Wastewater treatment apparatus, cartridge, and method of removing cartridge from wastewater treatment apparatus

Abstract

To provide a wastewater treatment apparatus with easy removal of a cartridge.SOLUTION: A wastewater treatment apparatus includes a tank body having an inlet and outlet and a manhole opening on an upper side, a disinfection tank contained in the tank body, and at least one cartridge located in the disinfection tank. The disinfection tank is provided on the lower side of the manhole opening. The disinfection tank is configured so that water flows from the inlet to the outlet. The cartridge is positioned in the disinfection tank directly below the manhole opening. At least one cartridge has a cylindrical body part having an opening on an upper side and configured to contain a disinfectant therein, an exposure opening provided at a lower end of the body part and configured to expose the disinfectant from the body part, and at least one through hole through the body part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a wastewater treatment device, a cartridge, and a method for removing the cartridge from a wastewater treatment device. [Background technology]

[0002] As a wastewater treatment device (also called a septic tank) for treating wastewater such as domestic wastewater, there is known a wastewater treatment device that transfers water after a prescribed treatment to a disinfection tank, where the water is disinfected and then discharged. A cartridge containing a disinfectant is placed in the disinfection tank, and a manhole cover is placed on the upper side of the disinfection tank. The disinfectant in the cartridge is consumed over time. To refill the disinfectant, etc., the cartridge is removed from the disinfection tank by an operator (manager).

[0003] However, in wastewater treatment equipment, it may be difficult for an operator to reach the cartridge even if he or she stretches his or her arm into the manhole, and the operator may be forced into an awkward position in order to remove the cartridge.

[0004] Regarding the removal of the above-mentioned drug cylinder, Patent Document 1 describes a disinfection tank formed separately from the septic tank body and connected to the septic tank body by piping. In Patent Document 1, the degree of freedom of arrangement of the drug cylinder relative to the entire septic tank can be improved, so that the drug cylinder can be arranged in a position that is easily reachable by the worker's arm. This makes it easier to remove the drug cylinder. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2003-136081 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, even if the cartridge is placed in a position that is easily within reach of the worker's arm, the worker must reach into the manhole to grab the cartridge and pull it upwards in order to remove it from the wastewater treatment device. This may force the worker into an awkward position to remove the cartridge. In addition, when a relatively high residual chlorine concentration value is required, the amount of disinfectant put into the cartridge increases, and the weight of the cartridge increases. This can make it difficult to remove the cartridge. Therefore, a technology is required to easily remove the cartridge from a septic tank (wastewater treatment device) equipped with a disinfection tank. [Means for solving the problem]

[0007] According to a first aspect of the present disclosure, a wastewater treatment device is provided. The wastewater treatment device includes a tank body, a disinfection tank, and at least one drug cylinder. The tank body includes an inlet through which water to be treated flows and an outlet through which treated water flows. The tank body further includes a manhole opening on the upper side. The disinfection tank is included in the tank body. The disinfection tank is provided below the manhole opening. The disinfection tank is configured so that water flows from the inlet toward the outlet. The at least one drug cylinder is disposed in the disinfection tank directly below the manhole opening. The at least one drug cylinder has a cylindrical main body, an exposure opening, and at least one through hole. The main body has an opening on the upper side. The main body is configured to be able to accommodate a disinfectant therein. The exposure opening is provided at the lower end of the main body. The exposure opening is configured to expose the disinfectant accommodated in the main body from the main body. The at least one through hole passes through the body in a direction intersecting the axis of the body at an upper end of the body.

[0008] In the wastewater treatment device of the above aspect, at least one cartridge is disposed directly below the manhole opening of the tank body. Also, at least one cartridge has at least one through hole penetrating the main body. Therefore, an operator can insert (lock) a hook-shaped (hook-shaped) part into at least one through hole. Therefore, an operator can grasp a tool having a hook-shaped part, insert the tool into the tank body from the manhole opening to lock the hook-shaped part into the through hole, and move the tool upward to remove the cartridge from the wastewater treatment device. Therefore, a wastewater treatment device that allows the cartridge to be easily removed can be provided.

[0009] According to a second aspect of the present disclosure, a medicine barrel to be placed in a disinfection tank of a wastewater treatment device is provided. The medicine barrel has a cylindrical main body, an exposure opening, and at least one through hole. The main body has an opening on the upper side. The main body is configured to be able to accommodate a disinfectant therein. The exposure opening is provided at a lower end of the main body. The exposure opening is configured to expose the disinfectant accommodated in the main body from the main body. The at least one through hole penetrates the main body in a direction intersecting the axis of the main body at the upper end of the main body.

[0010] According to the above aspect, an operator can move the cartridge upward by engaging the hook-shaped portion of a tool with at least one through hole and moving the tool upward. Therefore, it is possible to provide a cartridge that can be easily removed from the wastewater treatment device when the cartridge is installed in the wastewater treatment device.

