JPH0928308A - Treatment of waste matter from scallop and installation therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process and equipment which can use the waste matters from scallops as a raw material for animal feeds or fertilizers by removing heavy metals from the waste matters of scallops. SOLUTION: The waste matters from scallops are stirred together with fresh water in the washing tank 16 to effect washing and the washing mixture is separated with a dehydrator into the solid matter and the waste water containing a small amount of the waste matter whereby the solid matter free from heavy metals is obtained. This solid matter is used as a raw material to produce animal feed or fertilizer. In the meantime, the waste water containing a small-amount of waste matter recovered after the phase separation is heated in the coagulation tank 36 to coagulate the heavy metals together with protein, then the sludge containing the heavy metals coagulated together with protein is recovered using a decanter 38 and the recovered sludge is incinerated.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method and an apparatus for treating scallop remnants, and more specifically, to gonads, midgut glands (uros), kidneys, mantles (strings), etc. of scallop remnants. Using the residue generated when processing the scallop scallop residue, the harmful heavy metals such as cadmium (Cd) and arsenic (As) contained in the residue were reduced, removed or diluted, and treated. The present invention relates to a method and an apparatus for treating scallop residue, which is produced as feed fertilizer using scallop residue as a raw material.

[0002]

2. Description of the Related Art Scallops are mainly used for the processing of scallops. The parts with the most residues left over during the processing of this scallop are the shell and internal organs, and internal organs other than the shell are also removed for the purpose of preventing the occurrence of shellfish poison,
The midgut (uro), gonads, kidneys, gills, mantle (so-called "strings"), anus, intestines, heart, stomach, and lungs are discarded as debris.

In the present specification, the scallop residue is
In addition to the above-mentioned gonads, midgut glands (uro), etc., it includes scallops that have been discarded because they are not suitable for food due to deterioration in freshness.

It is known that this scallop residue contains not only proteins and lipids but also tasting components such as free amino acids and nucleic acids and useful substances such as EPA and carotenoids. The use of foods or useful substances as raw materials for extraction has been studied in the past.

However, cadmium (Cd) and arsenic (A) are found in the above-mentioned residue of the scallop, especially in the midgut gland (uro).
Harmful heavy metals such as s) are accumulated in high concentration, and the existence of these heavy metals hinders effective use of the scallop residue.

[0006] Therefore, conventionally, although attention has been paid to the usefulness of the scallop residue, the residue has not been used and has been disposed of by burying or incineration. In addition, the processing costs for the above-mentioned burial treatment and incineration treatment put pressure on the management of scallop processors, and the heavy metals generated by the burial treatment cause environmental pollution of rivers, soil, etc., and the deterioration of residues. The generation of offensive odors has a significant impact on the surrounding environment.

Focusing on these problems, a method for effectively utilizing the scallop residue by removing heavy metals, especially cadmium (Cd), from the scallop residue has been studied. That is, the method of removing cadmium (Cd) by immersing the residue of scallops in an acid and then repeating washing with water several times, and in addition to the removal by the acid soaking, the cadmium (Cd) transferred into the acid is electrolyzed into a cathode. A method of depositing and removing it on the surface has been studied.

The mantle film in the scallop slag has a very low content of heavy metals such as cadmium and can be processed into various processed foods, so it is traded relatively expensively. The work was done manually one by one.

[0009] As the amount of scallop shellfish caught by aquaculture increases, the number of parasites such as starfish attached to aquaculture facilities that are collected together with the scallop shells also increases. These parasites such as starfish were buried or incinerated together with the scallop residue.

[0010]

According to the above-mentioned method for extracting heavy metals by pickling, the residue that has been pickled using a chemical such as dilute sulfuric acid requires subsequent washing with water several times, and a large amount of water is removed. In addition to being necessary, a facility with a large aquarium is required. In addition, equipment for neutralizing and treating the acid used to wash the residue and equipment for removing heavy metals dissolved in the acid are required, which makes the equipment large and installation costs enormous. However, it takes a lot of time and money to neutralize the acid and process the heavy metal dissolved in the acid.

Further, the use of an acid such as dilute sulfuric acid accelerates the corrosion of various devices including the drier, and the service life of the device itself is reduced.

