JP5580650B2 - Marine waste recycling plant - Google Patents

Description

  The present invention relates to a recycling plant for producing fuel from marine waste such as scallops (scallops).

  Heavy metals such as cadmium in seawater accumulate in scallop uro (midgut gland) and squid goro (internal organs), and may have high concentrations exceeding 100 ppm. Therefore, the waste and goro discharged in the process of marine processing are landfilled or incinerated as industrial waste.

  However, when urine or goro is disposed of in landfills, there are problems that odors are dissipated to the surroundings due to decay, and heavy metals are leached and contaminate the surrounding sea area and soil. In addition, when incineration of uro or goro is performed, there are problems that heavy metals vaporized by incineration diffuse into the atmosphere, and dioxins are generated by incineration of salt. Further, incineration disposal involves burning a relatively large amount of fossil fuel in order to incinerate high-moisture urine and goro, and has a problem of discharging a relatively large amount of greenhouse gases.

  Therefore, conventionally, in order to recover scallop uro heavy metals without flowing out or diffusing, uro is immersed in dilute sulfuric acid aqueous solution, heavy metals are leached into sulfuric acid aqueous solution, and flocculant is added to dilute sulfuric acid aqueous solution to add uro protein. In addition, a method has been proposed in which heavy metals are separated and recovered by electrolysis after aggregation and removal of lipids (see Patent Document 1).

  In this method, a flocculant is added to two immersion baths in which dilute sulfuric acid aqueous solution is retained and uro is sequentially immersed, and the immersion solution in which uro is immersed in the two immersion baths, and the protein and lipid are aggregated. A coagulation filtration device for removal and an electrolysis device for collecting heavy metals from the immersion liquid treated by the coagulation filtration device are used.

JP 2007-229618 A

  However, the method for recovering heavy metals by immersing urine in the dilute sulfuric acid aqueous solution requires an immersion tank, a coagulation filtration apparatus, and an electrolysis apparatus that handle the dilute sulfuric acid aqueous solution, which is a strong acid. There is a problem that it takes time to handle the sulfuric acid aqueous solution and the immersion liquid.

  Then, the subject of this invention is providing the plant which enables the recycling of marine waste with a comparatively simple apparatus and little effort.

In order to solve the above-mentioned problems, the fishery waste recycling plant of the present invention includes a reduced-pressure fermentation drying apparatus that ferments and dries aquatic waste in a reduced-pressure environment,
A molding apparatus for producing a solid fuel by mixing and molding a material to be processed by the above-described reduced-pressure fermentation drying apparatus and a combustible material formed from combustible waste;
A heavy metal removing device that removes heavy metal from at least one of a gas or a liquid generated during the dry fermentation treatment of marine waste by the reduced-pressure fermentation drying device and dust or gas discharged from the molding device is provided. It is said.

  According to the above configuration, marine waste having a water content exceeding 70% can be rapidly fermented and dried in a reduced pressure environment by the reduced pressure fermentation drying apparatus. Conventionally, the solid waste is produced by mixing and molding the material to be treated and the combustible material formed from the combustible waste with the molding equipment. Marine waste that has been used can be reused as fuel. Here, a heavy metal such as cadmium contained in the aquatic waste is mixed in the gas or liquid generated along with the dry fermentation treatment of the aquatic waste by the vacuum fermentation drying apparatus, and the dust or the gas discharged from the molding apparatus. In some cases, heavy metal is removed from at least one of these by a heavy metal removing device. As a result, marine waste containing heavy metals can be reused as fuel while reducing leakage of heavy metals to the environment. As a result, the consumption of petroleum fuel and the greenhouse effect when marine waste is incinerated Gas emission can be prevented. In addition, since marine waste can be reused without using dilute sulfuric acid, it is possible to reduce the complexity of the apparatus and the handling of the object to be processed.

  Here, in the dry fermentation treatment, heavy metals such as cadmium bound to the protein may be liberated by adding proteolytic bacteria to the marine waste and degrading the protein of the marine waste. In this case, it is preferable that the heavy metal liberated from the marine waste is reacted with sulfide ions to produce a hardly soluble heavy metal sulfide to be insolubilized. For this reason, in the dry fermentation treatment, sulfate-reducing bacteria may be added to the marine waste, and the released heavy metal is sulfided with hydrogen sulfide produced by the sulfate-reducing bacteria to form an insoluble heavy metal sulfide. Is preferred.

  In addition, the above-mentioned marine waste includes edible parts collected from fishery products, such as the midgut glands of scallops and other shellfish and the internal organs of squid, as well as jellyfish and starfish. This includes organisms that are caught in fishnets and are widely used to refer to waste generated in the fishery industry.

  Moreover, the combustible material corresponds to a combustible material formed of combustible waste such as paper waste, wood waste, or plastic waste. Paper waste includes used paper such as used paper, newspaper and books, and wood waste includes wood scrap, thinned wood, bark, and building waste. As plastic waste, synthetic resin waste is widely applicable. However, in order to prevent generation of dioxins, it is preferable to use synthetic resin waste containing no chlorine. All wastes are crushed by a crusher to be crushed pieces having a size of 5 to 20 mm, and then kneaded and molded with aquatic wastes that have been subjected to a dry fermentation process by a reduced-pressure fermentation dryer by a molding device. . Moreover, you may reduce the water | moisture-content ratio of the marine waste in which dry fermentation processing is made | formed by throwing into a reduced pressure fermentation drying apparatus the sawdust which crushes a wood type combustible waste to 5 mm or less.

  In one embodiment of the aquatic waste recycling plant, the heavy metal removing device is a contact device that makes the adsorbed liquid contact at least one of gas or liquid from the reduced-pressure fermentation dryer and dust or gas from the molding device. And an aggregating device for aggregating and removing heavy metals contained in the adsorbing liquid discharged from the contact device.

  According to the above embodiment, at least one of the gas or liquid from the reduced-pressure fermentation drying apparatus and the dust or gas from the molding apparatus is contacted and adsorbed by the contact device, and the aggregation device Heavy metals contained in the adsorbed liquid discharged from the contact device are aggregated and removed. Thereby, the heavy metal which isolate | separates from marine waste in the manufacture process of solid fuel can be removed effectively.

  Here, as the contact device, in the flow of the adsorbed liquid, at least one of the gas or liquid from the reduced-pressure fermentation drying apparatus and the dust or gas from the molding apparatus is released and brought into contact with the adsorbed liquid. A scrubber configured to adsorb gas or liquid to the adsorbing liquid can be used. In addition, as the aggregating apparatus, a precipitation tank to which the adsorbing liquid is guided, a flocculant supplying unit that supplies the flocculant to the adsorbing liquid guided to the precipitation tank, a stirring blade that stirs the adsorbing liquid and the flocculant, and It can comprise by what has. Further, the heavy metal removing device may include a separation device for separating the aggregates aggregated by the aggregation device by centrifugation or the like.

A marine waste recycling plant according to an embodiment includes a heat source device having a combustion furnace for burning the solid fuel,
The heavy metal removing device removes heavy metals from the combustion gas discharged from the combustion furnace of the heat source device.

