How to remove potassium from bamboo

Abstract

To provide a removal method of Kalium in bamboo allowing Kalium in the bamboo to be removed without using a large amount of water.SOLUTION: A removal method of Kalium in bamboo includes a process of compressing bamboo powder and biomass with a water content higher than that of the bamboo powder together, and preferably also includes a process of mixing the bamboo powder and the biomass. More preferably, the water content of the bamboo powder is 40% to 60%, and further preferably, the biomass is of a waste mushroom bed.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a method for removing potassium contained in bamboo. [Background technology]

[0002] Bamboo grows faster than trees and is known to reach a size that can be used in a short period of time. For this reason, bamboo is being considered for industrial use. One example of the industrial use of bamboo is its use as fuel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5753959 Summary of the Invention [Problem to be solved by the invention]

[0004] Bamboo contains a lot of potassium, so the melting point of bamboo ash is lower than that of general wood ash. Because the melting point of bamboo ash is low, when bamboo ash is burned in a boiler like wood, it softens and the ash, called clinker, melts and forms a solid mass. Clinker is not desirable because it inhibits combustion and causes damage to the inner wall of the boiler.

[0005] Therefore, as a method for obtaining bamboo with a reduced potassium content, it has been proposed to soak the bamboo in water to dissolve the potassium into the water and then dehydrate the bamboo (see, for example, Patent Document 1).

[0006] However, the method of Patent Document 1 has the disadvantage that a large amount of water is required to soak the bamboo, and a container larger than the volume of the bamboo and a storage space for the large amount of water are required.

[0007] The object of the present invention is to provide a method for removing potassium contained in bamboo, which can remove the potassium contained in bamboo without using a large amount of water. [Means for solving the problem]

[0008] To achieve the above-mentioned objective, one of the present inventions is a method for removing potassium contained in bamboo, which comprises a step of combining bamboo powder with biomass having a higher moisture content than the bamboo powder and squeezing it together. Effect of the Invention

[0009] According to the present invention, a method for removing potassium contained in bamboo can be provided, which can remove potassium contained in bamboo without using a large amount of water. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (How to remove potassium from bamboo) The method for removing potassium contained in bamboo of the present invention includes a step of combining bamboo powder with biomass having a higher moisture content than the bamboo powder and squeezing it together, and preferably also includes a step of mixing the bamboo powder with the biomass, and may further include other steps as necessary. Combining bamboo powder and biomass can mean, for example, placing the bamboo powder and biomass in the same container as appropriate, layering the bamboo powder in a container and adding biomass powder on top of the bamboo powder layer to form a biomass layer, and repeating this process, thereby stacking layers of bamboo powder and biomass.

[0011] As mentioned above, it has been necessary to use a large amount of water to remove the potassium contained in bamboo (bamboo powder) up until now. In the method using a large amount of water, a place to store the water used is required, and it is very costly. Therefore, the present inventors have investigated a method to remove the potassium contained in bamboo without using a large amount of water. And, the present inventors have focused on biomass with a higher moisture content than bamboo. As a result, they have found that it is possible to remove the potassium contained in bamboo without using a large amount of water by squeezing a combination of bamboo and biomass with a higher moisture content than bamboo, and have completed the present invention.

[0012] <Bamboo powder> Bamboo powder is made by crushing bamboo into a fine powder. The bamboo used for the bamboo powder is not particularly limited and can be appropriately selected depending on the purpose, and examples include Moso bamboo, Madake bamboo, Hachiku bamboo, Kurochiku bamboo, Hotei bamboo, Shihochiku bamboo, Tochiku bamboo, etc. These may be used alone or in combination of two or more types.

[0013] The average particle size of the bamboo powder is not particularly limited and can be appropriately selected depending on the purpose, for example, 30 μm to 1.0 mm, etc. The smaller the average particle size of the bamboo powder, the easier it is to remove potassium.

[0014] The moisture content of the bamboo powder is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 40% to 60%. The moisture content of bamboo powder can be measured by any commonly used method, such as the method specified in JIS M 8812.

[0015] <Biomass> The biomass is not particularly limited as long as it is of biological origin and can be appropriately selected depending on the purpose, and examples thereof include waste mushroom beds, grass clippings, pruning materials, sawdust, food processing residues, etc. These may be used alone or in combination of two or more types.

[0016] <<Waste mushroom beds>> The waste mushroom bed refers to a mushroom bed after inoculating a medium with a mushroom fungus (basidiomycete) and culturing it on the medium, and harvesting the fruiting bodies formed through the spread of mycelium and culture maturation. Specifically, the waste mushroom bed contains a medium for inoculating the mushroom fungus, mushrooms, etc. The medium contains a medium base material, nutrients, additives, and the like. Examples of medium substrates include sawdust, wood chips, rice straw, and corncob meal (corn cobs). Nutritional ingredients include bran, soybean pulp, miso, rice bran, powdered beet, wheat germ, and dried shochu lees. Additives include water, lime (such as hydrated lime), fossil shells, and oyster shells. These may be used alone or in combination of two or more. The ratio of the medium base material, nutrients, and additives may be appropriately changed according to the type of mushroom to be cultivated. As the mushroom, any mushroom (usually an edible mushroom) can be used, and examples thereof include enokitake, oyster mushroom, buna shimeji, spaghetti mushroom, king oyster mushroom, shiitake, nameko, yamabushitake, maitake, slime mushroom, hatakeshimeji, honshimeji, agaric ear mushroom, and usuhiratake.

