KR20060023537A - Method of treating organic waste water and organic sludge and treatment equipment therefor - Google Patents

Abstract

A treatment equipment for organic waste water and organic sludge, comprising foam separation tank (5) in which waste water after removal of solid matter such as fish meat piece is introduced; bubble generating means (16) disposed in the foam separation tank (5) and capable of generating fine bubbles in the waste water; membrane separation active sludge treating tank (10) in which the foam generated in the foam separation tank (5) is introduced; and culture water bath (35) in which excess organic sludge having occurred in the membrane separation active sludge treating tank (10) is introduced and in which benthic organism (32) is raised. Organic waste water having occurred in fishing ports, fish markets, land cultivation farms, etc. is subjected to active sludge treatment in the membrane separation active sludge treating tank (10). Thus generated excess organic sludge is introduced in the culture water bath (35), so that the excess organic sludge is digested, reduced in weight and disposed of as feeding stuff (feed) of benthic organism. As a result, purification treatment of organic waste water occurring in large volume in fishing ports, fish markets, land cultivation farms, etc. and treatment of excess organic sludge after the purification treatment can be carried out in economic advantage.

Description

METHOD OF TREATING ORGANIC WASTE WATER AND ORGANIC SLUDGE AND TREATMENT EQUIPMENT THEREFOR}

TECHNICAL FIELD The present invention relates to a technology for preventing marine pollution, and more particularly, to protect fish from fish tanks, fish markets, and aquaculture farms, to clean fish, to thaw frozen fish, and to remove blood and meat pieces generated during fish dismantling. The present invention relates to a method and apparatus for treating organic wastewater and organic wastewater in terrestrial aquaculture, a method and apparatus for treating excess organic sludge generated after treatment of the organic wastewater.

Conventionally, in a fish tank or a fish market, for example, the freshness of fish, the thawing of frozen fish, the decomposing fish, blood, meat pieces, etc. are produced by filtration sterilized seawater rather than tap water for reasons such as maintaining freshness of the fish. Washing is performed. As a result, the amount of organic wastewater generated increases and decreases according to the catch amount, and the concentration of turbidity increases and decreases according to the work content such as the sorting method of fish to be delivered and the operation of bleeding from fresh fish. As described above, biological treatment of organic wastewater with varying water quantity and contaminant concentrations is difficult to purify due to the fact that the contaminant load is not constant, and most of them are re-discharged to the ocean in an untreated state.

A technique for solving this problem directly cannot be found, but as a related technique, a water purification method for filtering wastewater in a fish tank by sand filtration has been proposed (see Patent Document 1).

However, since the removal of fouling components by the apparatus described in Patent Document 1 mainly consists of filtration treatment using sand filter media or the like, clogging of the filter media frequently occurs when it is applied to organic wastewater treatment generated in a fish tank or a fish market. It may occur. Originally, aquaculture tanks have low soil concentrations and are almost constant, and the pollutants generated are caused only by solids such as fish secretions and remaining foods, and since the water is used in circulation, there is little variation in the amount of wastewater. Even if it is applied to the wastewater treatment which generate | occur | produces largely from etc., it does not supply very practically. In addition, although the prior art of digesting and reducing surplus organic sludge generated after biological treatment using a low-life organism is not particularly found, a method of decomposing organic sludge, such as remaining food deposited on the bottom of aquaculture, is incubated in advance in large quantities. There has been proposed a method of digesting and reducing sludge by spreading a litterworm (see Patent Document 2).

Patent Document 1: Japanese Patent Application Laid-Open No. 5-96291 (Second to 3rd page, Fig. 1)

Patent Document 2: Japanese Patent Application Laid-Open No. 2001-231394 (Pages 2 to 5)

SUMMARY OF THE INVENTION In view of the problems of the prior art as described above, the present invention provides a method for treating organic wastewater and a method for treating organic wastewater, which can be economically carried out after the purification and purification of organic wastewater generated in large quantities in a fish tank, a fish market, and an aquaculture farm. It is an object to provide a device.

