| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a water treatment apparatus and method which maintains both activity of DPAO and quality of treated water in the AN method.SOLUTION: A water treatment apparatus includes an anaerobic tank 1 into which raw water flows, a sludge separation tank 2 which separates an activated sludge mixed liquor flowing out from the anaerobic tank 1 into a supernatant liquid and concentrated sludge, a nitrification tank 3 which treats the supernatant liquid, an anoxic tank 4 into which the concentrated sludge and outflow water from the nitrification tank 3 flow, and an aerobic tank 5 into which outflow water from the anoxic tank 4 flows. The water treatment apparatus is provided with water quality measuring means 16, 18 which measure an index of the nitrate nitrogen concentration in the inflow water and the outflow water of the anoxic tank 4, and first air volume control means 19 which calculates the nitrate nitrogen concentrations in the inflow water and the outflow water of the anoxic tank 4 from the index measured by the water quality measuring means 16, 18 and controls the aeration air volume of the nitrification tank 3 using the calculated nitrate nitrogen concentrations.</p> |
