WO2004106240A1

WO2004106240A1 - Method of treating organic waste water and organic sludge and treatment equipment therefor

Info

Publication number: WO2004106240A1
Application number: PCT/JP2004/008235
Authority: WO
Inventors: Yoshitada Hamasaki
Original assignee: Asahi Organic Chemicals Industry Co., Ltd.
Priority date: 2003-05-27
Filing date: 2004-05-27
Publication date: 2004-12-09
Also published as: KR20060023537A; KR101102179B1

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

Specification

Method and apparatus for treating organic wastewater and organic sludge

Technical field

The present invention relates to a technology for preventing marine pollution, and more particularly, to an organic wastewater containing blood and meat fragments generated at the time of landing of fish, washing of fish, thawing of frozen fish, and demolition of fish in a fishing port, a fish market, a land farm, and the like. The present invention also relates to a method and an apparatus for treating organic wastewater in onshore aquaculture, a method for treating excess organic sludge generated after the treatment of the organic wastewater, and an apparatus therefor.

Background art

[0002] Conventionally, in fishing ports and fish markets, blood generated during washing of landed fish, thawing of frozen fish, and demolition of fish using seawater that has been filtered and sterilized instead of tap water for reasons such as maintaining freshness of fish. And cleaning of meat pieces. The amount of organic wastewater generated by this will increase or decrease according to the amount of fish caught, and the pollutant concentration will increase or decrease according to the method of selecting the fish to be landed or the work to be performed, such as live fish bleeding. Biological treatment of organic wastewater with varying water volume and pollutant concentration is difficult because of the variable pollution load, and it is difficult to purify the wastewater. Most of the wastewater is re-discharged to the ocean without treatment! / Puru is the current situation.

[0003] There is no particular technique for directly solving this problem, but as a related technique, a water purification method for filtering wastewater from a fish tank using sand filtration has been proposed (see Patent Document 1).

[0004] However, as described in Patent Document 1, the removal of contaminated components by the Puru device is mainly performed by filtration using a sand filter material, etc., which occurs at fishing ports and fish markets. When applied to organic wastewater treatment, filter media may frequently be clogged. In the first place, the aquaculture tanks have a low concentration of pollutants and are almost constant, and the pollutants generated are only due to solids such as fish droppings and bait, and the water is used in circulation, so there is almost no change in the amount of wastewater. However, even if it is applied to the treatment of wastewater generated in large quantities at fishing ports and fish markets, it is not very practical. In addition, there is no particular technology that digests and reduces excess organic sludge generated after biological treatment using benthic organisms. As a method for dispersing organic sludge such as residual food deposited on the bottom of a bed, a method has been proposed in which a large amount of cultivated silkworm is sprayed in advance to digest and reduce the sludge (see Patent Document 2).

Patent Document 1: JP-A-5-96291 (pages 2-3, FIG. 1)

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

Disclosure of the invention

[0006] In view of the above-mentioned problems of the prior art, the present invention economically reduces the amount of organic wastewater generated in large quantities at fishing ports, fish markets, land farms, and the like, and the processing of excess organic sludge after the purification. It is an object of the present invention to provide a method of treating organic wastewater and a treatment apparatus therefor, which can be carried out in a short time.

[0007] That is, the present invention relates to a method for treating organic wastewater generated from a fishing port, a fish market, or the like, wherein the wastewater from which solid matter such as fish meat pieces has been removed is subjected to aeration treatment, and foam generated by the aeration treatment is removed. The first feature is that activated sludge treatment and membrane filtration are performed.

[0008] Further, the apparatus for treating organic wastewater generated from a fishing port, a fish market, or the like according to the present invention includes a foam separation tank into which wastewater from which solid substances such as fish meat pieces have been removed is introduced, and a foam separation tank inside the foam separation tank. a bubble generating means for generating fine bubbles in the waste water is installed, and a ^second feature in that foam that occurred is configured from the membrane and the separation activated sludge treatment tank is introduced by the gas bubble generating means, further A third feature is that the bubble generation means is a self-priming fine bubble generation device.

[0009] Further, the present invention receives organic wastewater generated from a fishing port, a fish market, a land farm, or the like, performs biological treatment, and surpluses organic sludge generated after the biological treatment to produce benthic organisms. The fourth feature is that the biological treatment is carried out by an activated sludge method by introducing the excess organic sludge into feed for the benthic organisms to reduce the amount of the organic sludge. Is the fifth feature.