Further, in addition to the above-mentioned pickling, when removing by precipitation by electrolysis, equipment such as an electrolytic bath is required, and it takes a long time to deposit cadmium (Cd), and the treatment time is longer. It will be even longer.

Further, the mantle is manually collected as described above.
As the cost becomes extremely high and the labor cost has risen in recent years, the mantle part of the scallop residue is not collected and is discarded as the residue like other parts and is not effectively used.

According to various experiments, the present invention shows that the scallop residue contains a large amount of heavy metals such as cadmium (Cd) and arsenic (As). It is a relatively soft part of the kidney, gonad, etc.
The portion containing a large amount of heavy metals in the raw material composed of the scallop remnants can be relatively easily removed by washing, and the midgut gland (uro) of the scallop remnants,
As a result of the fact that the heavy metals contained in the soft parts of the kidneys, gonads, etc. do not move to other parts before the raw material is heated, as a result, the soft parts containing a large amount of this heavy metal should be removed before the raw materials are heated. Cadmium (C
It was made based on the finding that it is possible to remove most of the heavy metals such as d) and arsenic (As). It is quick to stir and mix the raw material with washing water without using acid. And by removing the heavy metal in the raw material by a low cost method, the heavy metal extracted in the wastewater is recovered without electrolytic treatment, and further, the heavy metal is removed from the scallop residue, thereby removing the scallop residue. An object of the present invention is to provide a method and an apparatus for treating scallop slag that can be effectively used as a raw material for animal fertilizer.

Another object of the present invention is to use a raw material consisting of scallop remnants as a raw material, which is a parasite such as a starfish attached to a scallop aquaculture facility, and other fish and shellfish preferably containing no heavy metals other than scallop remnants. Meat of scallop remnants produced by diluting with fish remnants, crustaceans, crustacean remnants, etc., or produced from scallop remnants does not contain heavy metals from animals other than scallops. By producing a fertilizer as a product by diluting it with meal, the concentration of heavy metals remaining in the fertilizer is further reduced, the scallop residue is effectively used, and the costs associated with the residue treatment according to the present invention are offset and reduced. In addition to the purpose of aiming to achieve, it is possible to effectively use the abandoned parasites such as starfish as a raw material for animal fertilizer to offset and reduce the costs for landfill or incineration. It aims to promote the effective use of.

[0016] Another object of the present invention is to stir and wash the raw material together with washing water when washing the raw material so that the mantle film containing a small amount of heavy metals is manually produced from the residue of the scallop. It is possible to recover the cost without waste, and the purpose is to recover the cost associated with the treatment of the residues by the economic benefit of recovering the mantle.

[0017]

In order to achieve the above object, the method for treating scallop residue according to the present invention uses a scallop residue as a raw material, and the raw material is washed with washing water to remove heavy metals in the raw material. Removed, the washing raw material is drained and separated into wastewater containing solid matter and minute residues, respectively, and collected, while obtaining a solid matter from which heavy metals have been removed, wastewater containing the separated minute residues is recovered, It is characterized in that the wastewater containing this minute residue is heated to separate heavy metals from the wastewater as sludge.

The raw material from which heavy metals have been removed can also be used as a raw material for producing fertilizer, and after washing the raw material with washing water to remove the heavy metals in the raw material, the washing raw material is separated into solids and fine particles. The heavy metal-removed solid obtained by separating the wastewater containing residue is boiled and squeezed, and then squeezed, and the boiled raw material is separated and collected into a press cake and press water, and the collected press cake is dried. It can be fertilizer.

In order to more reliably remove the heavy metal from the raw material by the above method, it is preferable to repeat the step of washing the raw material a plurality of times.

If the heavy metal concentration in the fertilizer produced from the scallop residue is still high, the press cake is dried and, if necessary, crushed to obtain a meal fertilizer. In addition to the scallop residue, mix and dilute meals produced as animal fertilizers made from animals such as fish and shellfish, fish and shellfish residues, crustaceans, crustacean residues, and echinoderms such as starfish. You can also

[0021] Another method of treating scallop remnants of the present invention is to use a raw material comprising scallop remnants as a raw material for fish and shellfish, preferably minor fish, and processed residues of fish and shellfish (fish heads, viscera, mid-bones, tails, etc.). ), Crustaceans, processed residues of crustaceans (heads, shells, internal organs, tails, etc.), and raw materials composed of animals other than scallop residues such as starfish and other scallop shells are mixed to dilute and reduce the concentration of heavy metals. It is characterized in that animal fertilizer is produced from this mixed raw material. Further, it is economically extremely advantageous to collect the mantle from the separated solid matter.