That is, the present invention is a method for treating organic wastewater generated from a fishbowl, a fish market, or the like, and aeration treatment of wastewater from which solid matter such as fish meat pieces is removed, and the foam generated by the aeration treatment is activated sludge treatment. The first feature is to filter the membrane.

Further, an apparatus for treating organic wastewater generated from a fishbowl, a fish market, or the like according to the present invention is provided with a foam separation tank into which wastewater from which solid matters such as fish meat pieces are removed is introduced, and installed in the foam separation tank to generate fine bubbles in the wastewater. A second feature is that the bubble generating means is constituted by a membrane separation activated sludge treatment tank into which the foam generated by the bubble generating means is introduced, and the bubble generating means is a self-absorbing fine bubble generating device.

In addition, the present invention, the organic wastewater generated from the fish tank, fish market, and land farms, and the biological treatment, and the surplus organic sludge generated after the biological treatment is introduced into the culture tank where the low-life organisms are raised to the excess organic sludge The fourth feature is that the digestion loss treatment is made of feed of the organism, and the fifth treatment is the active sludge method.

In addition, it is an apparatus for treating organic wastewater and organic sludge generated from a fish tank, a fish market, and an aquaculture farm, and a foam separation tank into which wastewater from which solid matter such as fish meat is removed has been introduced, and microbubbles in the wastewater installed in the foam separation tank. Bubble generation means for generating a, a membrane separation activated sludge treatment tank into which foam generated in the foam separation tank is introduced, and a surplus organic sludge generated from the membrane separation activated sludge treatment tank is introduced, and a culture tank in which low-life organisms are raised. A sixth feature is to provide, and a seventh feature is to fill the culture tank with a filter medium such as sand to obtain filtered water. In addition, the eighth feature is that the endogenous organisms are sediment-eating organisms and / or suspension-eating organisms.

EMBODIMENT OF THE INVENTION Hereinafter, although embodiment of this invention is described based on FIGS. 1-10, it cannot be overemphasized that this invention is not limited to this embodiment.

1 is a configuration diagram schematically showing an apparatus for treating organic wastewater according to the present invention.

2 is a longitudinal sectional view of the foam separation tank.

3 is a cross-sectional view of an essential part of a self-absorbing fine bubble generator.

4 is a longitudinal sectional view of the membrane separation activated sludge treatment tank.

5 is a configuration diagram schematically showing a test apparatus according to the present invention.

6 is a configuration diagram schematically showing an apparatus for treating organic wastewater and organic sludge according to the present invention.

7 is a configuration diagram schematically showing another embodiment of the water level adjusting method in the culture tank.

8 is a configuration diagram schematically showing a test apparatus according to the present invention.

Fig. 9 is an internal photograph of aquaculture tanks showing a state of introduction of sludge.

10 is an internal photograph of the culture tank showing the digestion loss state of the sludge by the worms.

EMBODIMENT OF THE INVENTION Hereinafter, the best form for implementing this invention is described in detail, referring drawings.

(First embodiment)

In the figure, reference numeral 1 denotes organic wastewater generated from a fishbowl, a fish market, or the like, and pretreatment such as removal of solids such as fish meat pieces is performed in advance by solid-liquid separation means such as a sedimentation tank 2 or a screen 3. The pretreated wastewater 4 is introduced into the foam separation tank 5 and aerated for a predetermined time by the self-suction microbubble generating device 16 in the foam separation tank 5 to be subjected to foam separation treatment. The self-sufficient microbubble generating device 16 can change the size of the bubble. Incidentally, the size of bubbles generated here is 1 mm or less. In addition, although the example of a self-suction microbubble generation apparatus is shown in this Example, if it is an acid diffuser and a microbubble generate | occur | produces, it will not specifically limit. The foam 7 floating on the water surface of the foam separation tank 5 is rolled out by a known rolling machine or the like and discharged from the foam outlet 6. Here, in the foam separation tank 5, it is necessary to hold the waste water 4 in the tank for a certain time. Therefore, when the waste water 4 exceeding the capacity of only one portion of the foam separation tank 5 has to be treated, The wastewater 4 may be weighed in advance in a distribution metering tank (not shown) and distributed to and treated by a plurality of foam separation tanks 5. Since the fouling load of the aerated treated water 8 aerated in the foam separation tank 5 is sufficiently reduced, it can usually be discharged as it is, but it can also be oxidized by contact with ozone gas or mixed with a coagulant to form a coagulation sedimentation tank. It is better to induce sedimentation treatment by induction, or to introduce into a contact aeration tank to carry out microbial treatment to reduce fouling load and discharge.

