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<br />~. <br />l <br />AwT-5 <br />The City of Phoenix 91st Avenue VVWTP (153 MGD) was required to produce less than 10 <br />mg/L TN. The second ant ~ consists of five plants and Punt IIiA (30 MGD) was <br />converted to an innovative aerated an+~ac-off fiawsheet v~ich was capable t~ produdng a <br />BODE s d mg/L, TSS s 8 mglL and TN s 8 mglL why processing 30-35 MGD ~ 5.5-G.0 day <br />SRT. The other four s are to be converted to the same novel design. <br />The Santa Fe (6 MGD) NcbN fac~ity was an 18A failure (Barrier Oxidation [itch) and the <br />aeration modifications roqu~ed n~noving 509b of the aeration capadty from operation while <br />maintaining neon and' p~tial ttitrogen removal. The innovative aerated anoxic process <br />was installed in the anoxic basiras and the plant st 1?.0°iG6 of design and with 50% of the <br />aeration basins on-line produced an effiueM of 6 mg/L BODSi 14 mg/L TSS and 8 mg/L TN. <br />The secondary treatment plant Iles had serious problems of bulking sludge and poor <br />darifx~ion as well as industrial wastes and sp~is from Pearl Harbor and Hickam AFB. The <br />pM.mt was required to n3duce TIV to s 10 mglL and the process design employed is the aerated <br />anoxic concept:' <br />The AVVWTP providing NdeN and phosphorus removal was visited and the performance <br />analyzed. The question of the roasonable level of effluent TP was reviewed Wised on the <br />avaiU~ble literature. Recommendations for improving BioP functions, reducing chemical <br />requirements and TP limitations were developed. <br />Evaluation of the historical openat~n and development of process reconfiguration to control <br />buNdng sludge and prodtace ~ efltt of s 10 mg/L TN. The process design chosen was the <br />novel aerated anoxic prods employed at Phoenix and Santa Fe. <br />