[0011] According to a third aspect of the present disclosure, a method for removing a cartridge from a wastewater treatment device is provided. The wastewater treatment device includes a tank body, a disinfection tank, and at least one cartridge. The tank body includes an inlet through which water to be treated flows and an outlet through which treated water flows. The tank body further includes a manhole opening provided on the upper side. The disinfection tank is included in the tank body. The disinfection tank is provided below the manhole opening. The disinfection tank is configured so that water flows from the inlet toward the outlet. The at least one cartridge is disposed in the disinfection tank directly below the manhole opening. The at least one cartridge has a cylindrical main body, an exposure opening, and at least one through hole. The main body has an opening on the upper side. The main body is configured to be able to accommodate a disinfectant therein. The exposure opening is provided at a lower end of the main body. The exposure opening is configured to expose the disinfectant accommodated in the main body from the main body. The at least one through hole penetrates the main body in a direction intersecting an axis of the main body at an upper end of the main body. The method includes (i) inserting a tool having a rod-shaped portion, a hook-shaped portion provided at a first end of the rod-shaped portion, and a gripping portion provided at a second end opposite to the first end of the rod-shaped portion into the tank body from the manhole opening, (ii) engaging the hook-shaped portion with the at least one through hole provided in the at least one cartridge, and (iii) moving the tool upward to remove the at least one cartridge from the tank body.

[0012] According to the above aspect, an operator can easily remove the cartridge from the wastewater treatment device by grasping a tool having a hook-shaped portion, inserting the tool into the tank body through the manhole opening to engage the hook-shaped portion with the through hole, and moving the tool upward. [Brief description of the drawings]

[0013] [Figure 1] 1 is a diagram showing a schematic configuration of a wastewater treatment device according to an embodiment; [Diagram 2] FIG. 2 is an enlarged view of the disinfection tank and its surroundings in FIG. [Diagram 3] This is an oblique view of the disinfection tank seen from above the manhole opening. [Figure 4] This is an oblique view of the disinfection tank in which the cartridges are placed, seen from above the manhole opening. [Diagram 5] FIG. [Figure 6] FIG. 2 is a front view of the cartridge with the lid removed from the main body. [Figure 7] 4 is a flowchart for explaining a method for removing and installing a cartridge in the wastewater treatment device. [Figure 8] A top view of a manhole cover. [Figure 9] FIG. 13 is a diagram showing an example of a tool having a hook-shaped portion. [Figure 10] This is a view of the disinfection tank with the cartridge placed therein, viewed from directly above the manhole opening. [Figure 11] FIG. 13 shows the cartridge being removed from the disinfection tank. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] In one non-limiting embodiment of the present disclosure, the at least one through hole may be two through holes symmetrical with respect to the axis. According to this embodiment, an operator can more easily remove the cartridge from the wastewater treatment device by, for example, engaging the hook-shaped portion of a tool held in the left hand with one through hole and the hook-shaped portion of a tool held in the right hand with the other through hole, and then moving (lifting) the tools held in each hand upward.

[0015] In addition to or instead of the above embodiment, the at least one cartridge may include a lid. The lid may be removably attached to the upper end of the body. The lid may be configured to cover the opening of the body and the at least one through hole. According to this embodiment, it is possible to prevent the disinfectant in the cartridge from falling outside the cartridge through the through hole.

[0016] In addition to or instead of the above embodiment, the disinfection tank may include a cartridge placement section provided directly below the manhole opening. The cartridge placement section may be provided along a water flow path from the inlet to the outlet. The cartridge placement section may be configured to hold at least one cartridge. According to this embodiment, the water flowing through the disinfection tank is likely to come into contact with the disinfectant in the cartridge, so that the water can be effectively disinfected.

[0017] In addition to or instead of the above embodiment, the cartridge may further include an adjustment portion configured to be able to adjust an opening area of ​​the exposed opening portion. According to this embodiment, the amount of disinfectant dissolved in water can be adjusted.

[0018] Additionally or alternatively, the at least one through hole may have a diameter of 10 mm or more. The diameter may be 30 mm or less. According to this embodiment, it is possible to prevent the disinfectant in the cartridge from falling outside the cartridge through the through hole.

[0019] In addition to or instead of the above embodiment, the at least one cartridge may be two cartridges. When the diameter of the at least one cartridge is R1 and the diameter of the manhole opening is R2, the diameter R1 and the diameter R2 may satisfy the following formula (1). 0.30×R2≦R1≦0.45×R2...Formula (1) According to this embodiment, by placing two cartridges in the disinfection tank, even if the gap between the manhole opening and the cartridges is relatively narrow, an operator can remove the cartridge from the wastewater treatment device by engaging the hook-shaped portion of the tool with the through hole and moving the tool upward (lifting it).

[0020] In addition to or instead of the above embodiment, the wastewater treatment device may further include a manhole cover configured to be able to cover the manhole opening. The manhole cover may include at least one locking recess that appears to the outside when the manhole opening is covered. According to this embodiment, the worker can engage the hook of the tool with the engaging recess and move the manhole cover using the tool. After that, the worker can remove the cartridge from the wastewater treatment device by engaging the hook of the tool with the through hole and moving (lifting) the tool upward. Therefore, the tool for moving the manhole cover and the tool for removing the cartridge can be used together.

[0021] <Embodiment> With reference to Figs. 1 to 11, a wastewater treatment device 10 according to an embodiment of the present disclosure will be described. The wastewater treatment device 10 is a device for purifying domestic wastewater and the like. The wastewater treatment device 10 is also called a septic tank. As shown in Fig. 1, the outer shell of the wastewater treatment device 10 is defined by a tank body 101 having an inlet 102 and an outlet 103. The tank body 101 has a plurality of manholes (manhole openings) 109, 109a. Normally, each of the manhole openings 109, 109a is covered by a manhole cover 201. The manhole cover 201 is opened by an operator when inspecting and managing the inside of the tank body 101, removing and installing the cartridge 180, and the like. The wastewater treatment device 10 of this embodiment is configured to be capable of treating domestic wastewater from a scale of 50 people.