Furthermore, the treatment device for removing heavy metals from the scallop residue of the present invention for carrying out the above method,
One or more washing means for washing a raw material consisting of scallop residue together with washing water; one or more solid-liquid separating means for separating and recovering the washing raw material into waste water containing a minute residue and solid matter; Heat the wastewater containing the collected minute residue,
It is provided with a separation means for separating heavy metals as sludge, and on the other hand, as an apparatus for producing animal manure,
1 or 2 or more cleaning means for cleaning a raw material composed of scallop slag with cleaning water, and 1 or 2 or more for separating the cleaning raw material into a wastewater containing a minute slag and a solid matter, and recovering the separated solid matter The solid-liquid separation means of, the simmering means for simmering the solid matter recovered by the solid-liquid separation, the squeezing means for squeezing the simmering raw material saged by the simmering means, It comprises a drying means for drying the presscake.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION

1. Method and apparatus for treating scallop residue 1-1. Removal of Heavy Metals and Treatment of Removed Heavy Metals An apparatus for removing heavy metals from a raw material composed of scallop residue is a washing tank 1 for stirring and washing the raw material with washing water.
6, 16 ', etc., a washing means, a solid-liquid separation means such as a dehydrator 30, 30' for draining the cleaning raw material to separate and collect into a waste water containing a minute residue and a solid matter, and a recovered minute residue. Separation means comprising a coagulation tank 36 for heating wastewater containing wastewater, a decanter 36 for separating sludge containing heavy metals generated in the wastewater by this heating from wastewater, an incinerator 38 for incinerating the separated sludge containing heavy metals, etc. It consists of incineration means.

Raw materials such as scallops and scallop residues from which shells have been removed are stirred and washed in the washing tanks 16 and 16 'together with washing water, and the midgut glands (uro) containing a large amount of heavy metals in the raw materials, Dissolve soft parts such as kidneys and gonads in washing water.

Thereafter, the cleaning raw material is fed to the dehydrators 30 and 3
It is dehydrated by a solid-liquid separation means such as 0 ', and separated and collected into wastewater containing solid matter and minute residues to obtain a solid matter from which heavy metals have been removed. The cleaning tanks 16 and 16 'and the dehydrator 3
The washing and dehydration with 0, 30 'are suitably repeated a plurality of times, preferably two steps.

Thereafter, the waste water containing the collected minute residues is heated in the coagulation tank 36, and the proteins constituting the soft parts such as the midgut glands (uro), kidneys, gonads, etc., which have collapsed and dissolved in the waste water, are heavy metals. The heavy metal coagulated together with the protein is separated from the wastewater as sludge by the decanter 38, and the separated sludge is incinerated in the incinerator 40.

1-2. Manufacture of animal manure with reduced heavy metal concentration The manufacturing device of animal fertilizer with reduced heavy metal concentration includes washing means such as washing tanks 16 and 16 'for stirring and washing the raw material with washing water, and the washing raw material Solid-liquid separation means such as dewatering machines 30 and 30 'for separating and collecting wastewater containing solids and solid matter, simmering means such as simmering machine 56 for saturating the collected solids, and simmering this It is provided with a squeezing means such as a squeezing machine 58 for squeezing the raw material to separate and collect it into a press cake and a press water, and a drying means such as a dryer 60 for drying the collected press cake. The dried press cake can be crushed and sized by a crusher 52 or the like to produce a meal used as a feed fertilizer.

Raw materials such as scallops and scallop residue from which shells have been removed are stirred and washed in the washing tanks 16 and 16 'together with washing water so that the midgut glands (uro) containing a large amount of heavy metals in the raw materials, Dissolve soft parts such as kidney and gonad during washing.

Here, the stirring mainly prevents the raw materials from staying in the cleaning tanks 16 and 16 ', and the crushing of the relatively soft midgut and reproductive lines of the raw materials is mainly caused by the pumps 27 and 29. Done by.

