JP4526312B2 - Water purification method using charcoal grains - Google Patents

Description

  The present invention relates to a water purification method for river water and septic tank drainage using charcoal particles.

  While economic development and industrial sophistication have made it possible to live a rich social life, a wide variety of waste is being discharged in large quantities, which has become a major social problem. In addition, effective use of biomass (biological resources) has been proposed from the viewpoint of protecting limited earth resources. This situation is no exception for timber resources. In the mountainous area, “thinning” is carried out to cut some trees in order to promote the growth of trees and protect the health of the forest. In many cases, it was left unattended. Since thinned wood has been positioned as an environmental article under the Green Purchasing Law that took effect in April 2001, thinned wood is being recycled, and the industry is actively working on making thinned wood into chips (wood chips). It is out. However, in addition to the increase in wastes such as timber structures and sawn processing scrap discharged from the construction industry as well as thinned wood, the demand for wood chips itself has been sluggish, which has led to the problem of mass inventory. It is the current situation that is occurring. Thus, attempts have been made to carbonize wood chips, process them into charcoal grains, and use them for water purification.

  Patent Documents 1 to 4 describe examples in which charcoal particles (represented as charcoal pieces, charcoal, wood carbonized chips, and activated carbon, respectively) are used for water purification of rivers and the like. According to these inventions, it becomes possible to purify the water quality of rivers and the like by the adsorption action of charcoal particles, and a relatively large number of wood chips can be processed into charcoal particles and used effectively. However, some used charcoal grains (adsorbed charcoal grains) that have been used in water purification equipment and adsorbed pollutants such as rivers are partly reheated and reused as soil conditioners. The problem of large-scale inventory has been occurring, and there has been a strong demand for reuse and effective use.

JP 2001-140240 A JP 2000-317480 A JP 09-327690 A JP 08-144237 A

  An object of the present invention is to provide a water quality purification method using charcoal particles that effectively uses again the used charcoal particles adsorbing pollutants such as rivers while utilizing the charcoal particle adsorption effect.

  In order to solve the above-mentioned problems, a process for producing lightweight porous charcoal particles obtained by low-temperature carbonization firing of wood chips made from waste wood such as construction-generated wood, sawdust, thinned wood, etc. A process of purifying water quality by storing a charcoal grain cassette filled with porous charcoal grains in a container and placing it in a flow path such as river water or septic tank drainage (water purification process 1), water quality in the water purification process 1 It consists of a manufacturing process of regenerated charcoal grains that are purified, deodorized, decolorized and regenerated at a high temperature to absorb the light porous charcoal grains that have been adsorbed to activate hard charcoal particles or activated charcoal to activate them. The regenerated charcoal granules obtained in step 1 are reduced to the charcoal grain cassette of the water quality purification process, and the water quality purification process (water quality purification process 2) is circulated alone or together with the lightweight porous charcoal grains. The water purification method was adopted. In addition, lightweight porous charcoal particles obtained by low-temperature carbonization firing of wood chips made from wood waste (construction-generated wood) discharged from the construction industry, waste wood such as sawdust, thinned wood, etc. Manufacturing process, a process of purifying water quality by storing the charcoal grain cassette packed with the light weight porous charcoal grains in a container and arranging it in a flow path such as river water and septic tank drainage (water purification process 1), Water quality purification process 1, water quality purification, deodorization, and decolorization operations are performed to regenerate the adsorbed lightweight porous charcoal particles at a high temperature to produce hard charcoal particles or activated charcoal to produce activated charcoal, and the regenerated charcoal In the water purification process 2, the regenerated charcoal particles obtained in the grain production process are reduced to the charcoal grain cassette of the water purification process to purify the water alone or together with the lightweight porous charcoal grains (water purification process 2). Recycled charcoal with preferential adsorption of heavy metals For the regenerated charcoal grains preferentially adsorbing other than heavy metals in the water purification process 2 is regenerated at a high temperature and regenerated as fresh charcoal grains to the charcoal grain cassette in the water purification process 2 The water purification method is characterized by repeating the water purification process (water purification process 3) alone or together with the lightweight porous charcoal grains to circulate the charcoal grains for water purification.