On the other hand, the nature and condition of the foam 7 separated from the waste water 4 is higher than that of the waste water 4, but the concentration of the pollutant load is higher than that of the waste water 4, but the concentration of the foam 7 is almost constant and is very small compared to the amount before the aeration treatment. It becomes a state suitable for a process. The foam 7 discharged from the foam outlet 6 by the chucking machine is introduced into the membrane separation activated sludge treatment tank 10 by the transfer pump 9 and is treated with activated sludge, while the treated sludge treated water is The sludge is sucked by the suction pump 13 via the separation membrane 12, and the activated sludge is membrane-separated and discharged as clean membrane separation seawater. As the type of membrane used for the separation membrane 12, a microfiltration membrane, an ultrafiltration membrane, or the like can be used. As the membrane shape, a sheet-like flat membrane, a tubular hollow fiber, or the like can be used, but is not particularly limited.

Next, the operation of the apparatus of the present invention will be described for each component.

2 is a longitudinal sectional view of the foam separation tank 5. The pretreated wastewater 4 is introduced from below the water tank body 15 of the foam separation tank 5. In addition, although the aeration treatment of the introduced wastewater 4 is performed, in the present invention, the impeller 18 of the self-suction microbubble generating device 16 is driven to rotate by the motor 17, and the impeller 18 is rotated. At the same time, the upper end is open to the air at a position higher than the surface of the water tank outside the water tank main body 15, and the air from the air introduction pipe 19 inserted into the center of the impeller 18 installed in the water tank main body 15 is air. Is inhaled and incorporated into the wastewater. In addition, the mixed air generates fine bubbles by vortex and shear force generated by the rotation of the impeller 18. The generated fine bubbles float and move toward the foam outlet 6 while attaching organic matter or fine suspended matter in the waste water 4 to the bubble surface to form a foam (scum) layer 7 on the water surface near the outlet 6. . The foam layer 7 is discharged out of the water tank body 15 by a conventionally known rolling machine. On the other hand, the treated water separated by the foam after the aeration is treated by passing downwardly through the airflow port 21 opened below the barrier plate 20 which partitions the foam separation tank 5 inside by vertically descending from the discharge port 6. It is discharged from the water outlet 22.

3 is a longitudinal sectional view of an essential part of the self-absorbing microbubble generating device 16. When the impeller 18, which is a hollow stirring body, is rotated by the driving of the motor 17, a negative pressure is generated in the vicinity of the air inlet tube 19 inserted into and communicated with the hollow part of the impeller 18. 19) has a structure in which air is drawn by itself from the upper end of the air opening. This negative pressure is produced by agitation so that the water in the vicinity of the impeller 18 moves in the direction away from the impeller 18. In addition, the self-supporting microbubble generating device 16 is not limited to this embodiment, You may use the self-supporting microbubble generating device of another structure. In addition, the code | symbol 23 is a rectifying plate in a figure, and is provided in the bottom part in the tank main body 15 in order to prevent the water in the foam separation tank 5 by the impeller 18 from idling.

