JP2000072578A - Production of organic fertilizer of shellfishes fouled in cooling water channel or the like of condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing an organic fertilizer by which shellfishes such as Mytilus edulis thickly growing in a seawater intake channel, etc., of various kinds of plants such as power stations can simply be converted into a fertilizer at a low cost. SOLUTION: An operation to remove shellfishes in a water intake channel →a step for grading shells and shell fleshes (vibrating type or rotating type grading) → a step for dehydrating treatment with a centrifugal separator to a pulverizing step with a shell pulverizer are performed in the spot. An organic fertilizer is then produced by a step for fermentation treatment with a primary fermenting machine → a step for secondary fermentation treatment in a room →a step for pelletizing. The pulverized shells or shell fleshes, etc., are blended with an organic fertilizer raw material for promoting the fermentation such as poultry manures, coffee bean pulps or organic sludges to thereby recycle most of the shells, algae, sludges, etc., collected from the water intake channel to the organic fertilizer. The cost can remarkably be reduced by the treatment on the spot.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an organic fertilizer for shellfish attached to a plant intake channel, and more particularly to a cooling channel or a ship bottom used for a condenser in a thermal power plant or a nuclear power plant. The present invention relates to a method for producing an organic fertilizer of attached shellfish such as a condenser cooling water channel suitable for converting the shellfish attached to the fertilizer into fertilizer.

[0002]

2. Description of the Related Art A large amount of mussels, mainly mussels, attached to condenser cooling channels of thermal power plants and nuclear power plants, are removed from the channels and disposed of as landfill or industrial waste. That is the current situation.
However, in the future, there is a concern that there will be a shortage of landfill sites, and from the viewpoint of protecting the global environment, there is a demand for socially effective use of fertilizers.

[0003] Although electric power companies are actively working on the conversion of the shellfish into fertilizer, the price of the processing equipment is enormous, and in addition to requiring a large amount of heat source and power in the processing process, a special operation is required. At present, they do not get on a commercial base because of the need to operate with staff. Furthermore, even if fertilizer is used, the use of the soil conditioner and the like is limited due to its components, so there are many places where fertilizer companies have to pay for it or landfill it.

[0004] For the fertilization of shellfish attached to cooling water channels in thermal power plants and nuclear power plants, squeezing, pulverization, and mixing with montmorillonite to produce organic fertilizer (Japanese Patent Application Laid-Open No.
200280), a method in which calcium oxide is added to shellfish and then heated and dried to obtain a fertilizer (JP-A-59-1984).
No. 156989) and after washing the shellfish with water, 5
There is a method in which calcium carbonate is incinerated at 00 to 900 ° C. to obtain calcium carbonate, which is dehydrated and dried to be used as a raw material for fertilizers and cement (see JP-A-4-346882).

[0005]

However, these conventional methods of producing fertilizer in the prior art require large-scale production equipment, a cost of several hundred million yen or more, and a high cost. For this reason, they are not commercially available, and even when fertilized, they are limited to soil amendments at best, and they have poor marketability and are hardly used effectively. Problems for solving such a conventional problem will be described below.

Inexpensive treatment cost Rather than using large-scale and expensive equipment as in the prior art, inexpensive equipment already used in power plants and the like, and waste disposal companies are currently using it. It is necessary to develop equipment that can be used as a fertilizer in a short period of time while combining equipment. In addition, it is necessary to develop a technology that can select a production site with the lowest cost by making a fertilizer production site arbitrary, such as making a processing device such as a process portable.

[0007] On the other hand, in the fermentation treatment step, fermentation by fermentation bacteria contained in fertilizer raw materials such as chicken manure is carried out without using special fermentation bacteria as in the prior art. It is necessary to keep processing costs low so as not to pass on development costs. Further, in the fermentation treatment of shellfish by a special fermentation bacterium, it is necessary to add about 50% of a nutrient such as rice bran as a fermentation bacterium, which is one of the causes, which contributes to an increase in treatment cost.

[0008] There is a concern that the use of fertilizers solely for shellfish is limited to applications such as soil amendments. For example, by mixing with other organic substances, a more beneficial product is produced than a general organic fertilizer, and commercial use is possible. It is necessary to put on.

[0009] The object of the present invention is based on the situation described above,
An object of the present invention is to provide a method for producing an organic fertilizer for easily and at low cost making fertilizer into shellfish such as mussels densely growing in seawater intake channels of various plants such as power plants.