  According to the embodiment, the heat generated by burning the solid fuel in the combustion furnace of the heat source device can be used for various applications. Moreover, since the heavy metal contained in the combustion gas discharged from the combustion furnace of the heat source device is recovered by the heavy metal removing device, it is possible to prevent the heavy metal from leaking to the surrounding environment. As a result, heavy metals derived from marine waste can be effectively removed not only in the production process of solid fuel but also in the combustion process of solid fuel.

A recycling plant for marine waste according to one embodiment includes a cleaning device for cleaning a combustion residue of solid fuel combusted in a combustion furnace of the heat source device,
A second heavy metal removing device that removes heavy metals contained in the cleaning liquid in which the incineration residue is washed by the washing device.

  According to the above embodiment, the solid fuel formed using the marine waste is burned in the combustion furnace of the heat source device, and the combustion residue of the solid fuel is washed by the washing device. The heavy metal contained in the cleaning liquid that has cleaned the incineration residue by the cleaning device is removed by the second heavy metal removing device. As a result, the heavy metal contained in the solid fuel formed using the marine waste can be effectively recovered, and the inconvenience that the heavy metal leaks to the surrounding environment can be effectively prevented.

The recycling plant for marine waste according to one embodiment, the reduced-pressure fermentation drying apparatus is:
A processing chamber in which the inside is depressurized and the object to be processed is accommodated with the enzyme added; and
A rotating shaft disposed in the processing chamber and supplied with a heat medium therein, a coiled tube connected to the rotating shaft so as to be rotatable in the processing chamber and supplied with a heat medium, and the coil shape A heating and stirring unit having a blade disposed on the outer peripheral side of the tubular body;
And a jacket formed on the wall surface of the processing chamber and supplied with a heat medium.

  According to the above-described embodiment, the aquatic waste as an object to be treated which is added to the enzyme and accommodated in the processing chamber is in contact with the rotating heating stirring unit, while the coiled tube and the blade of the heating stirring unit Stir in The object to be processed is heated by receiving heat from a heating medium supplied to the inside of the rotating shaft and the coiled tube from the rotating shaft and the coiled tube of the heating and stirring unit in contact. The rotating shaft of the heating and stirring unit and the coiled tube have a large contact area with the object to be processed, so the heat of the heat medium supplied to the inside can be efficiently transferred to the object to be processed, and the object to be processed can be quickly Can be dried. Further, the object to be processed can be efficiently dried by the heat of the heat medium supplied to the jacket formed on the wall surface of the processing chamber. In this way, the to-be-processed object formed with the marine waste with comparatively much moisture content can be efficiently dried with a reduced pressure fermentation drying apparatus.

  In addition, since the inside of the processing chamber is depressurized, the boiling point of the water contained in the object to be processed falls below 100 ° C., so that the heating temperature of the object to be processed by the heating stirrer and the jacket can be lowered to kill the enzyme bacteria. Can be prevented. Therefore, decomposition of the workpiece can be promoted, and separation of heavy metals from the workpiece can be promoted.

The recycling plant for marine waste according to one embodiment, the reduced-pressure fermentation drying apparatus is:
A processing chamber in which the inside is depressurized and the object to be processed is accommodated with the enzyme added;
A rotating shaft disposed in the processing chamber and supplied with a heat medium therein, a coiled tube connected to the rotating shaft so as to be rotatable in the processing chamber and supplied with a heat medium, and the coil shape A heating and stirring unit having a blade disposed on the outer peripheral side of the tubular body;
A jacket formed on the wall of the processing chamber and supplied with a heat medium;
A condensing unit that is provided in the processing chamber and cools and condenses the vapor from the object to be processed;
A suction pump for sucking the air in the processing chamber together with the condensed water condensed in the condensing unit;
A cooling deodorizing device is provided that cools the cooling water circulating between the condensing unit to which the enzyme is added and brings the air in the processing chamber sucked by the suction pump and the condensed water into contact with the cooling water,
The cooling deodorization apparatus of the said reduced-pressure fermentation drying apparatus serves as the contact apparatus of the said heavy metal removal apparatus.

  According to the above-described embodiment, the aquatic waste as an object to be treated which is added to the enzyme and accommodated in the processing chamber is in contact with the rotating heating stirring unit, while the coiled tube and the blade of the heating stirring unit Stir in The object to be processed is heated by receiving heat from a heating medium supplied to the inside of the rotating shaft and the coiled tube from the rotating shaft and the coiled tube of the heating and stirring unit in contact. The rotating shaft of the heating and stirring unit and the coiled tube have a large contact area with the object to be processed, so the heat of the heat medium supplied to the inside can be efficiently transferred to the object to be processed, and the object to be processed can be quickly Can be dried. Further, the object to be processed can be efficiently dried by the heat of the heat medium supplied to the jacket formed on the wall surface of the processing chamber. In this way, the to-be-processed object formed with the marine waste with comparatively much moisture content can be efficiently dried with a reduced pressure fermentation drying apparatus.

  Further, the vapor from the object to be dried in the processing chamber is cooled and condensed in the condensing unit, and the condensed water is sucked together with the air in the processing chamber by a suction pump. The air and condensed water in the processing chamber sucked by the suction pump is guided to the cooling deodorization device, and the cooling water circulating between the cooling and dehydrating device and the condensing unit is brought into contact with the cooling water and adsorbed. Is done. By adding an enzyme that decomposes odor to the cooling water flowing through the cooling deodorization apparatus, the odor adsorbed by the cooling water can be decomposed and removed using the object to be treated as a generation source.

  Here, since the cooling and deodorizing device also serves as a contact device for the heavy metal removing device, in addition to deodorizing the air and condensed water in the processing chamber, a gas or liquid generated along with the dry fermentation treatment of marine waste by the reduced-pressure fermentation drying device And a cooling deodorizing apparatus can be utilized in order to remove heavy metal from at least one of the dust or gas discharged | emitted from the said shaping | molding apparatus. Therefore, it is possible to remove odors and heavy metals that are produced during the production process of solid fuel from marine waste with a relatively simple device.

  The marine waste recycling plant of one embodiment heats the heat medium with the combustion heat of the solid fuel.

  According to the above-described embodiment, the combustion heat obtained by burning the solid fuel produced using the marine waste is supplied to the heating and stirring unit and the jacket of the reduced-pressure fermentation drying apparatus to dry the object to be processed. Since the heat medium is heated, the fuel cost can be reduced and the generation of greenhouse gases can be prevented as compared with the case where the heat medium is heated with the heat generated by the fossil fuel.

  In the marine waste recycling plant according to one embodiment, the heat source device is a boiler heat source device for a fishery industry.

  According to the above embodiment, solid fuel is prepared using marine waste that has been disposed of in the past, and this solid fuel is used for a heat source device of a boiler for a fishery industry. It is possible to reduce waste disposal costs and fuel costs.

  In a marine waste recycling plant according to an embodiment, the combustible material includes a crushed piece in which at least one of a waste fishnet and a waste float as flammable waste is crushed.

  According to the above embodiment, as combustible waste, at least one of a waste fish net and a waste float generally formed of a synthetic resin is used, and at least one of the waste fish net and the waste float is crushed. By using a combustible material containing, a solid fuel having a relatively large calorific value can be produced. Further, by reusing the waste fish net or the waste float as a flammable material, it is possible to reduce the labor and cost of disposal of the waste fish net or the waste float. That is, resources can be recycled within the fishery industry, and waste disposal costs can be reduced and fuel costs can be reduced.

