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Membrane coupled activated sludge method and apparatus operating anoxic/anaerobic process alternately for removal of nitrogen and phosphorous

  • US 20070108125A1
  • Filed: 11/14/2005
  • Published: 05/17/2007
  • Est. Priority Date: 11/14/2005
  • Status: Active Grant
First Claim
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1. A membrane coupled activated sludge method operating anoxic/anaerobic processes alternately for removal of nitrogen and phosphorous being a method for advanced treating of a sewage, wastewater, filthy water etc. simultaneously treating nitrogen and phosphorous wherein an anoxic process, in which a denitrification reaction for removing nitrogen occurs, and an anaerobic process for releasing phosphorous are alternately carried out, the anoxic process comprising steps of:

  • (a) continuously flowing sewage, waste water, filthy water, etc. as an inflow water into an anoxic/anaerobic alternating-type reactor;

    (b) operating an internal recycle pump intermittently to internally recycle nitrate nitrogen occurring in an aerobic reactor continuously and thus to make the anoxic/anaerobic alternating-type reactor into anoxic condition;

    (c) converting and removing the nitrate nitrogen supplied through the internal recycle of the step (b) into nitrogen gas by using organics in the continuous inflow water as carbon source;

    (d) overflowing and moving the mixed solution denitrified in the step (c) into a continued aerobic reactor;

    (e) carrying out a nitrification process of converting organic nitrogen and ammonia nitrogen, which are supplied from the inflow water, into nitrate nitrogen with nitrification microbes and an organic oxidation process of decomposing remaining organics, under aerobic condition of the aerobic reactor in which continuous aeration is made by a blower; and

    (f) continuously discharging treated water by using a submerged-type separation membrane equipped in the aerobic reactor;

    the anaerobic process comprising steps of;

    (a′

    ) continuously flowing sewage, waste water, filthy water, etc. as an inflow water into the anoxic/anaerobic alternating-type reactor;

    (b′

    ) stopping the internal recycle pump, which is intermittently operated, to discontinue the internal recycle of the nitrate nitrogen occurring in the aerobic reactor and thus to make the anoxic/anaerobic alternating-type reactor into anaerobic condition;

    (c′

    ) inducing phosphorous release with microbes for removing phosphorous by using organics of the continuous inflow water as carbon source, under anaerobic state that the nitrate nitrogen is denitrified and depleted due to the interruption of the internal recycle in the step (b′

    );

    (d′

    ) overflowing and moving the microbes having released the phosphorous in the step (c′

    ) into the continued aerobic reactor;

    (e′

    ) lowering a concentration of dissolved phosphorous in the aerobic reactor through an excess phosphorus uptake of the phosphorus releasing microbes in the step (d′

    ) and simultaneously carrying out the nitrification process of converting organic nitrogen and ammonia nitrogen, which are supplied from the inflow water, into nitrate nitrogen by nitrification microbes and the organic oxidation process of decomposing remaining organics, under aerobic condition of the aerobic reactor in which continuous aeration is made by the blower;

    (f′

    ) continuously discharging treated water of which phosphorous is removed by using the submerged-type separation membrane equipped in the aerobic reactor; and

    (g′

    ) wasting sludge, in which phosphorous is excessively uptook in the step (e′

    ), to discharge the phosphorous; and

    wherein the anoxic and anaerobic processes in the anoxic/anaerobic alternating-type reactor are distinguished according to whether the internal recycle of the nitrate nitrogen by means of the internal recycle pump is performed.

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