[0010]

In order to achieve the above object, the present invention relates to a method for producing organic fertilizer for attached shellfish such as a condenser cooling water channel, which comprises a method of manufacturing a condenser cooling water channel of a thermal or nuclear power plant. In a method of producing organic fertilizer from shellfish attached to an intake channel, shellfish and other algae such as mussels collected from the plant intake channel, are sorted into shells and shell meat at the site where the plant intake channel is located, After sorting, the mixture is ground, and the shell powder, shell meat and other algae are mixed and fermented to produce an organic fertilizer. For this reason, if shellfish is crushed on site, and further sorting and dewatering processes are performed, the transported amount of the collected shellfish is drastically reduced to one-tenth or less of the originally collected amount, and the cost is remarkably reduced. Moreover, the collected shellfish are rich in organic matter, and can be fermented and effectively used as an organic fertilizer.

In the following, specific means are described. The present invention utilizes the shells and shell meats of mussels mainly attached to condenser cooling water channels of thermal power plants and nuclear power plants, as follows. It is a method of producing organic fertilizer by the combination of equipment and process shown. (A) Step of Sorting Shells and Others Using a Shell Sorting Machine Shells are washed with water and sieved with a shell sorting machine by vibrating or rotating action to sort shells on the upper part of the sieve and shellfish and washing drainage on the lower part of the sieve. When crushing shellfish, a large amount of water is generated, and the shell meat is also crushed and dissolved in the wastewater, resulting in deterioration of the quality of the wastewater. Then, by separating the shell and the shell meat in advance, each can be used as an organic fertilizer raw material. In addition, as for the method of introducing shellfish into the shell sorter, a backphone is used for the vibration type, and vacuum suction is used for the rotary type.

(B) Dehydration step by centrifuge A cation-type and anion-type flocculant is added to the selected shellfish and washing wastewater, and the shellfish is dehydrated by a mobile centrifugal dehydrator. The solids such as shellfish and the like are separated into water and the separated solids are used as fertilizer raw materials. At this time, the amount of the coagulant added is as small as possible to enhance the dewatering effect, so that the dehydrated shellfish and the like do not become viscous. (C) Crushing process by shell crusher The shells selected in the sorting process have a diameter of 5 mm by the crusher.
Grind to the following, and improve the transfer efficiency by reducing the volume and use it as a fertilizer raw material.

(D) Fermentation process using a primary fermenter Fermentation methods for shellfish are roughly classified into aerobic fermentation and anaerobic fermentation. Therefore, a large-scale processing device is required to collect and treat the shellfishes generated in large quantities without exhaustion. Therefore, as an inexpensive treatment method that meets market needs, based on aerobic fermentation,
In order to promote fermentation of crushed shells and dehydrated shell meat, etc., it is mixed with organic fertilizer raw materials such as chicken manure, coffee grounds, and organic sludge while applying pressure to a temperature of 50 to 60 ° C. with a residence time of about 10 minutes. A primary fermentation process is performed to raise the temperature.

(E) Secondary fermentation treatment step in the room The primary fermentation is piled up in the room, and the secondary fermentation is performed while blowing air from below on the floor. At this time, the piled material is appropriately turned back to further promote fermentation and produce the organic fertilizer in a short time. Since the present invention uses an organic fertilizer raw material such as chicken dung also as a fermentation bacterium, there is no need to add a sponge so that the processing cost can be reduced.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a process chart showing one embodiment of the method for producing an organic fertilizer of the present invention. (A) Shellfish removal work in the intake channel First, a vacuum truck is operated to the site where the intake channel is located, and the shellfish such as mussels and algae or sludge which are densely grown in the intake channel are sucked.

(B) Step of sorting shells and other materials On the spot, shells, algae or sludge sucked and crushed by a shell sorting machine connected to a vacuum truck are used to remove shells, shell meat, algae or sludge. And to sort. The following method is appropriately adopted for the selection. (A) Vibratory sorting The shellfish and other things sucked up from the intake channel are put into a shell sorter using a backphone or the like. In the shell sorter, it is washed while showering with water, and at the same time, it is sieved by a vibrating action (opening about 7 mm), and the shell is sorted on the upper part of the screen. And washing and drainage. (B) Rotary sorter Shellfish and other things are sucked from the intake channel by a vacuum car and put into a shell sorter. In the shell sorter, the water is washed while showering water, and at the same time, it is sieved by a rotating action (opening about 7 mm), the shell is sorted on the upper part of the screen, and the shells are separated from the shell below the screen, that is, shell meat and algae.・ Sludge etc. (hereinafter referred to as shellfish etc.) and washing wastewater are sorted out. The shells selected at the upper part of the screen are discharged by a rotary scraper, and the shell meat and the washing water are sucked into the next vacuum car.