[0010] Further, the present invention is an apparatus for treating organic wastewater and organic sludge generated from a fishing port, a fish market, an onshore farm, and the like, wherein the wastewater from which solid matter such as fish meat pieces has been removed is introduced. A bubble generation means installed in the foam separation tank to generate fine bubbles in wastewater; a membrane separation activated sludge treatment tank into which foam generated in the foam separation tank is introduced; and the membrane separation activated sludge. Processing tank power The sixth characteristic is that the tank is provided with a culture tank in which surplus organic sludge generated is introduced and benthic organisms are bred, and the culture tank is filled with a filtering material such as sand. The seventh feature is to fill and obtain filtered water. Further, the eighth feature is that the benthic organism is a sedimentary benthic benthic and a Z or suspended sedimentary benthic organism.

BRIEF DESCRIPTION OF THE FIGURES

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 10, but the present invention is not limited to this embodiment! / Needless to say! / ,.

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

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

FIG. 3 is a sectional view of a main part of a self-priming microbubble generator.

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

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

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

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

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

FIG. 9 is an internal photograph of the aquaculture tank showing the state of sludge introduction.

FIG. 10 is an internal photograph of an aquaculture tank showing sludge digestion and weight loss by kaikai.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

Example 1

[0013] In the figure, reference numeral 1 denotes organic wastewater generated from a fishing port, a fish market, or the like, which has been subjected to pretreatment such as removal of solids such as fish meat pieces by a solid-liquid separation means such as a settling tank 2 and a screen 3 in advance. Will be applied. The pre-treated wastewater 4 is introduced into a foam separation tank 5 and aerated for a certain period of time by a self-priming microbubble generator 16 in the foam separation tank 5 to be subjected to a foam separation treatment. The self-priming microbubble generator 16 can change the size of bubbles. The size of the bubbles generated here is less than lmm. In this embodiment, an example of a self-priming microbubble generator is shown. However, the present invention is not particularly limited as long as it can generate microbubbles that can be diffused by a diffuser. The foam 7 floating on the water surface of the foam separation tank 5 is removed by a known wiper or the like. Are discharged. Here, in the foam separation tank 5, since the wastewater 4 needs to be retained in the tank for a certain period of time, if the wastewater 4 that exceeds the capacity of one foam separation tank 5 must be treated, Wastewater 4 may be pre-measured in a distribution weighing tank (not shown) and distributed to multiple foam separation units 5 for treatment! / ヽ. Since the aeration treatment water 8 aerated in the foam separation tank 5 has a sufficient pollution load, it can be discharged normally as it is.Furthermore, it can be oxidized by contact with ozone gas, or coagulated by mixing a flocculant. It is more preferable to conduct the sedimentation separation treatment by introducing into the sedimentation tank, or to introduce into the contact aeration tank and perform microbial treatment to further reduce the pollution load and discharge.

[0014] On the other hand, the properties of the foam 7 separated from the wastewater 4 are such that the pollution load concentration is higher than that of the wastewater 4, but the pollution concentration is almost constant and is extremely small compared to the amount of water before the aeration treatment. Therefore, it is in a state suitable for activated sludge treatment. The foam 7 discharged from the foam discharge port 6 by the contacting machine is introduced into the membrane separation activated sludge treatment tank 10 by the transfer pump 9 and is subjected to the activated sludge treatment. The activated sludge is sucked by the suction pump 13 through the membrane 12, and the activated sludge is membrane-separated and discharged as clear membrane-separated seawater. Microfiltration membranes and ultrafiltration membranes can be used as the type of membrane used for the separator 12, and the shape of the membrane can be a sheet-shaped flat membrane or a tubular hollow fiber, but is particularly limited. It is not done.

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

FIG. 2 is a longitudinal sectional view of the foam separation tank 5. The pretreated wastewater 4 is introduced from below the tank body 15 of the foam separation tank 5. Then, aeration treatment of the introduced wastewater 4 is performed. In the apparatus of the present invention, the impeller 18 of the self-priming microbubble generator 16 is rotationally driven by the motor 17, and at the same time as the impeller 18 rotates, the upper end is rotated. Air is released to the atmosphere outside the water tank body 15 at a position higher than the water surface of the water tank, and the lower end is sucked in from the air introduction pipe 19 inserted inside the center of the impeller 18 installed in the water tank body 15, and wastewater is discharged. Mixed in. The mixed air generates fine bubbles due to the vortex generated by the rotation of the impeller 18 and the shearing force. The generated microbubbles move upward to move toward the foam outlet 6, which does not allow organic substances and fine suspended matter in the wastewater 4 to adhere to the bubble surface, and foams on the water surface near the outlet 6 (scum). ) Layer 7 is formed. The foam layer 7 is separated from the water tank body 1 by a conventionally known removing machine. 5 Discharged outside. On the other hand, the treated water separated from the foam after aeration is discharged from the treated water discharge port 22 through the advection port 21 opened below the weir plate 20 that divides the inside of the foam separation tank 5 from the discharge port 6. Is done.

