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Abstract
Denitrifying phosphate accumulating (DNPA) was investigated by controlling the concentration of nitrate in anoxic stage with batch experiments. A linear relationship between the quantity of phosphorus uptaken and the consumption of nitrate was shown under anoxic condition with the same concentration of carbon source. Based on the slope of the line between phosphorus release quantity and nitrate consumption, nitrate concentration was adjusted in the anoxic stage. Excellent DNPA performance had been achieved rapidly. The removal efficiency of phosphorus was above 95%, and nitrate more than 96%. According to the maximum phosphorus uptake rate of anoxic or aerobic, it was calculated that the percent of DNPAOs to PAOs was increased from 22% to 79% after cultivation.
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