| 摘要 |
PROBLEM TO BE SOLVED: To provide a washing treatment apparatus capable of washing efficiency by eliminating clogging and stagnation.SOLUTION: A washing treatment apparatus comprises an introduction passage 69 that leads dirty sand to a lower portion in a tank 8, sewage discharge means, washing water supply means, suspended matter discharge means, and washed sandy mud discharge means. The inside of a treatment tank 7 includes a flotation pipe 57 that has a vertically cylindrical shape and forms a contact flotation passage 58 inside thereof and a precipitation passage 70 outside thereof, upper upward flow generating means that supplies air into the flotation pipe, separation promoting pieces 99, a control screen 110 that restricts passage of the separation promoting pieces and permits passage of sandy mud, a flotation promoting pipe that is inserted through a through hole of the control screen in the form of a vertically cylindrical shape and whose lower end opening faces the inside of a narrowed lower portion of the treatment tank and whose upper end opening faces the inside of a lower end opening of the flotation pipe, and lower upward flow generating means that supplies air into the flotation promoting pipe. In the lower portion of the treatment tank, an inspection hole 137 is configured to be openable and closable by a closing lid and the control screen is configured to be taken in and out through the inspection hole.SELECTED DRAWING: Figure 4 |