4 is a longitudinal sectional view of the membrane separation activated sludge treatment tank 10. The membrane separation active sludge treatment tank 10 is partitioned by a partition wall 26 by a denitrification tank 24 for removing nitrogen in the wastewater and a nitriding tank 27 for initial treatment of ammonia using a microorganism or the like. Although there is no problem in particular in the property and state of the treated water 11 by active sludge treatment, you may comprise only the tank 27. As shown in FIG. The foam (scum) 7 separated from the foam separation tank 5 is transferred by the transfer pump 9 and introduced into the denitrification tank 24. In addition to the foam 7, the circulating liquid from the denitrification tank 24 is transferred to the denitrification tank 24 by the circulation pipe 28 and the circulation pump 29. The stirrer 25 is provided in the bottom part of the denitrification tank 24, and the foam (scum) 7 performs stirring mixing with a circulating fluid. Then, when the mixed liquid of the allowable amount or more is stored in the denitrification tank 24, the liquid flows into the tank 27 over the partition wall 26. The tank 27 includes an air dispersing device 31 for maintaining the inside of the tank in an aerobic state, a blower 30 for transferring air to the tank, a separator 12 provided above the air dispersing device 31, and A suction pump 13 for sucking the membrane separation water through the separation membrane 12 is provided. The mixed liquid introduced into the tank 27 is separated into the membrane separation treated water 11 and the activated sludge by the separation membrane 12 and the suction pump 13 while the agitator is stirred, and the treated water 11 is treated with the membrane separated active sludge treatment. Discharged out of the system of the bath 10. Moreover, the suction pump 13 is started when the water level in the tank 27 becomes HWL (upper limit water level), and stops when the water level becomes LWL (lower limit water level).

By using the wastewater treatment method and treatment apparatus of the present invention, it is possible to include a fish tank, a fish market or the like that has not been treated previously, including washing fish, washing fish, thawing frozen fish, blood and meat pieces generated during dismantling of fish. The fouling component can be separated from a large amount of organic wastewater in a short time. In addition, by performing microbial treatment or the like on the treated wastewater, the fouling load of the seawater re-discharged to the sea can be reduced.

[Test Example]

Next, the result of having conducted the wastewater treatment test based on the present invention is shown below. Using the test apparatus shown in Fig. 5, the drier, baggage treatment, and wastewater taken out from the fish tank under the following test conditions were treated with wastewater in a foam separation tank and a membrane separation activated sludge treatment tank. The results are shown in Table 1.

Exam conditions ;

Foam separator: self-contained foam separator (effective volume 25 L, residence time 30 minutes)

Membrane Separation Activated Sludge Treatment Tank: Only a supernatant tank is installed (effective capacity 5L, residence time about 12 hours)

Foam separator treatment volume: 50 L / hr

Foam generation amount: about 420 ml / hour

Membrane filtration quantity: about 420 ml / hour (intermittent operation by water tank level)

Membrane module: membrane area 0.1 ㎡, flex 0.1 ㎥ / ㎡ · day

TABLE 1

Item COD (mg / L) Turbidity (-) protein(-) Foam separation water 18.2 0.031 0.239 Foam (separation water) 820 ― ― Membrane Separation Activated Sludge Treatment Water 19.8 ― ―

In the table, COD is oxygen consumption by JIS K0102 19 alkaline potassium permanganate, turbidity is JIS K0101 9.2 transmitted light turbidity (wavelength 660 nm), and protein was measured by absorption spectrum (wavelength 280 nm) by spectrophotometer. .

Next, the fouling concentration of the untreated wastewater in the fish tank was measured. The results are shown in Table 2.

TABLE 2

Item COD (mg / L) Turbidity (-) protein(-) Wastewater Drained to the Ocean 36.7 0.085 0.461

As apparent from the results of Table 1 and Table 2, it was confirmed that the waste load of the wastewater was reduced by about 50% by the wastewater treatment of the present invention, and the removed fouling component was treated with about 97.5% active sludge.

(2nd Example)

In Fig. 6, reference numeral 1 denotes organic wastewater mainly composed of seawater generated from a fishbowl, a fish market, an aquaculture farm, etc., and solids such as fish meat pieces by solid-liquid separation means such as a sedimentation tank 2 or a screen 3 in advance. Pretreatment, such as removal, is performed. The pretreated wastewater 4 is introduced into the foam separation tank 5 and aerated for a predetermined time by the self-suction microbubble generating device 16 in the foam separation tank 5 to be subjected to foam separation treatment. Since the self-absorption microbubble generating device 16 can vary the intake air amount, it is possible to change the size of the bubbles. Incidentally, the size of bubbles generated here is 1 mm or less. In addition, although the example of a self-suction microbubble generation apparatus is shown in this Example, if it is an acidic device and a microbubble is generated, it will not specifically limit. The foam 7 floating on the water surface of the foam separation tank 5 is rolled out by a known rolling machine or the like and discharged from the foam discharge port 6. Here, in the foam separation tank 5, it is necessary to keep the waste water 4 in the tank for a predetermined time, so that when the waste water 4 exceeding the capacity of only one of the foam separation tank 5 has to be treated, The wastewater 4 may be previously weighed with a distribution metering tank (not shown), distributed to a plurality of foam separation tanks 5, and treated. Since the fouling load of the aerated treated water 8 aerated in the foam separation tank 5 is sufficiently reduced, it can usually be discharged as it is, but it can also be oxidized by contact with ozone gas or mixed with a coagulant to form a coagulation precipitation tank. It is better to conduct the sedimentation treatment by induction in a furnace, or to introduce it into a contact aeration tank or the like, and to carry out microbial treatment to reduce the amount of fouling and to discharge it.

