid separation tank. There wasn't.
JP 2000-246284 A

  The object of the present invention is to control optimally according to fluctuations in the load of BOD-SS and the level of oil content, to obtain a stable treated water stably, and to provide an efficient organic on a small scale. It is to provide a wastewater treatment apparatus.

  The organic waste water treatment apparatus of the present invention includes an electrolysis tank that electrolyzes organic waste water, an aerobic treatment tank that treats organic waste water that is aerobic and treated with the electrolytic tank using yeast-containing activated sludge, It consists of a solid-liquid separation tank for separating the aerobic treatment tank mixture into sludge and treated water, and a sludge return pipe for returning the sludge separated in the solid-liquid separation tank to the aerobic treatment tank.

  Alternatively, an aerobic treatment tank for treating aerobic and organic waste water using yeast-containing activated sludge, an electrolytic tank for electrolyzing an aerobic treatment tank mixed solution, and an aerobic treatment tank mixed solution treated in the electrolytic tank And a sludge return pipe for returning the sludge separated in the solid-liquid separation tank to the aerobic treatment tank.

  Alternatively, an aerobic treatment tank that treats organic wastewater aerobically using yeast-containing activated sludge, a solid-liquid separation tank that separates the aerobic treatment tank mixed liquid into sludge and treated water, and the solid-liquid separation tank The sludge return pipe returns the separated sludge to the aerobic treatment tank, and the electrolytic treatment water return pipe returns the electrolytic treatment water treated in the electrolytic tank to the aerobic treatment tank.

  Furthermore, it is desirable that a chemical injector is provided in the sludge return pipe.

  Furthermore, it is desirable that the aerobic treatment tank is provided with a plurality of partitions.

  Furthermore, it is desirable that a levitated substance separation tank for separating levitated sludge is provided.

  Furthermore, it is desirable that a simple sedimentation tank is provided in the aerobic treatment tank.

  Furthermore, it is desirable to provide an anaerobic tank for generating organic acids.

(1) Since the proportion of yeast present in the yeast-containing activated sludge can be adjusted, it is possible to respond freely to changes in wastewater properties such as wastewater concentration and load fluctuations, compared to conventional treatment methods. Will increase.

  In addition, by controlling the treatment of dominant yeast or activated sludge, stable treatment of wastewater containing a high concentration of normal hexane extract (100 mg / L or more) and high load (BOD-SS load is 0). Stable treatment of wastewater can be realized at the same time.

(2) By quantifying the yeast-containing activated sludge with a microscope or fluorescent staining, it is possible to further optimize the operation, and it is possible to automate the adjustment of the chemical addition amount, the air amount and the transfer amount of sewage.

(3) Since the yeast abundance ratio in the yeast-containing activated sludge can be adjusted, the treatment characteristics-treated water quality can be changed by setting, and depending on the target wastewater, the activated sludge portion of the post-treatment becomes unnecessary. Therefore, it is only necessary to provide one aerobic treatment tank and one solid-liquid separation tank, and processing can be performed with a small site area, and the initial cost can be kept low.

  In addition, since the physicochemical treatment is not performed, the initial cost can be kept low, and at the same time, no waste oil froth is generated, so there is no need for running costs for the treatment, and there is no problem of deterioration of working environment or odor. .

(4) When yeast is completely dominated by low pH, it can be utilized that the pH in the aerobic treatment tank is increased by the inflowing water. At the same time, the amount of alkaline agent added to increase the pH on the treated water side can be reduced.

  Moreover, since the floc of yeast containing activated sludge has a large specific gravity and is strong, it has a favorable sedimentation characteristic and the stable process is attained.

(5) When the latter stage of the adjustment tank is used for the neutralization reaction, the amount of chemicals injected, for example, the amount of chlorine added can be made sufficient. For this reason, a reliable inactivation effect can be obtained. In addition, it is not necessary to consider the influence due to the persistence of the inactivation effect, and the operation becomes easy.

(6) Since the yeast-containing activated sludge from which floating substances (light sludge components) that cause scum generation are removed is transferred to the solid-liquid separation tank, it is possible to prevent water quality deterioration due to scum generation in the sedimentation basin. . In addition, the solid-liquid separation property in the solid-liquid separation tank, that is, the sedimentation of the sludge is improved, and the suspended water is not contained in the treated water, so that stable and good treated water can be obtained. Furthermore, since the solid-liquid separation property is good, the returned sludge becomes a sludge with good sedimentation, the microorganism concentration in the aerobic treatment tank can be increased, and high-load operation is possible.

(7) By re-aeration of the levitated matter in the aerobic treatment tank or re-aeration tank, the bubbles adhering to the levitated substance can be eliminated, and the undecomposed substances adsorbed on the levitated substance can be oxidized and decomposed. Not only will it decrease, but the specific gravity of sludge will increase and it will become easier to settle. Therefore, the specific performance of sludge is increased in the solid-liquid separation tank and it becomes easy to settle, so that the sludge flows out continuously from the aerobic treatment tank as floating matter, and the required amount of sludge cannot be secured in the aerobic treatment tank. Can be prevented.

(8) If the levitated matter is excluded from the system as it is, there is no need to oxidize and decompose the undecomposed substances adsorbed on the levitated matter, so that energy consumption can be reduced and sludge in the aerobic treatment tank is good. can do.

(9) By providing a chemical injector for each biological treatment unit, it becomes possible to artificially produce an aerobic treatment tank mixture or sludge suitable for the load and properties of influent water. For example, there are one or more units that appropriately control the biological activity dedicated to high, medium, and low loads, and even if sudden load fluctuations occur, use each load dedicated unit to cope with it. Is possible.

(10) If for some reason the amount of inflow water is less than the planned value in the long term, it will be possible to reduce the number of units used and perform biological treatment, reducing the running costs such as the number of chemicals used in the blower. The effect can also be expected. In addition, even if there is a possibility that the amount of inflow water will increase in the future, it is possible to cope with this by adding more units later. Thus, the burden of initial cost and running cost can be reduced for the customer.

(11) Even when there is no installation space, for example, as shown in FIG.

(12) Compared with a tandem type (series type) unit, when a circle type unit is used, the flow line of the maintenance manager is improved and the maintenance management becomes easier. As a result, it can be expected that detailed maintenance management will be possible.

(13) Even if a phenomenon occurs in which treated water containing yeast-containing activated sludge flows out from the simple sedimentation tank of the unit, it has a structure that can be covered by the subsequent unit, so the final solid-liquid separation tank Finally, it is separated into treated water and sludge, and the final treated water is discharged out of the system. The surplus sludge is transferred to the sludge treatment facility and transferred to the sludge disposal process. Return sludge is adjusted to the ratio of yeast sludge and activated sludge in the sludge with a chemical injector installed in the sludge return pipe, and then returned to each unit as a sludge corresponding to the influent water, and the characteristics of each unit. Can be maintained. Conventionally, there has been a biodiagnosis using a biological index, but it is only a post-evaluation, and it is difficult to immediately respond to sudden inflow load fluctuations. In the present invention, the biological sludge is not captured as a black box, but it is possible to cope with a sudden change in the quality of the influent water by controlling the organisms in the sludge strictly and accurately.

