Wastewater treatment apparatus for removing nitrogen and phosphorus and method therefor
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United States of America Patent
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Oct 31, 2000
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N/A
app pub date -
Jun 11, 1998
filing date -
Jun 12, 1997
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Abstract
A wastewater treatment apparatus for removing nitrogen and phosphorus contained in wastewater, and a method therefor. The wastewater treatment apparatus includes an anaerobic/anoxic reaction tank having multiple compartments partitioned by a plurality of partitions, each compartment receiving wastewater and a carbon source; an aeration tank for removing phosphorus by luxury uptake of phosphorus from the treated wastewater flowed from the last compartment of the anaerobic/anoxic reaction tank, using oxygen as an electron acceptor; and a settling tank for settling a sludge from the treated wastewater passed from the aeration tank, and returning the settled sludge into the anaerobic/anoxic reaction tank. The wastewater treatment apparatus can increase removal efficiencies of nitrogen and phosphorus contained in the wastewater, even at a low temperature. Also, the retention time in the reaction tank is reduced, so the size of the reaction tank is reduced, thereby lowering construction costs. Also, the wastewater treatment apparatus can be added to a general wastewater treatment apparatus, thereby nitrogen and phosphorus of wastewater can be completely removed or processed to have the desired water quality level.
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