On the other hand, the nature and state of the foam 7 separated from the waste water 4 have a higher pollutant load concentration than the waste water 4, but the soil concentration is almost constant and is very small compared to the amount before the aeration treatment. It becomes a state suitable for active sludge processing. The foam 7 discharged from the foam outlet 6 by the chucking machine is introduced into the membrane separation activated sludge treatment tank 10 by the transfer pump 9 and is treated with activated sludge, while the treated sludge treated water is The sludge is sucked by the suction pump 13 via the separation membrane 12, and the activated sludge is membrane-separated and discharged as clean membrane separation treated water 11. As the kind of membrane used for the separation membrane 12, a microfiltration membrane, an ultrafiltration membrane, etc. can be used, A sheet-like flat membrane, a tubular hollow fiber membrane, etc. can be used, but it is not specifically limited.

The surplus sludge 14 of the membrane-separated active sludge treatment tank 10 is introduced into the culture tank 35 in which the worms 32, which are endogenous organisms, are cultured by suction and discharge means such as a pump. The culture tank 35 is filled with sand 39, which is a filter medium, and has a communication hole through which the sand does not fall off at the bottom and water permeation is provided at the bottom, or a nonwoven fabric is provided at the bottom of the sand ( 38, an air dispersing device 36 for supplying air into the aquaculture tank using air transferred from the blower 37, and a circulation pump 34 for refluxing the filtrate in the aquaculture tank 35 to a suitable container 38. It consists of). Although the communication hole and / or nonwoven fabric is provided in the bottom part of the container 38 here, it can also be provided in the side surface, and is not specifically limited. The container 38 may be configured so as to discharge seawater that is discharged after the excess sludge is filtered and digested and reduced, and is not particularly limited.

Next, the operation of the apparatus of the present invention will be described for each component.

The pretreated wastewater 4 is supplied from the lower part of the foam separation tank 5 and aerated by the self-suction microbubble generating device 16 in the separation tank. Bubbles generated by the microbubble generating device float floating toward the foam outlet 6 while attaching organic matter or fine suspended matter in the waste water 4 in the foam separation tank 5 to the bubble surface, and on the water surface near the outlet 6. A foam layer 7 is formed in the film. The foam layer 7 is discharged out of the foam separation tank 5 by a conventionally known rolling machine. On the other hand, the foamed treated water 8 after the aeration is vertically descended from the discharge port 6 and passed through the bottom of the plate partitioning the foam separation tank 5 inside, and drained out of the foam separation tank 5.

The foam 7 generated in the foam separation tank 5 is transferred to the membrane separation activated sludge treatment tank 10 by the transfer pump 9. In the treatment tank 10, the organic matter in the separated foam 7 is biodegraded by the activated sludge, and the solid solution is separated into the activated sludge and the treated water 11 by the separation membrane 12 and the suction pump 13. In the treatment tank 10, an air diffuser 17 is provided to supply air supplied from the blower 16 into the tank. The oxygen supply to the activated sludge and the air cleaning of the separation membrane 12 are simultaneously performed.