  By comprising the manufacturing process of the lightweight porous charcoal grain obtained by carrying out low-temperature carbonization baking of the wood chip which made wood waste material into a chip | tip, a wood chip can be processed into a lightweight porous charcoal grain, and can be used effectively. In addition, it consists of a process (water purification process 1) in which a charcoal grain cassette packed with lightweight porous charcoal grains is stored in a container and placed in a flow path such as river water or septic tank drainage to purify water quality. In addition to the water purification method utilizing the charcoal grain adsorption effect, the water quality purification method is easy to replace the adsorbed light-weight porous charcoal grains and has excellent maintainability. Furthermore, water purification, deodorization, and decolorization operations are performed in the water purification process 1 to regenerate the adsorbed lightweight porous charcoal particles at a high temperature to activate hard charcoal particles or to activate them to obtain activated charcoal. As a result, the lightweight porous charcoal particles adsorbing the contaminants can be regenerated. In addition, the recycled charcoal grain is reduced to the water quality purification process charcoal grain cassette and consists of a process of purifying water alone or together with lightweight porous charcoal grains (water quality purification process 2). Charcoal grains can be used effectively. In addition, volume shrinkage occurs when the adsorbed lightweight porous charcoal grains are regenerated at high temperature, so that more adsorbed lightweight porous charcoal grains are reduced to the charcoal cassette of the water purification process as recycled charcoal grains. The used lightweight porous charcoal particles adsorbing contaminants can be used more effectively. As much as the volume shrinkage occurs, a new lightweight porous charcoal grain can be added to perform water purification along with the lightweight porous charcoal grain. The adsorbed lightweight porous charcoal granules are regenerated charcoal grains whose internal space structure is suitable for heavy metal adsorption by heat treatment in a high-temperature reducing atmosphere at 900 to 1200 ° C. In the water purification process containing heavy metals, A method of using and removing heavy metals by adsorption becomes efficient. The regenerated charcoal grains preferentially adsorbing heavy metals are subjected to a firing treatment together with the adsorbed heavy metals in a high-temperature oxidizing atmosphere of 1200 to 1400 ° C. The regenerated charcoal grains preferentially adsorbing other than heavy metals in the water purification process 2 are regenerated at a high temperature and regenerated as fresh charcoal grains to the charcoal grain cassette in the water purification process 2 so that the water quality can be obtained alone or together with the lightweight porous charcoal grains. By repeating the purification process (water quality purification process 3) and refining the water quality by circulating the charcoal grains, the charcoal grains can be used more effectively. In this specification, “preferentially adsorbing heavy metals” means a state in which mainly heavy metals (mercury, chromium, nickel, cobalt, etc.) are adsorbed.

  At this time, the lightweight porous charcoal grains may be a water purification method using charcoal grains produced by heat-treating wastes such as construction-generated wood, lumber processing scraps or wood structures in a reducing atmosphere at 400 to 900 ° C. it can. As for charcoal adsorption, when it is heated at a relatively low temperature (400 to 900 ° C.), it easily adsorbs ammonia nitrogen and nitrite nitrogen, and when heated at a relatively high temperature (900 ° C. or higher), mercury. It is known to exhibit a certain adsorptivity to heavy metals such as cadmium. That is, it becomes the water purification method which was excellent in the adsorptivity of ammonia nitrogen and nitrite nitrogen which are the main pollutants of a river by heat-processing at 400-900 degreeC.

  The water quality purification process may be a water quality purification method using charcoal grains in which a charcoal grain cassette filled with lightweight porous charcoal grains is stored in a specific concrete wall and placed in a channel of river water to purify the water quality. preferable. By storing the charcoal grain cassette in a specific concrete fence and installing it on the riverbed or the like, the charcoal grain cassette is less likely to be washed away even when the water flow is intense, such as when the river water increases.

  The water quality purification process uses a charcoal grain that purifies the water quality by storing a charcoal grain cassette filled with lightweight porous charcoal grains in a tub in a specific container and placing it in the flow path of the septic tank drainage so as to accept the wastewater from the septic tank. A purification method is also preferred. Thereby, the waste water from the septic tank can be further purified by the water quality purification method using charcoal grains, and the purified waste water can be directly introduced into the tap water.

  The regenerated charcoal grain is also preferably a water purification method using charcoal grains produced by heat-treating adsorbed lightweight porous charcoal grains in a reducing atmosphere at 900 to 1200 ° C. Thereby, it becomes a regenerated charcoal grain having an internal space structure suitable for adsorption of heavy metals such as mercury and cadmium. As described above, the adsorbed lightweight porous charcoal particles become regenerated charcoal particles whose internal space structure is suitable for heavy metal adsorption by heat treatment in a high-temperature reducing atmosphere at 900 to 1200 ° C.