FIG. 3 is a longitudinal sectional view of a main part of the self-priming microbubble generator 16. When the motor 17 drives the impeller 18, which is a hollow agitator, rotates, a negative pressure is generated in the vicinity of the air introduction pipe 19, which is inserted into the hollow part of the impeller 18, and the air in the air introduction pipe 19 is released. The air is naturally sucked from the open upper end. This negative pressure acts by stirring so that water near the impeller 18 is moved away from the impeller 18. The self-priming microbubble generator 16 is not limited to the present embodiment, and a self-priming microbubble generator having another structure may be used. In the figure, reference numeral 23 denotes a flow straightening plate, which is provided at the bottom of the water tank main body 15 to prevent the water in the foam separation tank 5 from rotating together with the impeller 18.

FIG. 4 is a longitudinal sectional view of the membrane separation activated sludge treatment tank 10. The membrane separation activated sludge treatment tank 10 is divided by a partition wall 26 into a denitrification tank 24 for removing nitrogen from wastewater and a nitrification tank 27 for nitrifying ammonia using microorganisms or the like. However, if there is no particular problem in the properties of the treatment water 11 by the activated sludge treatment, the treatment water 11 may be constituted only by the nitrification tank 27. The foam (scum) 7 separated in 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, a circulating fluid from a nitrification tank 27 is transferred and introduced into a denitrification tank 24 by a circulation pipe 28 and a circulation pump 29. A stirrer 25 is provided at the bottom of the denitrification tank 24, and stirs and mixes the foam (scum) 7 with the circulating liquid. Then, when a mixed liquid of an allowable amount or more is stored in the denitrification tank 24, it flows into the nitrification tank 27 through the partition wall 26. In the nitrification tank 27, an air diffuser 31 for maintaining the inside of the tank in an aerobic state, a blower 30 for sending air thereto, a separation membrane 12 installed above the air diffuser 31 and a separation membrane 12 are provided. A suction pump 13 is installed to suck the membrane separation treatment water. The mixed liquid flowing into the nitrification tank 27 is separated into membrane-treated water 11 and activated sludge by the separation membrane 12 and the suction pump 13 while being agitated and agitated, and the treated water 11 is treated by the membrane separation activated sludge treatment tank 10. Released outside. The suction pump 13 is activated when the water level in the nitrification tank 27 reaches HWL (upper limit water level), and is stopped when the 7J position becomes LWL (lower limit water level). [0018] Using the wastewater treatment method and the wastewater treatment apparatus of the present invention, blood and meat fragments generated during fish landing, washing, thawing frozen fish, and demolition of fish, which are not currently treated, are included. Pollutant components can be separated from large amounts of organic wastewater in a short time. Furthermore, the pollution load of seawater re-discharged to the ocean can be reduced by treating the treated wastewater with microorganisms.

[0019] [Test Example]

Next, the results of a wastewater treatment test based on the present invention are shown below. Using the test equipment shown in Fig. 5, under the following test conditions, the landing and unloading wastewater collected from the fishing port was treated in a foam separation tank and a membrane separation activated sludge treatment tank. The results are shown in Table 1. Test condition;

Foam separation tank: Self-priming foam separation tank (effective volume 25L, residence time 30 minutes)

Membrane separation activated sludge treatment tank: Installed only nitrification tank (effective capacity 5L, residence time about 12 hours) Foam separation tank treated water volume: 50L / hour

Foam generation amount: about 420ml / hour

Membrane filtration water volume: about 420ml / h (intermittent operation by 7 tank water level)

The separation membrane module: membrane area 0. lm ^2, flux 0. lmVm ² - day

[0020] [Table 1]

[0021] In the table, C〇D¾JIS K0102 19 Oxygen consumption by alkaline potassium permanganate, turbidity KIIS K0101 9.2 Transmitted light turbidity (wavelength 660 nm), and protein is measured by a spectrophotometer. It was measured by an absorption spectrum (wavelength 280 nm).