  Here, the waste fish net can be made of polyethylene, polyamide or polyester, and the waste float can be made of polystyrene or polyethylene.

The recycling plant for marine waste according to one embodiment includes a combustible material forming line for forming a combustible material to be input to the molding apparatus,
This combustible material forming line is
A fish net crusher for crushing the salted waste fish net,
A wind power sorter that removes metal components from the crushed waste fishnet;
A dry washing and dewatering machine for washing and dewatering the separated waste fish net fragments.

  According to the said embodiment, the combustible material which can be utilized for manufacture of a solid fuel can be formed by the combustible material formation line using the waste fishnet conventionally discarded. For example, salted waste fish nets are crushed with a fish net crusher, metal members such as weights mixed in the waste fish nets are removed with a wind sorter, and the separated waste fish net fragments are separated with a dry washing dehydrator. By washing and dewatering with a small amount of water, a combustible material with little incombustible residue after incineration can be efficiently formed from the waste fish net. Moreover, a high calorie solid fuel can be manufactured by using a waste fish net as a combustible material.

  Here, the dry cleaning dehydrator has a plurality of feed blades attached to a rotating shaft and a permeation net disposed outside the feed vane, and fragments of waste fish nets along with a small amount of water inside the permeation net. The crushed pieces are agitated and washed by the action of the rotating feed blades, and the centrifugal force acting on the crushed pieces from the feed blades discharges water and dirt to the outside of the permeation net so that they are washed with a small amount of water. What was comprised in can be used.

  In one embodiment of the aquatic waste recycling plant, the aquatic waste includes at least one of shellfish internal organs, squid internal organs, jellyfish, starfish, and seaweed temporary roots.

  According to the above-described embodiment, solid fuel is contained while recovering heavy metals and preventing leakage to the surrounding environment by using marine waste that contains a lot of heavy metals and has been conventionally dumped or incinerated. Can be manufactured.

  In one embodiment of the marine waste recycling plant, the molding device is a screw-type molding device, a ring-die-type molding device, or a flat-die-type molding device.

  According to the embodiment, by using a screw type molding machine, a ring die type molding machine, or a flat die type molding machine, solid fuel can be efficiently produced from marine waste and combustible materials. Can do.

It is a block diagram which shows the recycling plant of the fishery waste of embodiment. It is a schematic diagram which shows a reduced pressure fermentation drying apparatus. It is a block diagram which shows a combustible material formation line. It is a schematic diagram which shows the principal part of a wind power sorter. It is a schematic diagram which shows a washing | cleaning dehydration apparatus and a wind power sorter. It is sectional drawing which shows a part of shaping | molding apparatus. It is a schematic diagram which shows the principal part of a ring die type shaping | molding apparatus. It is a schematic diagram which shows a heavy metal removal apparatus.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a marine waste recycling plant of the present invention will be described in detail with reference to the accompanying drawings.

  The marine waste recycling plant according to the present embodiment is for producing solid fuel by processing scallop uro (midgut gland) as marine waste, and FIG. 1 shows the main configuration of the recycling plant. It is a block diagram.

  The recycling plant P of the present embodiment includes a reduced-pressure fermentation drying apparatus 1 that processes uro, and a molding apparatus 2 that produces solid fuel using the urine and the flammable material processed by the reduced-pressure fermentation drying apparatus 1. Part of the solid fuel formed by the molding device 2 is guided to the heat source device 5, and the solid fuel is burned by the heat source device 5 to generate heat for heating the heat medium of the reduced-pressure fermentation drying device 1, and also for fisheries It is comprised so that the heat | fever which heats the water of the boiler 8 which produces | generates the steam used in a processing factory etc. may be produced | generated. This recycling plant P is a contact device that brings condensed water and gas discharged from the reduced-pressure fermentation drying apparatus 1, dust and gas discharged from the molding apparatus 2, and gas discharged from the heat source apparatus 5 into contact with adsorbed water. 3 is provided. In addition, the recycling plant P includes a cleaning device 6 that cleans ash generated by burning solid fuel in the heat source device 5. Further, the recycling plant P includes an aggregating device 4 that processes the adsorbed water from the contact device 3 and the cleaning water from the cleaning device 6 to precipitate and aggregate heavy metals. In addition, the recycling plant P includes a combustible material production line 7 that forms a combustible material from a waste fish net as combustible waste.

  FIG. 2 is a schematic diagram showing the reduced-pressure fermentation drying apparatus 1. The reduced-pressure fermentation drying apparatus 1 is for drying and fermenting uro, which is an object to be processed, under a reduced-pressure environment to form a solid fuel material. This reduced-pressure fermentation drying apparatus 1 accommodates an object to be treated together with an enzyme, a cylindrical casing 11 that performs reduced-pressure drying while maintaining the internal pressure at atmospheric pressure or lower, and a heater jacket 12 provided at the lower portion of the casing 11. And a condensing section 13 provided on the casing 11 for condensing water vapor evaporated from the residue, and a coil-type stirring member 14 disposed in the casing 11.

  The coil-type stirring member 14 includes a rotating shaft 14a, a stirring coil 14b, and a scraping plate 14c that is disposed on the outer peripheral side of the stirring coil 14b and scrapes off deposits on the inner peripheral surface of the casing 11. Inside the rotary shaft 14a and the stirring coil 14b, steam as a heat medium supplied from the heat source device 5 is formed to flow. Further, steam heated by the heat generated by the heat source device 5 is supplied to the heater jacket 12 so that the workpiece is heated from the wall surface side of the casing 11.

  The reduced-pressure fermentation drying apparatus 1 feeds an object to be processed, which is input from an input port 11a on one end side of the upper part of the casing 11, to the other end side while stirring with a coil-type stirring member 14, and also uses a coil-type stirring member. 14 and heated by the heat of steam supplied to the heater jacket 12 and dried. Here, the inside of the casing 11 is sucked indoor air by the vacuum pump VP and kept below atmospheric pressure, thereby lowering the boiling point of water and drying the object to be processed at a relatively low heating temperature. For example, when the pressure inside the casing 11 is reduced by 0.03 MPa below atmospheric pressure, the boiling point of water drops to about 90 ° C., and when the pressure inside the casing 11 is reduced by 0.07 MPa below atmospheric pressure, the boiling point of water becomes about 68 ° C. To descend. Steam having a temperature corresponding to the atmospheric pressure in the casing 11 is supplied to the heater jacket 12 and the coil-type stirring member 14.

  The condensing unit 13 includes a cooling pipe through which cooling water circulates and deposits condensed water on the surface, a water receiving bowl that receives condensed water dripped from the cooling pipe, and a suction port that sucks the condensed water in the water receiving bowl. Have. The condensed water generated in the condensing unit 13 is sucked together with the air in the casing 11 by the vacuum pump VP, and is sent to the contact device 3 functioning as a cooling deodorization device as indicated by an arrow V. A cooling water circulation flow is formed between the contact device 3 and the condensing unit 13 by the cooling water pump P. A deodorizing enzyme is added to the cooling water, and the odor contained in the indoor air and condensed water adsorbed by the cooling water is decomposed by the action of the deodorizing enzyme to perform deodorization. Further, as will be described in detail later, heavy metals contained in room air and condensed water are adsorbed by the contact device 3 to the cooling water.

