TW505531B - Filter sand washing method and system therefore - Google Patents

Abstract

The present invention disclose a filter sand washing method and the system thereof, wherein a prescribed quantity of filter sand 5 is sucked from a rapid filter bed 1 by a pump 2 at the time of back flow washing the rapid filter bed 1 that performs purification of water by the filter sand. The sucked filter sand 5 is supplied to a sand washing device 3 to remove dirt of the filter sand by the sand washing device 3. The dirt-removed filter sand 6 is stocked in a washed sand stock vessel 4. The stocked filter sand 7 is returned to the rapid filter bed 1 at the time of the back flow washing the rapid filter bed 1. The filter sand in the rapid filter bed 1 is automatically washed by repeating the sucking, washing and returning process in this way. Thus, the interval of regenerating work of a filtration pond can be remarkably prolonged by regenerating cleaning function of sand by a method except the washing method such as surface washing, back washing

Description

505531 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 V. Description of the invention (1) Field of the invention The present invention relates to a method and a system for cleaning filter sand of a filter tank for water purification, and a detailed description thereof Washing method and system for taking out a part of rubbing sand that has passed quickly through the pond and washing it. Background of the invention The water purification treatment system in the water purification plant injects medicines into the raw water introduced from rivers and lakes, so that the floating matter in the raw water becomes a block that sinks easily and sinks into the hall. At this point, the fine suspended matter is further removed through the sand (filtration sand) layer, and the filtered water is disinfected with chlorine gas. The rapid filter is generally used to periodically clean the filter material every 24 to 72 hours. The washing methods include: slap the surface of the sand layer sprayed from the nozzle to clean the surface, and press the clean water into the filter tank from the lower pressure chamber to float the sand, so that the sand and the sand are mixed with each other to make dirt Wash off the countercurrent. The filter sand used for water treatment, even if the surface washing and countercurrent washing are performed regularly, dirt (turbidity such as cold mud) will adhere to the surface after long-term use. If the particle size of the filtered sand is enlarged through the adhesion of turbidity, the voids between the filtered sand may decrease, or the phenomenon of plugging may be caused by the peeling of the adsorbed substance of the filtered sand or the leakage due to the peeling of the sludge Leak). Although this is countered by increasing countercurrent washing, if the countercurrent washing is repeated repeatedly throughout the year, the water pressure will affect the gravel layer that supports the filtered sand. Some of the gravel layer that should have been horizontally laid became thick and thin. The phenomenon is uneven. After the unevenness is formed, the thick part of the gravel layer becomes thinner, and the part will be insufficiently filtered, which will reduce the original filtering function and prevent the normal operation of the filter tank. It will not supply safe water. -4- This paper size applies to Chinese National Standard (CNS) A4 specifications (210 X 297 mm) C Please read the precautions on the back before filling this page) ▼ Install -------- Order ----丄 5. Description of the invention (Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs to restore the filtering function of the positive filter, the operation of the filter tank must be temporarily stopped, the filter material should be removed, and the removed filter material should be washed and screened. It is necessary for the reinstatement worker to lay the cleaned filter material back to the filtration tank after 4 points inspection and repair in the grave filter. However, this reinstatement project requires a huge cost, and the operation of the filtration tank must be stopped during the rehabilitation period. The required period is related to the low efficiency of water purification, so it is expected that the period of the rehabilitation project should be extended as much as possible. In addition, the filter sand re-paved during the rehabilitation project, and the use of fresh sand, the sand used is realistic. It has been recognized as only 20% of filter sand, and there are strict standards for filter materials. In addition, the use of fresh sand is related to the increase in cost. Therefore, the filter sand is washed through It can be reused. The inventors of this application have used epoch-making methods such as the rubbing method to make the washing turbidity below 30 degrees, which is close to the state of fresh sand, and a reusable sand washing device has been announced in Japan. Japanese Unexamined Patent Publication No. 10_100951 and Japanese Unexamined Patent Publication No. Hei. He uses this device to re-lay the filter tank during the renewal process. Purification function. However, in recent years, river water, lakes, and seawater have been polluted by urban drainage, industrial drainage, and agricultural drainage, or the nitrogen acid and sulfates of atmospheric pollutants have been dissolved into the acid rain and water is used to make tap water. The raw water is rapidly deteriorating. Due to the deterioration of the raw water like this, the state of the filter sand has progressed as shown in Table 丨. The filter pond that can be used for a long time in the past 10 to 10 years under normal operation has been regenerated. The pace of the project also has to be accelerated. (Please read the precautions on the back before filling this page)

