| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a waste water purifying apparatus in which sewage from a building or a multiple-family dwelling, domestic waste water, industrial waste water, or the like, is purified effectively at a low cost so that the purified water is used as regenerated water and the recovered sludge is used effectively at a low cost as manure for farming land and the generation of gaseous carbon dioxide is restrained. <P>SOLUTION: Waste water is purified by separating/removing large organic matter having ≥0.5 mm particle size in the waste water by using a screen having about 0.5-1.0 mm mesh, adding a flocculant such as ferric polysulfate and aluminum polychloride to the organic matterremoved waste water to flocculate tainting particles into flocks and removing the flocks by precipitating them, filtering them by using another screen having about several tens μm mesh or adding another flocculant, magnetic powder and a macromolecular flocculant to the flock-containing waste water to transform them into magnetic flocks and separating the magnetic flocks magnetically. At this step, the tainting sludge having ≥0.1 μm particle size is removed and the dissolved phosphorus is also removed by transforming it into iron phosphate chemically. A decomposing unit is combined with this waste water purifying apparatus for decomposing at ≤200°C the sludge recovered at this step, namely, when the filtration, the flocculation and the magnetic separation are performed. <P>COPYRIGHT: (C)2004,JPO |
