Abstract:

Combined with the characteristics of spiral upflow reactor（SUFR）system, the nutrient removal of the SUFR system with a prolonged sludge age was analyzed through test comparison The operation of the SUFR system（θ_c=32 d）showed that the effluent COD was less than 40 mg·L^-1 and the effluent TN was less than 10 mg·L^-1The removal of TP in the SUFR system（θ_c=32 d）was less than 1 mg·L^-1, although the decrease of TP removal coupled with a longer sludge age was observedThe specific oxygen utilization rate (SOUR) of the SUFR system（θ_c=32 d）was in the range of 10～18 mg·g^-1·h^-1The results of CFD simulation showed that the volume ratio of plug flow reactors in the flow model was estimated to be about 63%, showing that the major flow pattern of the spiralup flow reactor was plug flowIt was indicated that the negative effect of a longer sludge age was compensated by the hydraulic characteristics of the SUFR, which was similar to plugflowreactorThe optimal sludge age range of the SUFR system could be wider.