  The water purification process consists of storing a plurality of charcoal grain cassettes filled with lightweight porous charcoal grains in a container and placing them in a flow path such as river water or septic tank drainage. Water purification process 2 and water purification process 3 is a regenerated charcoal grain and a regenerated charcoal grain reduced to a part of the charcoal grain cassette alone or together with a lightweight porous charcoal grain among the plurality of charcoal grain cassettes, and the remaining charcoal grain charged with the lightweight porous charcoal grain It is also preferable to use a method for purifying water using charcoal particles, characterized in that it is set in a container together with a cassette and water purification is performed with lightweight porous charcoal particles.

  The water purification process consists of storing a plurality of charcoal grain cassettes filled with lightweight porous charcoal granules in a container and placing them in a flow path such as river water or septic tank drainage. Exchange work of adsorbed lightweight porous charcoal grains etc. becomes easier. Moreover, even if it says with water quality purification, there are various pollutants, such as ammonia nitrogen, heavy metals such as mercury and cadmium, and a water quality purification method for rivers and the like for removing these various pollutants has been desired. Therefore, the water purification process 2 and the water purification process 3 reduce the regenerated charcoal grains and the regenerated charcoal grains to a part of the plurality of charcoal grain cassettes individually or together with the lightweight porous charcoal grains, thereby reducing the weight of the porous charcoal grains. In addition to ammonia nitrogen and nitrite nitrogen, which are the main pollutants in rivers, water purification is carried out with lightweight porous charcoal grains by setting them in a container together with the remaining charcoal grain cassettes containing only charcoal grains. Therefore, it is a water purification method with high purification efficiency suitable for adsorption of heavy metals such as mercury and cadmium. Furthermore, when regenerated charcoal grains or regenerated charcoal grains are reduced to a cassette as a single unit, the contents (lightweight porous charcoal grains or regenerated charcoal grains) can be distinguished in units of charcoal grain cassettes, so that the adsorbed lightweight porous charcoal grains It is easy to separate and collect the adsorbed regenerated charcoal particles. For example, when only the adsorbed lightweight porous charcoal particles are treated at high temperature to obtain regenerated charcoal particles, the regenerated charcoal particles preferentially adsorbing heavy metals are removed. Water quality with good workability during collection of adsorbed lightweight porous charcoal particles, regenerated charcoal particles, and regenerated charcoal particles during high-temperature firing treatment and when regenerated charcoal particles preferentially adsorbing other than heavy metals at high temperatures It becomes a purification method.

  The high-temperature firing treatment is preferably a water purification method using charcoal grains characterized by firing the regenerated charcoal grains preferentially adsorbing heavy metals together with heavy metals in a high-temperature oxidizing atmosphere of 1200 to 1400 ° C. The regenerated charcoal grains preferentially adsorbing heavy metals are separated into gasified heavy metals and ash by the high-temperature firing treatment, and the ash is dispersed in the forest as a soil conditioner.

  The water purification method using charcoal particles of the present invention can be used effectively by circulating used charcoal particles adsorbing pollutants such as rivers as recycled charcoal particles or regenerated charcoal particles while utilizing the charcoal adsorption effect. It is.

  Hereinafter, the water purification method using the charcoal particles of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing an example of the flow of woody biomass, and FIG. 2 is a schematic diagram for explaining a water purification method using charcoal grains according to the present invention. FIG. 3 is a perspective view showing a state in which charcoal particles are put into the straw used in the first example of the embodiment of the water purification method of the present invention, and FIG. 4 is a first example of the embodiment of the water purification method of the present invention. 5 is an exploded perspective view of the water purification unit used in FIG. 5, FIG. 5 is an external perspective view of the water purification unit used in the first example of the embodiment of the water purification method of the present invention, and FIG. 6 is the first embodiment of the water purification method of the present invention. FIG. 7 is an exploded perspective view of another example of the water purification unit used in one example, and FIG. 7 is a perspective view in which the water purification unit of FIG. 5 is installed in a river. FIG. 8 is a front view showing a state in which the water purification unit used in the second example of the embodiment of the water purification method of the present invention is installed in the flow path of the combined septic tank drainage. In the present specification, the “water purification unit” is a container in which a charcoal grain cassette filled with charcoal grains is stored in a container. For convenience of explanation, the bank in front of the river is omitted in FIG. 7, and the state in which the exterior part in front of the water purification unit is removed in FIG. 8 is assumed.

