JP4866595B2 - Method and apparatus for treating deposits such as shellfish - Google Patents

Description

  The present invention relates to a method and apparatus for treating deposits such as shellfish. More specifically, the present invention relates to a method and an apparatus for treating a deposit containing a mixture of an inorganic substance and an organic matter such as shellfish, algae, and sludge at a low cost without performing a treatment such as washing or crushing. About.

  In environments where shellfish are prone to occur, such as thermal power plants, nuclear power plants, or seawater intake or discharge channels of factories, organisms such as shellfish attach to the intake channel to reduce the intake capacity and release it. There is a problem that the cooling efficiency of a condenser or the like is reduced by reducing the water discharge capacity by blocking the water channel. Therefore, an operation of periodically collecting deposits such as shellfish is performed. Collected deposits such as shellfish have been landfilled in the site of the facility after incineration or without incineration, but there have been problems such as bad odor and lack of landfill. Further, there are cases where deposits such as shellfish collected by entrusting to an industrial waste disposal contractor are entrusted, but the entrusting treatment cost is very high, which is a great economic burden.

In order to solve the above-mentioned problems and to make effective use of shells and the like, there are power plants and the like that are processed by a removal shell processing facility (manufactured by Toshiba). The facility has storage / washing / crushing / dehydration equipment, washing shell fermentation treatment equipment, dewatered sludge fermentation treatment equipment, crushing and shipping equipment, wastewater treatment equipment, and deodorization treatment equipment. In the storage, washing, crushing, and dewatering facilities, the removed shells stored in the storage tank are washed and separated into shells and sludge, and the shells are further crushed and dehydrated. In the washed shellfish fermentation treatment facility, the washed shellfish obtained from the storage, washing, crushing, and dewatering facilities are fermented at high speed in a fermenter to decompose the shellfish. In the dewatered sludge fermentation treatment facility, the sludge separated from the shells removed by the storage, washing, crushing and dewatering facilities is dehydrated and then fermented at high speed. In the crushing and shipping equipment, after crushing the shellfish fermented product and the sludge fermented product, the foreign matter is removed and packed in a flexible container so that it can be shipped as a soil conditioner. In the wastewater treatment facility, the water obtained when the sludge is dehydrated in the dewatered sludge fermentation treatment facility is rendered harmless and discharged. In the deodorization equipment, the generated odor is adsorbed and removed by an ammonia cleaning tower and an activated carbon tower and then released to the atmosphere. The removal shell processing facility has a processing capacity of 8 m ³ / day, and the processing of 200 m ³ , which is the average total amount of deposits such as shellfish collected at the time of periodic collection, is completed in about 1 to 2 months.

In addition, a method and an apparatus for treating waste by bringing waste containing fish and shellfish into contact with a sludge mixed solution containing activated sludge under aerobic conditions have been proposed (Patent Documents 1 and 2). Specifically, a waste containing seafood is put in a basket or the like, and the basket is accommodated in a state where a space can be formed in the processing tank and diffused from below, or the basket is processed into the processing tank. By placing the sludge mixture on the top and outside of the treatment tank and sprinkling the sludge from above the waste, the mud etc. adhering to the waste is washed away and the passage of the sludge mixture is secured in the waste layer, We try to break down seafood efficiently.
JP 2000-296384 A JP 2000-296385 A

When the above-mentioned removal shell processing facility is added to a power plant or factory, the equipment cost is enormous, but the collection of deposits such as shellfish at the power plant or factory is about once every two years, even in many places. in a situation that is performed only about once, and since the end with averaging of 200 meters ³ is a total amount of about one to two months of deposits such as shellfish to be harvested at the regular recovery, huge facilities However, the operation period is small and wasteful. Therefore, it is possible to reduce initial capital investment, running cost, energy use, and processing process by treating it slowly enough to complete the decomposition process by the time of collection of deposits such as shellfish one year or two years later. If it is possible to eliminate a part of the recovered material, for example, the washing and crushing process of the recovered material, it can be said that it is desirable rather than investing a huge amount of equipment to decompose the recovered material at high speed.

  Here, the techniques disclosed in Patent Documents 1 and 2 can be performed at a very low cost. However, even when organic shellfish and the like are decomposed with activated sludge, inorganic shells and the like are decomposed. hard. If inorganic substances such as shells remain, a process for treating them will be required separately. Even in the above facilities, it takes time and effort to separate shellfish and shellfish in advance, and shellfish obtained after processing shellfish etc. are shipped as a soil conditioner, but it is difficult to sell. is the current situation. Therefore, it is desirable to decompose and extinguish inorganic substances such as shells or greatly reduce the volume.

  Therefore, the present invention makes it possible to simultaneously perform decomposition processing of organic matter in deposits such as shellfish and decomposition / volume reduction processing of inorganic shells and the like, and does not require processing such as washing and crushing. An object of the present invention is to provide a simple processing method and apparatus.

In order to achieve this object, the deposit treatment method according to claim 1 is a method of disposing of deposits including sludge and shellfish collected from a structure into which seawater flows, and a treatment tank into which deposits are charged. Fresh water is introduced to maintain the pH of the treatment tank at 6 or more and less than 7, so that the inorganic substances in the deposits are decomposed and embrittled, and the organic substances in the deposits are decomposed by microorganisms contained in the sludge. In addition, the treatment apparatus for deposits according to claim 7 is a device for discarding deposits including sludge and shellfish collected from a structure into which seawater flows, and a treatment tank for depositing deposits, and a treatment tank. A means for introducing fresh water and a pH detector for detecting the pH in the treatment tank and maintaining the pH in the treatment tank at a desired value are provided in the treatment tank in which the deposits are introduced by the means for introducing fresh water. Fresh water is introduced and the pH of the treatment tank is maintained at 6 or more and less than 7, the inorganic substances in the deposits are decomposed / brittle and the organic substances in the deposits are decomposed by microorganisms contained in the sludge. .

Deposits including sludge and shellfish are recovered from a structure into which seawater flows, for example, a thermal power plant, a nuclear power plant, or a seawater intake channel or a discharge channel of a factory as described in claim 5. This deposit contains organic matter such as shellfish, algae and sludge, and inorganic matter such as shells. By introducing fresh water into the treatment tank and maintaining the pH of the treatment tank at 6 or more and less than 7, microorganisms Decomposition of organic substances occurs due to, and inorganic substances such as shells are also decomposed. Therefore, for example, shellfish such as snails and bivalves, in which most of the shellfish is present inside the shell, can be efficiently decomposed, and inorganic substances such as shells are exposed to fresh water having a pH of 6 or more and less than 7 for a long time. Therefore, the time and effort required for processing shells and the like can be completely or greatly reduced.

Here, as described in claim 4, fresh water is intended life, including waste, industrial waste water, at least one of tap water or river water.

Domestic wastewater, industrial wastewater, tap water or river water generally has a pH of 6 to less than 7. Therefore, if only fresh water is introduced into the treatment tank, the treatment tank becomes an acidic environment having a pH of 6 or more and less than 7 . In addition, industrial wastewater generated from power plants and factories also includes highly acidic wastewater having a pH of less than 6, such as denitration wastewater, which can be further introduced to further lower the pH of the treatment tank. It is. Therefore, as described in claims 6 and 10, after the decomposition treatment of the organic matter in the deposit is completed, fresh water with high acidity is introduced into the treatment tank to maintain the pH of the treatment tank at less than 6, It is also possible to promote the decomposition and embrittlement of the inorganic substance in the kimono. In addition, some of the wastewater, industrial wastewater, tap water or river water having a pH of 7 or more exist. In this case, the introduction of industrial wastewater with high acidity (low pH) can It is also possible to make the pH of the acidic environment less than 7 and to make the pH less than 7 by further introducing an acid. By making the treatment tank acidic in this way, it is also possible to neutralize ammonia that is the cause of malodor and suppress the occurrence of malodor.

Further, as described in claim 3, in the processing method of the deposit of the present invention, it is preferable to activate the aerobic microorganisms present in the process by aerating the treatment tank vessel. Further, as described in claim 9 , the depositing apparatus according to the present invention further includes a means for introducing and aeration of air into the processing tank, and the inside of the processing tank is aerated to It is preferable that the aerobic microorganism is activated. Thereby, the aerobic microorganisms in a processing tank fully function, and the decomposition | disassembly efficiency of the organic substance in the deposit | attachment containing shellfish improves. Furthermore, the inorganic substance such as shells is broken by physical impact due to aeration, so that the decomposition efficiency of the inorganic substance is improved. Moreover, generation | occurrence | production of a bad odor is suppressed, and the introduce | transduced fresh water is purified and BOD (biochemical oxygen demand) reduces.

Here, as described in claim 2 , in the deposit treatment method of the present invention, a microorganism for decomposing the organic matter in the deposit is added to the treatment tank, and the microorganism and the microorganism contained in the sludge are added. It is preferable to decompose the organic substance in the deposit by using in combination. According to the eighth aspect of the present invention, in the depositing apparatus according to the present invention, a microorganism for decomposing the organic matter in the deposit is added to the treatment tank, and the microorganism and the microorganism contained in the sludge are used in combination. Thus, it is preferable that the organic matter in the deposit is decomposed.

Various aerobic or anaerobic microorganisms exist in the sludge, and the organic substances in the deposits including shellfish by the action of the aerobic microorganisms in the aerobic environment and the anaerobic microorganisms in the anaerobic environment. Is decomposed. That is, it is possible to decompose organic matter such as shellfish only with microorganisms present in the sludge in the deposit. Of course, it may be used in combination with sludge in with kimono microorganisms such as is possible, for example, Bacillus bacteria to decompose the organic matter. Further, the microorganism may be used in the form of sludge other than sludge in deposits, it may be used in combination with the sludge in with kimono this.

Further, as described in claim 11, in the depositing apparatus according to the present invention, the processing tank is installed in a power plant or factory site, and the supernatant of the processing tank is an auxiliary facility of the power plant or factory. The wastewater treatment tank and / or nitrogen-containing wastewater treatment equipment was introduced and the wastewater treatment in the wastewater treatment tank and / or the nitrogen-containing wastewater treatment in the nitrogen-containing wastewater treatment equipment was performed to discharge wastewater that meets the environmental standards It is preferable that The power plant or factory has a wastewater treatment tank and nitrogen-containing wastewater treatment equipment as ancillary equipment. By installing a treatment layer in the power plant or factory site, a new wastewater treatment tank and nitrogen-containing wastewater treatment equipment are installed. Even if it is not provided, it is possible to discharge the wastewater to the sea after treatment with these.

Furthermore, as described in claim 12 , in the treatment apparatus for deposits according to the present invention, the treatment tank is installed in a power plant or factory site, and the treatment tank contains excess heat discharged from the power plant or factory. steam is introduced, the temperature in the processing tank is preferably to those to be retained to a temperature to activate the action of microorganisms. Therefore, the decomposition efficiency of organic matter such as shellfish is improved.

  According to the present invention, it is possible to decompose not only organic substances present in deposits including shellfish but also inorganic substances such as shells without performing troublesome processes such as washing and crushing, and most of the shellfish However, it is possible to efficiently decompose shellfish such as snails and bivalves existing in the shell. In addition, since inorganic substances such as shells are decomposed and extinguished by being exposed to an acidic environment for a long time or become brittle and reduced in volume, the labor required for processing shells and the like is completely or greatly reduced. Furthermore, since ammonia, which is a cause of malodor generated during the decomposition treatment, is neutralized in an acidic environment, generation of malodor can be suppressed. Further, the processing apparatus is simple and simple in that a processing tank and a means for introducing fresh water are provided, and is very low cost.

In addition, various aerobic or anaerobic microorganisms exist in the sludge in the deposits including shellfish, etc., and the anaerobic microorganisms act under an aerobic environment, By this, the organic matter in the deposit including shellfish is decomposed. That is, it is possible to decompose organic matter such as shellfish only with microorganisms present in the sludge in the deposit. Also, to improve the decomposition efficiency be used in combination with the sludge in with kimono microorganisms such as is possible, for example, Bacillus bacteria can be decomposed organic matter. Moreover, decomposition efficiency improves also by using together with sludge other than the sludge in a deposit.

  Furthermore, aeration of the treatment tank to activate aerobic microorganisms improves the decomposition efficiency of organic substances present in the deposits including shellfish, and the inorganic substances in the deposits are crushed by physical impact due to aeration. Decomposition efficiency is improved. Moreover, generation | occurrence | production of malodor is also suppressed. Furthermore, since fresh water introduced into the treatment tank is purified and BOD (Biochemical Oxygen Demand) is greatly reduced, there is no need to perform BOD reduction treatment separately, and environmental standards other than BOD are sufficiently met. Can discharge wastewater directly into the sea. When the environmental standard is not satisfied, it may be discharged to the sea through a wastewater treatment tank and / or a nitrogen-containing wastewater treatment apparatus. In addition, facilities such as thermal power plants, nuclear power plants, and factories have wastewater treatment tanks and nitrogen-containing wastewater treatment equipment, and they can be processed in parallel without providing a new wastewater treatment facility. So you can save time.

  Hereinafter, the configuration of the present invention will be described in detail based on the best mode shown in the drawings.

  FIG. 1 shows an embodiment of an apparatus for treating a deposit containing shellfish of the present invention. This processing apparatus has a processing tank 2 for containing deposits 10 including shellfish, a line 3 for introducing fresh water into the processing tank 2, and an air introduction line 6 for aeration of the processing tank 2.

  The deposit 10 including shellfish is processed by being put into the processing tank 2. Fresh water is introduced into the treatment tank 2 from the line 3. Here, the deposit 10 containing shellfish may contain seaweed, jellyfish, etc. in addition to shellfish and sludge.

  The size and shape of the treatment tank 2 are not limited as long as the treatment tank 2 can sufficiently immerse the recovered material. The material may be made of concrete, but is not limited thereto.

As an example, the total amount of deposits including shellfish collected at the time of periodic collection from the seawater intake channel wall of the thermal power plant is about 200 m ³ on average. Therefore, when the water depth of the treatment tank is 2 m and the treatment is performed in the depth range of 0.5 to 1.5 m, a treatment tank having a size of 15 m in length, 15 m in width, and 2 m in height can be sufficiently treated. It is preferable.

  Here, as shown in FIG. 1, the processing tank 2 is preferably partitioned into 2a, 2b, 2c, and 2d sections. By partitioning the treatment tank 2 in this way, it is possible to use, for example, only the first treatment tank according to the amount of the deposit 10 containing shellfish collected. That is, when the amount of the deposit 10 containing shellfish is small, the deposit containing the aerobic microorganisms and shellfish in the sludge is used in the narrow treatment space such as the tank 2a rather than using the entire treatment tank 2. The probability of contact with the organic matter in 10 increases, and the decomposition efficiency increases.

  When the deposit 10 containing shellfish is put into the treatment tank 2 for processing, the deposit 10 containing shellfish is put in the liquid-permeable container 8 and then immersed in the treatment tank 2. The liquid-permeable container 8 is, for example, a stainless steel basket and has a size that can be immersed in the treatment tank 2. When the treatment tank 2 is partitioned into 2a, 2b, 2c, and 2d compartments as in the present embodiment, the size may be set so as to be immersed in each compartment. The size of the liquid-permeable hole of the liquid-permeable container 8 needs to be small enough not to spill out when the volume of the shell or the like, which is an inorganic substance, is reduced, and needs to be large enough for the liquid to pass. For example, the size may be about 20 cm, preferably about 10 cm, and more preferably about 5 cm. Moreover, the side surface or the bottom surface of the liquid-permeable container 8 can be opened and closed, and the deposit 10 including shellfish is inserted from here.

  As an example of a method for transporting the liquid-permeable container 8, for example, a wire rope that receives a hook of a crane is provided on the upper surface of the liquid-permeable container 8, and the liquid-permeable container 8 is lifted and transported by the crane. After the liquid-permeable container 8 is transported to the treatment tank 2 by a crane, the liquid-permeable container 8 is lowered by the crane and immersed in the treatment tank 2.

  Examples of a method for supporting the liquid-permeable container 8 include a method of hanging the lid 4 with a rope or the like, but is not limited thereto.

  After the liquid-permeable container containing the deposit 10 containing shellfish is immersed in the processing tank 2, the processing tank 2 is covered with the lid 4 in this embodiment. The lid 4 is provided with a vent hole 4a, and a deodorizing device 5 is provided in the vent hole 4a. Since the odor generated in the processing tank 2 is deodorized by the deodorizing device 5 when passing through the vent hole 4a, the odor hardly leaks outside the processing tank 2. In addition, as a deodorizing apparatus 5, although what is necessary is just to use a commercially available ozone generator etc., for example, it is not restricted to this. Moreover, you may make it provide the deodorizing apparatus 5 in the position which is not immersed in the back side of the lid | cover 4, or the water inside the processing tank 2. FIG.

  Aerobic microorganisms exist in the sludge contained in the deposit 10 containing shellfish. Therefore, by aeration of the treatment tank 2, aerobic microorganisms in the sludge are activated to become activated sludge. Furthermore, the deposit 10 containing the shellfish is agitated by bubbles generated during aeration, and the organic matter contained in the deposit 10 containing the shellfish can be efficiently decomposed, and further, by physical impact by stirring. Inorganic materials such as shells can be crushed. Aeration is performed by introducing air from the air introduction line 6 and diffusing through the air diffuser 6a. For example, a porous diffuser may be used as the air diffuser 6a, but is not limited thereto. In the present embodiment, the air introduction line 6 and the air diffuser 6a are provided only at the bottom of the processing tank 2 so as to aerate from the bottom of the liquid-permeable container 8. By providing an air introduction line and a diffuser so as to aerate from the side and top, the contact probability between the organic matter in the deposit 10 including the shellfish and the aerobic microorganisms in the sludge is increased, and more agitation is performed. As a result, it becomes easy to give a physical impact to an inorganic substance such as a shell, so that the decomposition efficiency is increased.

The fresh water is introduced into the treatment tank through the pipe 3 by a pump or the like, for example. The amount introduced may be about 10 m ³ / day in the case of the treatment tanks of 15 m in length, 15 m in width and 2 m in height as described above, but is not limited to this amount. It is determined appropriately depending on the acidity.

  Here, the fresh water introduced into the treatment tank 2 is at least one of domestic wastewater, industrial wastewater, tap water or river water. These fresh waters generally have a pH of 6 or more and less than 7. Therefore, if only fresh water is introduced into the treatment tank, the treatment tank becomes an acidic environment. In addition, industrial wastewater generated from power plants and factories also includes highly acidic wastewater having a pH of less than 6, such as denitration wastewater, which can be further introduced to further lower the pH of the treatment tank. It is. Here, since there are those having a pH of 7 or more in domestic wastewater, industrial wastewater, tap water or river water, in this case, by introducing industrial wastewater with high acidity (low pH), It is possible to make the whole pH less than 7 to be an acidic environment, or it is possible to make the pH less than 7 by further introducing an acid. The pH value in the treatment tank 2 is detected by a pH detector 13 installed in the treatment tank 2 so as to maintain a desired pH value.

When the pH is increased and the acidity is increased, calcium is easily dissolved from the shell, which is an inorganic substance, and the embrittlement of the shell is promoted. There is a possibility that the function of microorganisms that decompose organic shellfish may be reduced. On the other hand, when the acidity is lowered by bringing the pH close to 7, the dissolution of calcium from the inorganic shell is less likely to occur, but the function of microorganisms that decompose the organic shell is enhanced, It becomes easier to be decomposed. That is, it is preferable to maintain the pH of the treatment tank 2 at 6 or more and less than 7, so that inorganic substances such as shells and organic substances such as shellfish are easily decomposed together. Alternatively, when processing shellfish with a lot of shellfish covered with shells, first, the pH is lowered, for example, less than 6 to promote decomposition and embrittlement of the shells with increased acidity, It is also possible to efficiently decompose both the shell and shellfish by raising the pH to about 6. Alternatively, after decomposing organic matter such as shellfish at a pH of 6 or more and less than 7, decomposition and embrittlement of inorganic materials such as shells can be promoted in a state where the pH is less than 6 and the acidity is increased.

  If fresh water continues to be introduced into the treatment tank 2, the water overflows from the treatment tank 2. In this embodiment, the water is discharged through the overflow line 7 piped on the upper side of the treatment tank 2. The discharged water, that is, the supernatant water is purified by activated sludge and has a particularly low BOD (biochemical oxygen demand) value. Therefore, if the environmental standards are satisfied, the water may be discharged into the sea area as it is. In addition, when N (nitrogen), P (phosphorus), and COD (chemical oxygen demand) concentrations are high, they are treated by a wastewater treatment tank and / or nitrogen-containing wastewater treatment equipment installed in a power plant or factory. The water should be discharged into the sea area. At this time, decomposed inorganic components such as shells are also discharged into the sea area. In other words, it is an environmentally friendly process of returning the thing derived from the sea to the sea. If the water in the treatment tank 2 always overflows, the introduced fresh water may not be sufficiently purified. Therefore, the overflow line 7 is closed for a certain period of time so that the water does not overflow from the treatment tank 2. It may be allowed to overflow after the amount is accumulated.

  Here, it is preferable that surplus heat or steam discharged from the power plant or factory is introduced into the treatment tank 2 and the introduced fresh water is maintained at a temperature that activates the activity of microorganisms. By activating the activity of microorganisms in the sludge, the decomposition efficiency of the organic matter contained in the deposit 10 including shellfish is improved. Since there is abundant surplus heat or steam discharged from power plants or factories, cost can be reduced by effectively using surplus heat or steam discharged from these facilities. For example, in this embodiment, a steam introduction line 9 for introducing steam generated from these facilities and a temperature detection device 12 for detecting the temperature in the treatment tank 2 are provided, and the activity of microorganisms activates the temperature in the treatment tank. It is kept at 20 to 40 ° C., which is the temperature to be converted. Here, the steam introduction line 9 may be provided so as to heat the treatment tank 2, or the steam is introduced directly into the water in the treatment tank 2, or the steam is introduced onto the treatment tank 2. You may provide so that the water in 2 may be heated. Of course, it is possible to keep the introduced fresh water at a temperature at which the activity of microorganisms is activated by a heater or the like without using surplus heat or steam discharged in the power plant or factory.

  Here, the temperature in the treatment tank 2 may be 20 to 40 ° C. as described above, but is preferably 25 to 38 ° C., more preferably 30 to 36 ° C., and most preferably 35 ° C. It is. Thereby, the action of microorganisms in the sludge in the treatment tank 2 is improved and activated, and the decomposition efficiency is improved.

  By these series of treatments, organic matter such as sludge and shell meat is decomposed by activated sludge by the time of collecting the deposit 10 including shellfish one year or two years later, and inorganic matter such as shells is also completely decomposed. Disappears or remains a greatly reduced shell. Some sludge also remains. The residue is removed from the liquid container or left as it is to prepare for the decomposition treatment of the deposit 10 including new shellfish. Furthermore, in this embodiment, when the amount of sludge in the treatment tank 2 increases, the sludge is drawn from the sludge extraction line 11 piped to the bottom of the tank. However, the present invention is not limited to this method. The sludge may be extracted by performing the above process.

  Since the treatment apparatus 1 of the present invention is a simple facility consisting of only a water tank and a pipe, the initial investment is very low, and the running cost is low. Moreover, the deposit 10 containing shellfish can be removed without using a large site. It can be processed. Therefore, it can be easily introduced into a power plant or factory.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, in the present embodiment, the aerobic microorganisms in the sludge are aerated and activated to decompose the organic matter in the deposit 10 including the shellfish. When there is a large amount of organic matter relative to the amount, or when the deposit 10 contains almost no sludge containing microorganisms, or when it is desired to increase the decomposition rate, organic matter such as shellfish is decomposed in the treatment tank 2. An aerobic microorganism having a function may be added, or sludge containing aerobic microorganisms may be added to efficiently decompose the deposit 10 containing shellfish. For example, even when Bacillus, which is a microorganism that easily decomposes proteins, is placed in the treatment tank 2, the decomposition efficiency is further improved, and even when the sludge is hardly contained in the deposit 10 including shellfish. The decomposition process proceeds sufficiently. In addition, since organic substances contain proteins, carbohydrates, etc., degradation efficiency of organic substances in deposits including shellfish is improved by adding not only protein-degrading bacteria but also carbohydrate-degrading bacteria such as lactic acid bacteria. To do. In addition, since there are anaerobic microorganisms in the sludge, it is possible to decompose the deposit 10 containing shellfish without aeration, and in the sludge contained in the deposit 10 as described above. When the amount of organic matter relative to the amount of anaerobic microorganisms to be produced is large, or when the sludge containing microorganisms is hardly contained in the deposit 10, or when it is desired to increase the decomposition rate, the shellfish in the treatment tank 2 An anaerobic microorganism having an organic matter decomposing function such as an anaerobic microorganism may be added, or sludge containing an anaerobic microorganism may be added to efficiently decompose the deposit 10 including shellfish.

Further, the aeration efficiency may be increased by applying vibration or swinging to the liquid-permeable container 8 containing the deposit 10 containing shellfish vertically and horizontally. In this case, more vibration or rocking, cracked inorganic materials such embrittled shells, on the decomposition process is performed more efficiently, it is finely ground to facilitate the volume reduction by.