(14) By providing a pH gradient to each unit, the biomass and activity can be controlled.

  By using the difference between the optimum pH range of yeast sludge (pH 3-6) and the optimum pH range of activated sludge (pH 5-8), by changing the pH of the aerobic treatment tank mixture in each unit The biological activity can be controlled by changing the ratio of yeast sludge and activated sludge in the aerobic treatment tank mixed solution in each unit.

(15) The yeast sludge of each unit is not affected by the use of physicochemical means that affect the activity of the activated sludge, such as administration of sodium hypochlorite and antibiotics, without affecting the activity of the yeast sludge. It is possible to control the biological activity by changing the ratio (abundance ratio) between the activated sludge and the activated sludge.

(16) Biological activity can be controlled by providing a sludge concentration gradient to each unit.

  For example, when the influent water quality becomes extremely high, keep the sludge with increased yeast sludge concentration in the previous unit, and decrease the yeast-containing activated sludge concentration in each unit as you go to the subsequent unit. It is possible to keep the load of each unit constant.

(17) Since the target biological activity can be controlled by each unit, it is possible to cope with changes in wastewater concentration and properties due to changes in factory production items.

(18) Since electrolysis can be controlled by the amount of current, operation according to the target water quality is possible.

(19) Since chlorine remains after reacting with ammonia, the addition of a chemical (such as sodium hypochlorite) for adjusting the activity of yeast and activated sludge in the aerobic treatment tank is unnecessary or small.

(20) The operation management is easy because it is only necessary to adjust the current amount and periodically replace the electrode.

(21) Since the amount of sodium hypochlorite or the like (as a drug to be added) is reduced, the capacity of the storage tank is reduced.

(22) The only chemical necessary for electrolysis is a substance that serves as an electrolyte. Since NaCL or the like is used, it is inexpensive and safe. It is also possible to use seawater as the electrolyte.

(23) When a large amount of electrolyte is contained as in fishery processing wastewater, it is not necessary to add an electrolyte (NaCL or the like) again.

(24) Since the treated water is less pollutant such as organic matter and SS than the influent water, most of the generated hypochlorite ions can be used for the oxidation of ammonia nitrogen in the electrolysis treatment of the treated water.

(25) Since the residual chlorine after electrolysis returns to the biological reaction tank by returning a part of the treated water, the addition of sodium hypochlorite or the like becomes unnecessary or small.

(26) Since there is residual chlorine in the treated water, disinfectant addition to the treated water is unnecessary or small.

(27) By returning the treated water, the enzyme (yeast extracellular enzyme) released into the treated water is returned, and the treatment capacity of the biological reaction tank is increased.

(28) Since electrolysis can be controlled by the amount of current, operation according to the target water quality is possible. For example, only the amount of nitrogen necessary for biological treatment can be left.

(29) By treating the organic matter in the inflowing water, the load flowing into the biological reaction tank can be adjusted. By reducing the load, the biological reaction tank capacity can be reduced.

(30) The BOD of treated water was about 200 mg / L only by yeast treatment, and activated sludge treatment was required as a post-treatment for release into public water areas. Since the electrolysis means can treat not only ammonia nitrogen but also organic matter, by providing an electrolytic cell after the aerobic treatment tank-solid-liquid decomposition tank, the post-treatment activated sludge tank can be eliminated.

(31) Further, as shown in FIG. 22, a part of the treated water can be electrolyzed.

(32) As shown in FIG. 23, electrolysis is performed between the aerobic treatment tank and the solid-liquid decomposition tank. By electrolyzing the aerobic treatment layer mixed solution after the aerobic treatment tank, the sludge (negatively charged) charge is neutralized and it becomes easy to form a floc. As a result, the sedimentation property is improved.

(33) In order to increase the activity of the yeast, the pH is adjusted to 3-6. For this adjustment, sulfuric acid, hydrochloric acid or the like is not added to the aerobic treatment tank, or a small amount is sufficient. A storage tank, a chemical solution addition device, etc. are unnecessary or small-scale, and the initial cost can be reduced.

  Moreover, since it is not necessary to continuously add chemicals, the running cost can be reduced.

(34) Conventionally, when sulfuric acid is added to adjust the pH to 3 to 6, if there is a site where the sludge becomes anaerobic, sulfate ions are reduced and hydrogen sulfide is generated, which may be a source of malodor, In some cases, such as corrosion, may occur. However, since sulfuric acid is not used or only a small amount is required, generation of malodor and corrosion of concrete can be prevented.

(35) Moreover, in the structure shown in FIG. 26, the reduction | decrease of excess sludge can also be expected.

  The reaction tank and the precipitation tank in the present invention will be described with reference to the drawings.

  1 to 5 are schematic configuration diagrams showing an embodiment of the organic waste water treatment apparatus of the present invention. 6 to 9 are schematic configuration diagrams showing an embodiment of the organic waste water treatment apparatus of the present invention, and show the configuration of the aerobic treatment tank. 10 to 12 are schematic configuration diagrams showing an embodiment of the organic waste water treatment apparatus of the present invention. 13 and 14 are schematic configuration diagrams showing an embodiment of the biological treatment unit. 15 to 19 are schematic configuration diagrams showing different embodiments of the configuration of the biological treatment unit. FIG. 20 to FIG. 23 are schematic configuration diagrams showing an embodiment in which an electrolytic cell is used. FIG. 24 to FIG. 26 are schematic configuration diagrams showing an embodiment when an anaerobic tank is provided.

(1) Components
Biological treatment unit The biological treatment unit comprises an aerobic treatment tank and a simple sedimentation tank.

  In the biological treatment unit shown in FIG. 13, the aerobic treatment tank and the simple sedimentation tank are independent structures. In the biological treatment unit shown in FIG. 14, the aerobic treatment tank and the simple precipitation tank are separated by a partition plate. Structure. The bottom of the partition plate is open and serves as a transfer tube. As shown in FIGS. 15 to 19, by combining a plurality of biological treatment units, it becomes possible to quickly cope with fluctuations in the amount of influent water and sudden changes in water quality, and yeast sludge for each biological treatment unit. It becomes possible to artificially control the abundance ratio between activated sludge and activated sludge.

  In addition to the biological treatment unit composed of the aerobic treatment tank and the simple sedimentation tank, the biological treatment means and the solid-liquid separation means may be combined.

  Further, for example, pH adjustment means can be implemented in the aerobic treatment tank, the simple sedimentation tank, the inflow line (including the tank structure related to inflow), or the sludge return pipe (including the tank structure related to return), That is, as a result, a chemical injector capable of artificially controlling the growth of yeast or suppressing the growth of activated sludge is provided.

In the simple sedimentation tank , any method may be used as long as the sludge in the aerobic treatment tank mixed liquid transferred from the aerobic treatment tank can be separated from the liquid layer and the separated sludge can be returned.

