| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for evaluating the water quality of a river, by each of which a quantitative variation of the water quality in which the water quality of the actual river is reflected faithfully can be predicted and the effect of a water purifying material or the like in the actual river can be grasped quantitatively. <P>SOLUTION: This method for evaluating the water quality of the river comprises the steps of: filtering the water taken from the river by a screen having 40-100μm mesh; throwing the filtered water in a closed-loop circulation type horizontal water route 1; circulating the thrown water at 5-20 cm/second flow velocity by a circulation pump 2; sampling the circulating water periodically; measuring indexes of nutritive salt and/or organic matter in the sampled water and; predicting the variation of the water quality of the actual river from the variations of these indexes. Otherwise, this method for evaluating the water quality of the river comprises the steps of: putting the water purifying material or the like in the circulation type horizontal water route; measuring indexes of nutritive salt and/or organic matter; calculating a difference of each of the indexes between when the water purifying material or the like is used and when the water purifying material or the like is not used and; predicting the variation of the water quality of the actual river from the calculated differences. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