  First, an example of the flow of woody biomass will be described with reference to FIG. Thinned wood left in the forest is processed into wood chips by a crusher. This wood chip is carbonized by the carbonization device to become charcoal particles, and is used in the water purification unit of the water purification device. A part of the adsorbed charcoal particles adsorbing impurities in the water purification unit is again heat-treated in a carbonization device and dispersed in a forest or the like as a soil conditioner. The tree grows in the forest where the soil conditioner is spread, and the thinned wood is discharged again. As described above, this cycle has a problem of inventory of adsorbed charcoal grains, and its effective use is a problem. Therefore, as shown in FIG. 2, the water purification method using charcoal grains according to the present invention is a low-temperature carbonization firing of wood chips by a carbonization device to form lightweight porous charcoal granules, which are put into a charcoal grain cassette and purified by the water purification apparatus. Used for units. Thereafter, the adsorbed lightweight porous charcoal particles are regenerated at a high temperature by a carbonization device to be regenerated charcoal particles, which are reduced to a charcoal particle cassette of the water purification unit, and the regenerated charcoal particles preferentially adsorbing heavy metals are subjected to a high temperature firing treatment. The regenerated charcoal particles preferentially adsorbing impurities other than heavy metals are regenerated again at a high temperature in a carbonization device to be regenerated charcoal particles.

  In the water purification method using charcoal grains according to the present invention, the firing temperature at the time of low-temperature carbonization firing of wood chips is preferably 400 to 900 ° C. By performing heat treatment at 400 to 900 ° C., it becomes a water purification method that is excellent in adsorbability of ammonia nitrogen and nitrite nitrogen, which are major pollutants in rivers. Moreover, it can fully carbonize in a comparatively short time as it is 400 degreeC or more. When the temperature is 900 ° C. or lower, carbonization can be performed in a relatively short time with an appropriate amount of energy. The firing temperature is more preferably 500 to 800 ° C. Carbonization firing is performed in a reducing atmosphere.

  As shown in FIG. 3, lightweight porous charcoal particles 11 obtained by low-temperature carbonization firing are put into a firewood 120. A large number of water passage holes 121 are formed in the dredging 120, and when the water purification unit 1 (see FIG. 4) containing the charcoal grain cassette 12 is installed on the riverbed, many of the lightweight porous charcoal grains 11 It is configured to improve the water purification effect by spreading water. Resin or metal can be used as the material of the ridge 120, but an inexpensive and lightweight resin is preferable in consideration of price and workability. The amount of charcoal grains 11 to be fed into the dredging 120 is arbitrary, but considering the purification efficiency of rivers and the like, it is preferable to throw the full amount of dredging 120. After the charcoal grain 11 is put into the firewood 120, the water-permeable lid 13 is placed on the charcoal grain 11. As the water-permeable lid 13, for example, a sponge or the like can be used. Although the water-permeable lid 13 does not need to be placed, in order to avoid the outflow of the charcoal particles 11 from the water-flow hole 151 (described later) when the water purification unit 1 is installed in a deep river having a strong flow, etc. It is preferable to provide it.

  As shown in FIG. 4, in this embodiment, four charcoal grain cassettes 12 into which lightweight porous charcoal grains 11 are put are prepared. A water-permeable lid 13 is placed on each charcoal grain cassette 12. Then, after placing the charcoal grain cassettes 12 in which the water-permeable lids 13 are placed in two horizontal rows on the concrete wall (container) 14 in two layers, the concrete lid 15 is put on the lid. . The concrete lid 15 may not be provided when the water purification unit 1 is installed in a shallow river or the like. This is because there is a low possibility that the lightweight porous charcoal particles 11 will flow into the river. However, it is preferable to cover with a concrete cover 15 even if it is a shallow river or the like in consideration of water increase. The concrete wall 14 is provided with an opening 142 on the side surface in order to increase water permeability. In this embodiment, a concrete cage and lid are used, but the present invention is not limited to this. For example, a resin or metal may be used as long as the weight does not allow it to flow into a river. However, in consideration of cost, durability, and difficulty in flowing in a river, concrete is preferable as in this embodiment. Water passage holes 141 and 151 are provided in the bottom of the concrete ridge 14 and the concrete lid 15 so that the water of many rivers is spread by the charcoal grains 11 in the charcoal grain cassette 12. The concrete lid 15 is fixed to the concrete wall 14 to complete the water purification unit 1 (FIG. 5).