Thereafter, the cleaning raw materials are dehydrated by the dehydrators 30, 3
It is dehydrated by a solid-liquid separation means such as 0'and separated into a solid matter and a waste water containing minute residues to obtain a solid matter from which heavy metals have been removed. The stirring / washing and solid-liquid separation are preferably repeated a plurality of times as shown in the examples. Therefore, in the first washing step, in consideration of the case where the midgut line and the genital line were not completely crushed, and in the second washing step, the crushed genital line and the midgut line did not adhere to the mantle. ,
Clean water is injected and cleaning is performed again.

The solid matter from which the heavy metals have been removed is then boiled by a simmering machine 56 and further squeezed by a squeezing machine 58, so that the simmering raw material is separated and collected into a press cake and a press water. The collected presscake is dried with a dryer 6
After drying at 0, it is pulverized to obtain a fertilizer made from scallop residue.

When the heavy metal concentration in this fertilizer is still high, the above-mentioned fertilizer contains other fish and shellfish, preferably fish and shellfish residues, crustaceans, crustacean residues, and echinoderms such as starfish. , Meal made from animals other than scallop residue is mixed to dilute and reduce the concentration of heavy metals contained.

It should be noted that, without washing the above-mentioned raw materials,
A raw material such as scallop remnants is mixed with other raw materials such as fish and shellfish, remnants of fish and shellfish, crustaceans, remnants of crustaceans, echinoderms such as starfish, and diluted raw materials. After ripening with the simmering machine 56, squeezing with the squeezing machine 58,
It is also possible to separate and recover the boiled raw material into a press cake and press water, dry the collected press cake with a dryer 60, and then pulverize with a pulverizer 52 to obtain a fertilizer using scallop residue as a raw material.

[0034]

Embodiments of the present invention will now be described with reference to the accompanying drawings.

1. Raw material The raw material used in the present invention is a residue obtained by removing the scallops and shells from the natural or cultured scallop residue, and the internal organs.
Use Table 1 shows the weight ratio of each internal organ contained in the raw material.

[0036]

[Table 1]

So-called "uro" in each organ in the raw material
The midgut gland part called "cadmium (CD)" contains the largest amount of heavy metals, especially cadmium (Cd).
The content of C varies depending on the season, but scallops with the lowest content in June contain 1.6 ppm, and the largest content in October, contain 34.3 ppm of cadmium.

As an example, Table 2 shows the results of measuring the content of heavy metals (only cadmium) in each internal organ contained in 1000 g of the natural scallop residue collected in October.

[0039]

[Table 2]

Incidentally, when the raw materials shown in Table 2 are simply dried to produce a fertilizer, the cadmium which flows out together with the extract such as press water when the raw materials are pressed is about 54.3.
%, 4.9− (4.9 × 0.543) = 2.24 mg of cadmium still remains in the solids in the raw material. Since the water content in the raw material is about 80%, when this raw material is dried to a water content of 8%, it becomes 217.4 g, which is 2.24 mg in 217.4 g of the dry raw material, that is, 10. 3 ppm of cadmium (Cd) will remain.

2. Removal and Treatment of Heavy Metals The above-mentioned raw materials are subjected to removal of heavy metals in the raw materials by the following method and apparatus.

2-1 Removal of heavy metals by washing and recovery of solids from which heavy metals have been removed 12 in FIG. 1 indicates a hopper. Through this hopper 12,
A raw material consisting of scallop residue is added. This hopper 1
2 is connected to the inlet 18 of the cleaning tank 16 via a conveying means such as a screw conveyor 14 connected to the bottom of the cleaning tank 16. Therefore, the raw material put into the hopper 12 is
It is conveyed by the screw conveyor 14 and put into the first cleaning tank 16.

The first cleaning tank 16 stirs and cleans the raw material charged inside together with the cleaning water. The first cleaning tank 16 is provided with a cylindrical container 20 for containing the raw material and the cleaning water, and uses a motor or the like as a drive source. A stirring blade 22 that swirls in the container 20 is provided. Further, on the outer wall of the container 20 of the first cleaning tank 16, a water supply port 2 for supplying cleaning water into the container 20.
4 is provided, and the water supply port 24 is
It is connected to a washing water supply source (not shown).

