| 摘要 |
<p>PCT No. PCT/DK89/00161 Sec. 371 Date Dec. 20, 1990 Sec. 102(e) Date Dec. 20, 1990 PCT Filed Jun. 27, 1989 PCT Pub. No. WO90/00157 PCT Pub. Date Jan. 11, 1990.A process and a plant for the purification of waste water wherein the waste water is alternatingly treated in the two treatment zones under anoxic and aerobic conditions and the waste water thus treated is subjected to an aerobic treatment in a separate zone before it is introduced into a clarification zone from which purified waste water and sludge is removed, at least a part of the sludge being recycled to the waste water which is introduced into one of the two treatment zones.</p> |