  In the present embodiment, the number of the charcoal grain cassettes 12 is four, but is not limited to this. As shown in FIG. 6, the charcoal grain cassettes 12 having a size that occupies the space inside the concrete fence 14 are provided. Only one may be used. However, considering the workability when removing the adsorbed lightweight porous charcoal grain 11 from the charcoal grain cassette 12 and reducing the recycled charcoal grain 111 to the charcoal grain cassette 12, there should be a plurality of charcoal grain cassettes 12. Is preferred. In consideration of safety, these operations are preferably carried out on the river bank after transporting the adsorbed lightweight porous charcoal grain 11 together with the charcoal grain cassette 12 to the river bank. However, when the number of charcoal grain cassettes is one, the weight increases, so that a great deal of labor is required when taking out the charcoal grain cassettes from the concrete fence 14 and moving them to the shore. That is, a large number of people must enter the river and move the charcoal grain cassette 12 to the shore, or in some cases, move the concrete fence 14 together with the crane to the shore. However, as shown in FIG. 4, when there are a plurality of charcoal grain cassettes 12, each one becomes lighter. Therefore, a small number of people, or in some cases, one person directly attaches the charcoal grain cassette from the concrete fence 14. It can be taken out one by one and moved to the shore, and it is a water purification method that does not require a crane or the like and has superior workability. As will be described later, when the recycled charcoal grain 111 and the lightweight porous charcoal grain 11 are mixed and put into the charcoal grain cassette 12, the adsorption is performed from there for the purpose of high-temperature regeneration in the carbonizer. It takes a lot of labor to separate and take out only the light and porous charcoal particles 11. However, by providing a plurality of charcoal grain cassettes 12 and separately charging the lightweight porous charcoal grains 11 and the recycled charcoal grains 111 for each charcoal grain cassette 12, the adsorbed lightweight porous charcoal grains 11 or the regenerated charcoal Only the grains 111 can be instantaneously taken out from the concrete fence 14, which further improves workability. The color of the firewood 120 may be changed between the charcoal grain cassette 12 into which the recycled charcoal grain 111 is introduced and the charcoal grain cassette 12 into which the lightweight porous charcoal grain 11 is introduced. As a result, it becomes obvious at a glance which charcoal grain cassette 12 is loaded with charcoal grains, and the workability is further improved. Furthermore, when the light porous charcoal grain 11 and the regenerated charcoal grain 111 are used in combination, the charcoal grain cassette 12 and the charcoal grain 11 into which the regenerated charcoal grain 111 has been thrown in depending on the river pollution situation, as described later. Considering that the purification efficiency can be improved by changing the number of the charcoal grain cassettes 12, it is still preferable that the water purification unit 1 is composed of a plurality of charcoal grain cassettes.

  More preferably, the number of charcoal grain cassettes is 2-6. If the number is six or less, the volume occupied by the main body of the firewood 120 in the water purification unit 1 is reduced, so that many charcoal particles 11 can be provided in the water purification unit 1 and the water purification efficiency is improved. The number of charcoal grain cassettes is most preferably four. If the number is 4, the ratio of lightweight porous charcoal grains 11 and regenerated charcoal grains 111 can be finely changed (by approximately 25%) and easily changed according to the pollution situation of rivers, etc., and water purification efficiency is easily improved. can do. Moreover, many charcoal grain can be provided in the inside of the water purification unit 1, and water purification efficiency improves more.

  FIG. 7 shows a state in which the water purification unit 1 is installed on the river bed of the river 2. A total of nine water purification units 1 with three rows in the width direction of the river 2 and three stages in the water flow direction are installed. Two futon baskets 21 are installed in two stages on the upstream of the water purification unit 1. For example, the futon basket 21 can be configured such that rubble is wrapped with a reticulated iron wire, and relatively large garbage such as weeds is captured so that they do not enter the water purification unit 1. The bottom of the water purification unit 1 is laid with gravel 22 so that the purified water can easily penetrate into the underground through the water passage hole 141 (see FIG. 4) of the concrete cage 14. The reason why the water purification unit 1 is installed in three stages with steps in the direction of water flow is to increase the purification efficiency.