The first cleaning tank 16 configured as described above
When the raw material is supplied into the container, the raw material is stirred and washed by the swirling of the stirring blades 22 together with the cleaning water supplied into the container 20 through the water supply port 24, and the midgut gland (uro) in the raw material is supplied. (Cd) and arsenic (As) such as kidney, kidney and gonad
The soft part containing a large amount of metal is finely crushed by the water flow caused by the swirling of the stirring blade and melts into the wash water, and some heavy metal also melts out into the wash water from other parts where cadmium (Cd) etc. adhere. The heavy metals in the raw material are removed.

The first cleaning tank 16 is connected to the first dehydrator 30 via a discharge port 26 provided on the side surface of the container 20 of the first cleaning tank 16. The first dehydrator 30 and the discharge port 26 of the first cleaning tank 16 are connected to each other via a pipe provided with a pump 27, and the first cleaning tank 1
The raw material and the washing water which are stirred and washed in 6 are further crushed through the pipe and the pump 27, and the soft portion is conveyed into the first dehydrator 30.

The first dehydrator 30 is provided with the cleaning tank 1
The cleaning material cleaned in 6 is a solid material, that is, a solid material from which a soft portion containing a large amount of heavy metals has been removed, and when the soft material passes through the pump 26, it is finely crushed and dissolved. It is for separating it into wastewater containing residue, and the cleaning material is passed through a wire net etc. together with the wastewater containing minute residue, and the solid matter remaining on this wire net and the soft part in the raw material that has passed through the wire net are It is configured to be able to collect the wastewater that has melted.

The solid matter in the cleaning raw material drained and recovered by the first dehydrator 30 in this manner is passed through the pipe connected to the discharge port 34 of the first dehydrator 30 to perform the first cleaning. It has the same structure as the tank 16 and is charged into the second cleaning tank 16 ′ that communicates with the cleaning water supply source through the water supply port 24 ′, and the same processing as the processing in the first cleaning tank described above is performed, In the first washing step, infuse the midgut line and genital line which were not completely crushed, and in the second washing step, clean wash water was injected so that the crushed genital line and midgut line did not adhere to the mantle. And then washed again,
After that, it is crushed into smaller pieces through the pump 28,
The second dehydrator 3 connected to the second cleaning tank 16 '
It is sent to 0 ', drained by the dehydrator 30' and separated into solid matter and drainage water containing minute residues, and the separated solid matter is discharged from the discharge port 34 'of the second dehydrator 30' to produce fertilizer, etc. It is fed to the animal fertilizer manufacturing apparatus shown in FIG.

The washing raw material recovered as the solid material contains a mantle film (so-called "string") of scallop residue separated from other parts, and only this string part is contained. The dehydrator 30 or 30 'can be recovered and used separately as a raw material for processed foods.

In this embodiment, the waste water separated by the second dehydrator 30 'is supplied to the second cleaning tank 1 through the pipe.
It is returned to the inside of 6'and reused as washing water for washing the raw material in the second washing tank 16 '. Further, the cleaning water in the second cleaning tank 16 ′ is fed into the first cleaning tank 16 through a pipe connected to the lower end of the second cleaning tank 16 ′, and by the first dehydrator 30. The separated wastewater is returned to the first cleaning tank 16 via the pump 29 and reused as cleaning water for cleaning the raw materials in the first cleaning tank 16. As described above, by circulating and using the waste water between the first cleaning tank 16 and the second cleaning tank 16 ′, the amount of cleaning water used for cleaning the raw material can be reduced as much as possible.

The waste water used for cleaning the raw material in this way is then fed into the coagulation tank 36, which will be described later, through the pipe connected to the container 20 of the first cleaning tank 16.

The waste water containing the minute debris separated by the dehydrators 30 and 30 'is washed tanks 16 and 16'.
This may be fed as it is to the coagulation tank 36 described later without returning it to the inside again. Further, in the present embodiment, the configuration in which two cleaning tanks and two dehydrators are provided is described, but the cleaning tank and the dehydrator are described. May be a single one.

2-2 Treatment of Removed Heavy Metal As described above, in the wastewater separated and collected through the dehydrator 30, 30 ', the cleaning tanks 16 and 16' and the pumps 27 and 28 are treated. It contains small residues such as the midgut gland (uro), liver, and gonads that contain a large amount of heavy metals dissolved in the wastewater after being stirred, washed, and transferred into small pieces. Therefore, the wastewater containing the collected minute residues cannot be discharged as it is to a river or the like, and is treated by the following method and apparatus.