This paper size applies to Chinese National Standard (CNS) A4 specifications (210 X 297 printed by the Intellectual Property Bureau of the Ministry of Economic Affairs, printed by employee consumer cooperatives 505531 A7 _B7 V. Description of the invention (3) [Table 1] Impurity (degree) After washing Weight (g) Dry weight of attached matter (mg) (mg / g) Hydrochloric acid solubility (%) Washing turbidity (degree) A pond Showa 60,340 48.96 1,150 23.963 1.60 172 Heisei 6,830 48.03 2,260 47.054 3.40 394 Bike Showa 61,940 3,940 49.29 658 13.350 2.10 140 Heisei 6,340 48.59 1,320 27.166 2.80 320 Cike Showa 62,760 4,760 48.67 839 17.238 2.20 169 Heisei 8,380 48.57 1,948 40.107 2.40 560 In addition, it was implemented in Kochiike> Concerning the maintenance of sand 'There are some who judge the time of the rehabilitation project based on all the uneven measurement or particle size survey. The maintenance of the sand to restore the original purification function after the rehabilitation project is limited to surface cleaning and counter-current washing. The clean sand cleaning project is carried out regularly. In addition, the tentative countermeasures for Critosporidium (a protozoan immortal) formulated by the Ministry of Health, Welfare, and Japan in 1996 are provided at the exit of the filter pond. The turbidity is maintained below 0.1 degree. The water purification plant responds to the above-mentioned frequency of surface washing and countercurrent washing. However, the amount of water available during this time decreases, and the purification efficiency deteriorates. In addition, fine sand flows out during washing. Increasing the frequency of counter-current cleaning makes the formation of unevenness earlier, and the time required to produce the rehabilitation project needs to be earlier. Therefore, it is necessary to consider that the conventional countermeasures of only surface cleaning and counter-current cleaning have their limits. The present invention has In view of the above circumstances, a device and method are provided, the purpose of which is to prevent the filter pool from surface stagnation and counter-current washing without stopping the operation. -6-This paper standard applies to China National Standard (CNS) A4 (210 X 297 mm) ----------- Installation -------- Order --------- (Please read the precautions on the back before filling this page) 505531 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. 5. Description of the invention (Wang Fa beyond the net regenerates the purification function of the sand, and the cycle of the regeneration project of the filter can be prolonged. The invention discloses the filtering sand cleaning. Method, characterized by The method of washing, filtering, and returning the covered filter sand includes a method of washing the filter sand. The method comprises the steps of: sucking a set amount of the filter pool from the rapid filter pool for purifying water with the filter sand when the filter is countercurrently washed; Filter sand, and feed the sucked filter sand to the sand cleaning device. After the sand cleaning device removes the dirt of the filter sand, the filter sand from which the dirt is removed is returned to the rapid speed when the counter-flow washing of the rapid filter tank is performed. Filtration, pool. Furthermore, the filtering sand washing system of the present invention is characterized by comprising a rapid filtering tank, a mechanism for sucking sand from the rapid filtering tank, a sand washing device for washing the sucked filtering sand, and a sand washing device The mechanism for returning the decontaminated sand to the above-mentioned rapid filter tank. The filtering sand washing system can continuously process or batch process the steps of suctioning, washing, and returning the filtering sand. The reason why the "absorption of over sand" is carried out when counter-current washing is performed in a rapid filter tank is that the filtration sand is usually in a state of filtering water. In this state, if the filtration sand is absorbed, the filtration sand layer will A thin part of the sand layer is produced, which may cause leakage of the turbidity. It does not matter if the surface of the filter sand is being washed in the counter current while the surface is being washed. In addition, the reason why the "return of filter sand" is performed when the counter-current washing of the rapid filter tank is performed is that during the counter-current cleaning, the lower pressure chamber presses the purified water into the filter tank to make the sand float. When the filter sand is returned in the state, the filter sand can be washed countercurrently to form a flat layer. Furthermore, the paper size of the filter sand return and the size of the filter sand are applicable to the Chinese National Standard (CNS) A4 specification (21 × X 297 mm) ------------------- Order --------- (Please read the precautions on the back before filling in this page) 505531 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs Α7 Β7 V. Description of the invention (5) Absorb the same and wash it in countercurrent At the same time, it does not matter if the surface is being washed. The "set amount" means the amount of filtration and sand that does not affect the degree of purification of the water in the filter pond. Furthermore, it is desirable to perform the "suction of filter sand" so as not to make the surface of the gravel layer of the rapid filter pond uneven. Although the filter sand layer that passes quickly through the pond is about 00 cm, if the filter sand is attracted with too strong attraction, or it is absorbed near the boundary of the gravel layer, the thin layer of the gravel layer supporting the filter sand will be formed. In the thick case, it is preferable to perform the suction to the extent that the surface of the sand dish layer does not become uneven. The absorption of filter sand is also affected by the structure of the filter layer or its suction force, but it is preferably from the surface of the filter sand layer to a depth of 15 to 70% of the filter sand layer, more preferably a depth of 40 to 60%. In addition, it does not matter if the net cover to prevent unevenness is used at a depth of 100%, that is, directly absorbed on the surface of the sand dish layer. After the filter sand is decontaminated by the sand cleaning device, the filter sand to remove the dirt can be left in the storage tank before being returned to the rapid filtration tank, or the filter sand after decontamination can be stored in the storage tank. The above-mentioned filtered sand after decontamination is returned before the above-mentioned reverse-current washing of the above-mentioned suction-washing of the filtered sand is completed. In the case where no storage tank is provided, the above-mentioned steps I 'of suctioning, washing, and returning the filter sand may be continuously performed during the above-mentioned reverse mud washing. In the case where there is a% retention tank, it is desirable that the stored filter sand is not in contact with air and is under water or an acidifier. It is desirable to use gas as an acidifying agent. After the cleaned filtering sand is moved to the storage tank by the sand cleaning device, the empty sand cleaning device can be used for other sand cleaning by quickly passing through the pond. In addition, the storage tank is filled with water or water containing an acidifier to prevent the sand from drying. --- (Please read the notes on the back before filling in this page} -8-This paper is standardized by Guan Jiaxian (CNS) A4 (21G Public Love 5553553) Printed by the Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (6), so that the activity of the