Next, the pollution concentration of the untreated wastewater at the fishing port was measured. The results are shown in Table 2.

[Table 2] Items Turbidity (1) Protein (1) Wastewater discharged to the ocean 36.7 0.085 0.461 [0024] As is clear from the results in Tables 1 and 2, the pollution load of the wastewater is reduced by about 50% by the wastewater treatment of the present invention, and the removed pollutant is treated with about 97.5% activated sludge. Was confirmed.

Example 2

In FIG. 6, reference numeral 1 denotes organic wastewater mainly composed of seawater generated from a fishing port, a fish market, an onshore farm, and the like. Pretreatment such as removal of solids is performed. The pretreated wastewater 4 is introduced into the foam separation tank 5 and is aerated for a certain time by the self-priming microbubble generator 16 in the foam separation tank 5 to be subjected to foam separation processing. Since the self-priming microbubble generator 16 can change the amount of intake air, the size of bubbles can be changed. The size of the bubbles generated here is 1 mm or less. Further, in this embodiment, an example of a self-priming microbubble generator is shown, but a diffuser may be used, and there is no particular limitation as long as it generates microbubbles. The foam 7 floating on the water surface of the foam separation tank 5 is removed by a known wiper or the like, and is discharged from the foam discharge port 6. Here, in the foam separation tank 5, since the wastewater 4 needs to stay in the tank for a certain period of time, the wastewater 4 that exceeds the capacity of one foam separation tank 5 must be treated! In the case of / ヽ, the wastewater 4 may be measured in advance in a distribution measuring tank (not shown) and distributed to a plurality of foam separation tanks 5 for treatment. Since the pollution load of the aerated water 8 aerated in the foam separation tank 5 has been sufficiently reduced, it is usually possible to discharge the water as it is.Furthermore, it can be oxidized by contact with ozone gas or mixed with a coagulant. It is more preferable to conduct the sedimentation separation treatment by leading to the coagulation sedimentation tank, or to introduce into the contact aeration tank and perform microbial treatment to further reduce the pollution load and discharge.

[0026] On the other hand, the properties of the foam 7 separated from the wastewater 4 have a higher pollutant load concentration than the wastewater 4, but the pollutant concentration is almost constant, which is extremely large compared to the amount of water before the aeration treatment. Since the amount is small, it is suitable for activated sludge treatment. The foam 7 discharged from the foam discharge port ⁶ by the extractor is introduced into a membrane separation activated sludge treatment tank 10 by a transfer pump 9, where the activated sludge is treated. The activated sludge is sucked by the suction pump 13 through the membrane 12 to be subjected to membrane separation, and is discharged as clear membrane separation treated water 11. Microfiltration membrane or ultrafiltration membrane is used as the type of membrane used for the separation membrane 12. As the shape of the membrane, a sheet-like flat membrane or a tubular hollow fiber membrane can be used, but is not particularly limited.

[0027] The excess sludge 14 in the membrane separation activated sludge treatment tank 10 is introduced into a culture tank 35 in which benthic organisms 32 are cultured by suction and discharge means such as a pump. The culture tank 35 is filled with sand 39, which is a filtering material, and the bottom is provided with a communication hole that does not allow the sand to fall off and is permeable to water, or a non-woven fabric is installed at the bottom of the sand. 38, an air diffuser 36 that supplies air into the culture tank using air sent from the blower 37, and a circulation pump 34 that appropriately returns the filtered water in the culture tank 35 to the container 38. I have. Here, the through hole and the Z or nonwoven fabric are installed at the bottom of the container 38, but they can also be installed on the side surface, and are not particularly limited. The container 38 is not particularly limited as long as it can be configured to discharge the seawater generated after the excess sludge is filtered and digested and reduced.

The pretreated wastewater 4 is supplied from the lower part of the foam separation tank 5 and is aerated by the self-priming microbubble generator 16 in the separation tank. The bubbles generated by the fine bubble generator float and move toward the foam discharge port 6 while adhering organic matter and fine suspended matter in the wastewater 4 in the foam separation tank 5 to the bubble surface. A foam layer 7 is formed on the water surface near the outlet 6. The foam layer 7 is discharged to the outside of the foam fractionating room 5 by a conventionally known wiper. On the other hand, the treated water 8 from which the foam has been separated after aeration is dripped from the outlet 6, and is discharged to the outside of the foam separation tank 5 through the lower part of the plate dividing the foam separation tank 5 內.