The solid-liquid separation tank solid-liquid separation tank can solid-liquid separate the sludge in the aerobic treatment tank mixed liquid and return the sludge in the same manner as the simple sedimentation tank. For example, a gravity precipitation tank, a screen separation device, a centrifugal separation device, a filter cloth separation device, a belt traveling separation device, or the like can be used.

The aerobic treatment tank The aerobic treatment tank is a reaction tank having a mixed microorganism group of activated sludge and organic substance-utilizing yeast. If it is a material which can respond to low pH, a general reaction tank can be utilized.

  The yeast used in the aerobic treatment tank may be any genus as long as it can assimilate organic matter. For example, yeasts such as Trichosporon, Candida, Hansenula, Saccharomyces, and Kluyveromyces can be used.

  As shown in FIGS. 6 to 9, the aerobic treatment tank is preferably provided with a plurality of partitions. With this configuration, the biological activity is controlled, and the activity of the organic substance-assimilating yeast is high in the former stage, and the activity of the activated sludge can be increased as it goes to the latter stage.

In the aerobic treatment tank, an aeration means for aerating the inside of the tank is provided. Any diffuser can be used as long as the inside of the tank can be maintained at an appropriate DO (dissolved oxygen) concentration during the aeration process. For example, a multistage diffuser, a disk diffuser, a cylindrical diffuser, a draft tube diffuser, etc. can be used. The air diffuser is connected to a blower that sends air to the air diffuser.

  The blower connected to the air diffuser may be provided in common for the plurality of air diffusers. In a plurality of biological treatment units, it is also possible to stop the aeration means of the unused units.

Sludge return pipe The sludge return pipe returns a part or all of the sludge separated from the treated water in the solid-liquid separation tank to the aerobic treatment tank. In the present invention, as shown in FIGS. 1 to 9, sterilization treatment and / or pH adjustment is performed on the return sludge distributed to the sludge return pipe. In addition, as shown in FIG. 4, if necessary, different sludge return pipes may be provided to inject chemicals and return sludge so that the yeast-containing activated sludge is not damaged.

The chemical injector is provided in the middle of the sludge return pipe or in the tank, and adjusts the biological activity of the returned sludge and injects a chemical for maintaining the balance of the biological activity inhabiting the aerobic treatment tank. An in-line mixer such as a static mixer can be used, but the form is not limited as long as the amount of chemical injection can be controlled. Mainly using chemical methods of adding chemicals such as acid, alkali or disinfectant, hydrogen peroxide, ozone, sludge volume reducing agent, but physical methods such as electrolysis, ultrasonic, heating, crushing It is also possible to replace it with a device that uses

As long as the control equipment chemical injector can be controlled, the form is not limited, such as using a general-purpose computer. Using quantitative and direct data such as the ratio between the amount of yeast and activated sludge in the aerobic treatment tank and the oxygen utilization rate, the chemical injection amount is controlled to maintain the balance of these activities in the aerobic treatment tank. To do. There is also a method of indirectly setting a chemical injection amount based on pH, dissolved oxygen concentration, etc. of an aerobic treatment tank, a control tank, and the like. Furthermore, in addition to the chemical injector, it is preferable to be able to manage adjustments such as the amount of air in aeration, the amount of sewage transferred, and the amount of returned sludge.

By providing the adjustment tank in the middle of the adjustment tank sludge return pipe, the return sludge and the chemical are reacted by stirring, and a reaction region having a good effect of the bactericide can be obtained. In addition, aeration can be performed in the adjustment tank to oxidize the substrate attached to the yeast. Furthermore, you may provide multiple adjustment tanks.

Floating matter separation tank As shown in FIGS. 10 to 12, by providing a floating matter separation tank that separates the floating substance contained in the aerobic treatment tank mixed liquid, sludge with bubbles attached thereto and undecomposed oil droplets are removed. The levitated matter that is the sludge that has been embraced can be separated, and only the settled aerobic treatment tank mixed liquid can be transferred to the solid-liquid separation tank. Thereby, scum generation in the solid-liquid separation tank is prevented, and the separation characteristics of the solid-liquid separation tank are improved.

  The levitated material is re-aerated as necessary and returned to the processing system, or is excluded from the system as shown in FIG.

Re-aeration tank As shown in FIG. 11, by providing a re-aeration tank, it is possible to decompose the undecomposed oil droplets entrained by the levitated substance or break the attached bubbles.

Anaerobic tank As shown in FIG. 24 to FIG. 26, by providing an anaerobic tank, part or all of the organic matter in the inflowing water undergoes anaerobic fermentation to produce an organic acid, and this organic acid is used in place of conventional sulfuric acid or hydrochloric acid. Can be used.

  In order to increase the activity of the yeast, the pH is adjusted to 3-6. For this adjustment, sulfuric acid or hydrochloric acid is not added to the aerobic treatment tank, or a small amount is sufficient. A chemical addition device or the like is unnecessary or small-scale, and the initial cost can be reduced. Moreover, since it is not necessary to continuously add chemicals, the running cost can be reduced.

  Conventionally, sulfuric acid is added to adjust the pH to 3 to 6, and if there is a site where the sludge becomes anaerobic, sulfate ions are reduced and hydrogen sulfide is generated, which becomes a source of malodor and corrodes concrete. However, since sulfuric acid is not used or a small amount is sufficient, it is possible to prevent generation of malodor and corrosion of concrete.

  Moreover, in the structure shown in FIG. 26, reduction of excess sludge can also be expected.

(2) pH adjustment / chlorine addition In one aspect of the organic wastewater treatment apparatus of the present invention, as shown in FIGS. 1 to 5, an aerobic treatment tank for treating organic wastewater and an aerobic treatment tank. It consists of a solid-liquid separation tank that separates the mixed liquid into sludge and treated water, and a sludge return pipe that returns sludge, wherein the aerobic treatment tank is an aerobic treatment tank using yeast-containing activated sludge, and A sludge return pipe is provided with a chemical injector.

  The optimum pH of yeast is 3-6, and the optimum pH of activated sludge is 5-8. Usually, the growth rate of yeast is smaller than that of activated sludge, so that activated sludge is often dominant when pH adjustment is not performed. Yeast is resistant to chlorine, but activated sludge is not resistant to chlorine.

  Therefore, damage (inactivation) can be selectively imparted to the activated sludge in the sludge in which yeast and activated sludge are mixed by adjusting the pH and adding chlorine. Further, the amount of activated sludge can be controlled by the degree of damage. In addition, the activated sludge may be selectively damaged by the addition of potassium metabisulfite.

  In the present invention, as shown in FIGS. 1 to 5, as a means for killing and inactivating activated sludge, a chemical injector is provided in the sludge return pipe, the pH is adjusted by directly injecting the chemical into the sludge return pipe. Or sterilize. This is because the chemical is not injected into the aerobic treatment tank, and even if a sufficient amount of chemical is injected into the sludge return pipe, it is transferred to the aerobic treatment tank after mixing with the sludge. The influence of chemicals on the biological activity in the tank can be reduced.

