JP-2024160541-A5 -

Dates

Publication Date

20260511

Application Date

20230501

Description

A third aspect of the present disclosure provides a method for removing a chemical cylinder from a wastewater treatment device. The wastewater treatment device comprises a tank body, a disinfection tank, and at least one chemical cylinder. The tank body comprises an inlet into which water to be treated flows and an outlet out which treated water flows out. The tank body further has a manhole opening provided on its upper side. The disinfection tank is contained within the tank body. The disinfection tank is provided below the manhole opening. The disinfection tank is configured such that water flows from the inlet to the outlet. The at least one chemical cylinder is placed in the disinfection tank directly below the manhole opening. The at least one chemical cylinder has a cylindrical body portion, an exposed opening, and at least one through hole. The body portion has an opening on its upper side. The body portion is configured to accommodate a disinfectant inside. The exposed opening is provided at the lower end of the body portion. The exposed opening is configured to expose the disinfectant contained in the body portion from the body portion. The at least one through hole penetrates the main body at the upper end of the main body in a direction intersecting the axis of the main body. The method is to (i) insert a tool having a rod-shaped portion, a gripping portion provided at a first end of the rod-shaped portion, and a hook-shaped portion provided at a second end of the rod-shaped portion opposite to the first end into the tank body through the manhole opening; (ii) engage the hook-shaped portion with the at least one through hole provided in the at least one pill cylinder; and (iii) move the tool upward to remove the at least one pill cylinder from the tank body. The disinfection tank 150 is a treatment tank (treatment area) for disinfecting water transferred from the treatment water tank 140. The disinfection tank 150 is located in the area above the treatment water tank 140. In this embodiment, the disinfection tank 150 is equipped with two chemical cartridges 180 containing disinfectant. The water transferred to the disinfection tank 150 is disinfected by the disinfectant and discharged to the outside of the wastewater treatment device 10 from the outlet 103. One of the manhole openings 109, 109a, manhole opening 109a, is located above the disinfection tank 150. The chemical cartridge holder section 160 is configured to hold the chemical cartridge 180 relative to the disinfection tank 150. The chemical cartridge holder section 160 is located directly below the manhole opening 109a on the upper side of the disinfection tank 150. The chemical cartridge holder section 160 comprises a recess 161 that is recessed downwards, an upper wall 165 provided above the recess 161, and an inlet 162. The inlet 162 is located on the upstream side of the recess 161. The inlet 162 connects the treated water tank 140 to the inside of the recess 161. On the downstream side of the chemical cartridge holder section 160, there is a communication port ( outlet ) 163 with the retention section 170. Figure 9 shows an example of a tool 300 used to open a manhole cover 201. The tool 300 has a rod-shaped portion 301, a gripping portion 302 provided at the first end 301a of the rod-shaped portion 301, and a hook-shaped portion 303 provided at the second end 301b of the rod-shaped portion 301. The tool 300 is also called a manhole handle. The rod-shaped portion 301, the gripping portion 302, and the hook-shaped portion 303 are integrally formed. The gripping portion 302 is formed so that a worker can grasp it with their fingers. The hook-shaped portion 303 is formed so that it can be inserted into a locking recess 202. A worker can move the manhole cover 201 using, for example, two tools 300, 300. Specifically, the worker grasps the gripping portion 302 of one tool 300 with their left hand and the gripping portion 302 of the other tool 300 with their right hand, and inserts the respective hook-shaped portions 303, 303 into the locking recesses 202, 202 to move the manhole cover 201 out of the manhole opening 109a. Here, the positional relationship of the chemical cartridges 180, 180 with respect to the manhole opening 109a above the disinfection tank 150 will be explained. As shown in Figure 10, the chemical cartridge holding holes 166, 166 in which the chemical cartridges 180 are installed are located directly below the manhole opening 109a so that workers can remove the chemical cartridges 180, 180 from the wastewater treatment device 10. Also, as described above, the chemical cartridge holding holes 166, 166 are positioned between the inlet 162 and the outlet 163 in the front-to-back direction so that water flowing from the inlet 102 (inlet 162) to the outlet 103 (outlet 163, 171) comes into contact with the disinfectant 210 inside the chemical cartridges 180, 180. Figure 10 shows the diameter R1 of the chemical cartridge 180