[0022] Hereinafter, in the wastewater treatment device 10, the inlet 102 side is defined as the front side (upstream side), and the outlet 103 side is defined as the rear side (downstream side), to define the front-rear direction of the wastewater treatment device 10 (tank body 101). In addition, the manhole openings 109, 109a side of the tank body 101 is defined as the upper side, and the opposite side is defined as the lower side, and the direction perpendicular to the front-rear direction is defined as the up-down direction. In this embodiment, the up-down direction is also the vertical direction.

[0023] In order to perform purification treatment through a plurality of steps, an inflow baffle 108, a sedimentation tank 110, an anaerobic filter bed tank 120, a contact filter bed tank 130, a treated water tank 140, and a disinfection tank 150 are provided in the tank body 101 in order from the upstream side. The inflow baffle 108 and each tank are partitioned by a partition wall 104. Wastewater that flows into the inflow baffle 108 through the inflow port 102 is treated in the sedimentation tank 110, the anaerobic filter bed tank 120, the contact filter bed tank 130, the treated water tank 140, and the disinfection tank 150 in sequence, and then discharged to the outside of the wastewater treatment device 10 through the outflow port 103. Hereinafter, the water flowing through each tank is also referred to as "water to be treated" or simply "water". Although detailed explanations are omitted, the water treated in a specific tank is transferred to a downstream tank by a transfer baffle, an opening, a pump, or the like.

[0024] The inflow baffle 108 constitutes the most upstream region of the wastewater treatment device 10. Water that flows into the inflow baffle 108 from the inflow port 102 is transferred (moved) to the settling separation tank 110.

[0025] The settling separation tank 110 is a treatment tank (treatment area) for settling and separating solid matter such as impurities contained in the water that flows in through the inflow baffle 108. The water that flows in to the settling separation tank 110 is subjected to solid-liquid separation treatment. The solid components separated from the water are deposited at the bottom of the settling separation tank 110 as settled sludge. Since the inflow baffle 108 is provided upstream of the settling separation tank 110, water is prevented from directly flowing into the settling separation tank 110 and stirring up the settled sludge. The water in the settling separation tank 110 is transferred to the anaerobic filter bed tank 120 through the opening 105 and the transfer baffle.

[0026] The anaerobic filter bed tank 120 is a treatment tank (treatment area) for anaerobic treatment of the water after solids have been separated in the settling separation tank 110. The anaerobic filter bed tank 120 is equipped with an anaerobic filter bed 121 filled with anaerobic filter media to which anaerobic microorganisms adhere. The water to be treated comes into contact with the anaerobic filter bed 121, thereby anaerobically treating the organic pollutants contained in the water to be treated. The water to be treated in the anaerobic filter bed tank 120 is transferred to the contact filter bed tank 130 through the opening 106 and the transfer baffle.

[0027] The contact filter bed tank 130 is a treatment tank (treatment area) for aerobic treatment of the water to be treated that has been treated in the anaerobic filter bed tank 120. The contact filter bed tank 130 includes contact materials 131 and 132 to which aerobic microorganisms are attached, and an air diffuser 133. The air diffuser 133 is configured to be able to supply air to the contact materials 131 and 132. When air is supplied from the air diffuser 133, the aerobic microorganisms attached to the contact materials 131 and 132 use the oxygen in the air to decompose organic pollutants contained in the water. The water treated in the contact filter bed tank 130 is transferred to the treated water tank 140 through an opening 107 that communicates between the bottom of the contact filter bed tank 130 and the bottom of the treated water tank 140.

[0028] The treated water tank 140 is a treatment tank (treatment area) that temporarily stores the water transferred from the contact filter bed tank 130 and separates solids such as sludge and suspended matter in the water by precipitating them. The treated water tank 140 is configured so that the water that flows in from an opening 107 at the bottom moves upward. The water stored in the treated water tank 140 is transferred to the disinfection tank 150. The transfer of water from the treated water tank 140 to the disinfection tank 150 may be performed by overflow or by a pump. The wastewater treatment device 10 may be configured so that a part of the water transferred to the treated water tank 140 can be returned to the inflow baffle 108 via a return path.

[0029] The disinfection tank 150 is a treatment tank (treatment area) for disinfecting the water transferred from the treatment water tank 140. The disinfection tank 150 is provided in an area above the treatment water tank 140. In this embodiment, the disinfection tank 150 includes two cartridges 180, 180 containing a disinfectant. The water transferred to the disinfection tank 150 is disinfected by the disinfectant and discharged from the outlet 103 to the outside of the wastewater treatment device 10. Note that the manhole opening 109a, which is one of the manhole openings 109, 109a, is provided above the disinfection tank 150.

[0030] The configuration of disinfection tank 150 will be described in detail with reference to Figures 2 to 4. Disinfection tank 150 of this embodiment includes a drug barrel arranging section 160 and a retention section 170 provided downstream of drug barrel arranging section 160. Drug barrel arranging section 160 and retention section 170 are partitioned by a partition wall (disinfection tank constituent wall) 151 and are integrally configured as a whole.

[0031] The cartridge arrangement section 160 is configured to be able to hold the cartridge 180 relative to the disinfection tank 150. The cartridge arrangement section 160 is provided directly below the manhole opening 109a on the upper side of the disinfection tank 150. The cartridge arrangement section 160 includes a recess 161 recessed downward, an upper wall 165 provided on the upper side of the recess 161, and an inlet 162. The inlet 162 is provided on the upstream side of the recess 161. The inlet 162 communicates between the treatment water tank 140 and the inside of the recess 161. A communication port (communication section) 163 with the retention section 170 is provided on the downstream side of the cartridge arrangement section 160.