  The pH adjustment of the aerobic treatment tank is performed as necessary when the pH of the influent water exceeds 7 or when the pH of the influent water is less than 4. As the pH adjuster, sulfuric acid, sodium hydroxide or the like is used, and any chemical can be used as long as it does not inhibit the growth of microorganisms.

  Furthermore, as shown in FIGS. 2 to 5, an adjustment tank may be provided in the sludge return pipe, and sufficient stirring may be performed. Thereby, sufficient pH adjustment and / or sterilization treatment can be performed. You may provide multiple adjustment tanks as needed. Moreover, when an adjustment tank is provided, aeration may be performed in the adjustment tank to oxidize the substrate adsorbed on the yeast.

  Furthermore, if necessary depending on the properties of the influent water, pretreatment such as removal of contaminants and dispersion of oil is performed in the previous stage of the aerobic treatment tank.

  The sludge after being separated from the treated water in the solid-liquid separation tank is distributed to the sludge return pipe and the discharge pipe according to the inflow situation and the treatment target. The return sludge distributed to the sludge return pipe can be lowered to a pH of around 4 by the above-described chemical injector and adjustment tank. Thereby, the activated sludge in the returned sludge is killed or inactivated.

  Moreover, as shown in FIG. 4 and FIG. 5, a different sludge return pipe is provided, sludge is returned, and the yeast-containing activity is not adjusted for the yeast-containing activated sludge of this route without adjusting pH or adding chlorine. It is also possible to adjust the balance of biological activity in the aerobic treatment tank so that the sludge is not damaged.

  Furthermore, although not illustrated, the amount of nitrite bacteria may be adjusted by adding allylthiourea or the like with a different sludge return pipe, if necessary. As a result, the pH can be excessively lowered or COD can be taken as a countermeasure.

  Next, in the organic waste water treatment apparatus of the present invention, as a means for inactivating the yeast-containing activated sludge, the return sludge is sterilized with a chlorine-based chemical. Addition of chlorinated chemicals oxidizes fatty acids that are abundant in the cell walls of bacteria and sterilizes because the cell walls have holes. Therefore, the activated sludge in the yeast-containing activated sludge is inactivated. However, since chitin, chitosan, glucan and mannan are the main constituents of the cell wall of yeast, it is difficult to oxidize with chlorine, and yeast is not inhibited with chlorine.

  Thereby, the yeast content in the yeast containing activated sludge in an aerobic processing tank can be changed freely. For example, when the load of influent water is high or when high-concentration normal hexane extract is included, increase the amount of chlorine added to increase the yeast content. Reduce the amount of chlorine added to reduce the amount. Therefore, the balance of the biological activity in the aerobic treatment tank can be freely coped with the load fluctuation.

  The sterilization treatment with chlorine is performed by injecting a chlorine-based sterilizer such as sodium hypochlorite from a chemical injector.

(3) Aerobic treatment The returned sludge is inactivated by adjusting the pH and / or adding chlorine in the sludge return pipe. In the previous stage of the aerobic treatment tank into which such return sludge is introduced, the pH is optimum (3 to 6) of yeast, and the activated sludge is inactivated by the addition of chlorinated chemicals. Can handle the influent water with high concentration. In the case of a plurality of aerobic treatment tanks divided into a plurality of tanks, the pH changes to the optimum pH (5 to 8) of the activated sludge as it goes to the subsequent stage, and the chlorine concentration decreases, The main treatment is activated sludge, which makes it possible to treat almost all BOD that cannot be treated by yeast-dominated treatment.

  The aerobic treatment tank may be a single tank or a plurality of tanks depending on the quality of the inflow water and the amount of water.

  In the case of a plurality of aerobic treatment tanks divided into a plurality of tanks, in order to more precisely adjust the biological activity in each tank, the chemical injectors can be aerobic treatment tanks so that chemicals can be injected into each tank. May be provided. By injecting a bactericidal agent and / or a pH adjusting agent from a chemical injector, it is possible to adjust the bactericidal agent and / or pH optimum for the organism to be dominant in each tank. Therefore, it is preferable to control the chemical injector provided in each tank.

(4) Configuration Example of Biological Treatment Unit FIG. 15 shows an arrangement in which four biological treatment units in which an aerobic treatment tank and a simple precipitation tank are independent are connected in series. The inflow water flows into the aerobic treatment tank, where the aerobic treatment tank mixture is transferred to the simple sedimentation tank after the biological treatment is performed. Solid-liquid separation into sludge part. At this time, solid-liquid separation may not be completely performed, and treated water containing a certain amount of SS component is handed over to the next unit, and biological treatment is performed. The sludge separated into solid and liquid enters the sludge return pipe and is returned to the aerobic treatment tank. A chemical injector is installed in the middle of this sludge return pipe, where the abundance ratio of yeast sludge and activated sludge is artificially adjusted, and the bioactivity is appropriately controlled to the aerobic treatment tank of each unit. Will be returned. The sludge return pipe may be not only a cylindrical pipe but also a quadrangular prism as long as it can return and divert to one or a plurality of units. In addition, it is suitable for various types of wastewater by changing the number of units used according to the amount of influent or treated water and load fluctuations, or by diverting influent, treated water, and return sludge to each unit. Biological treatment becomes possible. In the final settling tank, the treated water portion and the sludge portion are separated into solid and liquid, and the treated water is discharged out of the system. The sludge separated from the treated water is returned to each unit. However, a chemical injector is provided in the middle of the return, and after adjustment is made so that the biological activity is appropriate for each unit, the sludge is diverted and returned.

  The sludge in the simple sedimentation tank is returned to the aerobic treatment tank of the unit. Furthermore, the sludge in the simple sedimentation tank can be combined with the returned sludge from the solid-liquid separation tank and distributed to another unit. This is a structure in which several units can be operated under one operating condition to cope with variations in inflow and load. Similarly, in FIGS. 16 to 19, the sludge in the solid-liquid separation tank and the sludge in the simple sedimentation tank can be freely distributed to each unit.

  However, the sludge return pipe and the chemical injector need not be provided for each unit depending on the influent water quality and the control method. For example, when inflow water is not put into the unit on the way, it is only necessary to provide a chemical injection pipe first.

  FIG. 16 and FIG. 15 use different biological treatment units. Even if the solid-liquid separation property of each biological treatment unit is lowered, it does not become a big problem. Therefore, if an apparatus having a structure like the biological treatment unit as shown in FIG. It leads to reduction of initial cost.

  FIG. 17 can also be configured such that in each biological treatment unit, the simple sedimentation tank is positioned diagonally so that fluid flows between the biological treatment units in a staggered manner.

  In FIG. 18, even the same four biological treatment units can be configured in a circle shape. This makes it possible to receive the incoming water once in the distribution means and distribute the incoming water anywhere in each biological treatment unit. In FIG. 18, inflow water was made to flow into the place located in the diagonal of the simple sedimentation part of each biological treatment unit. In this case, the fluid flow of the whole biological treatment unit is counterclockwise. The merit of this embodiment is effective when it cannot be installed vertically. In addition, when considering the flow of the operation and maintenance manager of the facility, it can be said that it is more efficient in terms of maintenance than vertical.