[0029] The foam 7 generated in the foam separation tank 5 is sent to a membrane separation activated sludge treatment tank 10 by a transfer pump 9. In the treatment tank 10, the organic matter in the separated foam 7 is converted into biological matter by activated sludge.

Then, solid-liquid separation into activated sludge and treated water 11 is performed by the separation membrane 12 and the suction pump 13. An air diffuser 17 for supplying the air supplied from the blower 16 into the treatment tank 10 is installed in the treatment tank 10, and simultaneously supplies oxygen to the activated sludge and cleans the separation membrane 12 with air.

On the other hand, the foam 7 is subjected to activated sludge treatment, and the excess sludge 14 that has become excess is introduced into the upper portion of the sand filled in the container 38 by a conventionally known pump or the like. The surplus sludge 14 introduced has a structure in which a solid content is filtered by a filter medium 39, and filtered water flows out from a lower part of the container 38 into a culture tank 35. Gokai 32 is bred in the filter media 39 inside the container 38. When the excess sludge 14 is introduced and the solid matter is captured by the filter medium 39, the solid matter is digested and reduced as feed for the creature 32. On the other hand, the seawater filtered by the sand is transferred to the aquaculture tank 35, where the air is supplied by the air diffuser 36 to increase the dissolved oxygen content, and is sent to the container 38 by the circulation pump 34. In the present example, the benthic organism was used as a benthic organism, but other sediment-eating benthic organisms may be used, or a suspended food-eating benthic organism represented by bivalves may be used. You may use a mixture of benthic organisms

[0031] Here, the water level in the aquaculture tank 35 is increased due to the transfer of the excess sludge introduced by 14 S, but the water level is detected using a conventionally known water level detector (not shown), and the water level is maintained at a certain level. When the water level reaches, you can open the water level adjusting pulp '33 at the bottom of the tank and lower the water level to the normal level. As another water level adjusting means, use an overflow pipe 40 as shown in Fig. 7! / You may use it depending on the height of the outflow destination.

[0032] With the processing method and the processing apparatus of the present invention, the processing is currently performed! / Pana fishing port, fish market, landing of fish at land farms, washing of fish, thawing of frozen fish, and only pollutants from organic wastewater mainly composed of seawater, including blood and meat fragments generated when fish are dismantled Is separated in a short time and the next! Microbial treatment of wastewater separated in /, can reduce the pollution load flowing into the ocean, and the excess sludge generated by microorganisms can be represented by sedimentary edible benthic organisms such as creatures and / or bivalves The final sludge disposal cost can be reduced by reducing the amount of suspended sludge by using it as feed (feed) for edible benthic organisms. In the present embodiment, the organic wastewater containing seawater as a main component has been described. However, as long as the wastewater is caused by the treatment of fish, the object to be treated such as seawater or freshwater is not particularly limited.

[0033] When treating the wastewater from the P-room upper aquaculture farm, since the wastewater does not contain large solids or contaminants such as sand, the wastewater coming out of the aquaculture tank is directly foam-separated. It is put into the tank 5 and can be treated by the method described above.

Next, using the test apparatus shown in FIG. 8, a treatment test of organic wastewater and organic sludge was performed based on the method of the present invention.

A foam separation tank is installed in the actual fish market wastewater treatment facility F consisting of a pretreatment tank, a flow control tank 8, a contact aeration tank C, and a sedimentation tank D, and inflows wastewater to the wastewater treatment facility P. The volume adjustment tank B is also transferred to the foam separation tank 5 by a pump, aerated, and a part of the generated foam is temporarily stored in the foam storage tank 41, and then put into the small-scale membrane separation activated sludge treatment tank 10. After performing the activated sludge treatment, 40 ml of the activated sludge was collected and fed once a day to the culture tank 35, where Pokai 32 was bred. Water quality was measured for wastewater transferred from the flow control tank B, aerated water, generated foam, and treated water of membrane separation activated sludge. The results are shown in Table 3.