manganese layer of the filter sand capable of removing raw water manganese can be maintained. The size of the storage tank is such that the set amount of filter sand absorbed by the filter tank can be stored at least once and can make the filter sand The amount of water that does not touch the air is sufficient. The filtering sand cleaning method and system of the present invention can also be applied to the filtering sand cleaning of a plurality of rapid filtering ponds with so-called green leaf (4 to 6) rapid filtration and ponds connected to each other. That is, the present invention is a method for repeatedly filtering, washing, storing and returning the filtering sand to wash the filtering sand of the plurality of rapid filtering ponds, and the method comprises purifying water from the filtering sand. When the rapid filtration tank is subjected to countercurrent washing, it absorbs a set amount of filter sand from the filtration tank The sucked filter sand is supplied to a sand cleaning device. After the sand of the filter sand is removed by the sand cleaning device, the filter sand from which the dirt is removed is stored in a storage tank, and the stored filter sand is returned to the rapid The rapid filter tank with a different filter tank is returned to the rapid filter tank when the counter-flow washing of the rapid filter tank is carried out. The reason why the stored filter sand is returned to the filter tank which is different from the filter tank which sucks and removes the filter sand is that if you want to send Back to the same filter, the pool can not wait until the next counter-current washing of the filter pool can be done, in fact, its cleaning time is one by one to wash the filter sand of each tank time is necessary. Even if a plurality of storage tanks are installed, each of which is returned to the same suction filter tank, there is no difference in time for the single filter and the filter sand washing of the tank, but in this case, it is uneconomical to use equivalent equipment and land. Furthermore, if a relatively large storage tank is provided, it can store the filtered sand sucked and cleaned by a plurality of filter ponds. In this case, a considerable investment in equipment is also required. However, there are usually a plurality of rapid passing The water purification place connected to the filter and the pool is processed by each rapid filtering and counter-current washing of the pool. The paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) ---------- ---------- Order --------- (Please read the notes on the back before filling out this page) 505531 Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Invention Description From the point of view of (), the time is not processed at the same time, and the time is arranged. According to this, "Using this time to dispose of the process, even if you quickly pass the Dechi 増 into a plurality of situations, it is ': down' and a filter, the pool of All the filtering and sand washing time is almost the same. The filtering sand of all the filtering tanks can be washed in the same time. In addition, the size of the filtering sand of the male filter tank and the single filtering tank is the same. One cliff is enough, which is ideal from the viewpoint of equipment cost. Furthermore, in a water purification plant with a plurality of rapid filtration tanks, there may be cases where there is a large number of cold sand in the filter sand and a filter tank with less sand in the filter sand. In this case, the filter sand absorbed by the filter tank with more filter sand dirt is returned to the filter tank with less filter sand dirt, and the filter sand absorbed by the filter tank with less filter sand dirt is returned to the filter sand with more dirt. Filtration tanks are ideal from the standpoint of leveling in filter sands with multiple filtration tanks. It is desirable that the repetition of each of these steps is performed automatically by sequence control. That is, the counter-current washing of the rapid filter tank can be controlled by pressure loss and time as factors, and the steps of suction, washing, and other steps of filtering sand can be controlled in a sequential manner, or the steps of suction, washing, storage, and return of filtering sand can be coherent The process is implemented automatically. At the same time as the suction sand is returned and returned, it is carried out while the filtering sand floats in the countercurrent washing. It is ideal that the suctioned filtering sand is not mixed with the decontaminated filtering sand to improve the cleaning efficiency. Therefore, it is ideal to return the decontaminated filter sand at a position far away from the suction position of the filter sand in the rapid filtration tank. That is, a mechanism in which the mechanism that sucks the filter sand from the rapid filter tank and the mechanism that returns the decontaminated filter sand to each other is far from ideal. In addition, from the point of view of filtration and sand washing efficiency, the position of the filtration sand absorption is -10 with the filtration sand. The paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) ----- ---------------- Order --------- (Please read the precautions on the back before filling this page) 505531 A7

V. Description of the invention (8) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, “Private Movement” has gone to the “return position of filter sand, and it is also ideal for private movement with the return of filter sand. That is, at least one of the mechanism that sucks the filter sand from the rapid filter tank and the mechanism that returns the decontaminated filter sand to the rapid filter tank is a movable installation. The "sand washing device" is announced in Japanese "Japanese Patent Application Laid-Open No. 10-010951" I device, that is, a storage tank for storing sand and washing water at the same time, and the washing tank is mounted approximately vertically. The screw conveyor (Screw cone) and the rotary spoke conveyor rotate the shaft and the washing water of the lower part of the screw conveyor below the surface of the washing water through the rotation of the screw conveyor. At the same time ascending, the sand between the washing water and the sand contact each other to decontaminate the sand and flow on the sand wool screw on the upper part of the screw conveyor on the water surface of the washing water. Circulation method that uses the mechanism between the water containing sludge and the above-mentioned sand containing sand to rotate at a speed capable of decontamination to lower the rising sand to the lower part of the screw conveyor, and then rises through the screw conveyor The institution is ideal. In the past, filter sand washing that only relied on surface