Reference numeral 36 in FIG. 1 denotes a coagulation tank, and the waste water containing the minute residue separated from the cleaning raw material is fed into the coagulation tank 36. In the coagulation tank 36, the waste water containing the minute residue introduced therein is heated by the steam introduced from a steam generation source (not shown).

Cadmium (Cd) in the scallop residue is
When this is heated, it tends to move to the protein side,
Moreover, since the minute residues such as the midgut gland (uro), the kidney, and the gonad that are finely crumbled and dissolved in the drainage are mainly composed of protein, by heating the drainage containing the minute residues in the coagulation tank 36, Cadmium (Cd) in the drainage migrates to the protein side of the midgut gland (uro), kidneys, gonads, etc., and the proteins of the midgut gland (uro), kidneys, gonads, etc. coagulate by heating and are discharged. Becomes sludge. Further, this solidification suppresses the transfer of cadmium (Cd) from the sludge to the drain side.

In this way, the wastewater containing the minute residues heated in the heating tank 36 is then fed to the decanter 38 connected to the coagulation tank 36 via a pipe to remove sludge in the wastewater. Separated into water. In addition,
Although the decanter 38 shown in the figure is a horizontal type, any of a horizontal type and a vertical type can be used as long as the sludge can be removed.

In this way, by the decanter 38,
The sludge separated and collected from the waste water is then conveyed to the incinerator 40 and incinerated in the incinerator 40, and the residual ash containing heavy metals such as cadmium (Cd) is treated as industrial waste. . When incinerating the sludge, the sludge may be dried by a dryer (not shown) before incinerating.

On the other hand, the water separated and recovered from the wastewater is
After being sent to the wastewater treatment facility 42 to remove floating substances in the water, excess sludge, etc., they are discharged into a river. The suspended solids and excess sludge removed in the wastewater treatment facility 42 are sent to the incinerator 40 together with the sludge and incinerated, and the residual ash is collected as industrial waste.

3. Manufacture of Animal Fertilizer As described above, the solid matter separated from the washing raw material has a very low content of heavy metals and can be used as a raw material for animal fertilizer.

FIG. 2 shows a schematic view of a production apparatus for producing feed fertilizer using the solid matter separated from the washing raw material as a raw material.

The animal fertilizer production apparatus shown in FIG. 2 is used for the production of animal fertilizer using the scallop residue from which the above-mentioned heavy metals have been removed as a raw material, as well as fish and shellfish residues after processing, crustaceans,
Manufacture of diluting meal made from processed residues of crustaceans, parasites (eg, echinoderms such as starfish) attached to scallop aquaculture facilities, and mixed fertilizers obtained by mixing the raw materials Also used when manufacturing. In addition,
When the heavy metal content in the scallop residue is low depending on the time, the step of removing the heavy metal by the washing described above is omitted, and the mixed raw material obtained by mixing the scallop residue and other raw materials such as starfish is directly added to the raw material tank 50 described below. It can also be thrown in.

Hereinafter, solids separated from the washing raw materials, fish and shellfish residues, crustaceans, crustacean residues, starfish and other parasites, or a mixed raw material obtained by mixing the aforementioned raw materials, and washing Untreated scallop residues and non-scallop residues such as fish and shellfish residues, crustaceans,
The mixed raw material obtained by mixing the processing residues of crustaceans, animal raw materials such as starfish and other echinoderms will be collectively referred to as “raw material”.

In FIG. 2, reference numeral 50 denotes a raw material tank, and the raw material is put into the raw material tank 50. When a starfish is used as a raw material and when scallop slag that has not been washed is mixed with a starfish to form a raw material in which heavy metals have been diluted, the starfish is crushed by a pulverizer 52 before charging the raw material tank 50. After crushing, the raw material tank 50 is charged.

At the bottom of the raw material tank 50, a raw material conveying means 54 such as a pipe equipped with a screw conveyor or a pump.
It is connected to the simmering machine 56 through the raw material tank 50.
The raw material charged therein is supplied into the simmering machine 56 through the raw material conveying means 54.

