| 摘要 |
A plant (1) serving the purpose of purification of contaminated waste water (14), the solid substances being removed mechanically, and particular and/or dissolved substances are removed by precipitation. The plant comprises one, mainly U-shaped, flow duct (12) for the water, a number of endless bandpass filters (15, 16, 17) placed in the duct for successively removal of solid substances and precipitated particular and/or dissolved substances. After the bandpass filters there is in the duct placed an ozone purification unit (5) especially for removal of organic substances and a UV-section (6) for succeedingly photochemical treatment of the water. In the duct there is next placed a ion exchange section (7) for removal of nitrates and an ion exchange section (8) for removal of salts. The purified water has a quality of drinking water. For many purposes it is possible to take out purified water, which has not gone through the whole process. The water is purified in the plant so quickly that there is no time for secondary reactions to emerge, which undesired might develop for example ammonia, phosphorus compounds and hydrogen sulphides. Furthermore, the plant takes up remarkably little ground space, which is only a fraction of the space for a conventional plant. |