washing and countercurrent washing was performed. Due to the over-sand washing method of the present invention, when the countercurrent washing is performed, rapid filtration and pool suction are used to collect a sufficient amount of filtering sand to absorb the filtration sand. The sand is supplied to the sand cleaning device, and the filter sand is decontaminated by the sand cleaning device. The decontaminated filter sand is returned to the rapid filter pool when it is washed countercurrently, and the suction, washing, and return of the filter sand are repeated. The filter sand of the rapid filter tank is cleaned, so the filter sand can be effectively washed under the endless operation of the filter tank, and the cycle of the filter tank renewal project can be extended significantly. More specific, such as suction, washing, and returning of sand through repeated filtering -11-This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) ----------- -------- J ^ T * 11 SI (Please read the precautions on the back before filling this page) 505531 77 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 ____B7_____ Description of the invention (9) The filter will be quickly filtered About all of the filter sand is automatically washed, which can regenerate the water purification function of the filter pond. In addition, if the filter sand is decontaminated, the filtration resistance can be reduced, so it is easy to carry out counter-current washing with the designed pressure, so that the outflow of the filter sand can be reduced, and the outflow of the peeled sludge can be greatly reduced, which can make unevenness. The formation delay is from this point, which can make the filtration and the regeneration period of the pond be extended significantly. In addition, a set amount of filter sand is sucked by the filter pool during countercurrent washing, and the filtered sand is sucked and supplied to the sand cleaning device, and the filter sand is decontaminated and the decontaminated filter sand is stored in the storage tank through the sand cleaning device. After the counter-current washing is performed, the stored filtering sand is returned to a rapid filtering tank different from the rapid filtering tank that has been sucked. Through repeated steps of suction, washing, storage, and returning of the filtering sand, the filter tank runs endlessly. In the case of the filter sand of a plurality of filter tanks can be effectively washed. In addition, because the stored filtering sand is returned to the rapid filtering tank which is different from the sucking rapid filtering tank, the filtering sand of the multiple filtering tanks can be washed in almost the same time as that of the single filtering tank. In addition, when returning the filter sand, return the filter sand absorbed by the filter tank with more filter sand dirt to the filter tank with less filter sand dirt 'and return the filter sand absorbed by the filter tank with less filter sand dirt to the filter sand. If there is a lot of dirt in the pond, filtering can be performed, the pond can be filtered, and the sand can be leveled. In addition, in the filtering sand cleaning method and the cleaning device of the system of the present invention, there is a field retention tank that stores sand and washing water at the same time, and a spiral conveyor (about a vertical axis) is rotated in the cleaning tank ( Screw conveyer), the screw conveyor, while the sand under the water surface of the above-mentioned washing water and the above-mentioned sand in the lower part of the screw conveyor and the washing water are raised by the rotation of the screw conveyor, -12- this paper Standards apply to China National Standard (CNS) A4 specifications (210 X 297 mm) ^ 1 · ϋ · ϋ n ^^ 1 ϋ · n ϋ n ϋ— tmmtm ni I flu · ϋ order inmnm an m I s (Please read first Note on the back, please fill in this page again) 505531 No. 089124168 Patent Application F / r Chinese Manual Correction Page (May 91), B7 > v V. Description of Invention (1〇) The sand is in contact with each other to decontaminate the sand, and the sand on the upper part of the screw conveyor on the water surface of the washing water flows on the screw conveyor, and the water containing sludge and the sand containing slightly dirt and The mechanism that the contact between sand rotates at the speed that can decontaminate The sand is lowered to the lower part of the screw conveyor, and then the device of the circulation method for rising through the screw conveyor can be used when the sand is not broken, so that the sand and the sand are kneaded with each other to make the dirt fall off, and the filter can be filtered. The water purification function of the sand is regenerated to a state close to the new sand, so that the period of the regeneration project of the filter can be extended more rapidly. In addition, the countermeasures of water purification waste for Critosporidium have traditionally responded by increasing the frequency of surface cleaning and countercurrent cleaning. The present invention can maintain the turbidity at the outlet of the filter tank with surface cleaning and countercurrent cleaning at normal frequency. Below 0.1 degree, it becomes one of the countermeasures of Critosporidium, and enables the water purification plant to move without reducing the purification efficiency. Brief Description of the Drawings Fig. 1 is a step diagram of the embodiment of the filtering sand washing method of the present invention. Fig. 2 is a schematic diagram of a first embodiment of the filtration sand cleaning system of the present invention. Fig. 3 is a schematic view of a second embodiment of the filtration sand cleaning system of the present invention. FIG. 4 is a step diagram of another embodiment of the filtering sand washing method of the present invention. Fig. 5 is a step diagram of still another embodiment of the method for cleaning sand by filtration according to the present invention. Fig. 6 is a sectional view taken along line A of the rapid filter tank shown in Fig. 2. Fig. 7 is a flow chart of filtering sand corresponding to a plurality of filtering tanks. Fig. 8 is a diagram showing an example of the movement of the filtering sand between the filtering ponds. Component symbol description-13- This paper size applies Chinese National Standard (CNS) A4 specification (210 X 297 mm) gutter 505531 A7 B7 No. 089124168 Chinese patent application for correction of fear of writing (May 91) V. Description of the invention (10a) 1 rapid filter 2 pump 3 sand washing device