(C) Dehydration process by centrifugal separator The centrifuge vehicle used in the dehydration process is a mobile type including a drive unit, a chemical solution unit, a mud supply unit, a dehydration unit, and a drainage unit. The centrifuge vehicle will be operated on site with a water channel. The shell meat other than the shells and the washing wastewater sorted by the sorter are sucked by the suction pump, and the coagulant dissolved in advance is added to the line mixer (mixing stirrer), and the solid matter in the shellfish and washing wastewater is added. The solids are aggregated into large particles, introduced into a basket-type centrifuge, and subjected to centrifugal action by high-speed rotation, so that solids such as shellfish accumulate on the wall surface of the basket. During this time,
The separated water overflows from the upper part of the basket, and is eventually discharged out of the system by the drainage pump. When the solid content in the basket reaches a certain amount, the rotation decreases, and the solid content is scraped down by a scraper, discharged out of the system by a belt conveyor, and becomes a fertilizer raw material. At this time, a coagulating sedimentation agent is added to enhance the dehydration effect, but the amount of addition is minimized,
It is desirable that the dehydrated material does not become clay-like.

(D) Pulverizing step by shell crusher The selected shells are crushed by a crusher comprising a hopper, a screw conveyor, a crusher and a belt conveyor to a size of about 5 mm.
Pulverize to the following to improve the transport efficiency by reducing the volume and use it as a fertilizer raw material. The pulverizing unit converts the shell supplied from the hopper into a steel die having a hole diameter of 10 mm,
Feed between blade cutters with a gap of 3 to 5 mm,
mm or less and discharged out of the system via a belt conveyor from the die hole to obtain a fertilizer raw material.

(E) Fermentation step by primary fermenter The solid content of the crushed shell and dehydrated shellfish is as follows:
It is fed into the primary fermenter together with raw materials for organic fertilizer that promote fermentation of chicken manure, coffee grounds, and organic sludge. The primary fermenter consists of a raw material hopper, screw conveyor, and cylindrical pressure cylinder. The fertilizer raw material supplied from the raw material hopper has a volume of 1, such as crushed shells and dehydrated shellfish,
The organic fertilizer raw materials such as coffee grounds and chicken dung are introduced into a pressurized cylinder by a screw conveyor so as to have a mixing ratio of 3 volumes. Each raw material introduced into the pressurized cylinder spirally moves in about 10 minutes between the rotation of the two rows of deformed blades and the gates installed in the cylinder. At this time, the mixture undergoes high pressure and violent vibration while mixing and moving, so it receives compression friction heat, and the temperature rises rapidly to 50 to 60 ° C. almost without being affected by the outside air, ending the primary fermentation step. . In order to obtain this high pressure and severe vibration, the opening degree of the exit gate is adjusted while observing the state of fertilizer at the exit, and optimum conditions are found. By rapidly increasing the temperature, psychrotrophic and mesophilic bacteria that have an adverse effect on fertilization are killed and thermophilic bacteria are activated, so that germination of thermophilic bacteria in secondary fermentation can be promoted.

(F) Secondary fermentation treatment step in the room The primary fermentation is piled up in the room, and air is blown from the lower part with a blower to promote aerobic fermentation and secondary fermentation. In this secondary fermentation, the temperature of the primary fermentation, which has risen to 50-60 ° C, comes into contact with the atmosphere when moving, and the temperature temporarily decreases. The temperature rises and the removal of water proceeds with fermentation. In this case, the fermentation is promoted by appropriately turning over, and an organic fertilizer can be produced in a short period of time.

(G) Pelletizing step The organic fertilizer after the secondary fermentation is pelletized in order to make it a certain particle size, which is useful for simplifying the fertilizing operation.