[0017] The moisture content of the biomass is not particularly limited as long as it is higher than the moisture content of the bamboo powder, and can be appropriately selected depending on the purpose. For example, 60% to 70% is preferable. The moisture content of biomass can be measured by any commonly used method, such as the method specified in JIS M 8812.

[0018] The ratio of bamboo powder to biomass is not particularly limited and can be appropriately selected according to the purpose, but it is preferable that the ratio of biomass is greater than the ratio of bamboo powder. When the ratio of biomass is greater than the ratio of bamboo powder, the potassium contained in the bamboo powder is easily transferred to the moisture contained in the biomass, and the potassium in the bamboo powder is easily removed.

[0019] <Compressing process> The squeezing step is carried out to apply an external force to the bamboo powder and biomass to remove moisture contained in the bamboo powder and biomass. The squeezing step is carried out by a squeezing means. The means for squeezing is not particularly limited and can be appropriately selected depending on the purpose.

[0020] <Mixing process> The mixing step is not particularly limited as long as it is a step that is usually used for mixing powders, and can be appropriately selected depending on the purpose. The device used in the mixing step is not particularly limited as long as it is a device that is usually used for mixing powders, and can be appropriately selected depending on the purpose.

[0021] <Other processes> The other steps are not particularly limited and can be appropriately selected depending on the purpose. For example, there can be a step of placing bamboo powder and the biomass in a container. EXAMPLES

[0022] Examples of the disclosed technology will be described below, but the disclosed technology is in no way limited to these examples.

[0023] Example 1 Waste mushroom bed (moisture content: 61.4%) and bamboo powder (moisture content: 46.1%, bamboo powder produced in Miyazaki Prefecture, manufactured by Kawanaga Bussan Co., Ltd.) were mixed at a mass ratio of 1: 1. The resulting mixture was manually pressed using a press (domestic garlic press Sten Jumbo) and the pressed liquid was removed to obtain the biomass composition of Example 1.

[0024] Example 2 A biomass composition of Example 2 was obtained in the same manner as in Example 1, except that the waste mushroom bed and bamboo powder were mixed in a mass ratio of 2:1.

[0025] Example 3 A biomass composition of Example 3 was obtained in the same manner as in Example 1, except that the waste mushroom bed and bamboo powder were mixed in a mass ratio of 3:1.

[0026] Comparative Example 1 A biomass composition of Comparative Example 1 was obtained in the same manner as in Example 1, except that the mixture with the waste mushroom bed was not performed.

[0027] Comparative Example 2 A biomass composition of Comparative Example 2 was obtained in the same manner as in Example 1, except that pressing was not performed.

[0028] <Measurement of potassium removal amount> The amount of potassium contained in the waste mushroom bed and the bamboo powder used in the examples was measured using an EDX-8000 (manufactured by Shimadzu Corporation). The potassium content in the liquid after squeezing in Examples 1 to 3 was measured using a potassium ion meter (compact potassium ion meter LAQUAtwin <k-11>The measurement was performed using a fluorine-containing ... gas analyzer (manufactured by Horiba Advanced Techno Co., Ltd.). The potassium removal rate (%) was calculated from the obtained potassium content by the following formula. The calculation results are shown in Table 1. Potassium removal rate (%) = [amount of potassium derived from bamboo powder contained in the liquid after squeezing (μg)] / [amount of potassium contained in bamboo powder before squeezing process (μg)] * 100 In addition, in Comparative Examples 1 and 2, potassium could not be removed.

[0029] [Table 1]

[0030] Examples 1 to 3 were able to remove a large amount of bamboo-containing potassium compared to Comparative Example 1, in which no waste mushroom bed was added, and Comparative Example 2, in which no squeezing was performed. Although Examples 1 to 3 did not add water and did not use strong squeezing force, they were able to remove bamboo-containing potassium. Therefore, the results of Examples 1 to 3 revealed that by using bamboo powder and biomass with a higher moisture content than the bamboo powder, it is possible to remove bamboo-containing potassium in a simple manner without requiring a large amount of water. This is thought to be because the potassium contained in the bamboo powder was dissolved in the moisture in the waste mushroom bed, and the dissolved potassium was extracted by squeezing together with the water, allowing it to be removed.

Claims

1. A method for removing potassium contained in bamboo, comprising a step of combining bamboo powder with biomass having a moisture content of 60% to 70% so that the mass ratio of the bamboo powder to the biomass is 1:1 to 1:2, and squeezing the mixture.

2. The method for removing potassium contained in bamboo according to claim 1, further comprising a step of mixing the bamboo powder with the biomass.

3. A method for removing potassium contained in bamboo according to claim 1 or 2, wherein the biomass is a waste mushroom bed.

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