4 5 6 7 Washing and drainage layer 1 11 12 13 ～ 16 21 22 Description of the preferred embodiment of the surface washing tube -13a- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) 505531 A7 B7 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. 5. Description of the invention (As shown in FIG. 2, the filter sand cleaning system of the present invention is provided with a rapid filter tank 1 and a filter filter 1 for sucking dirt attached to the filter sand. Pu 2, the sand washing device 5 for washing the filter sand 5 attached to the dirt 3, the sand storage device 4 for storing the washed filter sand 6 which has been washed in the sand washing device 3, and the sand for washing The storage tank 4 returns devices such as the channel 7 for removing the dirt and sand to the rapid filtering tank. In addition, the filtering sand cleaning system of the present invention is also shown in FIG. 3, which includes a rapid filtering tank 1, and a rapid filtering tank 丨Pumps for sucking dirt-attached filter sand 2, sand-washing devices 3 for washing dirt-attached filter sands 5, and channels 7 for returning dirt-removed sand from sand washing clothes 3 to the rapid filtration tank 1 , That is, no washing sand storage tank can be installed. No washing sand storage can be installed. In the case of the filtration sand washing system, the installation cost of the washing sand storage tank can be saved. Furthermore, in the case where there is no extra land around the rapid filter tank 1 where the washing sand storage tank 4 can be set, this is ideal. Figure 3 is a processing example of the filter sand cleaning system. For example, as shown in Figure 4, the surface cleaning and countercurrent cleaning of the rapid filter tank 1 are performed within about lm3 within 15 minutes ^ 25 minutes. Contaminated filter sand is attracted by the rapid filter pool 丨 with pump 2 and the filtered sand sucked by pump 2 is sent to the sand washing device 3 and washed in the sand washing device 3 within a short time (about a minute). Send the cleaned filter sand (clean sand) back to clean the dirt in a short time before the surface cleaning and countercurrent washing are completed quickly. The counter-current washing time (for example: 7 minutes) will pass the contaminated sand from the rapid pass through the pond ^ Pump 2 continuous suction 'The pumped sand from the pump 2 is sent to the sand cleaning device 3, Continuous cleaning in the sand washing device 3, washing and reversing on the surface that has passed quickly --------- ---------- Order --------- Line (Please read the precautions on the back before filling this page) -14-

A7-^ ____B7 __ l 'Explanation of the invention (12) Before the end of the flow cleaning, the sand is continuously sent back to the rapid filtering pool 丨 and other steps for processing' Similarly, the processing is performed during the time of surface cleaning and countercurrent cleaning ' In a short time, more dirt can be washed. The rapid filter tank 1 is shown in FIG. 6. The filter layer includes a filter sand layer 12 and gravel layers 13 to 16 which support the sand layer 12. The filter sand layer 12 is formed of sand with an effective diameter of 0.6 dirty and an equal coefficient of 1.5 or less. The gravel layers 13 to 16 are formed by 4 layers with different grain sizes. As a support layer, the filter sand layer 12 is prevented from entering the water collection rack (not shown, but the water collection device for purifying water is installed in the rapid filter tank 1). Xia Shao). In order to make the counter-current washing energy uniform, the sand dish layers 13 to 16 are selected to be approximately spherical and hard to clean and homogenize. Its particle size is generally used, that is, the effective diameter of the sand dish layer 13 is 2.0 to 3.5 imn. The sand dish layer μ is 3 5 to 70 coffee, the gravel layer 15 is 7.0 to 13.0 mm, and the gravel layer 16 is 13 to 20 mm. The order of fine particles is to place the upper layer and coarse particles to the lower layer. (Flat). The raw water-based turbidity on the filter sand layer 12 is introduced by the agglutinating agent to precipitate the water before the treatment, and the filter sand layer 12 is washed on the surface of the filter sand layer 12 when the surface is washed above the filter sand layer I2. It is set on the surface washing tube 22 shot by the mouth and mouth, and the conveying groove 21 for discharging washing and drainage during surface washing and countercurrent washing. Next, the general purification process steps of raw water will be explained briefly. The turbidity of the raw water condensed into the Shendian pond is introduced from rivers and lakes. After the agglomeration of the sanitation hall with agglutinating agents such as polysalt, the upper layer of clear water is filtered quickly, the filter in pond 1 and the sand layer 12 are sent to water. Through the filtering sand layer 12, fine suspended matter which cannot be removed by the agglomeration sinking pond is removed. The filtered water is collected by a water collecting device provided at the lower part of the rapid filter tank 1. The collected water is sterilized by gas and stored in a distribution tank. Over -15- This paper size is in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling this page) Order · — Line ♦ · Intellectual Property Bureau, Ministry of Economic Affairs, Consumer Consumption Cooperative Printing 505531 \ Five A7 -----———— BZ____ Description of the invention (13) The filtration speed is usually 120 ~ 150 m / g. Generally, the filtration process of the purified water is stopped periodically or when the loss of water head reaches 15 m at this filtering speed. The pressure water in the lower part of the rapid filter tank 1 is used to press the washing water into the filter sand to float the sand. Knead in between to wash. The surface washing is performed by spraying washing water on the surface of the filter sand layer 12 with a surface washing pipe 22 in accordance with the time of the counter current washing or the counter current washing cycle. The washing drainage i i after the surface washing and the countercurrent washing are discharged from the conveying tank 21. After the washing is finished, the pre-treated raw water is pumped again, and filtering is started. The steps of water purification and washing are usually automated, and the water purification plant that performs water purification treatment by the rapid filtration method is based on the state of the original water, and the time of surface washing and countercurrent washing is set in advance, or it is set at a certain loss of water head. When it is above 表面, the surface washing and countercurrent washing are performed automatically. Table 2 shows the selection criteria of the filter sand (Japanese Water Works Association Specification JWWA a 103-1988). The cleaning turbidity is less than 30 degrees, the solubility of hydrochloric acid is less than 35%, the effective diameter is 0.45 ~ 0.70 _, the equal coefficient is 