  As the enzyme added to the object to be processed in the casing 11 and the enzyme added to the cooling water of the contact device 3, at least one of the following can be used. By adding a microorganism having at least one of the following enzymes, the microorganism corresponding to the organic substance present in the object to be processed and the cooling water is activated, and the organic substance in the object to be processed and the cooling water is decomposed. The substance on which each enzyme acts is described in parentheses following each enzyme name. Alcohol dehydrogenase (alcohol), lactate dehydrogenase (lactose), glucose 6-phosphate dehydrogenase (carbohydrate), aldehyde dehydrogenase (aldehyde), L, aspartate, beta-semialdehyde, NADP Oxdrectase (aldehyde), glutamate dehydrogenase (amino acid), aspartate semialdehyde dehydrogenase (amino acid), NADPH2 cyclochrome C-reactase (NADP), glutathione dehydrogenase (glutathione), Trehalose phosphate synthetase (carbohydrate), polyphosphae kinase (ATP), ethanolamine phosphae cytidyltransferase (CTP), trehalose phosphatase (carbohydrate), metal O-phospho-glycerate phosphatase (glycerin), inulase (inulin), β-mannositase (carbohydrate), uridine nucleositase (amino acid), cytosine diaminase (cytosine), methylcysteine synthetase (amino acid), aspartate synthetase (ATP) ), Succinate dehydrogenase (succinic acid), aconitic acid hydrogenase (citrate), fumarate hydrogenase (malonic acid), maleate dehydrogenase (malonic acid), citrate synthetase (acetyl CouA) , Isocitrate dehydrogenase (citrate), LSNADP oxidase (citrate), monoamine oxidase (amine), histamine (amine), pyruvate decarboxylase (oxoacid), ATPase (ATP), nucleotide pyrophosphatase (nucleic acid), endopolyphosphatase (ATP), ATP phosphohydrolase (ATP), orotidine 5-phosphate decarboxylase (orotidine). By the action of these enzymes, the organic matter contained in the object to be treated and the cooling water is decomposed, and the odor caused by uro can be reduced.

  In addition, uro of the object to be processed in the casing 11 is decomposed by the action of a predetermined enzyme, so that heavy metals such as cadmium are dissociated from the uro. Here, by adding a flocculant into the casing 11, the heavy metal dissociated from the uro may be agglomerated to prevent diffusion of the heavy metal. By using a sulfur-containing material such as sodium sulfide as the flocculant, an insoluble heavy metal sulfide can be generated and aggregated. Moreover, after dissociating heavy metal from uro, the inside of the casing 11 may be an anaerobic environment, and the sulfur-reducing bacteria may be activated to generate sulfide to form heavy metal sulfide.

  When processing the urine having a water content of 80 wt% with the reduced-pressure fermentation drying apparatus 1, the reduced pressure value from the atmospheric pressure is 0.03 to 0.07 MPa, and the temperature of the heat medium is 60 to 80 ° C. It is preferable to perform an enzyme operation that stirs for 3 hours and promotes the activity of the enzyme. Subsequently, a drying operation is performed to stir for 30 minutes to 1 hour under the condition that the pressure reduction from the atmospheric pressure is 0.05 to 0.09 MPa and the temperature of the heat medium is 80 to 120 ° C., and to promote evaporation of water vapor. Is preferred. By performing such an enzyme operation and a drying operation, a powdery fermented and dried uro having a moisture content of about 20% or less by mass and almost no odor can be obtained.

  The fermented and dried urine obtained by fermenting and drying the urine in the reduced-pressure fermentation and drying apparatus 1 is discharged from the discharge port 11b on the other end side of the lower portion of the casing 11, and is not shown for maintaining the low pressure in the reduced-pressure dryer 1. Via the rotary valve, it is sent to a metering feeder formed integrally with the storage silo. A predetermined amount of the fermented and dried urine is unwound from a fixed quantity feeder as a solid fuel material and is supplied to the molding apparatus 2.

  FIG. 3 is a block diagram showing the combustible material forming line 7. The combustible material formation line 7 is a line for processing a waste fish net generated in the fishery industry as combustible waste to form a waste fish net chip as a combustible material to produce a solid fuel material.

  As shown in FIG. 3, the combustible material forming line 7 includes a water washing device 71, a crushing device 72, a first wind sorting device 73, a dry cleaning and dehydrating device 74, and a second wind sorting device 75. Has been.

  The combustible material forming line 7 is filled with waste fish nets which are plastic waste and are formed of a synthetic resin such as polyethylene. The waste fish net is first washed with water by a water washing device 71 to remove sea salt. The water washing apparatus 71 includes a cylindrical water tank and a stirring blade installed so that the rotation axis coincides with the central axis of the water tank, and is a wet type for stirring the waste fish net introduced into the water tank in the water by the stirring blade. A water washing apparatus can be used. By washing the waste fish net with the water washing device 71 to remove the sea salt, it is possible to prevent the disadvantage that dioxins are generated when the solid fuel burns.

  The waste fish net washed with the water washing device 71 is put into the crushing device 72 and crushed. As the crushing device 72, a uniaxial crusher in which one rotating shaft having a rotating blade is driven to rotate in the vicinity of a fixed blade fixed to the device main body can be used. The crushing device 72 has a hydraulic pusher that presses the input waste fish net toward the rotation axis. By this crushing device 72, the waste fish net pressed by the pusher toward the rotating shaft is crushed by the shearing action of the fixed blade and the rotating blade to form a crushed piece having a size of 5 to 20 mm.

  Waste fish net fragments formed by the crushing device 72 are guided to the first wind power sorting device 73 to separate and remove heavy objects such as weights and metal wires. As shown in FIG. 4, the first wind power sorter 73 uses the zigzag pipe for the crushed material continuously supplied as indicated by the arrow B to the supply port 731 a at the bottom of the bowl-shaped zigzag pipe line 731. The light is sorted into light and heavy by the upward air flow formed in the path 731. The lightweight object is conveyed to the cyclone separator 732 from the upper end of the zigzag pipe line 731 by the air flow, and is separated from the air flow by the cyclone separator 732. The air from which the lightweight material is separated by the cyclone separator 732 is sucked by the blower 733 and then pumped and returned to the air supply port 731b at the lower part of the zigzag pipe line 731 to form an upward air flow in the zigzag pipe line 731. To do. Lightweight items mainly composed of combustibles such as resin parts of waste fishnets are discharged from the lower end of the cyclone separator 732 through a rotary seal valve as indicated by an arrow BL, and are quantified (not shown) formed integrally with the storage silo. Stored in the feeder. The weight mainly composed of incombustible material such as a weight is discharged as indicated by an arrow BH, and is subjected to disposal or other regeneration processing.