  FIG. 19 shows an example in which a plurality of units used in FIG. 17 are connected in a modification of the biological treatment unit shown in FIG. (A) shows that system 1 and system 2 are independent of each other. For example, when operating with system 1 alone, the inflowing water is divided into units of system 2 as indicated by the dashed arrows due to load fluctuations. It is also possible to have a note. (B) is a combination of a plurality of circle-type units shown in FIG. As indicated by the broken arrow, it is possible to dispense inflow water according to load fluctuations, adjust the load appropriately, and perform biological treatment.

(5) Electrolysis (sterilization)
Moreover, it is also possible to generate chlorine by electrolysis in the sludge return pipe and the adjustment tank. Since fishery processing wastewater and pickled factory wastewater have a high chlorine ion concentration, chlorine can be efficiently generated by electrolysis. The generation process of chlorine by electrolysis is as follows.

When salt water is electrolyzed, chlorine (Cl ₂ ) is generated at the anode (positive electrode).

(i) 2Cl ⁻ → Cl ₂ + 2e ⁻
The form of generated chlorine (Cl ₂ ) changes depending on the pH of the solution, and chlorine (Cl ₂ ) is mainly used in the acidic region, and hypochlorite (HClO) and hypochlorite ions (ClO ⁻ ) are mainly used in the neutral region. Become an ingredient. In the acidic region, a part of chlorine (Cl ₂ ) is dissolved in the solution, but is discharged out of the system as chlorine gas. Specifically, it depends on the following equilibrium reaction.

(ii) Cl ₂ (chlorine) + H ₂ O ＨＣｌ HClO (hypochlorous acid) + H ⁺ + Cl ⁻
(iii) HClO (hypochlorous acid) ⇔ H ^{+ +} ClO ^- (hypochlorite)
Incidentally, the “effective chlorine concentration” used as an indicator of bactericidal properties is the total concentration of chlorine (Cl ₂ ), hypochlorous acid (HClO) and hypochlorite ions (ClO ⁻ ) in the solution.

In actual electrolysis, oxygen (O ₂ ) is generated as a competitive reaction of the chlorine (Cl ₂ ) generation reaction of (i).

(iv) H ₂ O ⇒ 1 / 2O ₂ + 2H ⁺ + 2e ⁻
Since hypochlorous acid generated by electrolysis remains as residual chlorine, the activity of yeast and the activity of activated sludge can be adjusted by returning the treated water and flowing it into the aerobic treatment tank. The oxidizing power of hypochlorous acid is also used for oxidation treatment and disinfection of organic substances.

(6) Electrolysis (nitrogen removal)
In the present invention, high-concentration organic matter and oil are treated with yeast-containing activated sludge. The aerobic treatment tank mixed liquid containing the yeast-containing activated sludge is separated into sludge and treated water in a solid-liquid separation tank. When the separated treated water is electrolyzed in an electrolysis tank, hypochlorite is generated because the treated water contains electrolytes such as chloride ions. Hypochlorous acid reacts with ammonia nitrogen in the treated water and oxidatively decomposes to remove ammonia nitrogen contained in the treated water. In the removal of ammonia nitrogen by electrolysis, electrons are released by supplying electric energy to a solution in which chloride ions are separated, and chlorine is generated. When this reacts with water, hypochlorite ions are generated and ammonia is oxidized by the oxidizing power to be denitrified. The following is the chemical reaction formula of ammonia nitrogen by electrolysis.

Cl ₂ + H ₂ O => HClO + HCl
2NH ₃ + 3HClO ⇒ N ₂ ↑ + 3H ₂ O + 3HCl
From these,
3Cl ₂ + 2NH ₃ + 3H ₂ O => N ₂ ↑ + 3H ₂ O + 6HCl
Hypochlorous acid generated by electrolysis remains as residual chlorine, so return the treated water and flow into the aerobic treatment tank, or put it into the sludge return pipe, or put it into the adjustment tank. The activity of activated sludge can be adjusted. The oxidizing power of hypochlorous acid is also used for oxidation treatment and disinfection of organic substances.

  When the electrolyte is insufficient in the treated water, a necessary amount of chemicals that become an electrolyte such as sodium chloride is added to the electrolytic cell.

(7) Organic acid fermentation In an anaerobic tank, organic substances are hydrolyzed by the action of hydrolysis / acid-producing bacteria, and soluble organic substances produced by hydrolysis are converted to organic acids by the action of hydrolysis / acid-producing bacteria. Converted.

  The following conditions are recommended for the production of organic acids in an anaerobic tank.

Using the apparatus of FIG. 25, the pH of the anaerobic tank is 6.3 to 8.5, the input alkalinity is about 3500 (mgCaCO ₃ / L), the ORP is −300 to −350 mV, and the water temperature is 35 ° C. (10 ° C. to 45 ° C. ) When operated at SRT for 20 days, an organic acid conversion rate (organic acid concentration / input substrate concentration) of 59% was obtained. In the concentration of organic acid according to composition, the ratio of acetic acid was large and was 40% or more. Thereby, the amount of chemicals used for pH adjustment can be reduced, and furthermore, the generation of malodor can be prevented because sulfuric acid can be made small.

  The chemical | medical agent for inactivation of the activated sludge by disinfection is not limited to chlorine, For example, hydrogen peroxide, ozone, or a sludge volume reducing agent etc. can also be used. In addition to chemicals, ultrasonic waves, heating, crushing, electrolysis, and the like can also be used.

  Alternatively, nitrite bacteria can be sterilized by changing the chemical ratio of the nitrite bacteria in the aerobic treatment tank, changing the chemicals injected from the chemical injector, or providing different sludge return pipes and adding allylthiourea, etc. Therefore, it is possible to prevent the pH from being lowered or to prevent the COD from becoming high due to nitrous acid.

  In the organic wastewater treatment apparatus of the present invention, in the treatment with yeast-containing activated sludge, by using an index that quantifies the amount of yeast and activated sludge, the amount of chemicals added, the amount of air, the inflow that has been empirically performed conventionally Adjustment of quantity etc. can be managed quantitatively. This also allows for optimal operation of the device.

  The ratio between the amount of yeast and the amount of activated sludge in the aerobic treatment tank measured by the following means can be used as a quantified index.

  -By microscopic observation, count the number of yeast and activated sludge, and use the ratio as a quantified index.

  -Fluorescent staining of yeast and activated sludge separately, measure each amount by image processing, and use the ratio as a quantified index.

  ・ For the activated sludge containing yeast, measure the oxygen utilization rate for each of the untreated sample and the sample whose pH was adjusted and chlorine was added to deactivate the activated sludge, and the obtained oxygen utilization rate was quantified. Index.

  These indicators may be used in combination. In addition to these indicators, any indicators can be used as long as they can distinguish and express their amounts and activities depending on the difference between the properties of yeast and activated sludge. An aerobic treatment tank is desirable as a sample collection place, but return sludge after adjustment may be collected.