  In this way, the lightweight porous charcoal particles 11 in the water purification unit 1 that have been used for purification of the river 2 or the like and have been adsorbed with impurities can be taken out from the water purification unit 1 for each charcoal particle cassette 12. The taken-out charcoal particles 11 that have been taken out are regenerated at a high temperature in a carbonization device to become regenerated charcoal particles 111. The treatment temperature is preferably 900 to 1200 ° C. Thereby, it becomes the reproduction | regeneration charcoal grain which has an internal structure suitable for adsorption | suction of heavy metals, such as mercury and cadmium. Moreover, the adsorbed impurity can be decomposed | disassembled enough that it is 900 degreeC or more. When the temperature is 1200 ° C. or lower, the regenerated charcoal particles after the high-temperature treatment are not brittle, and the adsorbed impurities can be decomposed in a short time with an appropriate amount of energy. The treatment temperature is more preferably 1000 to 1100 ° C. Moreover, it is good also as activated carbon by an activation process.

  As shown in FIG. 4, the recycled charcoal grain 111 is put into a firewood 120 to form a charcoal grain cassette 12, and after placing four charcoal grain cassettes 12 covered with a water-permeable lid 13 on a concrete firewood 14, a concrete lid 15 Cover with. At this time, the regenerated charcoal grains 111 may be put into all four firewoods 120, but the regenerated charcoal grains 111 are put into only some of the firewoods 120, and the wood chips are low-temperature carbonized in the remaining firewoods 120. It is preferable to introduce lightweight porous charcoal particles 11 obtained by firing. Also, depending on the pollution situation of the river 2, the number of charcoal grain cassettes 12 into which the regenerated charcoal grains 111 are introduced and the number of charcoal grain cassettes 12 into which the lightweight porous charcoal grains 11 are introduced can be changed to improve the purification effect. More preferred. For example, in a polluted urban river 2, three charcoal grain cassettes 12 containing recycled charcoal grains 111 suitable for the adsorption of heavy metals such as mercury and cadmium, and a lightweight porous material with excellent adsorbability such as ammonia nitrogen One charcoal grain cassette 12 into which the charcoal grain 11 is put can be installed in the water purification unit 1. When all of the adsorbed lightweight porous charcoal grains 11 in the four charcoal grain cassettes 12 are regenerated at a high temperature, the volume shrinks to a regenerated charcoal grain 111 that satisfies the three soots 120. Therefore, one charcoal grain cassette 12 into which the porous charcoal grain 11 is introduced may be added to the three charcoal grain cassettes 12 into which the regenerated charcoal grain 111 is introduced, and installed in the water purification unit 1.

  In the present embodiment, the number of charcoal grain cassettes 12 is four. However, as described above, the number of charcoal grain cassettes 12 is not limited to this and occupies the space inside the concrete fence 14. Good (see FIG. 6). In that case, the recycled charcoal particles 111 and the lightweight porous charcoal particles 11 are mixed and introduced into the charcoal particle cassette 12. However, as described above, it is preferable that a plurality of charcoal grain cassettes 12 are provided and the lightweight porous charcoal grains 11 and the regenerated charcoal grains 111 are separately charged for each charcoal grain cassette. The regenerated charcoal grains preferentially adsorbing heavy metals are baked together with the heavy metals adsorbed in a high-temperature oxidizing atmosphere of 1200 to 1400 ° C., and the obtained ash is dispersed in the forest as a soil improvement material. Regenerated charcoal particles 111 that absorb and preferentially adsorb impurities other than heavy metals are regenerated again at a high temperature in a carbonization device to be regenerated charcoal particles (re-generated charcoal particles), and then reduced again to a charcoal particle cassette in the water purification process. Water purification is repeated with porous charcoal grains.

  FIG. 8 shows a second example of the embodiment of the water purification method of the present invention. In this embodiment, a water purifier (water purification unit) 4 is connected to the drain outlet 31 of the merged septic tank 3, and the water purifier 4 is installed in the drainage flow path of the merged septic tank 3. A shower pipe 42 is attached to the drain outlet 31 along the inside of the water purifier exterior (container) 41 so as not to obstruct the loading and unloading of the charcoal grain cassette 45. The interior of the water purifier 4 is composed of a first space 401, a second space 402, a third space 403, and a fourth space 404, and a water passage hole 44 is provided below them. In each of these four spaces 401, 402, 403, and 404, firewood 450 loaded with lightweight porous charcoal particles 11 obtained by low-temperature carbonization firing of wood chips is placed in two stages.籠 450 is made of punching metal.

