JPH08206627A - Disposal method for waste of fish and shellfish - Google Patents

Abstract

PURPOSE: To provide a disposal method for a waste of fish and shellfish in which organic combustible portions in the waste of fish and shellfish are utilized effectively as a resource and dispose stably in a large amount without discharging a secondary waste. CONSTITUTION: Quicklimes are mixed into a waste of fish and shellfish, dehydrated and dried, and then used as a part of a cement raw material or an iron and steel raw material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for effectively utilizing residues of food and shellfish for food, wastewater sludge thereof, and organisms (hereinafter referred to as fish and shellfish waste) attached to cooling pipes of a power plant. is there.

[0002]

2. Description of the Related Art In the processing of fish and shellfish for food, a large amount of perishable wastes such as fish internal organs, shells and other concentrated liquid drainage are accompanied by odor. These are mainly brought into the municipal disposal site as municipal solid waste for disposal, but not only occupy most of the disposal site's capacity but also cause social problems such as foul odors and flies. Expenses are increasing year by year. Also, in thermal power and nuclear power plants, a large amount of cooling water is often collected by seawater collection, and a large amount of barnacles, mussels, oysters, jellyfish, and other plankton are attached to this pipe, and the pipe is blocked as it is. So we are removing them regularly. Even if the discarded products are left unattended, they are easily decomposed and it is difficult to dispose of them.

Conventionally, the correspondence between them has been disclosed in Japanese Patent Laid-Open No. 1-1574.
As seen in No. 90, attempts have been made to use it as fertilizers or feeds, but in addition to the need for storage and sorting to the demand area, things that have started to decompose and the mixture of many kinds of wastes. However, there is a problem that the types of things that can be actually used are limited, and it cannot be the mainstream of effective use.

There is also a disposal method in which fish and shellfish waste is incinerated, and the volume is reduced to landfill, but there is concern that elution of heavy metals and the like will occur.
Securing land for disposal and increasing disposal costs have become a problem, such as the need to solidify cement.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and effectively utilizes organic combustible portions in variously changing fish and shellfish wastes as resources, and further collects secondary wastes. It is an object of the present invention to provide a method for treating fish and shellfish waste that can be stably treated in large quantities without being discharged.

[0006]

In order to achieve the above object, according to the method of treating fish and shellfish waste of the present invention, quicklime is mixed with the fish and shellfish waste and dehydrated and dried (claim) Item 1) Mixing quicklime with fish and shellfish waste, dehydrating and drying, and then using it as a part of cement raw material or steel raw material (claim 2); mixing quicklime with fish and shellfish waste , Adding deodorant after dehydration and drying (claim 3), mixing quicklime with fish and shellfish waste,
After dewatering and drying, add a deodorant and use it as a part of a cement raw material or a steel raw material (Claim 4), and the deodorant is activated carbon, zeolite, activated clay,
At least one selected from the group consisting of bansulfate, iron sulfate, and fly ash (claim 5). Hereinafter, the present invention will be described in detail.

The fish and shellfish wastes treated in the present invention are mainly residues after collecting raw materials for food processing, wastewater sludge generated therewith, organisms attached to power plants, and the like. It is said that 4 million tons, 1 million tons of sludge, 500,000 tons of shellfish such as oysters, scallops and clams, and 1 million tons of organisms generated at power plants. Of these shells, some are effectively used for crafts and bird food, but most are shells,
It becomes a waste as a whole and is disposed of in landfill as it is or after incineration. These fish and shellfish wastes usually contain unspecified mixture of chemical composition such as internal organs, blood, bone, skin, shell, etc., water content, hardness, and microbial propagation, and they are transported and stored. It requires much quicker processing and is significantly more complicated to handle than other industrial products and raw materials. Table 1 shows an example of the composition of fish and shellfish waste.

[0008]

[Table 1]

The quicklimes mixed with fish and shellfish wastes are C
It contains aO as a main component and produces slaked lime by reacting with water in wastes of fish and shellfish. Specific examples thereof include quick lime, calcined dolomite, calcined shells, etc., and CaO component is 70% by weight or more. It is desirable to contain.

The particle size of quicklime and fish and shellfish waste is 50
The particle size may be less than or equal to mm, preferably less than or equal to 1 mm, but if there is crushing equipment at the time of mixing, the particle size may be adapted accordingly.