<Evaluation of fertilizer in this embodiment> a. Organic fertilizer components Table 1 shows the components of the organic fertilizer in the present embodiment. The organic fertilizer component can be arbitrarily adjusted according to the mixing ratio of shells, shellfish and the like, and general organic fertilizer raw materials for promoting fermentation, and is not limited to the following components. Table 2 is a component analysis table of shellfishes (shells and shell meat) mainly containing mussels collected by suction. Depending on the state of algae such as seaweed and mud and sand mixed by suction work, calcium content is abundant.

[0023]

[Table 1]

[0024]

[Table 2]

B. Young plant test A young plant test was carried out to investigate whether or not the fertilization of the organic fertilizer in the present embodiment impedes germination of Komatsuna and growth after germination, and the degree thereof. as a result,
Germination starts after 3 days, growth after germination is also going well,
During the test growth period, no abnormal growth considered to be a harmful substance was observed.

The method for producing an organic fertilizer according to the present embodiment has low processing cost and wide application. That is,
Rather than using large-scale and expensive equipment as in the prior art, shell sorters already used, mobile centrifuges owned by waste disposal companies, inexpensive primary fermenters,
Depending on the combination of the pelletizer and the waste treatment company, the treatment period is 30 units per unit.
Inexpensive organic fertilizer can be manufactured in a short period of time, such as about a day. Further, it is not necessary to limit the installation place of the equipment for each process to a specific place, and it is a method that can arbitrarily select a place where the processing cost is the lowest.

Further, in the fermentation treatment of shellfish by a special fermenting bacterium, a nutrient such as rice bran is added as a middle species of the fermenting bacterium by about 50%.
Although it is necessary to add and treat to a certain extent, this is one of the causes of an increase in the processing cost.However, in the present embodiment, since an organic fertilizer material such as chicken dung is used also as a fermentation bacterium, it is not necessary to add a medium seed In addition, processing costs can be significantly reduced. From these facts, the results of the trial calculation of the processing cost according to the present embodiment show that, compared with the trial calculation at the thermal power plant of a certain power company,
This can be reduced to about one-half. In addition, it is feared that shellfish alone fertilizers are limited to applications such as soil conditioners, so by mixing with chicken dung, coffee beans grounds, etc., the range of use as organic fertilizers can be widened and put on commercial base Can be.

Next, an example of a vehicle for on-site processing, which is one of the features of the present embodiment, will be described. FIG.
It is a side view of the vehicle carrying the device which performs shell sorting automatically. This vehicle includes a tank 1, a rotary screen 2, a discharge two-stage damper 3, a connection / drain valve 4, a suction valve 5, a connection valve 6, a control panel 7, an operation panel 8, and the like. This vehicle will be transported along with the vacuum truck to a site where there is an intake channel for collecting shellfish.

In the figure, a vacuum wheel (not shown) is connected to the suction valve 5. Shellfish, algae, sludge, etc. sucked and collected by the vacuum truck are crushed by a strong forced suction action and enter the rotary screen 2 of the tank 1 from the suction valve 5. Here, the shells are separated into shellfish and muddy water, and the shells are washed while rotating, pass through the discharge two-stage damper 3, and are discharged from the discharge port. Shell meat and muddy water separated from the shell fall off the rotary screen 2,
It is sucked into the suction wheel connected to the connection / drain valve 4. In this way, work can be efficiently carried out in advance at the site where the intake channel is located, and labor saving in the next transportation process can be achieved.

As described above, according to the above-described embodiment, there is provided a method for producing an organic fertilizer which has solved the drawbacks such as the huge equipment cost, extremely high running cost, and the lack of commercial use as in the prior art. The effects are shown below. a. Inexpensive Apparatus The apparatus provided for the method for producing an organic fertilizer of the present embodiment has a low cost among commercially available ones. b. Inexpensive fermentation method In the conventional technology, special fermentation bacteria are used, and therefore, it is necessary to add technical seeds for the special fermentation bacteria and to add medium seeds such as rice bran as a nutrient, so that the fermentation treatment cost increases. On the other hand, the fermentation bacterium in the present embodiment uses a general organic fertilizer raw material (chicken dung, coffee grounds, and the like), so that the cost is low.