[0032] As shown in FIG. 3, the upper wall 165 is formed with cartridge holder holes 166, 166 penetrating in the vertical direction. As shown in FIG. 4, the cartridge holder holes 166, 166 are formed so that cartridges 180, 180 can be inserted from above. The cartridge holder holes 166, 166 are provided directly below the manhole opening 109a. The cartridge holder holes 166, 166 are adjacent to each other. The cartridge holder holes 166, 166 are disposed between the inlet 162 and the outlet 163 in the front-rear direction. The cartridge holder holes 166, 166 are located on the path of water from the inlet 162 to the outlet 163. The water flowing into the recess 161 from the treatment water tank 140 through the inlet 162 comes into contact with the lower end 184 of the cartridge 180 on the path toward the outlet 163. This ensures contact between the water flowing into the recess 161 and the disinfectant, promoting disinfection of the water. The disinfected water temporarily stays in the recess 161 and then flows from the outlet 163 to the retention section 170 .

[0033] The retention section 170 is formed as a recessed space that is deeper in the vertical direction than the recessed portion 161, and is formed so as to be able to retain (store) water that flows in from the outlet 163. An outlet 171 is formed at the upper part of the retention section 170. The outlet 171 is connected to the outlet 103 of the wastewater treatment device 10. When the water level in the retention section 170 reaches the outlet 171, the water in the retention section 170 flows out of the wastewater treatment device 10 through the outlet 171 and the outlet 103.

[0034] 4 to 6, the drug barrel 180 will be described. The drug barrel 180 is formed into a cylindrical shape with a bottom as a whole. As shown in FIG. 5, the drug barrel 180 includes a main body portion 181, a dissolution amount adjustment portion 185, and a lid portion 191.

[0035] The main body 181 is formed in a cylindrical shape extending in the vertical direction. The main body 181 has an opening 182a on the upper side. In FIG. 5, the inside of the main body 181 is shown with a part of the cylindrical wall 181a constituting the main body 181 omitted. The main body 181 is configured to be able to accommodate a disinfectant 210 therein. In this embodiment, an operator can put the disinfectant 210 into the main body 181 from the opening 182a. In this embodiment, sodium hypochlorite is used as the disinfectant 210. In this embodiment, the disinfectant 210 is spherical (granular). The shape of the disinfectant 210 is not limited to granular, and may be, for example, tablet-shaped.

[0036] As shown in FIG. 4 to FIG. 6, the upper end portion 182 of the main body portion 181 is provided with through holes 183, 183. The through holes 183, 183 penetrate the main body portion 181 (the cylindrical wall 181a) in a direction perpendicular to the cylindrical central axis A1 of the main body portion 181. The two through holes 183, 183 are arranged symmetrically with respect to the axis A1 (a virtual plane P including the axis A1 and extending in the vertical direction). The diameter of the through holes 183, 183 is large enough to insert a hook-shaped portion 303 of the tool 300 described later. The diameter of the through holes 183, 183 is smaller than the diameter of the disinfectant 210. This prevents the disinfectant 210 from dropping from the main body portion 181 to the outside of the drug barrel 180 through the through hole 183. The diameter of the through hole 183 may be any value in the range of, for example, 10 mm or more and 30 mm or less. In this embodiment, the diameter of the through hole 183 is 20 mm.

[0037] The dissolution amount adjustment unit 185 is configured to be able to adjust the amount of dissolution of the disinfectant 210 in the main body 181. As shown in Fig. 5 and Fig. 6, the dissolution amount adjustment unit 185 is disposed at the lower end 184 of the main body 181. In this embodiment, the dissolution amount adjustment unit 185 includes a medicine barrel nozzle 186 and an adjustment skirt 188 disposed on the outer side of the medicine barrel nozzle 186.

[0038] The cartridge nozzle 186 includes a cylindrical side wall 186a disposed around the axis A1 and a bottom wall 186b perpendicular to the axis A1. A plurality of openings 187 are formed in the side wall 186a.

[0039] The adjusting skirt 188 is formed to be slightly larger than the cartridge nozzle 186, and is disposed outside the cartridge nozzle 186. The adjusting skirt 188 includes a cylindrical side wall 188a provided radially outside the side wall 186a, and a bottom wall 188b provided below the bottom wall 186b. The side wall 188a is provided with a plurality of openings 189. The positions (arrangement) of the plurality of openings 189 relative to the side wall 188a and the sizes of the plurality of openings 189 are the same as the positions (arrangement) and sizes of the plurality of openings 187 of the cartridge nozzle 186. The bottom wall 186b of the cartridge nozzle 186 and the bottom wall 188b of the adjusting skirt 188 are connected by a screw 190 so that the adjusting skirt 188 can rotate around the axis A1.

[0040] The exposed area of ​​the opening 187 of the cartridge nozzle 186 to the outside (recess 161) can be arbitrarily adjusted by rotating the adjustment skirt 188. Specifically, the exposed area of ​​the opening 187 to the outside is changed by an operator rotating the adjustment skirt 188 around the axis A1. The exposed area of ​​the opening 187 is also the area of ​​the portion where the inside of the main body 181 communicates with the recess 161. Of the disinfectant 210 contained in the cartridge 180, the disinfectant 210 near the opening 187 is placed in a state facing the outside and is allowed to come into contact with water. Therefore, when the exposed area of ​​the opening 187 increases, the dissolution of the disinfectant 210 is promoted. When the exposed area of ​​the opening 187 decreases, the dissolution of the disinfectant 210 is restricted.

