| 摘要 |
A method and a plant for waste water treatment. A method for purifying waste comprising the steps: a) storing waste water; b) optionally removing phosphorous compounds; c) leading the waste water to a first aerated biodegrading zone ( 7 ); d) leading waste water from the first aerated to a second aerated biodegrading zone to obtain purified water ( 12 ); e) leading purified water to at least step a) or to step b) if step b) is present has the advantage that production of H 2 S is kept at a minimum, that the necessary amount of chemicals used in phosphorous removal is reduced, that an improved nitrification occurs and that the purification is improved during start up after a longer break.
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