  For example, by inputting these indexed data into the control facility, the amount of chemical injection controlled by the control facility can be managed quantitatively, and thereby the pH adjustment and the chlorine addition amount can be appropriately changed. . Such quantified operation management makes it possible to automate the adjustment of the sludge return amount, the inflow water amount, and the like, thereby saving labor. Furthermore, since the state of the aerobic treatment tank at each time point can be quantitatively grasped, it becomes possible to easily cope with load fluctuations.

(Example 1)
As shown in FIG. 1, an organic material comprising an aerobic treatment tank for aerobic treatment, a solid-liquid separation tank for separating the aerobic treatment tank mixed liquid into sludge and treated water, and a sludge return pipe for returning sludge. In the wastewater treatment apparatus, the aerobic treatment tank is an aerobic treatment tank using yeast-containing activated sludge, the sludge return pipe is provided with a chemical injector, a static mixer is used as the chemical injector, pH and Sodium chlorite was controlled by addition time.

  Since the oil-containing wastewater was targeted, the yeast ratio in the yeast-containing activated sludge was increased, and the activated sludge was damaged. That is, the addition time of the pH adjusting agent was increased so that the pH was close to 7 to 4, and the addition time of sodium hypochlorite was also increased.

  As a result, good and stable treated water quality could be obtained.

  Furthermore, as shown in FIG. 2, the chemical injector was provided with one adjusting tank, and the time for adding the pH adjuster and the time for adding sodium hypochlorite were adjusted. As a result, a stable treated water quality was obtained as described above.

  Moreover, as shown in FIG. 3, the chemical | medical injector was provided with two adjustment tanks, the pH adjustment tank added and reacted with the pH adjuster, and the adjustment tank added and mixed with sodium hypochlorite. . As a result, a stable treated water quality was obtained as described above.

  When a pH adjustment tank for neutralization reaction is provided as in this example, the amount of added chlorine can be made sufficient. For this reason, a reliable inactivation effect can be obtained. In addition, it is no longer necessary to consider the effect of the inactivation effect, and the operation is further facilitated.

(Example 2)
As shown in FIG. 4, an organic material comprising an aerobic treatment tank for aerobic treatment, a solid-liquid separation tank for separating the aerobic treatment tank mixed liquid into sludge and treated water, and a sludge return pipe for returning sludge. In the wastewater treatment apparatus, the aerobic treatment tank is an aerobic treatment tank using yeast-containing activated sludge, the two sludge return pipes are provided, and one of the sludge return pipes is provided with two adjustment tanks. In the pH adjustment tank, a pH adjusting agent was added and mixed in the pH adjusting tank. In the adjusting tank, sodium hypochlorite was added and mixed.

  In addition, the adjustment tank which receives the returned sludge from the solid-liquid separation tank performs addition of sodium hypochlorite, and the pH adjustment tank which receives the sludge from the adjustment tank adjusts the pH. However, when the outflow water from the solid-liquid separation tank is acidic, the pH can be adjusted in the adjustment tank. In addition, if the effluent from the pH adjustment tank is returned to a tank with a high yeast ratio, the pH adjustment may be slight or not, but if it is returned to a tank with a large activated sludge ratio, the pH may be adjusted. good.

  Since wastewater containing high-concentration organic matter was targeted, the yeast ratio of the yeast-containing activated sludge was increased, so that the activated sludge was damaged. That is, the addition operation time of the pH adjusting agent was increased so that the pH was close to 7 to 4, and the addition time of sodium hypochlorite was also increased. Furthermore, since chemicals are not injected into the other sludge return pipe, the activated sludge will not be damaged, and the yeast ratio in the aerobic treatment tank should be set to the set value by the return amount from each sludge return pipe. Was easy.

  As a result, good and stable treated water quality could be obtained.

  In this example, although there were two adjustment tanks, as shown in FIG. 5, when adjusting the time for adding the pH adjusting agent and the time for adding sodium hypochlorite as one adjustment tank. As described above, more stable treated water quality was obtained.

(Example 3)
The procedure was the same as in Example 2 except that the operation was performed to reduce the damage of activated sludge in order to increase the activated sludge ratio in the aerobic treatment tank sludge for wastewater with a low load. That is, in order to reduce the sodium hypochlorite addition mixing reaction which is a disinfectant, the distribution ratio to the said adjustment tank was reduced and the addition amount of the chemical | medical agent was adjusted. Furthermore, the ratio of the pH addition mixing reaction was reduced, and the pH was brought closer to 4-7.

  As a result, good and stable treated water quality could be obtained, and since the inflow water had a low BOD concentration, nitrogen nitrification could be performed well.

Example 4
Using the apparatus shown in FIG. 5, first, sulfuric acid, which is a chemical for pH adjustment, is added to the adjustment tank to adjust to a predetermined pH shown in Table 1, and then sodium hypochlorite is added to add Table 1. It was operated as a predetermined chlorine concentration shown in FIG.

  When a BOD / SS load of 0.8 to 1.2 (kg / kg) is a treatment target, the pH is 4 to 5, and sodium hypochlorite is 20 to 30 mg / Cl / L as the concentration in the target water. ) Was added. The ratio of the sludge return amount was 80 to 100% for the sludge return pipe A on the side where the adjustment tank was laid, and 0 to 20% for the sludge return pipe B on the side of the sludge return pipe alone.

  When a BOD / SS load of 0.5 to 0.8 (kg / kg) is a treatment target, the pH is 5 to 6, and sodium hypochlorite is a concentration in the target water of 5 to 20 (mg-Cl / L). ) Was added. The ratio of the sludge return amount was 60 to 80% for the sludge return pipe A on the side where the adjustment tank was laid, and 20 to 40% for the sludge return pipe B only on the sludge return pipe side.

  When a BOD / SS load of 0.2 to 0.5 (kg / kg) is treated, the pH is 6 to 7, and sodium hypochlorite is 5 (mg-Cl / L) or less in the target water. Was added. The ratio of the sludge return amount was 40 to 60% for the sludge return pipe A on the side where the adjustment tank was laid, and 40 to 60% for the sludge return pipe B on the side of the sludge return pipe alone.

  As a result, in the aerobic treatment tank, since the yeast content in the yeast-containing activated sludge could be freely changed, when the load is high, the amount of added chlorine is increased so that the yeast content increases, The amount of sludge returned was also reduced so that the sludge was returned as it was to damage the activated sludge. On the other hand, when the load is low, the amount of chlorine added is reduced so that the yeast content is reduced, and the amount of sludge returned is also increased on the side that returns the sludge as it is so as not to damage the activated sludge. did. As described above, it was possible to respond to load fluctuations freely.

(Example 5)
Using the apparatus shown in FIG. 6, the difference between the optimum pH of yeast (3-6) and the optimum pH of activated sludge (5-8) was utilized.

  Sulfuric acid was used as the chemical to be injected, and the pH of the return sludge was adjusted to 3. The aerobic treatment tank was divided into four tanks, and a pH meter was installed in each tank.

