The composition of sludge extracellular polymers and the relationship of sludge performance in each reaction stage of the A/O all reflux with some reflow process are explored.The concentration of sludge extracellular polysaccharide polymer and protein were determined by anthrone-sulfuric acid method and coomassie brilliant blue method respectively.The result showed that there is no rule existed between the flocculation settleability of sludge and the volume of polysaccharide protein.However,it is influenced...