  The lightweight object from which the heavy object has been removed is cleaned by the dry cleaning and dehydrating device 74. As schematically shown in FIG. 5, the dry cleaning dehydrator 74 has an inlet 741a at one end of the casing 741, and a lightweight object is introduced into the inlet 741a together with water and air as indicated by an arrow P. Is done. Deodorizers such as ozone and deodorizing enzymes can be added to water. In the casing 741, a plurality of paddles 743 that are attached to the rotating shaft 742 and are driven to rotate so as to feed a lightweight object are arranged. In addition, a cylindrical transmission body 744 is disposed in the casing 741 so as to surround the paddle 743. Note that the transmission body 744 may not be cylindrical, and the shape is not limited as long as the transmission body 744 covers a part of the rotation locus drawn by the tip of the paddle 743. Further, the transmission body 744 may be formed of a net-like material, or may be formed of a slit-like material. As the lightweight object is fed by the paddle 743 toward the other end of the transmission body 744, the dirt is removed together with moisture and washed and dried. The dirt removed together with the water from the lightweight object becomes dirty water and is discharged to the outside of the transmission body 744 and collected at the lower part of the casing 741. The sewage is discharged out of the casing 741 and discarded by the discharge conveyor 745 disposed at the lower portion of the casing 741 as indicated by an arrow D. As described above, the dry cleaning and dehydrating machine 74 can clean and dehydrate lightweight objects by the rotational force of the paddle 743 without heating. Therefore, a combustible material can be obtained with relatively little energy consumption by an apparatus having a relatively simple configuration.

  The lightweight material that has been washed and dried by the dry cleaning and dehydrating device 74 is discharged from a discharge port 741b formed at the other end of the casing 741 by a take-out conveyor 746 connected to the discharge port 741b. As shown in FIG. 5, a second wind sorting device 75 is connected to the end of the takeout conveyor 746.

  As shown in FIG. 5, the second wind power sorter 75 includes a vertical pipe 751 that is connected to the terminal end of the take-out conveyor 746 and extends linearly up and down, and below the connection position of the vertical pipe 751 with the take-out conveyor 746. In addition, an air supply pipe 751a for supplying air from the blower 753 is connected. The light supplied from the take-out conveyor 746 is conveyed upward in the vertical pipe 751 by the air supplied through the air supply pipe 751a and flowing in the vertical pipe 751 from the bottom to the top. The lightweight object conveyed by the air flow is guided from the upper end 751b of the vertical pipe to the cyclone separator 752 as indicated by the arrow PL, and separated from the air flow by the cyclone separator 752, and is integrated with a storage silo (not shown) as a combustible material. It is stored in a metering feeder formed in the above. The air flow from which the lightweight material is separated by the cyclone separator 752 is sucked into the blower 753. On the other hand, the heavy object discharged from the take-out conveyor 746 and mixed in the light object falls in the vertical pipe 751 against the air flow and is discharged from the lower end 751c of the vertical pipe as indicated by an arrow PH. .

  In this way, the combustible material forming line 7 forms the combustible material that is the material of the solid fuel from the waste fish net that is the combustible waste.

  The combustible material forming line 7 may be used to create a combustible material using, for example, a waste float formed of polystyrene as combustible waste. In this way, by creating flammable materials from combustible waste such as waste fishnets and waste float discharged in the fishery industry, and using them as solid fuel materials, waste discharged in the fishery industry can be efficiently Can be reused. As combustible waste, in addition to waste fishnets and waste floats discharged in the fishery industry, plastic waste or paper waste discharged in general households and other industries may be used. As plastic waste, synthetic resin waste is widely applicable, and in order to prevent generation of dioxins, it is preferable to use synthetic resin waste not containing chlorine. Further, as paper waste, used paper such as used office paper, newspaper, and books are applicable. Furthermore, woody waste discharged in agriculture, forestry and construction industry may be used as combustible waste. Woody waste includes timber scrap, thinned wood, bark, and building waste. Any waste is crushed with a crusher to form crushed pieces having a size of 5 to 20 mm, and then charged into the molding apparatus 2 and kneaded and molded with fermented and dried uro. Moreover, you may reduce the water | moisture content of the urine by throwing into the reduced-pressure fermentation drying apparatus 1 the sawdust which crushes a wood type combustible waste to 5 mm or less.

  FIG. 6 is a cross-sectional view schematically showing a part of the molding apparatus 2 used in the recycling plant P of the present embodiment. The molding apparatus 2 is a screw-type molding apparatus that includes a pair of screw blades 22 and 22 having rotational axes arranged substantially in parallel. The screw-type molding apparatus 2 performs kneading, compression and molding of a material while preventing a back flow of the material by a pair of screw blades 22 and 22, and friction generated with the compression and kneading of the material. It is configured to perform heating, compression and molding with high efficiency using heat.

  The molding apparatus 2 accommodates a pair of screw blades 22 and 22 for kneading and compressing a material in a casing 21 having an input port for an object to be processed at the top. A charging port cover 28 having a charging port 28 a and an exhaust pipe 28 b is installed at the charging port of the casing 21. As shown by the arrow M through the inlet 28a of the inlet cover 28, the material is introduced into the casing 21, and the dust and gas generated when the material is kneaded, compressed and molded by the screw blades 22 and 22 are exhausted from the exhaust pipe 28b. Is discharged as shown by arrow G1. Dust and gas discharged from the exhaust pipe 28b are sent to the contact device 3 described later.

  An end face plate 23 is attached to the end face of the casing 21 on the front end side of the pair of screw blades 22, 22. A plurality of forming nozzles 24 are attached to the end face plate 23 for discharging the compressed material into a rod having a circular cross section. A discharge port cover 29 having a fuel discharge port 29a and an exhaust pipe 29b is attached to the outer surface of the end face plate 23 so as to surround the outlet of the forming nozzle 24. The discharge port cover 29 discharges the solid fuel pushed out from the molding nozzle 24 from the fuel discharge port 29a, and discharges dust and gas discharged from the molding nozzle 24 mixed with the solid fuel from the exhaust pipe 29b. ing. Dust and gas discharged from the exhaust pipe 29b are sent to the contact device 3 described later.

  The screw blades 22, 22 accommodated in the casing 21 are attached to the distal ends of a pair of rotating shafts 25, 25 installed by being inserted from the outside to the inside of the casing 21 on the base end side of the screw blades 22, 22. ing. Attachment portions 25a and 25a having a hexagonal cross section are formed at the tips of the rotary shafts 25 and 25, and screw blades 22 and 22 are fitted to the outer peripheral sides of the attachment portions 25a and 25a.

  The screw blade 22 has a shaft portion attached to the attachment portion 25a of the rotating shaft 25 and a spiral blade portion formed on the peripheral surface of the shaft portion. The pair of screw blades 22, 22 attached to the pair of rotating shafts 25, 25 are formed so that the spiral blade portions are formed in opposite directions, and the spiral blade portions overlap each other when viewed from the extending direction of the shaft portion. Has been. The pair of rotary shafts 25 and 25 are rotationally driven in directions opposite to each other, whereby the material put into the casing 21 is sandwiched by the pair of screw blades 22 and 22 and transferred to the end face plate 23 side while being kneaded and compressed. It is formed to do.

  A cutting machine (not shown) for cutting the rod-shaped material discharged from the forming nozzle 24 of the end face plate 23 is attached to the end face of the casing. This cutting machine includes a rotary blade that is rotatably arranged at the outlet of the molding nozzle 24 and a motor that drives the rotary blade.