  The drainage from the drainage port 31 of the merged septic tank 3 pours onto the charcoal grain cassette 45 installed in the first space 401 from the shower pipe 42 provided in the first space 401. The drainage poured from the shower pipe 42 is purified by passing through two charcoal grain cassettes 45 installed in the first space 401, and further, the second space 402, the third space 403, and the fourth space 404. By sequentially passing through the charcoal grain cassettes 45 respectively provided in the water, it is further purified and drained from the purification drainage port 43.

  Also in the present embodiment, the adsorbed charcoal particles 11 that have been subjected to water purification are treated at a high temperature at 900 to 1200 ° C. to form regenerated charcoal particles 111, and are again put into the firewood 450 (reduced to the charcoal particle cassette 45). ) Purify wastewater. Recycled charcoal particles 111 may be introduced into only one of the upper and lower ridges 450, and lightweight porous charcoal particles 11 obtained by low-temperature carbonization firing of wood chips may be introduced into the other one. In the present embodiment, there are eight charcoal grain cassettes 45, but the present invention is not limited to this, and for example, one may be used. However, by providing a plurality of charcoal grain cassettes 45 and separately charging the lightweight porous charcoal grains 11 and the regenerated charcoal grains 111 for each charcoal grain cassette 45, the adsorbed lightweight porous charcoal grains 11 or the regenerated charcoal Only the grains 111 can be instantaneously taken out from the water purifier exterior (container) 41, and workability is further improved.

It is a schematic diagram which shows an example of the flow of woody biomass. It is a schematic diagram for demonstrating the water purification method using charcoal grain of this invention. It is the perspective view which showed a mode that charcoal grain was thrown into the straw used in the 1st example of the embodiment of the water quality purification method of this invention. It is a disassembled perspective view of the water purification unit used in the 1st example of the embodiment of the water purification method of the present invention. It is an external appearance perspective view of the water purification unit used by the 1st example of the embodiment of the water quality purification method of the present invention. It is a disassembled perspective view of another example of the water purification unit used by the 1st example of the embodiment of the water quality purification method of this invention. It is the perspective view which installed the water purification unit of FIG. 5 in the river. It is a front view which shows the state which installed the water purifying unit used in the 2nd example of the embodiment of the water quality purification method of this invention in the flow path of merged septic tank drainage.

Explanation of symbols

1 Water purification unit
11 Lightweight porous charcoal grains
111 Recycled charcoal grains
12,45 Charcoal grain cassette
120,450 籠
13 Water-permeable lid
14 Concrete fence (container)
142 opening
15 Concrete lid
151 Water vent 2 River 3 Merged septic tank
31 Drain port 4 Water purifier (water purification unit)
41 Water purifier exterior (container)
44 Water vent

Claims (3)

A process for producing lightweight porous charcoal particles obtained by low-temperature carbonization firing of wood chips obtained by converting wood chips made from waste materials such as construction-generated wood, sawdust, or thinned wood into chips at a low temperature of 400 to 900 ° C. , In the process of purifying water quality by storing a charcoal grain cassette filled with lightweight porous charcoal grains in a container and placing it in a flow path such as river water or septic tank drainage (water purification process 1), It consists of a process for producing hard charcoal particles or activated charcoal particles activated by regenerating the adsorbed lightweight porous charcoal particles at a high temperature of 900 to 1200 ° C. by performing water purification, deodorization and decolorization operations, The regenerated charcoal granules obtained in the production process of the regenerated charcoal grains are reduced to the charcoal grain cassette of the water quality purification process, and the water quality purification process (water quality purification process 2) is circulated alone or together with the lightweight porous charcoal grains. Charcoal grains that are characteristic Water purification how. In the water purification process, a charcoal grain cassette filled with lightweight porous charcoal grains or regenerated charcoal grains is stored in a concrete fence that has an opening to allow water to flow, and is placed in the channel of river water to improve the water quality. The water quality purification method by charcoal grain of Claim 1 to purify. 2. The water quality purification step purifies the water quality by storing a charcoal grain cassette filled with light porous charcoal grains or regenerated charcoal grains in a basket in a container for storing septic tank drainage and arranging the cassette in a flow path of the septic tank drainage. Water purification method using charcoal grains.

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