17 . Although the general surface washing and countercurrent washing are performed as described above, after the new sand is used for 10 years, even if the regeneration project is carried out every 7 years, the cleaning turbidity is 1480 degrees as shown in the original 'depleted sand' in Table 2, and hydrochloric acid is soluble. The turbidity rate of 9.7%, effective diameter of 0.533 legs, equal coefficient of 1 485 and so on adhere to the filter sand, and it can be said that there is considerable dirt. (Please read the precautions on the back before filling in this page) Order i Printed brake clothing for the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs [Table 2] Filtered sand selection 椁 Quasi-original dirty sand washing turbidity (degrees) 30 degrees or less 1,480 Hydrochloric acid soluble ratio (%) 3.5% or less 9.7 Effective diameter (_) 0.45 ~ 0.70 0.533 Equal coefficient 1.7 or less 1.485 -16- This paper size applies the Chinese National Standard (CNS) A4 specification (210 x 297 mm) Ministry of Economic Affairs Printed by the Consumer Property Co., Ltd. of the Intellectual Property Bureau 505531 A7 ____ B7 14 " --- 5. Description of the invention () Similarly, if the filter sand with turbidity continues to be used, it will cause the phenomenon of plugging S gap due to turbidity. The rapid loss of water head increases the number of counter-current washings. Due to the influence of the water pressure of this counter-current washing on the sand dish layer, unevenness will be formed early. Because unevenness is formed in the thick part of the gravel layer, the sand layer is thin. 'This part produces insufficient filtration. In addition, the sludge substance and the adsorbed material peeled from the filter sand may cause break through (Break Through) and cause The filtered water has an adverse effect. If such a state is formed, it is necessary to do a rehabilitation project. In the following, in addition to the above-mentioned general cleaning steps, a part of the filter sand is taken out in a sand cleaning device to be washed, and then the decontaminated sand is returned to the step sand cleaning system. (Example 1) The sand washing device 3, as disclosed in Japanese Patent Application Laid-Open No. 10-100950, I, is provided with a washing tank that stores sand and washing water at the same time, and the washing A screw conveyor (Screw cone) and a β screw conveyor rotating around the vertical axis in the clean tank pass the lower part of the screw conveyor below the surface of the washing water < the sand and the washing water are passed through the While the screw conveyor is rotating and rising, the sand between the washing water and the sand are in contact with each other to remove the sand. The above is on the upper part of the screw conveyor on the water surface of the washing water. Stone > A mechanism that flows on the wool screw conveyor and rotates at a speed capable of decontamination by the contact between the water containing sludge and the above-mentioned sand and sand with a little dirt, and the rising sand is lowered to the lower part of the screw conveyor, and then The mechanism of the rubbing and washing method is implemented by the mechanism of the circulation method of the ascent of the screw conveyor. As shown in Figures 1 and 2, the time for surface cleaning and countercurrent cleaning of the rapid filter tank 1 (7 minutes -17- This paper is cleverly adapted to CNS A4 specifications (2ΐί) X 297 public love) ( (Please read the note on the back? Matters before filling out this page)

A7 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs [Table 3]

2. Description of the invention (~ 10 minutes) The polluted filter sand of lm3 shall be connected to the corner (la) of the rapid filter tank 1 through ′ 2 and the lead. The suction of the filtering sand is performed at a depth of about 10 cm above the gravel layer 13 (the thickness of the filtering sand layer is 60 cm). The sand 5 attracted by the pump 2 is sent to the sand washing device 3, and the sand washing device 3 is washed for about 1 hour. As can be seen from Table 3, the washing turbidity of the filtered sand $ that was attracted after 丨 hour cleaning was reduced from 1480 degrees to 丨 丨 degrees, the hydrochloric acid solubility rate was reduced from 9 7% to 28%, and the equality coefficient decreased from 1.485. It is 丨 .280. After washing, it reaches the same level as the new sand. The washed sand 6a is stored in a washing sand storage tank filled with water. After 48 hours of rapid filtration and filtration in pond 1, the 遽 止 was suspended. The second surface washing and counter-current washing were stopped. At this time, the corner corresponding to the corner u "sent the washed sand. Back. By repeating this cycle operation, 60m3 of almost all the filtered sand in the rapid filter tank 1 is washed in about 120 days. (Example 2) The specific sand washing clothes used in Example 1 were used to wash the sand. The device is changed to the previous jet water flow, and the other is the same as that of the filter sand cleaning. As shown in Table 4, compared with the specific sand cleaning device used in Example 丨, there are some intentional differences but the original dirty sand. It was specially cleaned. But in the example [情 -18 This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) --------- -------- ------------- Order --------- (Please read the precautions on the back before filling out this page) 505531 ^ __ Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs Net turbidity (degrees) Hydrochloric acid solubility rate (%) Effective diameter (mm) Equal coefficient Invention description (Condition: Grain! There is almost no change, it is performed for a long time The lower effective diameter decreases and the uniformity coefficient becomes larger. From this, it can be seen that the conventional sand cleaning device using a jet of water makes the sand collide with the pipe wall and the like during the cleaning process. [Table 4] After cleaning Raw dirt 1,480 9.7 0.533 1.485 10 minutes 20 minutes 30 minutes 60 minutes 208 173 167 88 9.2 8.9 8.7 6.6 0.606 0.603 0.590 0.577 1.287 1.287 1.290 1.301 Next, the method and method of cleaning the filter sand in the case of a plurality of rapid filter tanks The system is explained with Fig. 7 and Fig. 8. Fig. 7 shows the flow of filter sand corresponding to a plurality of filter ponds, and Fig. 8 shows an example of the movement of filter sand between the filter ponds. Here, as shown in Fig. 7, rapid filter ponds A to F There are 6 rapid filter tanks, a filter system consisting of a sand cleaning device and a storage tank as an example for illustration. However, the principle of the number of filters and pools is the same if the number is greater than or less than this number. .

