Abstract
By treating real domestic sewage which is low C/N in A/O process ，results showed that different removal rates occured under different organic loadings、internal reflux ratio (R) without external carbon source . It was demonstrated that with the improvement of organic loading, F/M improved from 0.22kg/(kgMLSS•d) to 0.28kg/(kgMLSS•d), removal rates of TN and COD were improved by 4.84% and 16.55% respectively. Because lower C/N, TN and COD removal had no obvious enhancement by elevating R from 150% to 250% with organic loading is 0.28kg/(kgMLSS•d).
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