  Table 2 shows the pH of each partitioned tank, the BOD concentration (mg / L) of the supernatant of the outlet of each tank, and the average value (mg / L) of the normal hexane extractable substance in fishery processing wastewater treatment. It was. In addition, the number of partitions is free according to the amount of inflow water. In addition, although a plurality of pH meters are installed, it can be measured by a charging type because of cost.

  In the first and second tanks in the optimum pH range (3 to 6) of yeast, the normal hexane extract (n-Hex) was treated to 22 (mg / L), and the optimum pH of activated sludge ( BOD was removed to 31 (mg / L) in the third and fourth tanks corresponding to 5-8).

(Example 6)
Using the apparatus shown in FIG. 7, the difference in chlorine resistance between yeast and activated sludge was utilized.

  Sodium hypochlorite was used for the chemical injector, and adjusted to 5-50 (mg-Cl / L) as effective chlorine with respect to the amount of returned sludge.

  Yeast is resistant to chlorine, and when adjusted to 50 (mg-Cl / L), activated sludge mainly loses its activity, so by changing it to 5-50 (mg-Cl / L), the yeast It is the main biota and can handle influent water with high concentration. After that, when chlorine became thinner in the third and fourth tanks, activated sludge became the main biota, and water treated to some extent with yeast could be treated in the same manner as in Example 6.

(Example 7)
Using the apparatus shown in FIG. 8, pH control was performed even in an aerobic treatment tank.

  In order to adjust the biological activity of each tank more strictly, chemical injectors were also provided in each of the tanks separated from the aerobic treatment tank. Each tank was provided with a pH controller. As chemicals, sulfuric acid and sodium hydroxide were added to adjust the pH to be optimal for the organism to be dominant.

  Although the fishery processing waste water used in Example 5 was processed, the processing corresponding to a water quality change was performed and the favorable treated water quality was obtained.

(Example 8)
Using the apparatus shown in FIG. 9, the returned sludge after passing through the chemical injector was distributed to each tank.

  The pH and chlorine concentration of each partitioned tank were adjusted to conditions suitable for the dominant microorganism.

  In a tank that returned a large amount of returned sludge with an optimum pH (3 to 6) of yeast, yeast was the main biota and could cope with influent water with a high BOD concentration. Moreover, the return sludge of the optimal pH (5-8) of activated sludge was returned with respect to inflow water with a low density | concentration.

  In other tanks, return sludge with sodium hypochlorite added to 50 (mg-Cl / L) so that yeast resistant to chlorine becomes the main biota, and BOD concentration In response to high influent water, sodium hypochlorite was added to 5 (mg-Cl / L) so that activated sludge becomes the main biota for low concentration influent water. Returned the returned sludge.

  Although the fishery processing waste water used in Example 5 was processed, the processing corresponding to a water quality change was performed and the favorable treated water quality was obtained.

Example 9
The apparatus shown in FIG. 10 was used. The influent water was introduced into the aerobic treatment tank and aerated with the yeast-containing activated sludge. The aerobic treatment tank mixed solution that was aerobically treated in the aerobic treatment tank was pushed out by the inflowing water and introduced into the floating substance separation tank.

  In the levitated substance separation tank, the aerobic treatment tank mixed liquid from the aerobic treatment tank was kept static, and the levitated substance (light sludge component) was separated by the difference in specific gravity. In the solid-liquid separation tank, the aerobic treatment tank mixed liquid from which the levitated material was separated and removed was transferred, scum generation was prevented, and separation of the solid-liquid separation tank was improved.

  The levitated substance is transported from the levitated substance separation tank to the aerobic treatment tank, so that bubbles are attached or undegraded oil droplets are embraced, but it is aerated again in the aerobic treatment tank. As a result, bubbles adhering to the sludge particles were removed, the oil was oxidized and decomposed, the specific gravity was increased, and it was easy to settle.

(Example 10)
The apparatus shown in FIG. 11 was used. The influent water was introduced into the aerobic treatment tank and aerated with the yeast-containing activated sludge. The aerobic treatment tank mixed solution that was aerobically treated in the aerobic treatment tank was pushed out by the inflowing water and introduced into the floating substance separation tank.

  The levitated substance separation tank kept the aerobic treatment tank mixed solution from the aerobic treatment tank static, and separated the levitated substance (light sludge component) by the specific gravity difference. In the solid-liquid separation tank, the aerobic treatment tank mixed liquid from which the levitated material was separated and removed was transferred, scum generation was prevented, and separation of the solid-liquid separation tank was improved.

  The levitated substance was transferred from the levitated substance separation tank to the re-aeration tank, so that bubbles were attached or undegraded oil droplets were embraced, but it was introduced into the re-aeration tank and concentrated again. By aeration treatment, air bubbles attached to the sludge particles are removed or oil is oxidatively decomposed and then transferred to the aerobic treatment tank, so that the specific gravity of the sludge in the aerobic treatment tank increases and sludge tends to settle. Increased.

(Example 11)
The apparatus shown in FIG. 12 was used. The influent water was introduced into the aerobic treatment tank and aerated with the yeast-containing activated sludge. The aerobic treatment tank mixed solution that was aerobically treated in the aerobic treatment tank was pushed out by the inflowing water and flowed into the floating substance separation tank.

  The levitated substance separation tank kept the aerobic treatment tank mixed solution from the aerobic treatment tank static, and separated the levitated substance (light sludge component) by the specific gravity difference. In the solid-liquid separation tank, the aerobic treatment tank mixed liquid from which the levitated material was separated and removed was transferred, scum generation was prevented, and separation of the solid-liquid separation tank was improved. In addition, in order to accelerate | stimulate isolation | separation to a levitated substance separation tank, you may stir gently and in order to prevent accumulation of unnecessary sludge, you may mix intensively by a fixed space | interval.

  The levitated substance is removed from the levitated substance separation tank as it is, and is returned to the aerobic treatment tank, or aerobic treatment tank is returned to the aerobic treatment tank. The yeast-containing activated sludge in the treatment tank was improved.

Example 12
In the configuration shown in FIG. 20, fishery processing wastewater was treated using the apparatus of the present invention. Table 3 shows the results.

  The electrolyte was decomposed to generate hypochlorous acid, and ammonia in the treated water was decomposed to remove nitrogen and remove CODcr. Furthermore, the activity of yeast and activated sludge in the aerobic treatment tank could be adjusted by returning residual chlorine remaining in the effluent from the electrolytic tank to the aerobic treatment tank. Alternatively, the activity of yeast and activated sludge could be adjusted in the same manner by putting it in the sludge return pipe.

  Alternatively, as shown in FIG. 22, hypochlorous acid is also generated by electrolyzing part of the treated water, ammonia in the treated water is removed, and the removed treated water is put into the aerobic treatment line. By returning, both nitrogen and organic matter of the treated water after the solid-liquid separation could be treated well.

