| 摘要 |
<p>A method of treatment of municipal waste-waters from which coarse impurities have been removed using anaerobic treatment process and a carrier, consists in that after removal of insoluble substances in the first stage, the municipal waste-water is treated stepwise in at least three next stages (2, 3, 4) by anaerobic treatment comprising attached biomass with a hydraulic retention time of 6 to 48 hours, and subsequently it is subjected to oxic treatment process (6) with a hydraulic retention time of 0.2 to 12 hours, while the anaerobic and oxic removal take place in the presence of a biomass carrier having a specific surface of 60 to 500 m<2>/m<3>. The municipal waste-water proceeds through the individual stages of the anaerobic process either from below upwards or from above downwards. At the oxic treatment biomass is intensively aerated with pressure air, and after the oxic treatment the waste-water may be, together with the built-up biomass, recycled into at least one of the anaerobic stages.</p> |