This simmering machine 56 heats and simmers the raw material charged therein by the heat introduced from a heat source (not shown). In this embodiment, steam introduced from a boiler (not shown) Indirect heating by means of heating the raw material charged into the simmering machine 56.

The raw material boiled by the boiler 56 in this way is then conveyed by a conveying means 54 such as a screw conveyor.
It is conveyed to the press 58 through the press, compressed in the press 58, separated into a press cake and press water, and collected.

The collected press cake was dried by the dryer 6
0, and after being dried to a moisture content of about 8% in the dryer 60 by the heat introduced from a heat source (not shown), it is crushed by the crusher 62 and then stored as a meal in the silo 66. To be done.

In addition to the solid matter separated from the scallop residue after washing, in order to produce a meal for dilution, fish shellfish and fish shell residue, crustaceans, crustacean residues, and echinoderms such as starfish are used. When the raw materials are individually used as raw materials and treated in the same manner as the scallop residue, the crushed meal is sorted according to the raw materials by the shifter 64 and stored in separate silos 66.

When the raw material is a solid content separated from the washed scallop residue, and when it is a mixed raw material obtained by diluting the unwashed scallop residue with another raw material, the crusher 6 is used.
After milling according to 2, the concentration of heavy metals still remaining in the milled meal is measured. And, for example, when the heavy metal is cadmium (Cd), the
August, 2000, 2.5ppm or less, which is stipulated by the "Feed Safety Act""guidance standard for harmful substances in feed",
For fertilizers, a value of 0.8 ppm or less per 1.0% of the total nitrogen content stipulated in the "Fertilizer Control Law" (December 2, 1991, Ministry of Agriculture, Forestry and Fisheries Notification No. 1416, "Fertilizer Official In the case of "standard"), the crushed meal can be shipped as it is as a product, but if it exceeds this standard, a mixer 68 connected to the bottom of each silo 66 allows other milled meals such as fish, Fish remnants, fish meal (fish meal) made from starfish, and meal made from starfish are mixed to dilute the heavy metal concentration below a predetermined value to obtain a domestic fertilizer as a product.

Even when the concentration of heavy metals is below a predetermined value, it is possible to mix the heavy metals as a product according to the purpose of use.

Next, the press water obtained by the pressing by the pressing machine 58 and the press water dropped from the conveying means 54 when the raw material is transferred from the simmering machine 56 to the pressing machine 58 are collected. The pressed water is transported into the decanter 70, and sludge in the pressed water is separated and collected. This recovered sludge is
Mixer with press cake and dryer with press cake 6
It is transported to 0 and forms part of the product.

The press water from which the sludge has been removed is conveyed to the three-layer separator 72, and the sludge, oil and stick water are separated from the press water,
Collect each.

The collected stick water is then conveyed to the evaporator 74 and concentrated, and the concentrated stick water is mixed with the press cake before being dried. The evaporator 74 requires the introduction of heat from an external heat source when the sticky water is concentrated. In this embodiment, the steam discharged from the dryer 60 is introduced as the heat source. There is. In this way, by using the steam discharged from the dryer 60 as a heat source, the exhaust heat can be effectively used, and the steam passing through the dryer 60 is not directly released to the atmosphere. It is possible to prevent an adverse effect on the surrounding environment due to the generation of a bad smell or the like. The steam that has passed through the evaporator 74 is washed with water and then the boiler 76.
It is transferred to the US and is removed to the atmosphere after removing dust and odors remaining by incineration.

The oil content recovered by the three-layer separator 72 can be provided as a product itself as a by-product of fertilizer production.

The control of each of the above devices can be centrally controlled by the operation panel 78.

[0075]

With the configuration of the present invention described above, the present invention has the following unique effects.

(1) By washing the raw material before heating with water and removing the portion containing a large amount of heavy metal in the raw material by the external force during the washing, the heavy metal contained in the portion is transferred to another portion. The heavy metal in the scallop residue can be removed by a relatively simple method of washing with water, and the removed heavy metal can be easily collected and removed.
It was possible to provide a method and a device for treating scallop residues that can be treated.

(2) Further, the scallop residue from which heavy metals have been removed or diluted can be obtained by the method and apparatus of the present invention, and by using this residue from which heavy metals have been removed as a raw material, fertilizer is produced. It was possible to obtain domestic fertilizer as a by-product for the treatment of scallop residue, and it was possible to bring an economic benefit to the treatment of scallop residue, which was conventionally required to be economically burdened.

