Patent ID: 6258274
Filing Date: 2001-07-10
Classification: B01D,C02F,E02B,Y02A,Y02W,Y10S

Abstract:
A method for reducing the thickness of sludge deposited on the floor of a river, comprising;(a) dividing the river into a plurality of river sections and blocking water from flowing between adjacent river sections by using a plurality of partitions which are spaced apart at intervals along the direction of water flow of the river;(b) providing a plurality of water treating apparatuses for respectively treating polluted water drawn from the river sections;(c) pumping the polluted water at or near the surface of the river from each of the river sections to the corresponding one of the water treating apparatuses without drawing the polluted water near the floor of the river;(d) removing fine suspension pollutants including nitrogenous nutrients from the polluted water via filtration carried out by the water treating apparatuses; and(f) returning the water treated by the water treating apparatuses to the river in such a manner that the water drawn from each of the river sections is sent to another one of the river sections that is located immediately downstream;whereby the sludge on the floor of the river can release nitrogenous nutrients to upper parts of the river sections, and the thickness thereof can be reduced.