| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for cleaning lakes and marshes, efficiently removing nitrogen as a nutrient salt for the propagation of algae and suppressing the generation of sludge. <P>SOLUTION: In the method for cleaning lakes and marshes by cleaning raw water introduced from lakes and marshes, rivers, a basin, a reservoir or a moat and discharging the cleaned water to the lakes and marshes, the raw water is anaerobically treated in an anaerobic treatment tank 1 and subsequently aerobically treated in an aerobic treatment tank 3. A part of water to be treated in the aerobic treatment tank 3 is refluxed to the anaerobic treatment tank 1 and a part of activated sludge is drawn out of the aerobic treatment tank 3 or a rear stage sedimentation basin 5 to be returned to the anaerobic treatment tank 1 and a part of activated sludge different from a part of the activated sludge is drawn out to be subjected to solubilization treatment in a solubilization treatment tank 6 before returned to the anaerobic treatment tank 1. <P>COPYRIGHT: (C)2003,JPO</p> |