On the other hand, the foam 7 is treated with active sludge, and the surplus sludge 14 that has been increased is introduced into the upper portion of the sand filled in the vessel 38 by a conventionally known pump or the like. The introduced sludge 14 has a structure in which solid matter is filtered by the filter medium 39, and the filtered water flows out from the lower part of the container 38 to the culture water tank 35. In the filter medium 39 inside the container 38, worms 32 are bred, and when the surplus sludge 14 is introduced and the solids are replenished by the filter medium 39, the solids are fed (feeding) of the worms 32. As digestion is reduced. On the other hand, the seawater filtered by sand moves to the aquaculture tank 35, and the air is supplied by the air dispersing device 36 to increase the dissolved oxygen level, and is transferred to the vessel 38 by the circulation pump 34. In addition, in this embodiment, although a worm is used for a low life organism, another sedimentary food-induced organism may be sufficient, the suspension vegetation intrinsic life organism represented by bivalve shell may be sufficient, and you may mix and use a quantum endogenous organism.

Here, the water level of the culture tank 35 is increased by the transfer of the surplus sludge 14 introduced, but the water level is detected using a conventionally known water level detector (not shown), and when the water level reaches a certain level, the water level adjustment of the lower part of the tank is performed. By opening the valve 33, the water level can be dropped to a normal level. As other level adjustment means, the overflow pipe 40 as shown in FIG. 7 may be used, and may be divided and used according to the height of an outflow source.

By using the processing method and the processing apparatus of the present invention, the fishing vessels, fish market and land farms, which have not been treated previously, the cleaning of fish, the thawing of frozen fish, the blood and meat pieces generated at the time of dismantling the fish, etc. By separating only the pollutant component from the organic wastewater containing seawater as a main component in a short time, and subsequently treating the separated wastewater with microorganisms, it is possible to reduce the fouling load flowing into the ocean, and also to remove the surplus sludge generated from the microbial treatment. The final surplus sludge treatment costs can be reduced by digesting and reducing the feed (feed) of suspended food-borne parasites represented by sediment-eating parasites and / or bivalve shells such as worms. In the present embodiment, organic wastewater containing seawater as a main component has been described. However, as long as it is wastewater resulting from the treatment of fish, treatment targets such as seawater and fresh water are not particularly limited.

In the case of treating wastewater in onshore farms, organic solids do not contain impurities such as large solids or sand. Therefore, the wastewater from the aquaculture tank can be directly injected into the foam separation tank 5 and treated by the method described so far. .

Next, a treatment test of organic wastewater and organic sludge was performed based on the method of the present invention using the test apparatus shown in FIG.

A foam separation tank is installed in an actual fish market wastewater treatment facility (F) consisting of a pretreatment tank (A), a flow control tank (B), a contact aeration tank (C), and a settling tank (D), and the incoming wastewater is discharged to the wastewater treatment facility. A portion of the foam generated by the aeration treatment is stored in the foam storage tank 41 once from the flow rate adjusting tank B of (P) by a pump, and then stored in the foam storage tank 41, and then a small membrane separation activated sludge treatment is performed. After the sludge was added to the tank 10 to carry out the active sludge treatment, 40 ml of the activated sludge was fed into the culture tank 35 in which the wormworm 32 was bred once a day. The water quality was measured with respect to the wastewater conveyed from the flow regulating tank B, the aeration process water, the generated foam, and the treated water of membrane separation activated sludge. The results are shown in Table 3.

Test apparatus and test conditions;

Foam separator: Self-contained foam separator, effective capacity 600 L, residence time 120 minutes

Membrane Separation Activated Sludge Treatment Tank: Denitrification Tank, Supernatant Tank, Effective Capacity 15 L

Residence time: about 5 days

Foam separator treatment volume: 300 L / hr

Foam generation amount: about 15L / hour

Membrane filtration quantity: Approx. 125 L / hr (intermittent operation by water tank level)

Membrane module: membrane area 0.1 ㎡, Flex 0.03 ㎥ / ㎡ · day

Aquaculture tank: 5 L Prasco (effective capacity 3 L), container 0.5 L, weight of worms 20 g

Excess amount of sludge added to aquaculture tank: about 3 g / day (dry) (wet condition: 40 ml / day)

Reflux Quantity: 30 ml / min

TABLE 3

Item COD (mg / L) Turbidity (-) Protein (mg / L) Wastewater from fish tank fish market 52.9 87 349.6 Foam separation water 11.4 21 53.5 Foam (separation water) 290 468 ― Treatment water of membrane separation activated sludge 10.5 ― ―

In the table, COD is the oxygen consumption by JIS K0102 19 alkaline potassium permanganate, turbidity is the FTU turbidimeter of DR2000 manufactured by HACH, and protein is measured from the calibration curve by measuring the absorption spectrum (wavelength 750 mm) in the Lowry-Folin method. The concentration in water was calculated.