C. Arbitrary treatment place In the conventional technology, a large-scale treatment device is installed in a power plant premises or the like, and fertilizer is made by a dedicated operator. On the other hand, since the shell sorter, the centrifuge, and the crusher in the present embodiment are all portable types, the processing place with the lowest processing cost can be arbitrarily selected. d. Inexpensive treatment cost In the case of fertilizer using the conventional technology, in the case of a fermentation treatment method at a thermal power plant premises of another company, a treatment cost of about 400,000 yen per m ³ is assumed.
Organic fertilizer can be manufactured at a cost of about one-half.

E. Commercial base The organic fertilizer according to the present embodiment can be adjusted to fertilizer components according to the needs of the market, and has an effect of preventing lodging of rice and the like by calcium carbonate which is a shell main component, and is most suitable as a fertilizer. Since the product has a uniform particle size due to the development, it can be put on a commercial base.

[0033]

As described above, according to the method for producing organic fertilizer of the present invention, shellfish such as mussels that grow densely in seawater intake channels of various plants such as power plants can be easily and inexpensively converted into fertilizer. I can do it.

[Brief description of the drawings]

FIG. 1 is a process chart showing one embodiment of a method for producing an organic fertilizer of the present invention.

FIG. 2 is a side view of a vehicle equipped with an apparatus for automatically performing shell sorting according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank 2 Rotary screen 3 Discharge 2-stage damper 4 Connection / drain valve 5 Suction valve 6 Connection valve 7 Control panel 8 Operation panel

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tsuneo Sato 1-11-1 Higashiko, Seirocho, Kitakanbara-gun, Niigata Prefecture Inside the Higashi-Niigata Thermal Power Station, Tohoku Electric Power Co., Inc. 1-Chome 1-1 115 Higashi-Niigata Thermal Power Station Tohoku Electric Power Co., Inc. (72) Inventor Hideo Tsuchida 1-1-1 115 Higashi-ko, Seiro-cho, Kitakanbara-gun, Niigata Prefecture F-term in Higashi-Niigata Thermal Power Station (Reference) 4H061 AA02 CC01 CC04 CC31 CC41 CC51 DD20 EE51 EE61 EE65 EE66 GG13 GG41 GG48 GG49 GG52 GG70

Claims (5)

[Claims] 1. A method of producing organic fertilizer from shellfish attached to a plant intake channel such as a condenser cooling channel of a thermal or nuclear power plant, wherein shellfish such as mussels and other algae collected from the plant intake channel. Is classified into shells and shell meat at the site where the plant water intake is located, crushed, crushed, mixed with these shell powder and shell meat and other algae, and fermented to produce an organic fertilizer. Characteristic method for producing organic fertilizer for attached shellfish such as condenser cooling water channels. 2. A method for producing organic fertilizer from shellfish attached to a plant intake channel such as a condenser cooling channel of a thermal or nuclear power plant, comprising: (1) shellfish such as mussels and other algae from the intake channel; And (2) introducing shellfish etc. sucked and collected by the vacuum device into a vibrating backphone or a shell sorter using a rotary vacuum suction method, and washing with water and vibrating or rotating. (3) adding a coagulating sedimentation agent to the shellfish below the sieve and the washing wastewater, adding a flocculant to the shells above the sieve and the shellfish below the sieve and washing wastewater. (4) crushing the shell above the sieve with a crusher, and the dehydrated shell meat;
A step of introducing the fermentation promoting material into a primary fermenter, mixing under pressure and performing primary fermentation for a predetermined residence time, and (5) a step of blowing air with a blower to the primary fermented to perform secondary fermentation. A method for producing an organic fertilizer of attached shellfish such as a condenser cooling water channel, comprising: 3. A fermentation promoting material such as an organic fertilizer material such as chicken dung, an organic matter such as coffee bean cake and organic sludge, or an aerobic fermentation bacterium is added as a material for promoting the fermentation. Item 3. The method for producing an organic fertilizer according to Item 1 or 2. 4. The method for producing an organic fertilizer according to claim 1, wherein the muddy material collected together with the shellfish and the like is dehydrated and mixed with the algae and the like. 5. A vacuum device for sucking shellfish such as mussels from the intake channel, a shell sorter for sorting shellfish and shellfish, etc., the shellfish collected by suction, a crusher for crushing shells, and a shellfish for sorting shellfish. A dehydration processing machine for dehydrating meat and the like, suitably mounted on a vehicle, operating at a site with an intake channel, and performing each of the suction, sorting, crushing, and dehydrating processes locally. 5. The method for producing an organic fertilizer according to any one of 1 to 4.