| 摘要 |
<p>In a method for purifying and clarifying waste water, the waste water is passed through a conventional mechanical-biological clarification plant (1, 9, 12) and thereafter ammonia contained in the waste water is oxidised to nitrate in a nitrification stage (14) and thereafter the nitrate is reduced to gaseous nitrogen in a denitrification stage (15), the stages (14 and 15) being separated from one another, the waste water passing successively through such stages directly or indirectly, and the nitrification stage and the denitrification stage being operated in accordance with the immersion percolating filter body method, in which the growth surfaces of the filter bodies are at least half immersed in the waste water and rotate. <IMAGE></p> |