As apparent from Table 1, it was confirmed by the treatment method of the present invention that the contamination load of the wastewater was reduced by about 78%, and the removed contamination component was treated by about 96% activated sludge.

The degree of digestion of sludge caused by worms was observed visually by the predation state of sludge supplemented by filtration. The elapsed state is shown in FIG. 9 and FIG. FIG. 9 is an internal photograph of the culture tank 1 hour after the activated sludge is added, and FIG. 10 is an internal photograph of the culture tank about 1 day after the activated sludge is added. As can be seen from these photographs, the sludge injected about 1 day after the active sludge was fed almost entirely by a worm. In addition, the worms farmed in this way can also be used as fishing food.

As described above, the wastewater treatment method and apparatus of the present invention can make it possible to purify organic wastewater generated in large quantities in a fishbowl, fish market, and the like, and as a result, it can greatly contribute to the prevention of marine pollution.

By the treatment method and apparatus of the present invention, the fouling load of the re-discharge wastewater can be reduced by about 80%. In addition, by preserving sludge and extinguishing sludge from endogenous organisms such as worms, the incineration of the final residue is unnecessary, which can reduce the maintenance cost of the treatment facility and become part of resource saving measures such as fossil fuel. Can be. In addition, since the worms farmed by the method of the present invention can be used as a fishing feed can greatly contribute to resource saving and resource regeneration.

Claims (8)

A method for treating organic wastewater generated from a fishbowl, a fish market, or the like, wherein the wastewater from which solid matters such as fish meat pieces have been removed is subjected to aeration, and the foam generated by the aeration treatment is activated sludge treated and membrane filtered. A method of treating organic wastewater generated from a fish market or the like. An apparatus for treating organic wastewater generated from a fishbowl, a fish market, etc., the foam separation tank into which wastewater from which solid matters such as fish meat pieces have been removed is introduced, and bubble generation means installed in the foam separation tank to generate fine bubbles in the wastewater; An apparatus for treating organic wastewater generated from a fish tank, a fish market, or the like, comprising a membrane separation activated sludge treatment tank into which generated foam is introduced. The organic wastewater treatment apparatus according to claim 2, wherein the bubble generating means is a self-adsorbing fine bubble generating apparatus. Organic wastewater from fish tanks, fish markets, and land farms is stored and biotreated, and surplus organic sludge generated after biotreatment is introduced into aquaculture tanks for breeding of undergrowth organisms, and the surplus organic sludge is used as feed for the undergrowth organisms. Process for treating organic sludge, characterized in that the digestion loss treatment. The method for treating organic sludge according to claim 4, wherein the biological treatment is performed by an active sludge method. A device for treating organic wastewater and organic sludge generated from a fishing port, a fish market and an aquaculture farm, and wastewater obtained by removing solids such as fish meat pieces is introduced and is formed in a foam separation tank and the foam separation tank to generate fine bubbles in the wastewater. And a culture tank in which a foam separation means to be introduced, a membrane separation activated sludge treatment tank into which foam generated in the foam separation tank is introduced, and excess organic sludge generated from the membrane separation active sludge treatment tank are introduced, and low life organisms are raised. An apparatus for treating organic wastewater and organic sludge, characterized by the above-mentioned. The method for treating organic sludge and the apparatus for treating organic wastewater and organic sludge according to any one of claims 4 to 6, wherein the culture water tank is filled with a filter medium such as sand to obtain filtered water. 8. The method for treating organic sludge and the apparatus for treating organic wastewater and organic sludge according to any one of claims 4 to 7, wherein the endogenous organism is a sediment-eating hypoplasia and / or a suspension-eating hypoplasia.

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