  Alternatively, as shown in FIG. 23, the aerobic treatment tank mixed solution in the aerobic treatment tank is electrolyzed to generate hypochlorous acid, and in addition to the above effects, the sludge (negatively charged) charge is reduced. Neutralization facilitated floc formation and improved sedimentation in the solid-liquid separation tank.

(Example 13)
In the configuration shown in FIG. 21, the fishery processing wastewater was treated. The electrolysis treatment was 20 minutes. The results are shown in Table 4.

  When part or all of the influent water is electrolyzed, hypochlorous acid is generated because the inflow water contains electrolytes such as chloride ions. Hypochlorous acid reacts with ammonia nitrogen in the influent water and is oxidatively decomposed to denitrify. Some hypochlorous acid remains and is detected as residual chlorine. The residual chlorine flowed into the aerobic treatment tank, and the activity of activated sludge and yeast could be adjusted.

  As a result, nitrogen removal, CODcr removal, and normal hexane extractable substance removal were also good.

  If the electrolyte is insufficient in the inflowing water, a necessary amount of chemicals that become electrolytes such as sodium chloride is added to the electrolytic cell.

(Example 14)
In order to keep part or all of the influent water anaerobically for an appropriate period of time using the apparatus shown in FIG. 24, it is led to an anaerobic tank, and part or all of the organic matter in the inflow water undergoes anaerobic fermentation, Gave rise to By using this organic acid instead of conventional sulfuric acid or hydrochloric acid, the amount of chemicals could be reduced. Furthermore, the generation of hydrogen sulfide could be reduced even at the site where sludge was anaerobic.

  In this example, the ratio of the amount of inflow water passing through the anaerobic tank and the amount of inflow water not passing through was fixed, but a pH meter was installed in the aerobic treatment tank alone or in the aerobic treatment tank and the anaerobic tank, You may control the ratio of the inflow water amount which passes and the inflow water amount which does not pass.

  However, if the amount of organic acid produced in the anaerobic tank does not reach the required amount, sulfuric acid or hydrochloric acid may be added as appropriate.

(Example 15)
Using the apparatus shown in FIG. 25, the inflow water containing a large amount of organic acid generated in the anaerobic tank was introduced into the sludge return pipe, and after securing the necessary contact time, it was put into the aerobic treatment tank. As in Example 14, the amount of chemicals and malodor were reduced.

(Example 16)
When the apparatus shown in FIG. 26 was used, a part or all of the inflow water to the anaerobic tank and a part or all of the excess sludge were transferred to the anaerobic tank to promote fermentation. In addition to reducing odor and odor, excess sludge could also be reduced.

  The present invention can be used for small-scale sewage treatment facilities, factory wastewater treatment facilities, oil-containing wastewater treatment facilities, high-concentration organic wastewater treatment facilities, and the like.

It is a schematic block diagram which shows one Example of the organic waste water treatment equipment of this invention. It is a schematic block diagram which shows one Example of the organic waste water treatment equipment of this invention. It is a schematic block diagram which shows one Example of the organic waste water treatment equipment of this invention. It is a schematic block diagram which shows one Example of the organic waste water treatment equipment of this invention. It is a schematic block diagram which shows one Example of the organic waste water treatment equipment of this invention. It is the schematic block diagram which shows one Example of the organic waste water treatment equipment of this invention, and showed the structure of the aerobic treatment tank. It is the schematic block diagram which shows one Example of the organic waste water treatment equipment of this invention, and showed the structure of the aerobic treatment tank. It is the schematic block diagram which shows one Example of the organic waste water treatment equipment of this invention, and showed the structure of the aerobic treatment tank. It is the schematic block diagram which shows one Example of the organic waste water treatment equipment of this invention, and showed the structure of the aerobic treatment tank. The schematic block diagram which shows one Example of the organic waste water treatment equipment of this invention was shown. The schematic block diagram which shows one Example of the organic waste water treatment equipment of this invention was shown. The schematic block diagram which shows one Example of the organic waste water treatment equipment of this invention was shown. It is a schematic block diagram (cross section) which shows the Example of a biological treatment unit. It is a schematic block diagram (cross section) which shows the Example of a biological treatment unit. It is a schematic block diagram (cross section) which shows the Example from which the structure of a biological treatment unit differs. It is a schematic block diagram (cross section) which shows the Example from which the structure of a biological treatment unit differs. It is a schematic block diagram (plane) which shows the Example from which the structure of a biological treatment unit differs. It is a schematic block diagram (plane) which shows the Example from which the structure of a biological treatment unit differs. It is a schematic block diagram (plane) which shows the Example from which the structure of a biological treatment unit differs. It is a schematic block diagram which shows the Example at the time of using an electrolytic vessel. It is a schematic block diagram which shows the Example at the time of using an electrolytic vessel. It is a schematic block diagram which shows the Example at the time of using an electrolytic vessel. It is a schematic block diagram which shows the Example at the time of using an electrolytic vessel. It is a schematic block diagram which shows the Example at the time of providing an anaerobic tank. It is a schematic block diagram which shows the Example at the time of providing an anaerobic tank. It is a schematic block diagram which shows the Example at the time of providing an anaerobic tank.

Claims (8)

  An electrolyzer that electrolyzes organic wastewater, an aerobic treatment tank that treats organic wastewater that is aerobic using yeast-containing activated sludge, and a mixture of aerobic treatment tanks and sludge An organic wastewater treatment apparatus comprising: a solid-liquid separation tank that separates into water; and a sludge return pipe that returns the sludge separated in the solid-liquid separation tank to the aerobic treatment tank.   An aerobic treatment tank that treats aerobic and organic wastewater using yeast-containing activated sludge, an electrolytic tank that electrolyzes the aerobic treatment tank mixed liquid, and an aerobic treatment tank mixed liquid that has been treated in the electrolytic tank. And a solid-liquid separation tank that separates into treated water, and a sludge return pipe that returns the sludge separated in the solid-liquid separation tank to the aerobic treatment tank.   The aerobic treatment tank that treats aerobic and organic wastewater using activated sludge containing yeast, the solid-liquid separation tank that separates the aerobic treatment tank mixed liquid into sludge and treated water, and the solid-liquid separation tank The sludge return pipe for returning the sludge to the aerobic treatment tank and the electrolytic tank for electrolyzing the treated water separated in the solid-liquid separation tank are returned to the aerobic treatment tank. An organic wastewater treatment apparatus comprising an electrolytically treated water return pipe.   The organic waste water treatment apparatus according to any one of claims 1 to 3, wherein a chemical injector is provided in the sludge return pipe.   The organic waste water treatment apparatus according to any one of claims 1 to 4, wherein a plurality of partitions are provided in the aerobic treatment tank.   The organic waste water treatment apparatus according to any one of claims 1 to 5, further comprising a levitated substance separation tank for separating levitated sludge.   The organic waste water treatment apparatus according to any one of claims 1 to 6, wherein a simple sedimentation tank is provided in the aerobic treatment tank.   The organic waste water treatment apparatus according to any one of claims 1 to 7, wherein an anaerobic tank for generating an organic acid is provided.

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