[0041] In addition, in the cartridge 180, similar to the side walls 186a, 188a, a plurality of openings penetrating in the vertical direction may also be provided in the bottom walls 186b, 188b. The exposed area of ​​the opening in the bottom wall 186b to the outside may be changed together with the exposed area of ​​the opening 187 in the side wall 186a to the outside by rotating the adjustment skirt 188 around the axis A1.

[0042] 5, the lid portion 191 is configured to cover the upper end portion 182 of the main body portion 181. The lid portion 191 includes a lid main body 192, a knob portion 193 provided on the upper portion of the lid main body 192, and a string-like connecting portion 194 that connects the lid main body 192 and the main body portion 181. The lid main body 192 covers the upper end portion 182 and the opening 182a of the main body portion 181. The through-hole 183 provided in the upper end portion 182 is covered by the lid main body 192.

[0043] In the wastewater treatment device 10 described above, the disinfectant 210 in the cartridge 180 gradually decreases due to dissolution. Therefore, the worker (manager) is required to periodically replenish the disinfectant 210 and adjust the exposed area by rotating the dissolution amount adjustment unit 185. Therefore, the worker needs to remove the cartridge 180 from the manhole opening 109a at a predetermined timing. Hereinafter, a method of removing and installing the cartridge 180 in the wastewater treatment device 10 will be described with reference to FIG. 7.

[0044] First, the worker opens the manhole cover 201 on the upper side of the disinfection tank 150 (FIG. 7, step S10). As shown in FIG. 8, the manhole cover 201 has two locking recesses 202, 202 arranged opposite to each other and two locking parts 203, 203 arranged opposite to each other. The locking recesses 202, 202 are formed so as to be recessed downward and toward the center of the manhole cover 201. The locking parts 203, 203 are configured to be able to fix the manhole cover 201 to the manhole opening 109a. When the locking part 203 is rotated, the manhole cover 201 can be removed from the manhole opening 109a. In step S10, the worker inserts a flathead screwdriver into the groove 204 of the locking part 203 to rotate the locking part 203. The worker inserts a tool with a hook-shaped tip into the locking recesses 202, 202, and moves the manhole cover 201 from the manhole opening 109a. In this manner, the worker opens the manhole cover 201.

[0045] FIG. 9 shows an example of a tool 300 used to open the manhole cover 201. The tool 300 has a rod-shaped portion 301, a grip portion 302 provided at a first end 301a of the rod-shaped portion 301, and a hook (hook-shaped) portion 303 provided at a second end 302a of the rod-shaped portion 301. The tool 300 is also called a manhole handle. The rod-shaped portion 301, the grip portion 302, and the hook-shaped portion 303 are integrally formed. The grip portion 302 is formed so that an operator can hold it with his / her fingers. The hook-shaped portion 303 is formed so that it can be inserted into the locking recess 202. For example, an operator can move the manhole cover 201 using the two tools 300, 300. Specifically, the worker holds the grip portion 302 of one tool 300 with his left hand and the grip portion 302 of the other tool 300 with his right hand, and inserts the respective hook portions 303, 303 into the locking recesses 202, 202 to move the manhole cover 201 from the manhole opening 109a.

[0046] Next, the worker removes the cartridge 180 from the wastewater treatment device 10 (the tank body 101, the disinfection tank 150) (FIG. 7, step S20).

[0047] In addition, as a conventional method for removing the cartridge 180 from the wastewater treatment device 10, for example, a method is considered in which an operator extends his / her arm from the manhole opening 109a into the wastewater treatment device 10 (tank body 101) to grab the cartridge 180 and pull the cartridge 180 upward. However, in this method, the operator needs to put his / her arm from the manhole opening 109a on the ground to the inside of the tank body 101 underground, so that the operator may be forced into an awkward posture. Also, depending on the amount of disinfectant 210 in the cartridge 180, the weight of the cartridge 180 may be large and the removal work may not be easy. In particular, in areas where a high residual chlorine concentration value is required for the water to be discharged, the filling amount of the disinfectant 210 tends to increase and the cartridge 180 tends to become large in order to satisfy the concentration value. Therefore, the weight of the cartridge 180 may exceed 10 kg (kilograms), for example, and the removal work of the cartridge 180 may become more difficult.

[0048] Here, the positional relationship of the cartridges 180, 180 with respect to the manhole opening 109a above the disinfection tank 150 will be described. As shown in FIG. 10, the cartridge holding holes 166, 166 in which the cartridge 180 is installed are provided directly below the manhole opening 109a so that an operator can remove the cartridges 180, 180 from the wastewater treatment device 10. As described above, the cartridge holding holes 166, 166 are disposed between the inlet 162 and the outlet 163 in the front-rear direction so that the water flowing from the inlet 102 (inlet 162) to the outlet 103 (outlet 171) contacts the disinfectant 210 in the cartridges 180, 180. FIG. 10 shows the diameter R1 of one cartridge 180 and the diameter R2 of the manhole opening 109a. The diameters R1 and R2 satisfy the relationship of the following formula (1).

