| 摘要 |
PROBLEM TO BE SOLVED: To provide a filtration tank made of concrete capable of easily attaching a screen to a desired position.SOLUTION: There is provided a filtration tank made of concrete which comprises: a floating filter medium layer consisting of a floating filter medium; a screen which is disposed on an upper side of the floating filter medium layer and prevents outflow of the floating filter medium; a raw water inflow port and a backwash effluent discharge port which are disposed on a lower side from the floating filter medium layer; and a filtrate water storage part provided on an upper side of the screen. Raw water is filtered by passing raw water flowed from the raw water inflow port in an upward flow through the floating filter medium layer and the resulting filtrate water is stored in the filtrate water storage part. The filtration tank made of concrete comprises: a reception part which is embedded on an inner peripheral surface of a lateral wall of the filtration tank made of concrete and forms an opening port extending substantially in the horizontal direction in at least a part of the inner periphery of the filtration tank made of concrete; and a plate-like screen fixing member having an insertion fitting part inserted into the opening port and a mounting part on which the screen is mounted. The screen is fixed to the mounting part of the screen fixing member insertion-fitted to the opening port. |
