| 摘要 |
A river is divided into a plurality of river sections via a plurality of partitions which are spaced apart along the direction of the flow of the river. Polluted water at or near the surface of the river from the river sections is pumped to water treating apparatuses without drawing the polluted water near the floor of the river. Suspension pollutants, including nitrogenous nutrients, are removed from the polluted water via filtration in the water treating apparatuses. After treatment, the treated water is sent to the river in such a manner that the water drawn from each river section is sent to another one of the river sections, that is located immediately downstream, at the same rate as the river flow and that the remaining portion of the treated water is sent back to the upstream river section from where the water comes. Successive removal of the suspension pollutants from the river sections results in releasing of nitrogenous nutrients from sludge on the floor of the river to upper parts of the river sections, thereby reducing the thickness of the sludge.
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