[0049] 0.30×R2≦R1≦0.45×R2...Equation (1)

[0050] In this embodiment, the diameter R2 of the manhole opening 109a is 450 mm, and the diameter R1 of the cartridge 180 is 170 mm. That is, the diameter R1 is 0.38 times the diameter R2. In addition, in this embodiment, two cartridges 180 are arranged in the disinfection tank 150. Therefore, when the inside of the tank body 101 is viewed from directly above the manhole opening 109a, the area occupied by the two cartridges 180 with respect to the manhole opening 109a is relatively large. In addition, the position (area) B1 and the position (area) B2 shown in FIG. 10 are considered as positions where the left and right hands of the operator grasp the cartridge 180. The positions B1 and B2 are positions in FIG. 10 where the distance (gap) G between the cartridge 180 and the manhole opening 109a is relatively secured. However, as described above, since the cartridges 180, 180 are disposed directly below the manhole opening 109a, the gap G between the manhole opening 109a and the cartridge 180 is relatively narrow. For example, in FIG. 10, the gap G between the position B2 and the manhole opening 109a is 50 mm to 90 mm. Therefore, when an operator grasps the cartridge 180 by hand and takes it out, it may be difficult for the operator to insert his / her hand into the gap G, or the operator may be forced to assume an awkward posture in order to insert his / her hand.

[0051] In this embodiment, in step S20, the worker inserts the hooked portions 303, 303 of the tools 300, 300 into the through holes 183, 183 of the cartridge 180 and moves the tools 300, 300 upward, thereby removing the cartridge 180 from the wastewater treatment device 10 (see FIG. 11). Specifically, the worker first removes the lid portion 191 from the main body portion 181. The worker may extend one hand from the manhole opening 109a into the wastewater treatment device 10 to remove the lid portion 191, or may remove the lid portion 191 by pinching the knob portion 193 of the lid portion 191 with a predetermined tool.

[0052] When the cover portion 191 is removed from the main body portion 181, the worker inserts the hook-shaped portions 303, 303 of the tools 300, 300 into the wastewater treatment device 10 through the manhole opening 109a. The width of the hook-shaped portion 303 (the length in the direction perpendicular to the extending direction of the rod-shaped portion 301) is shorter than the gap G. Next, the worker inserts the hook-shaped portions 303, 303 into the through holes 183, 183, respectively, and engages the tools 300, 300 with the main body portion 181. Then, the worker moves the tools 300, 300 upward to remove the cartridge 180 from the wastewater treatment device 10. Thus, in this embodiment, since the cartridge 180 has the through holes 183, 183, the hook-shaped portions 303, 303 can be engaged with the through holes 183, 183, and the cartridge 180 can be removed by the tools 300, 300. Therefore, the worker is not forced to take an awkward position such as inserting an arm into the wastewater treatment device 10 through the manhole opening 109a. Even if the gap G between the cartridge 180 and the manhole opening 109a is narrow, the tool 300 can be inserted into the gap G. Therefore, according to this embodiment, the work of removing the cartridge 180 can be facilitated.

[0053] The wastewater treatment device 10 shown in FIG. 11 is raised. The raised construction is a construction in which the tank body 101 is installed deeper than the ground surface to ensure the gradient of the piping, and the manhole neck 109b is extended from the manhole opening 109a to the ground surface. When the wastewater treatment device 10 is raised, the manhole cover 201 covers the upper end opening 109c of the manhole neck 109b. When the raised construction is performed, the distance from the ground surface to the cartridge 180 becomes longer compared to when the raised construction is not performed. Therefore, the removal work of the cartridge 180 may become more difficult. However, according to the present embodiment, since the cartridge 180 is provided with the through holes 183, 183, the worker can insert the hook-shaped parts 303, 303 into the through holes 183, 183 and remove the cartridge 180 by lifting the tool 300, 300 upward. Therefore, even in the wastewater treatment device 10 in which the height has been increased, the operation of removing the cartridge 180 can be facilitated.

[0054] When the drug barrel 180 is removed, the worker adjusts the drug barrel 180 (FIG. 7, step S30). Adjusting the drug barrel 180 includes at least one of adjusting the dissolution amount adjustment unit 185 and refilling the disinfectant 210, as necessary.

[0055] After adjusting the cartridge 180, the worker returns the cartridge 180 to the wastewater treatment device 10 (FIG. 7, step S40). The worker inserts the hooked portions 303, 303 of the tools 300, 300 into the through holes 183, 183 of the cartridge 180 to lock the cartridge 180 to the tools 300, 300. The worker holds the gripping portions 302, 302, moves the tools 300, 300 downward from the upper side of the manhole opening 109, and installs the cartridge 180 in the cartridge placement portion 160. When the worker inserts the cartridge 180 into the cartridge holding hole 166, he removes the hooked portions 303, 303 from the through holes 183, 183, and pulls the tools 300, 300 upward from the manhole opening 109. Thereafter, the worker closes the opening 182a of the main body 181 with the lid 191. In step S40, the through holes 183, 183 are also blocked by the lid 191 together with the opening 182a. The worker may insert one hand into the wastewater treatment device 10 through the manhole opening 109, pinch the knob 193 of the lid 191, and close the opening 182a with the lid 191. Alternatively, the worker may pinch the knob 193 of the lid 191 with a predetermined tool, and close the opening 182a with the lid 191. In this embodiment, steps S20 to S40 may be performed for one cartridge 180, or may be performed for both (two) cartridges 180, 180.