  The pair of screw blades 22, 22 are formed of a first spiral shaft 221, a second spiral shaft 222, and a third spiral shaft 223 in order from the inlet side in the casing 21 toward the end face plate 23 side. Has been. Each spiral shaft 221, 222, 223 is formed of a shaft portion connected to the rotation shaft 25 and a spiral blade portion fixed to the outer peripheral surface of the shaft portion. The first spiral shaft 221, the second spiral shaft 222, and the third spiral shaft 223 are formed such that the diameter of the shaft portion is increased in this order and the pitch of the spiral blade portion is decreased in this order. Yes. Furthermore, the thickness of the spiral blade portion is increased in this order. As a result, the volume of the processing chamber formed between the surface of each helical shaft and the inner surface of the casing 21 is set to the first helical shaft 221, the second helical shaft 222, and the third helical shaft 223. In order to make it smaller. As a result, the first spiral shaft 221, the second spiral shaft 222, and the third spiral shaft 223 reliably transfer the material to the subsequent stage without causing any inconvenience such as biting, and sequentially apply a large compressive force to the material. be able to. The screw blade 22 compresses a material having a bulk specific gravity of 0.025 at the time of charging so that the bulk specific gravity is approximately between 0.45 and 0.5 when discharged from the molding nozzle 24 of the end face plate. it can. Further, a material having a bulk specific gravity of 0.025 at the time of charging can be compressed so that the true specific gravity is approximately between 0.8 and 1 when discharged from the molding nozzle 24.

  The third spiral shaft 223 has a flat portion at the tip of the spiral blade portion, and the flat portion is disposed close to the inner surface of the end face plate 23 so that the third spiral shaft 223 is rotationally driven, so that the third spiral shaft 223 is compressed at a high density. The formed material is surely extruded from the forming nozzle 24 of the end face plate 23. The third helical shaft 223 gives the material the maximum compressive force among the compressive forces given by the helical shafts 221, 222, 223, and therefore, a base portion formed of chromium steel and a tungsten carbide-based material, for example, on the surface of the base portion And a built-up portion formed using a wear-resistant material such as.

  In the casing 21, a plurality of lining blocks 27, 27,... Surrounding the second and third spiral shafts 222, 223 are arranged. A material processing chamber is formed between the plurality of lining blocks 27 and the outer surfaces of the second and third spiral shafts 222 and 223.

  The end face plate 23 is provided with a plurality of through holes in a region through which the flat portion at the tip of the third spiral shaft passes and a molding nozzle 24 is inserted into the through hole. The end face plate 23 incorporates a resistance heating type heater, and heats the material discharged through the molding nozzle 24 to maintain flexibility.

  The molding apparatus 2 produces a solid fuel as follows.

  First, after supplying electric power to the heater of the end face plate 23 and preheating the end face plate 23, a motor (not shown) is started to rotate the pair of rotating shafts 25 and 25 in the opposite directions, and a pair of screw blades. 22 and 22 are rotated in opposite directions. The rotational speed of the screw blade 22 is preferably rotated at a relatively low speed of, for example, 30 rpm or more and 60 rpm or less. Subsequently, the fermented and dried urine subjected to the fermentative drying process in the reduced-pressure fermentative drying apparatus 1 and the combustible material are charged into the inlet of the casing 21.

  In the casing 21, the charged material is sandwiched and kneaded by the pair of first spiral shafts 221, and reliably transferred to the second spiral shaft 222 side by a powerful sandwiching force. The second helical shaft 222 guides the material into the processing chamber formed between the second helical shaft 222 and the lining block 27, and kneads and compresses the material. The material introduced into the processing chamber is kneaded and compressed while being fed to the end face plate 23 side by the rotation of the second helical shaft 222, thereby effectively preventing the back flow of the material. Subsequently, the third spiral shaft 223 guides the material into the processing chamber formed between the third spiral shaft 223 and the lining block 27 and performs further kneading and compression. The first, second, and third spiral shafts 221, 222, and 223 are formed such that the diameter of the shaft portion is increased in this order, the pitch of the spiral blade portion is increased, and the thickness of the spiral blade portion is increased. Therefore, the material can be effectively kneaded and compressed without inconvenience such as biting of the material and a decrease in density.

  The first, second and third helical shafts 221, 222, and 223 effectively produce compressive heat and frictional heat in the material by sequentially applying a large compressive force to the material and performing kneading. It is possible to effectively melt a melt such as a synthetic resin contained in the combustible material. Thus, since the melt can be sufficiently melted by the compression heat or frictional heat of the material, the melt in the material can be sufficiently melted only by auxiliary heating with the heater of the end face plate 23.

  The material guided to the third spiral shaft 223 and compressed at a high pressure is extruded in a rod shape from the forming nozzle 24 of the end face plate 23 in a state where the melt is melted. The extruded rod-shaped material is cut into a predetermined length by a cutting machine, and as the temperature falls, the melt is solidified to obtain a solid fuel.

  FIG. 7 is a view showing a main part of a ring die type molding apparatus 102 as another example of the molding apparatus. This molding device 102 is a so-called pellet mill, which extrudes material from the inside of a rotating cylinder 120 that is rotationally driven through a die hole 120a provided in a body portion, thereby producing pellet-shaped solid fuel. To manufacture.

  The ring die type molding apparatus 102 includes a rotating cylindrical body 120 provided with a die hole 120a, and two rolling wheels 121 and 121 having an outer surface disposed close to the inner side surface of the rotating cylindrical body. The two rolling wheels 121 are arranged at opposing positions on the diameter of the rotating cylindrical body 120, and a number of axial grooves are formed on the surface of the rolling wheel 121 to reduce material slip and facilitate uptake. Yes. In a state where the rotating cylindrical body 120 and the rolling wheels 121 and 121 are rotationally driven in directions indicated by arrows R1 and R2, respectively, fermented and dried scale and combustible material are charged into the rotating cylindrical body 120. The charged material is sandwiched between the inner side surface of the rotating cylindrical body 120 and the outer side surface of the rolling wheel 121 and compressed, and is pushed out from the die hole 120 a in the body portion of the rotating cylindrical body 120. The extruded material is cut to a predetermined length by the fixed blades 122 and 122 arranged to face the body portion of the rotating cylindrical body 120, and a pellet-shaped solid fuel is obtained. The ring die type molding apparatus 102 is suitable for producing a comparatively small solid fuel having a diameter of up to about 10 mm, and when the amount of moisture in the material before molding is small and heating of the material is unnecessary. Is preferred.

  As the molding device of the present invention, the screw type molding device 2 and the ring die type molding device 102 as described above can be used, but other types of molding devices such as a flat die type molding device are used. You can also. Here, as a flat die type molding apparatus, a planar flat die having a plurality of die holes formed in an annular region and having a revolution axis at the center of the annular region formed with the die hole, and the revolution axis It is possible to use a roller provided with a roller whose outer peripheral surface is revolved in a sliding state with respect to the surface of the flat die and pushes the material supplied between the surface of the flat die and the die hole.

  As described above, the solid fuel produced by the molding apparatuses 2 and 102 is cooled by a cooler (not shown) and stored in a storage silo. Part of the solid fuel stored in the storage silo is used as the fuel of the heat source device 5. Other part of the solid fuel is sold as fuel for various uses such as boilers and heating.