The amount of quicklime mixed depends on the particle size and water content of the fish and shellfish waste, but is generally 50 to 150 parts by weight, preferably 80 to 130 parts by weight based on 100 parts by weight of the fish and shellfish waste.
About parts by weight is used. If the amount of quicklime added is less than this range, the waste is not sufficiently dried and is not suitable as a raw material for cement or steel. If the amount of quicklime added is too large, the cost will increase, which is not preferable.

Various mixers can be used for mixing quicklimes and fish and shellfish wastes, but the higher the mixing efficiency, the better the characteristics of the obtained slaked lime / organic compound mixture (hereinafter referred to as "campun"). However, for example, by setting the mixing time to 3 minutes or more with a mixer capable of stirring at 10 rpm or more, it becomes possible to obtain a suitable camp having a water content of 5% by weight or less, and a Hobart mixer or the like is preferably used.

Thus, when the high-water content fish and shellfish waste is mixed with quicklime, the water in the waste and the quicklime are hydrated to produce slaked lime, in which case heat of about 63 KJ / mal is generated. This exotherm can raise the temperature of the mixture to about 150 ° C., and can obtain a campun having a water content of about 5% or less. Table 2 shows an example of the composition ratio of Campun mixed with quick lime having a CaO content of 94%.

[0014]

[Table 2]

Since bones, shells, strings, iron scraps and the like may be mixed in the camp, it is desirable to remove those of 50 mm or more, but separately sieving and crushing treatment in the cement manufacturing process etc. It is also possible to do so.

[0016] The spoilage component in the fish and shellfish waste becomes a stable compound by campunization, and all the fungi that cause spoilage are killed under high alkaline pH, so that the campun can be stored for a long period of time. Since the water has been removed, it can be easily transported by a tank truck or the like.

On the other hand, the camp remains mainly ammonia (NH ₃ ⁺ ), and then the so-called rocky odor of amines such as methylamine and trimethylamine. The amount of ammonia generated is as high as 0.1% / g (NH ₃ / Kampun) or more at 20 ° C, and its odor is unbearable when exposed to high temperatures such as summer, and deodorizes as necessary. It is desirable to add agents. The deodorant is selected from at least one selected from the group consisting of activated carbon, zeolite, sepiolite, activated clay, van sulphate, iron sulfate and fly ash. Activated carbon, zeolite, and sepiolite surface porous deodorants have a suitable deodorizing effect when the moisture content of Kampung is 3% or less. It becomes saturated and the ammonia adsorption effect cannot continue. Therefore, activated clay, van sulphate, iron sulphate, etc., which exert synergistically the effect of adsorbing and neutralizing ammonia, are preferably used, and when these are added in an amount of 1 to 5 wt. be able to.

Further, the fly ash can preferably bring out the deodorizing effect mainly by the ammonia adsorbing action of unburned carbon in the fly ash, and is added in an amount of 50% by weight or more, preferably 100% by weight or more based on Kampung. To do. The use of fly ash is effective in the use of fly ash, which is discharged in large quantities from thermal power plants, and most of it is landfilled. Can be the body.

Next, although Campun can be administered as it is as a soil conditioner or fertilizer, the present invention is particularly characterized in that Campun is used as a cement raw material or a steel raw material. That is, the inorganic substance in the camp is mainly composed of lime, and the fish and shellfish waste in the camp has a calorific value of about 20000 KJ / kg, and the camp is 25% by weight or less as a part of the cement raw material, preferably Is used in the cement manufacturing process together with other cement raw materials in the range of 15% by weight or less, or is also used in the iron manufacturing process as a part of the steel raw material. Organic substances can be effectively used as components and as a fuel source during firing.

The cement raw material applied to the present invention can be applied to waste cement mainly composed of Portland cement, alumina cement, and other municipal waste, and as a raw material for steel, it is for blast furnace injection. It can be suitably applied to raw material pellets or sintered ore.

[0021]

[Function] Water in fish and shellfish waste hydrates with quicklime,
And the amount of water is 5% by weight due to the heat generated during its hydration
The following stable compounds can be obtained, and fungi that cause spoilage are all killed under high alkaline pH, so that the compound can be stored for a long period of time. Minerals in Campun have lime as the main component, and fish and shellfish waste in Campun has a calorific value of about 20000 KJ / kg, so Campun can be suitably used as a raw material for cement or steel. By using it as a raw fuel for industries that perform long-term stable operation, a large amount of waste can be treated without generating secondary waste.