[0056] When the cartridge 180 is returned to the wastewater treatment device 10, the worker closes the manhole cover 201 (FIG. 7, step S50). The worker holds the gripping portion 302 of one tool 300 with the left hand and the gripping portion 302 of the other tool 300 with the right hand, and inserts the hook-shaped portions 303, 303 into the locking recesses 202, 202 to move the manhole cover 201 onto the manhole opening 109. The worker inserts a flathead screwdriver into the groove 204 of the locking portion 203 to rotate the locking portion 203. This causes the manhole opening 109 to be closed by the manhole cover 201. In this manner, the removal and installation of the cartridge 180 in the wastewater treatment device 10 is completed.

[0057] According to the wastewater treatment device 10 of the present embodiment described above, the cartridge 180 is disposed directly below the manhole opening 109a of the tank body 101, and the cartridge 180 has at least one through hole 183. Therefore, the hook-shaped portion 303 can be inserted into the through hole 183. Therefore, the worker can grasp the tool 300 having the hook-shaped portion 303, insert the tool 300 into the tank body 101 from the manhole opening 109a to engage the hook-shaped portion 303 with the through hole 183, and move the tool 300 upward to remove the cartridge 180 from the wastewater treatment device 10. As a result, according to the present embodiment, it is possible to provide a wastewater treatment device 10 in which the cartridge 180 can be easily removed.

[0058] In addition, since the cartridge 180 has two through holes 183, 183 symmetrical with respect to the axis A1, the operator can, for example, lock the hook portion 303 of the tool 300 held in the left hand to one through hole 183 and lock the hook portion 303 of the tool 300 held in the right hand to the other through hole 183, and move the tools 300 held in each hand upward. Therefore, the cartridge 180 can be more easily removed from the wastewater treatment device 10.

[0059] Furthermore, when moving the manhole cover 201, a manhole handle such as the illustrated tool 300 is generally used, and the worker can remove the cartridge 180 by engaging the hook-shaped part 303 of the tool 300 with the through hole 183 of the cartridge 180 and lifting it up. Therefore, the wastewater treatment device 10 of this embodiment has the advantage that it is not necessary to use a dedicated tool for removing the cartridge 180.

[0060] The correspondence between each component (feature) of the above embodiment and each component (feature) of the present disclosure or invention is shown below. However, each component of the embodiment is merely an example and does not limit each component of the present disclosure or invention. The wastewater treatment device 10 is an example of a "wastewater treatment device." The tank body 101 is an example of a "tank body." The inlet 102 and the outlet 103 are examples of an "inlet" and an "outlet", respectively. The manhole openings 109 and 109a are examples of "manhole openings." Disinfection bath 150 is an example of a "disinfection bath." The cartridge 180 is an example of a "cartridge." Disinfectant 210 is an example of a "disinfectant." The opening 182a is an example of an "opening" in the main body portion. The main body 181 is an example of a "main body." The lower end portion 184 is an example of the "lower end portion of the main body portion." The upper end portion 182 is an example of the "upper end portion of the main body portion." The openings 187 and 189 are examples of "exposure openings." The axis A1 is an example of the "axis of the main body." The through holes 183, 183 are an example of "at least one through hole." The lid portion 191 is an example of a "lid portion." The cartridge placement portion 160 and the cartridge holding holes 166, 166 are an example of a "cartridge placement portion." The dissolution amount adjusting unit 185 is an example of an "adjusting unit." The diameter R1 and the diameter R2 are examples of "diameter R1" and "diameter R2", respectively. Manhole cover 201 is an example of a "manhole cover." The locking recess 202 is an example of a "locking recess." Tool 300 is an example of a "tool." The rod-shaped portion 301 is an example of a "rod-shaped portion." The first end 301a and the second end 302a are examples of the "first end" and the "second end". Hook portion 303 is an example of a "hook portion."

[0061] The wastewater treatment device 10, the cartridge 180, and the method of removing the cartridge 180 in the above embodiment are exemplary, and the wastewater treatment device 10, the cartridge 180, and the method of removing the cartridge 180 according to the present disclosure are not limited to the exemplified methods of removing the wastewater treatment device 10, the cartridge 180, and the cartridge 180. For example, the following modifications can be added. In addition, at least one of these modifications can be adopted in combination with the wastewater treatment device 10, the cartridge 180, and the method of removing the cartridge 180 exemplified in the embodiment, and at least one of the features described in each claim.

[0062] The wastewater treatment device 10 may be configured such that the settling separation tank 110, the anaerobic filter bed tank 120, the contact filter bed tank 130, and the treated water tank 140 are separately constructed from the disinfection tank 150, and the treated water tank 140 and the disinfection tank 150 are connected by piping. The disinfection tank 150 in the above embodiment corresponds to the "disinfection tank" and "tank body" of the present disclosure or invention. Also, the inlet 162, the outlet 163, and the outlet 171 correspond to the "inlet" and "outlet" of the present disclosure or invention, respectively.

[0063] The diameter R1 of the barrel 180 may be larger than that of the above embodiment, so long as a gap G into which the hooked portion 303 of the tool 300 can be inserted is provided between the manhole opening 109a and the barrel 180. The number of barrels 180 arranged in the wastewater treatment device 10 may be one, or three or more.

[0064] The number of through-holes 183 provided in the cartridge 180 may be one, or may be three or more. In addition, the cartridge 180 does not have to include the lid portion 191.

[0065] In the method of the above embodiment (FIG. 7), the operator can also open the lid 191 of the cartridge 180 and refill the disinfectant 210 through the opening 182a without removing the cartridge 180. However, from the viewpoint of preventing the disinfectant 210 from dropping into the tank body 101, it is preferable that the cartridge 180 is removed from the wastewater treatment device 10.

[0066] The present disclosure is not limited to the above-mentioned embodiment, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention column can be appropriately replaced or combined to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if the technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0067] 10: wastewater treatment device, 101: tank body, 102: inlet, 103: outlet, 104: partition wall, 105: opening, 106: opening, 107: opening, 108: inlet baffle, 109: manhole opening, 109a: manhole opening, 109b: manhole neck, 109c: upper end opening, 110: sedimentation separation tank, 120: anaerobic filter bed tank, 121 : anaerobic filter bed, 130: contact filter bed tank, 131: contact material, 132: contact material, 133: aeration device, 140: treated water tank, 150: disinfection tank, 160: cartridge placement section, 161: recess, 162: inlet, 163: outlet, 165: upper wall, 166: cartridge holding hole, 170: retention section, 171: outlet, 180: cartridge, 181: main body, 181a: Cylinder wall, 182: upper end, 182a: opening, 183: through hole, 184: lower end, 185: melting amount adjustment part, 186: cartridge nozzle, 186a: side wall, 186b: bottom wall, 187: opening, 188: adjustment skirt, 188a: side wall, 188b: bottom wall, 189: opening, 190: screw, 191: lid part, 192: lid main body, 193: knob part, 194: connecting portion, 201: manhole cover, 202: locking recess, 203: locking portion, 204: groove, 210: disinfectant, 300: tool, 301: rod-shaped portion, 301a: first end portion, 302: gripping portion, 302a: second end portion, 303: hook-shaped portion, A1: shaft, B1: position, B2: position, G: gap, P: virtual plane, R1: diameter, R2: diameter

Claims

1. A wastewater treatment device, A tank body having an inlet into which water to be treated flows, an outlet into which treated water flows out, and a manhole opening provided on the upper side, A disinfection tank is included in the tank body, provided below the manhole opening, and configured so that water flows from the inlet to the outlet, The tank comprises at least one chemical container positioned directly below the manhole opening, The aforementioned at least one medicine container is A cylindrical main body having an opening on the top and configured to contain disinfectant inside, An exposed opening is provided at the lower end of the main body and is configured to expose the disinfectant contained in the main body from the main body, A wastewater treatment apparatus comprising: at least one through hole at the upper end of the main body portion that penetrates the main body portion in a direction intersecting the axis of the main body portion.

2. A wastewater treatment apparatus according to claim 1, A wastewater treatment apparatus wherein the at least one through hole is two through holes symmetrical with respect to the axis.

3. A wastewater treatment apparatus according to claim 1, A wastewater treatment apparatus comprising, for at least one medicine container, a lid portion that is detachably attached to the upper end of the main body portion and configured to cover the opening of the main body portion and the at least one through hole.

4. A wastewater treatment apparatus according to claim 1, The wastewater treatment apparatus comprises a disinfection tank located directly below the manhole opening, along the water flow path from the inlet to the outlet in the disinfection tank, and a chemical container arrangement section configured to hold at least one chemical container.

5. A wastewater treatment apparatus according to claim 1, A wastewater treatment apparatus comprising, the at least one chemical cartridge further comprising an adjustment unit configured to adjust the opening area at the exposed opening.

6. A wastewater treatment apparatus according to claim 1, A wastewater treatment apparatus in which the diameter of at least one through hole is 10 mm or more and 30 mm or less.

7. A wastewater treatment apparatus according to claim 1, The aforementioned at least one medicine container is actually two medicine containers, A wastewater treatment apparatus in which, when the diameter of at least one chemical container is R1 and the diameter of the manhole opening is R2, the diameters R1 and R2 satisfy the following formula (1). 0.30×R2≦R1≦0.45×R2...Formula (1)

8. A wastewater treatment apparatus according to claim 1, A drainage treatment apparatus comprising a manhole cover configured to be able to close the manhole opening, and further comprising a manhole cover having at least one locking recess that is exposed to the outside when the manhole opening is closed.

9. A chemical cartridge placed in a wastewater treatment device, A cylindrical main body having an opening on the top and configured to contain disinfectant inside, An exposed opening is provided at the lower end of the main body and is configured to expose the disinfectant contained in the main body from the main body, A medicine container comprising, at the upper end of the main body portion, at least one through hole that penetrates the main body portion in a direction intersecting the axis of the main body portion.

10. A method for removing a chemical cartridge from a wastewater treatment device, The wastewater treatment apparatus is A tank body having an inlet into which water to be treated flows, an outlet into which treated water flows out, and a manhole opening provided on the upper side, A disinfection tank is included in the tank body, provided below the manhole opening, and configured so that water flows from the inlet to the outlet, The tank comprises at least one chemical container positioned directly below the manhole opening, The aforementioned at least one medicine container is A cylindrical main body having an opening on the top and configured to contain disinfectant inside, An exposed opening is provided at the lower end of the main body and is configured to expose the disinfectant contained in the main body from the main body, The upper end of the main body portion includes at least one through hole that penetrates the main body portion in a direction intersecting the axis of the main body portion, The aforementioned method, A tool having a rod-shaped portion, a gripping portion provided at the first end of the rod-shaped portion, and a hook-shaped portion provided at the second end of the rod-shaped portion opposite to the first end is inserted into the tank body through the manhole opening. The hook-shaped portion is engaged with the at least one through hole provided in the at least one medicine container, A method of moving the tool upward to remove the at least one pill cartridge from the tank body.

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