[0035] test equipment and test conditions;

Foam separation tank: Self-priming foam separation tank, effective capacity 600L, residence time 120 minutes

Membrane separation activated sludge treatment tank: denitrification tank, nitrification tank installed, effective capacity 15L

Residence time: about 5 days

Water treatment volume of foam separation tank: 300L / hour

Foam generation: about 15L / hour

Membrane filtration water volume: Approximately 125LZ, intermittent operation by ice tank water level)

The separation membrane module: membrane area 0. lm ^2, flux 0. 03mVm ² - day

Aquaculture tank: 5L flask (effective volume 3L), container 0.5L, weight of squid 20g

Surplus sludge input to aquaculture tanks: Approx. 3 g / day (dry matter) (wet state .'40 mlZ day)

[Table 3]

[0037] In the table, COD ^ JIS K0102 19 Oxygen consumption by alkaline potassium permanganate, turbidity is measured by FTU turbidity meter of DR2000 manufactured by HACH, and protein is measured by Lowry-Fol in method. (Wavelength 750 nm) and the concentration in water was calculated from the calibration curve.

[0038] As is apparent from Table 1, the treatment method of the present invention reduces the pollution load of wastewater by about 78%, and the removed pollutant components are treated by activated sludge by about 96%! /, It was confirmed. [0039] Regarding the degree of sludge digestion and weight loss by the creatures, the degree of predation of the sludge caught by filtration was visually observed. The progress is shown in FIGS. 9 and 10. Fig. 9 is a photograph of the inside of the aquaculture tank one hour after the activated sludge was injected, and Fig. 10 is a photograph of the inside of the aquaculture tank approximately one day after the activated sludge was introduced. As can be seen from these photographs, approximately one day after the input of activated sludge, almost all of the input sludge was eaten by Gokai. The larvae cultivated in this way can also be used as fishing baits.

Industrial applicability

[0040] As described above, the wastewater treatment method and apparatus of the present invention can enable purification treatment of organic wastewater generated in large quantities at fishing ports, fish markets, and the like. This can greatly contribute to the prevention of noise.

The treatment method and apparatus of the present invention can reduce the pollution load of re-discharge wastewater by about 80%. In addition, by preserving sludge by benthic organisms such as moss and reducing digestion, it is not necessary to incinerate the final residue, so that it is not only possible to reduce the maintenance cost of the treatment facility, but also to save resources such as fossil fuel Can be part of In addition, since the larvae cultivated by the method of the present invention can be used as fishing baits, they can greatly contribute to resource saving and resource recycling.

Claims

The scope of the claims

[1] A method for treating organic wastewater generated at fishing ports, fish markets, etc., in which wastewater from which solids such as fish meat pieces have been removed is aerated and foam generated by the aeration is treated with activated sludge. A method for treating organic wastewater generated from fishing ports, fish markets, etc., characterized by membrane filtration.

[2] An organic wastewater treatment device that generates power at fishing ports and fish markets, etc., and a foam separation tank into which wastewater from which solid substances such as fish meat pieces have been removed is introduced, and a wastewater separation tank installed in the foam separation tank. An apparatus for treating organic wastewater generated from a fishing port, a fish market or the like, characterized by having a bubble generating means for generating fine bubbles in water and a membrane separation activated sludge treatment tank into which the generated foam is introduced.

[3] The apparatus for treating organic raw wastewater generated from a fishing port or a fish market according to claim 2, wherein the bubble generating means is a self-priming fine bubble generating apparatus.

[4] Accept organic wastewater generated from fishing ports, fish markets, mud farms, etc. and treat it biologically.

Introducing excess organic sludge generated after biological treatment into a culture tank in which benthic organisms are bred, and treating the excess organic sludge as feed for the benthic organisms for digestion and weight reduction. Organic sludge treatment method.

[5] The method for treating organic sludge according to claim 4, wherein the biological treatment is performed by an activated sludge method.

[6] A device for treating organic wastewater and organic sludge generated from a fishing port, a fish market, a land farm, etc., wherein a wastewater from which solid matter such as fish pieces has been removed is introduced, A bubble generating means installed in the foam separation tank to generate fine bubbles in waste water; a membrane separation activated sludge treatment tank into which foam generated in the foam separation tank is introduced; and a membrane separation activated sludge treatment tank. An apparatus for treating organic wastewater and organic sludge, comprising: a culture tank in which surplus organic sludge generated is introduced and benthic biomass is bred.

[7] The method for treating organic sludge and the method for treating organic wastewater according to any one of claims 4 to 6, wherein the culture tank is filled with a filtering material such as sand to obtain filtered water.ぴ Organic sludge treatment equipment.

[8] The benthic organism is a sedimentary benthic benthic and a Z or suspended sedimentary benthic 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, characterized in that: