JP2012045459A5 - Natural equilibrium filtration apparatus and method with slow-down cleaning means - Google Patents

Description

The present invention solves the problems of the known technology, is easy to add functions to almost all existing filtration ponds, and is a slow-down cleaning means that can uniformly collect cleaning wastewater during slow-down. It is an object of the present invention to provide a natural equilibrium filtration apparatus and method including the above.

In order to solve the above problems, in the present invention, a filtration pond having a filter medium layer and a drain trough disposed above the filter medium layer, a communication path provided below the filter medium layer of the filter pond, and the communication A filtered water tank connected to the water purification tank by an outflow weir at the upper side connected to the passage, a drainage galit adjacent to the filtration pond and connected to the filtration pond at a position higher than the drainage trough, and a drainage tank connected to the drainage galit In the natural equilibrium filtration device for passing the water in the filtration basin through the drainage galit and guiding it to the drainage basin and backwashing the filter medium layer with filtered water, in the filtration pond, A drainage device that can uniformly collect water and wash the inside of the filtration basin in a slow-down manner at a position above the drainage trough at a position above the drainage trough is provided with the drainage trough and drainage pipe. Connect and drain the pipe Is obtained by a natural equilibrium type filtration apparatus characterized in that it is installed small drain valve.
In the natural equilibrium filtration device of the present invention, the drainage device can be a small drainage trough, a small drainage weir or a trumpet tube, and preferably has an adjustment mechanism for adjusting the position of the upper part, and the installation position thereof. Is preferably set at a position where the backwash flow rate during slowdown is 0.15 to 0.30 m / min, which is the speed at which the filter medium does not flow.
In the present invention, a filtration pond having a filter medium layer and a drainage trough disposed above the filter medium layer is connected to the communication path from the communication path provided below the filter medium layer of the filter pond. Drainage grit connected to the drainage galit and the drainage galit connected to the filtration basin at a position higher than the drainage trough adjacent to the filtration pond and passing the filtrated water through the filtration basin communicated with the water purification basin at the outflow weir. A natural equilibrium filtration method in which water in the filter basin is passed through the drainage galit and drained from the drainage basin, and the filter medium layer is washed back by filtered water in the natural equilibrium filtration method. The water is uniformly collected from a position above the drainage trough at a position above the drain trough, and the inside of the filtration basin is washed in a slow-down manner, and the filter medium layer is backwashed at a low speed. And then drain It was is obtained by a natural equilibrium shape filtering methods.
In the filtration method, the backwashing at a low speed is preferably performed so that the backwashing flow rate during the slowdown is 0.15 to 0.30 m / min, which is a speed at which the filter medium does not flow.

Claims (6)

  A filtration pond having a filter medium layer and a drainage trough disposed above the filter medium layer, a communication path provided below the filter medium layer of the filter pond, and an upper portion connected to the communication path to a purified water trough by an outflow weir A drainage gutter connected to the filtration pond at a position higher than the drainage trough adjacent to the filtration basin, and a drainage tub connected to the drainage galit, and draining the water in the filtration pond In a natural equilibrium filtration device that passes through a galit and leads to the drainage basin, and backwashes the filter medium layer with filtered water, the water surface of the filtration basin is located above the drainage trough in the filtration pond. At the lower position, a drainage device that can uniformly collect water and wash the inside of the filtration basin by a slow-down method is installed, the drainage device is connected to a drainage drainage pipe, and a small drainage valve is installed in the drainage pipe. Self characterized by The balanced filtration device.   2. The natural equilibrium filtration device according to claim 1, wherein the drainage device is a small drainage trough, a small drainage weir, or a trumpet pipe.   3. The natural equilibrium filtration device according to claim 2, wherein the drainage device has an adjustment mechanism for adjusting an upper position.   The installation position of the drainage device is a position where the backwash flow rate at the time of slowdown is a position where the speed at which the filter medium does not flow is 0.15 to 0.30 m / min. Natural equilibrium filtration device.   A filtration pond having a filter medium layer and a drainage trough disposed above the filter medium layer is connected to a purified water trough with an outflow weir from the communication path provided below the filter medium layer of the filter pond to the upper part connected to the communication path. Passing the filtered water through the connected filtered water tank, and having a drainage galit connected to the filtration pond at a position higher than the drainage trough adjacent to the filtration pond, and a drainage basin connected to the drainage galit, In the natural equilibrium filtration method in which the water in the filter basin is passed through the drainage galit and drained from the drainage basin, and the filter medium layer is washed back by filtered water to be washed, the wash water in the filter pond is Collect water uniformly from a position above the drainage trough at a position above the drain trough, wash the inside of the filtration basin by a slow-down method, and backwash the filter material layer at a low speed to drain the water. Characteristic natural equilibrium filter Method.   6. The natural equilibrium type according to claim 5, wherein the backwashing at low speed is performed so that the backwashing flow rate at the time of slowdown is 0.15 to 0.30 m / min which is a speed at which the filter medium does not flow. Filtration method.