  The heat source device 5 burns solid fuel produced using scales and waste fish nets, and generates heat used in the reduced-pressure fermentation drying device 1 and the boiler 8. The heat source device 5 includes a combustion furnace to which solid fuel is supplied, and a dust collector that collects smoke contained in the exhaust gas from the combustion furnace. A known furnace such as a stoker furnace or a fluidized bed furnace can be applied to the combustion furnace. Moreover, well-known devices, such as a bag filter, a cyclone type dust collector, and an electric dust collector, can be applied to the dust collector. The combustion gas generated in the combustion furnace of the heat source device 5 is passed through the outer periphery of the heat exchange pipe through which the heat medium of the reduced-pressure fermentation dryer 1 passes to heat the heat medium. Moreover, the combustion gas produced | generated with the combustion furnace of the said heat-source apparatus 5 is guide | induced to the water pipe of the boiler 8, and the water in a water pipe is heated. In this way, the solid fuel is produced using the waste generated in the fishery industry, and the solid fuel is burned to be used as a heat source of the vacuum fermentation drying apparatus 1 for producing the solid fuel. Steam to be used is generated by the boiler 8. As a result, in the fishery industry, resources can be efficiently reused, the final disposal amount of waste can be reduced, and the amount of fossil fuel used can be reduced.

  The combustion gas generated in the heat source device 5 and heated after heating the heating medium and the boiler 8 in the reduced-pressure fermentation drying device 1 contains heavy metal derived from uro, so it is led to a heavy metal removing device, which will be described later. Perform removal processing. Moreover, since the heavy residue derived from the urine remains in the combustion residue generated by burning the solid fuel in the combustion furnace of the heat source device 5, it is guided to the cleaning device 6 for cleaning. The cleaning device 6 includes a water tank in which the combustion residue is introduced and cleaning water is supplied, a supply unit that supplies the flocculant into the water tank, and agitation that stirs the cleaning water in which the combustion residue and the flocculant are input in the water tank. What is provided with the means can be used. With this cleaning device 6, the combustion residue is stirred with water by a stirring means and mixed to elute water-soluble components of the combustion residue into water. Thereafter, the insoluble components are aggregated with a coagulant, and then the insoluble components that have been aggregated and precipitated are collected. On the other hand, the water from which the water-soluble components of the combustion residue are eluted is guided to the aggregating device 4 to aggregate the heavy metal components contained in the water Aggregate with apparatus 4. As described above, the cleaning device 6 and the aggregating device 4 function as a second heavy metal removing device. A known polymer flocculant can be used as the flocculant used in the cleaning device 6. Note that a sulfur-containing material such as sodium sulfide may be used as the flocculant. In this case, since heavy metals such as cadmium can be insolubilized, the washing water does not have to be treated by the flocculant 4. In this case, only the cleaning device 6 can function as a second heavy metal removing device. In the cleaning device 6, in addition to the combustion residue generated from the heat source device 5, the dust collected by the dust collector may be cleaned.

  FIG. 8 is a schematic diagram showing a heavy metal removing device that recovers heavy metals from the condensed water and the like discharged from the reduced-pressure fermentation drying apparatus 1 and the molding apparatus 2. The heavy metal removing device includes a contact device 3 and an aggregating device 4, and the contact device 3 also functions as a cooling deodorization device of the reduced-pressure fermentation drying device 1.

  The contact device 3 brings the condensed water and gas guided from the reduced-pressure fermentation drying device 1, the gas guided from the molding device 2, and the gas guided from the heat source device 5 into contact with the adsorbed water. The adsorbed water also functions as cooling water supplied into the cooling pipe of the condensing unit 13 of the reduced-pressure fermentation drying apparatus 1, and functions as cooling water and adsorbed water when returned from the condensing unit 13 to the contact device 3. The contact device 3 includes a casing 31 having an air circulation port at the top and bottom, a water tank 32 installed at the lower end of the casing 31, a water spray pipe 33 for guiding the water in the water tank 32 to the top in the casing 31, The watering pump SP interposed in the water pipe 33, a plurality of watering nozzles 33a, 33a,... Provided at the branched tip of the watering pipe 33, and the contact where the water from the watering nozzle 33a flows down and contacts. A body 35 and a fan 36 provided at the upper end in the casing 31 are provided. The casing 31 includes condensed water and air discharged from the reduced-pressure fermentation drying apparatus 1 as indicated by an arrow V in FIG. 2, and dust and gas discharged from the molding apparatus 2 as indicated by arrows G1 and G2 in FIG. And a contact conduit 34 that guides combustion gas discharged from the heat source device 5 described later. A plurality of discharge nozzles 34a are provided at the branched tip of the contact conduit 34 so that condensed water, gas, and dust guided by the contact conduit 34 are discharged toward the flow of water discharged from the watering nozzle 33a. , 34a,... Are provided. The contact body 35 is provided with a porous filler formed of resin and serves as a carrier for deodorizing enzymes. A water pipe 37 for discharging the adsorbed water in the water tank 32 to the aggregating device 4 is connected to the water tank 32, and a drain pump AP is interposed in the water pipe 37. The water tank 32 is connected to a cooling water pipe 38 that supplies the adsorbed water in the water tank 32 as cooling water to the condensing unit 13 of the reduced-pressure fermentation drying apparatus 1. A cooling water pump P that is circulated between 3 and the condenser 13 is interposed.

  The aggregating device 4 includes a settling tank 41 that stores adsorbed water led from the water tank 32 of the contact device 3 through the water distribution pipe 37, a flocculant supply pipe 42 that supplies the flocculant into the settling tank 41, and a flocculant Is provided with a stirring blade 43 for stirring the adsorbed water to which is added.

  The heavy metal removing device composed of the contact device 3 and the aggregating device 4 operates as follows. First, in the contact device 3, the adsorbed water pumped up from the water tank 32 through the water spray pipe 33 by the water spray pump SP is sprayed toward the contact body 35 from the water spray nozzle 33 a at the top of the contact device 3. Here, condensed water, dust, and gas guided by the contact conduit 34 are discharged from the discharge nozzle 34a disposed below the watering nozzle 33a, and the condensed water is mixed with the adsorbed water, and the adsorbed water has dust and gas. Come into contact and at least a portion is adsorbed. The adsorbed water mixed with the condensed water and adsorbing the dust and gas flows down into the water tank 32 through the contact body 35. Thus, while the adsorbed water circulates and flows through the water tank 32, the water spray pipe 33, the water spray nozzle 33a and the contact body 35, the odor of the adsorbed water is decomposed by the action of the deodorizing enzyme carried on the contact body 35, and the fan 36 is cooled by the air flowing from bottom to top, and the heavy metal contained in the condensed water, dust and gas is held in the adsorbed water. Thus, the contact device 3 exhibits a cooling function of cooling water, a deodorizing function of condensed water, and a heavy metal adsorption function. Note that the contact conduit 34 may be configured such that the distal end portion is located in the water tank 32 and the condensed water, dust, and gas are discharged to the adsorbed water in the water tank 32. A part of the adsorbed water in the water tank 32 is returned to the condensing unit 13 of the reduced pressure fermentation drying apparatus 1 by the cooling water pump P as cooling water. Further, another part of the adsorbed water in the water tank 32 is sent to the aggregating device 4 through the water distribution pipe 37 by the drainage pump AP in order to agglomerate heavy metals.