The filter tanks A to F are each subjected to countercurrent washing every 48 hours. As shown in FIG. 7, the time interval for countercurrent washing of each filter tank is 8 hours. First, a set amount of filter sand is sucked by the tank A. The sucked filter sand is washed in a sand washing device for about 1 hour. Decontaminated filter sand is stored in a storage tank containing water or water containing an acidifying agent. The stored filtering sand is washed back to the filtering tank B after 8 hours of countercurrent washing in the filtering tank A, and then returned to the filtering tank B where countercurrent washing is started. For filter tank B -19- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) ------------------------ ----- (Please read the precautions on the reverse side before filling in this page) 17505531, suction filter sand A7 is sucked. V. Description of invention The filtering sand is washed in the sand washing device for about 1 hour. The washed filtering sand is stored in a wild tank filled with water or water containing an acidifying agent. The stored filtering, sand is filtered, filtered, and pooled. After 8 hours of countercurrent washing of B, return to the filtration tank c that started the countercurrent washing. During the countercurrent washing of the filtration tank C, wash the sand and return it while sucking the contaminated filtering and sand. After 48 hours, In all the filter ponds A ~ F, while sucking the set amount of filter sand, it also sends back the set amount of cleaned filter sand. Repeat this step to wash all the filter sand in filter pools A ~ F. In this way, by blending The counter-current washing time of the plurality of filter tanks can be washed in the same time as the single washing; the time required for filtering and sand of the filter tank is almost the same. Filter sand from a plurality of filter ponds. In addition, when the dirt of the filter sand from the pond is too high> When the order of the pond AF is considered, as shown in Figure 8, the filtered sand from the pond A is sent To filter tank E, the filtered sand after filtering tank E is sent to filter tank c, the filtered sand after filtering tank c is sent to filter tank D, and the filtered sand after filtering tank D is sent to Filter tank A, so that the filter sand of filter tanks A to F can be leveled. Furthermore, at least, the step of sucking the filter sand by the rapid filter tank, the step of filter sand washing by the sand cleaning device, and step J of the filter sand step I of returning the decontaminated filter sand to the rapid filter tank, and the filter sand is sucked by the rapid filter tank. Steps, sand cleaning of the sand cleaning device; first cleaning step, male Ning Liu washing, filtering sand in the Benin leaving trough step, and returning the decontaminated filtering sand step to the rapid filter tank. By doing so, the long-term period of over-sand sand can be maintained in the same state as the new sand, and the period of the rehabilitation project can be prolonged. 'Paper scale stabbing -------- ^ --------- (Please read the notes on the back before filling out this page} Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economy 297 mm -20-

Claims (1)

505531 A8 B8 C8 D8 VI. Application for Patent Scope The Intellectual Property Bureau of the Ministry of Economic Affairs, Employees ’Cooperative, printed a method of filtering and sand washing, which is characterized by the following: A set amount of filter sand is sucked from the rapid filter tank, and the sucked filter sand is supplied to a sand cleaning device, and the filter sand is decontaminated by the sand cleaning device. The decontaminated filter sand is countercurrent to the rapid filter tank. When washing, send it back to the rapid filtering tank, repeat the steps of suction, washing and returning the filtering sand. Wash the filtering sand in the rapid filtering tank. For example, the filtering sand washing method of the scope of application for patent No. 1 uses one kind of the aforementioned sand washing device, which includes a storage tank for storing sand and washing water at the same time; The cleaning tank is surrounded by a spiral rotating around a vertical axis. Conveyor; Rotating mechanism, the rotating speed of which can rotate the screw conveyor to the lower part of the screw conveyor located on the washing water surface, the sand and the washing water rise, and at the same time The washing water ^ the sand is in contact with each other to remove the sludge of the sand, and the upper part of the screw conveyor located on the surface of the washing water makes the sand flow on the screw conveyor, Remove the sand's sludge by contacting the sand with only some water containing cold mud ^ The shield ring mechanism makes the rising sand lower to the lower part of the screw conveyor, and then borrows the screw The conveyor makes it rise. 3. = No. of patent application scope! The method for washing slag in the item, wherein after the sludge of the filtering sand is removed by the above-mentioned washing device, the decontaminated filtering sand is sent to the storage tank before passing through the sampan tank. 4. For example, if you apply for the cleaning of sand in the scope of the patent application item ^, which will go to the above 2. Leave T to make 丨 -------- ^ -------- (Please read the back first Please pay attention to this page before filling in this page) Line · -21 This paper size is applicable _ Home Standard (CNS) A4 specification (210 X 297 Public hair 505531 A8 B8 C8 D8 6. Application scope of patent 6. Employees of Intellectual Property Bureau, Ministry of Economic Affairs The filter sand printed by the cooperative is transported before the countercurrent washing when the above-mentioned countercurrent washing of the filter sand is sucked up. For example, the method of filtering sand cleaning according to item 4 of the patent scope, wherein the above-mentioned filtering, sand The steps of suction, washing and returning are continuously performed during the above-mentioned countercurrent washing. For example, the filtering sand washing method in the scope of patent application No. 3, wherein the filtering sand stored in the field storage tank is incompatible with The air