  The present invention is not limited to the decomposition treatment of deposits including shellfish recovered from a seawater intake or discharge channel of a thermal power plant, a nuclear power plant or a factory, and aquaculture and processing such as oysters and scallops. The present invention can also be applied to deposits and wastes including shellfish that are generated from fisheries, fish markets, food processing plants, and the like.

  In addition, the present invention is useful in the treatment of deposits including shellfish, but in some cases, deposits and waste that do not include shellfish, such as deposits and waste that contain both inorganic and organic matter. Applicable to processing of objects.

It is a figure which shows the outline of the processing apparatus of the deposit | attachment containing the shellfish of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Treatment apparatus 2 Treatment tank 3 Fresh water introduction line 6 Air introduction line 6a Air diffuser 7 Overflow line 9 Steam introduction line 10 Deposits including shellfish

Claims (12)

In a method for disposing of deposits including sludge and shellfish collected from a structure into which seawater flows, fresh water is introduced into the treatment tank into which the deposits are charged to maintain the pH of the treatment tank at 6 or more and less than 7. An inorganic substance in the deposit is decomposed and embrittled, and an organic substance in the deposit is decomposed by microorganisms contained in the sludge.   The deposit according to claim 1, wherein a microorganism for decomposing the organic matter in the deposit is added to the treatment tank, and the microorganism is decomposed by using the microorganism and the microorganism contained in the sludge together. Processing method.   The method for treating deposits according to claim 1 or 2, wherein the inside of the treatment tank is aerated to activate aerobic microorganisms in the treatment tank.   The said fresh water contains at least one of domestic wastewater, industrial wastewater, tap water, or river water, The processing method of the deposit | attachment as described in any one of Claims 1-3.   The said deposit | attachment is the processing method of the deposit | attachment as described in any one of Claims 1-4 collect | recovered from the seawater intake channel or the discharge channel of a thermal power station, a nuclear power plant, or a factory. After the decomposition treatment of the organic matter in the deposit is completed , fresh water having a pH of less than 6 is introduced into the treatment tank to maintain the pH of the treatment tank at less than 6, and the inorganic matter in the deposit is decomposed and embrittled. The processing method of the deposit | attachment as described in any one of Claims 1-5 made to promote. In an apparatus for disposing of deposits including sludge and shellfish collected from a structure into which seawater flows, a treatment tank for introducing the deposits, means for introducing fresh water into the treatment tank, and a pH in the treatment tank And a pH detection device that maintains the pH in the treatment tank at a desired value, and the fresh water is introduced into the treatment tank into which the deposit has been introduced by the means for introducing the fresh water. The deposit is characterized in that the pH of the tank is maintained at 6 or more and less than 7, the inorganic substance in the deposit is decomposed / brittle and the organic substance in the deposit is decomposed by microorganisms contained in the sludge. Processing equipment.   8. The attachment according to claim 7, wherein a microorganism for decomposing the organic matter in the deposit is added to the treatment tank, and the organic matter in the deposit is decomposed by using the microorganism and the microorganism contained in the sludge. Kimono processing equipment.   The depositing device according to claim 7 or 8, further comprising a means for introducing air into the treatment tank and aeration, wherein the inside of the treatment tank is aerated to activate aerobic microorganisms in the treatment tank. Processing equipment. After the decomposition treatment of the organic matter in the deposit is completed, fresh water having a pH of less than 6 is introduced into the treatment tank by the means for introducing the fresh water, and the pH of the treatment tank is maintained at less than 6, The apparatus for treating a deposit according to any one of claims 7 to 9, wherein decomposition and embrittlement of the inorganic substance are promoted. The processing tank is installed in the power plant or plant site, is introduced into the processing bath supernatant said plant or said plant ancillary facilities at which existing wastewater treatment tank and / or a nitrogen-containing wastewater treatment apparatus, wherein The waste material according to any one of claims 7 to 10, wherein wastewater treatment in a wastewater treatment tank and / or nitrogen-containing wastewater treatment in the nitrogen-containing wastewater treatment apparatus is applied to discharge wastewater that satisfies environmental standards . Processing equipment.   The treatment tank is installed in a power plant or factory site, surplus heat or steam discharged from the power plant or factory is introduced into the treatment tank, and the temperature in the treatment tank activates the activity of microorganisms The apparatus for treating a deposit according to any one of claims 7 to 10, wherein the depositing apparatus is maintained at a temperature of the deposit.

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