  In the aggregating device 4, the adsorbed water sent from the water tank 32 of the contact device 3 via the water distribution pipe 37 is stored, and when the adsorbed water reaches a predetermined amount, the drainage pump AP stops. When a predetermined amount of adsorbed water is stored in the settling tank 41, a predetermined amount of the flocculant is discharged from the flocculant supply pipe 42 and added to the adsorbed water in the settling tank 41. As the flocculant, sodium sulfide can be used, but other sulfur-containing materials may be used. After the flocculant is added, the stirring blade 43 rotates to stir the adsorbed water and the flocculant. When the stirring blade 43 starts stirring and a predetermined time elapses, the operation of the stirring blade 43 is stopped and the insoluble matter aggregated by the flocculant is precipitated. The insoluble matter is a heavy metal sulfide such as cadmium sulfide when the flocculant is sodium sulfide. After the stirring by the stirring blade 43 is stopped, when the insoluble matter S containing heavy metal is precipitated at the bottom of the sedimentation tank 41, the water in the sedimentation tank 41 is discharged, and the insoluble matter S is collected by a hopper and stabilized. Final disposal as waste. Since the heavy metal is insolubilized and removed from the water in the precipitation tank 41 discharged from the precipitation tank 41, leakage of the heavy metal can be prevented. Further, since the heavy metal is recovered as an insoluble precipitate S such as sulfide, it can be disposed as a stabilized heavy metal at a final disposal site or the like without causing environmental pollution.

  In this way, the heavy metal contained in the dust and gas generated in the solid fuel production process and the heavy metal contained in the dust, exhaust gas and combustion residue generated in the solid fuel combustion process are absorbed by the adsorption device 3 and the aggregating device 4. Since it is removed, marine waste such as urine can be recycled while preventing leakage and diffusion of heavy metals.

  In the above-described embodiment, the heat source device 5 generates heat by burning solid fuel formed using marine waste, but the fuel of the heat source device 5 may not be solid fuel using marine waste. For example, wood waste such as wood chips and wood chips may be used as fuel. In this case, the exhaust gas from the heat source device 5 may not be processed by the contact device 3. Moreover, all the solid fuel manufactured with the shaping | molding apparatus 2 may be burned with the heat-source apparatus 5, and all the solid fuel may be consumed in a plant.

  Further, in the above embodiment, scallop uros were used as aquatic waste, but other shellfish built-in may be used, and squid internal organs, jellyfish, starfish, seaweed temporary roots, etc. Other wastes may be used.

DESCRIPTION OF SYMBOLS 1 Pressure-reducing fermentation drying apparatus 2 Molding apparatus 3 Contact apparatus 4 Aggregation apparatus 5 Heat source apparatus 6 Cleaning apparatus 7 Flammable material production line 8 Boiler

Claims (9)

A reduced-pressure fermentation drying apparatus for fermenting and drying marine waste in a reduced-pressure environment;
A molding apparatus for producing a solid fuel by mixing and molding a material to be processed by the above-described reduced-pressure fermentation drying apparatus and a combustible material formed from combustible waste;
A heavy metal removing device that removes heavy metal from at least one of a gas or a liquid generated by dry fermentation treatment of marine waste by the reduced-pressure fermentation drying device and dust or gas discharged from the molding device,
The heavy metal removing device is
A contact device for contacting at least one of the gas or liquid from the reduced-pressure fermentation drying apparatus and the dust or gas from the molding apparatus with an adsorbent;
A coagulation device for coagulating and removing heavy metals contained in the adsorbed liquid discharged from the contact device,
The reduced pressure fermentation drying apparatus
A processing chamber in which the inside is depressurized and the object to be processed is accommodated with the enzyme added; and
A rotating shaft disposed in the processing chamber and supplied with a heat medium therein, a coiled tube connected to the rotating shaft so as to be rotatable in the processing chamber and supplied with a heat medium, and the coil shape A heating and stirring unit having a blade disposed on the outer peripheral side of the tubular body;
A jacket formed on the wall of the processing chamber and supplied with a heat medium;
A condensing unit that is provided in the processing chamber and cools and condenses the vapor from the object to be processed;
A suction pump for sucking the air in the processing chamber together with the condensed water condensed in the condensing unit;
A cooling deodorizing device that cools the cooling water circulating between the condensation unit to which the enzyme is added and adsorbs the air in the processing chamber sucked by the suction pump and the condensed water to the cooling water,
A recycling plant for marine waste, wherein the cooling and deodorizing device of the reduced-pressure fermentation drying device also serves as the contact device of the heavy metal removing device. A reduced-pressure fermentation drying apparatus for fermenting and drying marine waste in a reduced-pressure environment;
A molding apparatus for producing a solid fuel by mixing and molding a material to be processed by the above-described reduced-pressure fermentation drying apparatus and a combustible material formed from combustible waste;
A heavy metal removing device that removes heavy metal from at least one of a gas or a liquid generated by dry fermentation treatment of marine waste by the reduced-pressure fermentation drying device and dust or gas discharged from the molding device,
The combustible material includes a crushed piece in which at least one of a waste fishnet and a waste float as flammable waste is crushed,
A flammable material forming line for forming a flammable material to be charged into the molding apparatus;
This combustible material forming line is
A fish net crusher for crushing the salted waste fish net,
A wind power sorter that removes metal components from the crushed waste fishnet;
A marine waste recycling plant having a dry washing and dehydrating machine for washing and dewatering the separated waste fish net fragments. In the marine waste recycling plant according to claim 1 or 2 ,
A heat source device having a combustion furnace for burning the solid fuel,
The heavy metal removal device removes heavy metals from combustion gas discharged from a combustion furnace of the heat source device, and is a marine waste recycling plant. In the marine waste recycling plant according to claim 3,
A cleaning device for cleaning the combustion residue of the solid fuel combusted in the combustion furnace of the heat source device;
A marine waste recycling plant, comprising: a second heavy metal removing device that removes heavy metals contained in a cleaning liquid in which incineration residues are washed by the washing device. In the marine waste recycling plant according to claim 2 ,
The reduced pressure fermentation drying apparatus
A processing chamber in which the inside is depressurized and the object to be processed is accommodated with the enzyme added; and
A rotating shaft disposed in the processing chamber and supplied with a heat medium therein, a coiled tube connected to the rotating shaft so as to be rotatable in the processing chamber and supplied with a heat medium, and the coil shape A heating and stirring unit having a blade disposed on the outer peripheral side of the tubular body;
A marine waste recycling plant, comprising: a jacket formed on a wall of a processing chamber and supplied with a heat medium. In the marine waste recycling plant according to claim 1 or 5 ,
A marine waste recycling plant, wherein the heat medium is heated by the combustion heat of the solid fuel. In the marine waste recycling plant according to claim 3,
A recycling plant for marine waste, wherein the heat source device is a heat source device for a boiler for a fishery industry. In the marine waste recycling plant according to claim 1 or 2 ,
The marine waste recycling plant includes at least one of shellfish internal organs, squid internal organs, jellyfish, starfish, and seaweed temporary roots. In the marine waste recycling plant according to claim 1 or 2 ,
The above-mentioned molding device is a screw type molding device, a ring die type molding device, or a flat die type molding device.

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