is contacted, and water or acidifier is put into it. A method for cleaning filter sand is characterized by: using a rapid filter tank for purifying water with filter sand for countercurrent washing and sucking from a long distance through the pond A set amount of filter sand is supplied to the suctioned sand to the sand cleaning device , Using the sand cleaning device to decontaminate the filter sand, the filter sand that has been decontaminated is stored in a storage tank, and the stored filter stone is sent during counter-current washing of a rapid filter tank different from the rapid filter tank. Return to the rapid filtration tank; repeat the above steps of suction, washing, storage, and delivery of the filtration sand to wash the filtration sand in most rapid filtration tanks. For example, any of the first to seventh items in the scope of patent application The filtering sand washing method 'wherein' the repetitive operation of the above steps is automatically performed by sequence control. For example, the filtering sand washing method of any of the items 1 to 7 of the patent application scope 'wherein' is away from the above rapid filtering The position where the pond sucks the above-mentioned filter sand is returned to the decontaminated filter sand. 10. For the filtering sand cleaning method according to any one of the items 1 to 7 of the scope of patent application, wherein the above-mentioned filter sand suction position is at Move the position after sucking the filter sand. 11. If the filter sand is cleaned in any of the items 1 to 7 of the scope of patent application 8. 9. 22- This paper size is applicable to China National Standard (CNS) A4 specifications ( 210 X 297 mm ------------% (Please read the precautions on the back before filling this page) Order ---------- Line 505531 A8 B8 C8 D8 VI. Patent Application Scope Law Wherein, the position where the above-mentioned filter sand is returned is moved after each return of the filter sand. 12. For the method for cleaning the filter sand according to any one of the items 1 to 7 of the scope of patent application, wherein the above-mentioned filter sand The suction is carried out so that the gravel layer of the filter tank does not form uneven attraction strength. 13.-A filter sand cleaning system, which is characterized by: The mechanism for quickly passing> the pond ponds the sand> the pond ponds the sand, the sand washing device that cleans the sucked filtering sand, and the sand washing device sends the decontaminated filtering sand back to the above rapid filtering pool. 14. For example, the sand purifying system for purged sand in item 13 of the scope of patent application, which further includes a storage tank for filtering sand which has been decontaminated by the sand washing device before being returned to the above-mentioned rapid filtering tank. 15. For example, the filtering sand cleaning system according to item 14 of the patent scope, wherein the storage tank is provided with a mechanism for supplying water to prevent the filtering sand in the storage tank from contacting the air. 16. According to the filtering sand cleaning system in the scope of application for item 13, in which the above-mentioned rapid passing pond is provided with a plurality. 17 · The filtration sand cleaning system according to any one of the items 13 to 16 of the scope of application for a patent, which is characterized by the steps of sucking the filtration sand by the rapid filter tank and the filtration sand washing of the sand cleaning device. At least 3 steps of the clean step and the step of returning the decontaminated filter sand to the above-mentioned rapid filter tank, or the step of sucking the filter sand by the above-mentioned rapid filter tank, and the above-mentioned sand washing device are over 23- Standard (CNS) A4 specification (210 X 297 public love) (Please read the precautions on the back before filling this page) Order ------ Intellectual Property Bureau of the Ministry of Economic Affairs, Consumer Consumption Cooperative Seal 505531, Intellectual Property Bureau of the Ministry of Economic Affairs At least 4 steps of A8 B8 C8 D8 printed by employee consumer cooperatives, steps of applying for patent filtering sand cleaning, storing and cleaning filtering sand in a storage tank, and returning decontaminated filtering sand to the above-mentioned rapid filtering tank 'And the mechanism is controlled automatically by sequence control. 18. The filtering sand washing system according to any one of claims 13 to 16 in the scope of the patent application, wherein the mechanism for sucking the filtering sand by the rapid filtering tank and the mechanism for returning the decontaminated filtering sand to the rapid filtering tank , It is set at a position far away from each other as mentioned above. 19. The filtering sand washing system according to any one of claims 13 to 16 in the scope of the patent application, wherein the mechanism for sucking the filtering sand by the rapid filtering tank and the mechanism for returning the decontaminated filtering sand to the rapid filtering tank , Set at least one side is removable. 20 · If the filtering sand washing system according to any one of the scope of application patents Nos. 13 to 16, the above-mentioned sand washing device is provided with a washing tank that simultaneously stores sand and washing water; A screw conveyor that rotates about a vertical axis; The turning mechanism can rotate at a speed that can lower the above-mentioned screw conveyor below the above-mentioned washing water surface, and rotate the screw conveyor to make the above sand and the above-mentioned washing The water rises, and at the same time, the sand sludge is removed by contacting the sands through the washing water; and the upper part of the screw conveyor on the washing water surface is used to place the sand on the above The flow on the screw conveyor removes the sludge of the sand by contacting the above sand containing only some water containing sludge; / The circulation mechanism makes the rising sand descend to the lower part of the screw conveyor ' After the righteousness, it is raised by the screw conveyor. (Please read the notes on the back before filling this page) Order ---------- Line j -24-