Biological Water Treatment by Alternating Continuous and Sequential Aeration
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Accused Products
Abstract
A water treatment method using a biological reactor to break down the nitrogen-based pollution contained in said water, said reactor comprising a biomass aerated by aeration means, said treatment comprising simultaneous nitrification/denitrification phases, characterized in that said treatment implements two aeration modes: a continuous aeration mode; a sequential aeration mode in which the aeration interruption is triggered when the ammonia concentration reaches a low predetermined threshold while the aeration is activated when the ammonia concentration reaches a high predetermined threshold, the switching from one aeration mode to the other being activated according to the nitrate concentration in said water, said continuous aeration mode being activated when said nitrate concentration reaches a low predetermined threshold, and said sequential aeration mode being activated when said nitrate concentration reaches a high predetermined threshold.
13 Citations
40 Claims
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1-10. -10. (canceled)
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11. A method for removing nitrogen from water comprising:
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predetermining a high and a low threshold value for nitrate concentration in water; predetermining a high and a low threshold value for ammoniac concentration in water; measuring the nitrate concentration in the water; activating a continuous aeration mode if the nitrate concentration reaches the predetermined low threshold value for the nitrate concentration, wherein the continuous aeration mode comprises; aerating the water such that nitrification and denitrification reactions occur simultaneously in the water; activating a sequential aeration mode if the nitrate concentration reaches the predetermined high threshold value for the nitrate concentration, wherein in the sequential aeration mode comprises; measuring the ammoniac concentration in the water; stopping aeration when the ammoniac concentration reaches the predetermined low threshold value for the ammoniac concentration; initiating aeration when the ammoniac concentration reaches the predetermined high threshold high for the ammoniac concentration; and maintaining the sequential aeration mode until the nitrate concentration reaches the predetermined low threshold value for the nitrate concentration and then activating the continuous aeration mode. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of biologically removing nitrogen from water by nitrifying and denitrifying the water, the method comprising:
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employing a continuous aeration mode and a sequential aeration mode wherein in the continuous aeration mode nitrifying and denitrifying reactions occur simultaneously in the water and wherein in the sequential aeration mode aeration is activated and deactivated; activating the continuous aeration mode when the nitrate concentration in the water reaches a predetermined low threshold; activating the sequential aeration mode when the nitrate concentration in the water reaches a predetermined high threshold; and wherein when in the sequential aeration mode, aeration is deactivated when the ammoniac concentration reaches a predetermined low threshold and aeration is activated when the ammoniac concentration reaches a predetermined high threshold. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification