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The effectiveness of RAS degradation under low dose ozone and effect of ozonated sludge on a full scale anaerobic–anoxic–aerobic (A/A/O) process were examined. The ratios of chemical oxygen demand (COD) to nitrogen and COD to phosphorus of ozonated sludge were 23 and 91 respectively on average, much higher than in influent. Compared with the performance of A/A/O process alone, COD removal efficiency...
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