[0022]

【Example】

 (Materials used) The materials used in the examples are as follows. Raw stone ash 1: Limestone 950 ° C calcined product CaO content 94% or more Raw stone ash 2: Scallop shell 950 ° C calcined product CaO content 88% min 〃 2: Same as above Water treatment sludge 〃 83% 〃 3: Okhotsk scallop internal organs 〃 85% 〃 4: Crow shell attached to thermal power plants 〃 76% 〃 5: Same as above Jellyfish barnacle seaweed mixture 〃 95%

(Prototype of Kampung) 1 kg of waste and 1.5 kg of quick lime, which had been previously crushed to 5 mm or less, were placed in a 5 liter Hobart mixer, and mixed well for 15 minutes at low speed. With the hydration of quicklime, heat was generated and the water became water vapor and scattered. A mixture having a water content of 4% or less (a mixture of slaked lime and a dry product of waste) was aged for 12 hours to give a campun. The characteristics of Kampung are shown in Table 3. In the case of scallop viscera, the number of Escherichia coli was 2.20 × 10 ⁷ cells / gr before the treatment and is no longer detected after the treatment.

[0024]

[Table 3]

(Measurement of Ammonia Concentration) According to the odor intensity standard based on the odor prevention method, the ammonia concentration of 1 ppm is the concentration felt by all people. A 100 ml glass collection bottle was filled with 20 g of Campun and kept at a temperature of 40 ° C. for 16 hours, and then ammonia vapor accumulated in the upper space was measured by a detector tube. The results are also shown in Table 3. When the scallop-treated product was analyzed by gas chromatography, 0.2 ppm of methylamine, 1 ppm of trimethylamine, and 0.05 ppm of acetaldehyde were detected.

(Deodorizing step) The above collecting bottle is filled with 20
With g, activated carbon, zeolite, and activated clay as a deodorant were added and mixed in the range of 1 to 5% by weight with respect to Kampung, and the ammonia concentration was measured. The results are shown in Table 4. In each case, the ammonia concentration can be suppressed to 1 ppm or less, but especially activated clay showed an excellent deodorizing effect.

[0027]

[Table 4]

(Cementing step) The zeolite of 3% added in Table 4 obtained in the deodorizing step is internally divided into other cement compounding raw materials (limestone, clay, steel kalami added in a predetermined amount and ground). Of 10% by weight, pelletized and fired at a temperature of 1450 ° C. 2.5% by weight of gypsum was added to the obtained clinker to give a Blaine value.
It was ground to 3500 cm ² / g. This Portland cement was evaluated according to JIS R 5201. The results are shown in Table 5. The unit water content ratio and the mortar strength ratio are in comparison with commercially available ordinary Portland cement that does not use Kampung shown in the blank, and this invention is a cement that is comparable to ordinary cement and is used as a cement raw material. It was confirmed that it was possible.

[0029]

[Table 5]

(Manufacture of Blast Furnace Raw Material) Next, the zeolite of 3% added in Table 4 is used as another blast furnace raw material (iron ore, limestone, coke having a predetermined amount and a predetermined particle size).
Was added so as to be 5% by weight in the internal ratio, pelletized to φ5 mm, and fired in a rotary kiln having a focus temperature of 1380 ° C. It was confirmed that the crushed strength and melting point of any of the processed products such as mackerel, scallop and crow shells were within ± 5% as compared with those without added Campun, and could be used as a steel raw material.

[0031]

According to the present invention, by treating the fish and shellfish waste, it is possible to stably recycle the waste without generating secondary waste.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical indication location C02F 11/14 ZAB C C04B 7/24 C22B 1/00 (72) Inventor Keiichi Usura Tokyo Port 2-14-1, Nishi-Shimbashi, Tokyo Chichibu Onoda Co., Ltd. Resource Business Division

Claims (5)

[Claims] 1. A method of treating fish and shellfish waste, which comprises mixing quicklime with fish and shellfish waste, and dehydrating and drying. 2. A method of treating fish and shellfish waste, which comprises mixing quicklime with fish and shellfish waste, dehydrating and drying the mixture, and then using the mixture as a raw material for cement or a raw material for steel. 3. A method of treating fish and shellfish wastes, which comprises adding quicklime to fish and shellfish wastes, dehydrating and drying the mixture, and then adding a deodorant. 4. A fish and shellfish waste characterized by being mixed with quicklimes in fish and shellfish waste, dehydrated and dried, and then added with a deodorant and used as part of a raw material for cement or steel. Processing method. 5. The fish according to claim 3, wherein the deodorant is at least one selected from the group consisting of activated carbon, zeolite, activated clay, van sulphate, iron sulfate, and fly ash. Treatment method of shellfish waste.