(3) Since the mantle film of the scallop residue, which has been conventionally collected manually, is removed from other parts during the cleaning and transfer of the raw materials, it is possible to compare at a low cost without manual work. By recovering the mantle of high economic and economic value, it was possible to offset and reduce the costs associated with the waste treatment.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an apparatus for removing heavy metals in the treatment of scallop residues of the present invention.

FIG. 2 is a schematic view of an apparatus for producing feed manure in the treatment of scallop residues of the present invention.

[Explanation of symbols]

 12 Hopper 14 Screw Conveyor 16, 16 'Cleaning Tank 18 Input Port (For Cleaning Tank) 20 Container (For Cleaning Tank) 22 Stirring Blade 24, 24' Water Supply Port 26 Drainage Port 30, 30 'Dewatering Machine 34 Discharge Port 36 Coagulation Tank 36 Decanter 38 Incinerator 50 Raw material tank 52 Crusher 54 Conveyor means 56 Boiler 58 Compressor 60 Dryer 62 Crusher 64 Shifter 66 Silo 68 Mixer 70 Decanter 72 Three-layer separator 74 Evaporator 76 Boiler

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[Procedure amendment]

[Submission date] August 17, 1995

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

[Fig. 2]

Claims (10)

[Claims] 1. A scallop shell residue is used as a raw material, the raw material is washed with washing water to remove heavy metals in the raw material, and the washing raw material is separated into a solid matter and waste water, respectively, and collected to remove heavy metals. A method for treating scallop residue, wherein a solid matter is obtained, the separated wastewater is recovered, and the wastewater is heated to separate heavy metals from the wastewater as sludge. 2. A scallop residue is used as a raw material, the raw material is washed with washing water to remove heavy metals in the raw material, and the washing raw material is separated into solid matter and waste water containing minute residues to remove heavy metals. The obtained solid cake is boiled and squeezed after the heavy metal is removed, the raw material is separated into a press cake and stick water to collect the press cake, and the collected press cake is collected. A method for treating scallop residue, which is characterized by drying. 3. The method for treating scallop residue according to claim 1, wherein the step of washing the raw material with washing water is repeated a plurality of times. 4. The method for treating scallop residue according to claim 1, wherein the mantle is collected from the separated solid matter. 5. A meal obtained by drying the press cake and, if necessary, crushing the meal, is used as a fertilizer, and the meal used as the fertilizer is a fertilizer produced from an animal other than scallop residue. The method for treating scallop remnants according to any one of claims 1 to 4, wherein the meal is mixed to dilute the heavy metal concentration. 6. A raw material composed of scallop remnants is mixed with a raw material composed of animals other than scallop remnants to obtain a mixed raw material having a relatively heavy metal concentration diluted and reduced, and the mixed raw material is squeezed after ripening. A method for treating scallop residue, which is characterized in that the collected press cake is separated and collected into a press cake and press water, and the collected press cake is dried and used as a fertilizer. 7. The method for treating scallop remnants according to claim 6, wherein the animal raw material other than the scallop remnants is fish and shellfish, crustaceans, preferably fish and shellfish remnants, crustacean remnants, or starfish. 8. A stirring means for washing a raw material composed of scallop slag with washing water, a solid-liquid separation means for separating and collecting the washing raw material into waste water and solid matter containing minute slag, and the recovered minute slag An apparatus for treating scallop slag, comprising a separation means for heating waste water containing the slag and separating heavy metals as sludge. 9. A stirrer means for washing a raw material composed of scallop slag with washing water, and a solid-liquid separation for separating the washing raw material into wastewater containing a small amount of slag and a solid, and recovering the separated solid. Means for simmering the solid matter recovered by the solid-liquid separation means, squeezing means for squeezing the simmering raw material smelted by the simmering means, press cake obtained by the squeezing An apparatus for treating scallop residue, comprising a drying means for drying. 10. A plurality of washing means for washing the raw material with washing water, and a plurality of solid-liquid separating means for separating the washing raw material washed by the washing means into waste water containing solid matter and minute residues, respectively. 8. A device for treating scallop residue according to item 8.