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DE1,2(1.,341000;2.,610500):DE,DE,,(20%,80%),,:;DE;:X703.1:C:1000-4602(2005)10-0070-03DiscussionontheModifiedDEOxidationDitchProcessforNitrogenandPhosphorusRemovalXUJian2hong1,ZENGYan2(1.SchoolofEnvironmentalandArchitecturalEngineering,JiangxiUniversityofScienceandTechnology,Ganzhou341000,China;2.XinduJinhaiWastewaterTreatmentPlant,Chengdu610500,China)Abstract:ThemodifiedDEoxidationditchwasadoptedinXinduJinhaiWastewaterTreatmentPlant,thatis,ananoxictankandananaerobictankweresetupinfrontofDEoxidationditchforenhan2cingthephosphorusremoval.Inordertoavoidsludgebulking,abiologicalselectionareawasestablishedandtwopointsfeedingwasadoptedwith20%wastewaterintoanoxicareaand80%wastewaterintothebiologicalselectionarea.Theoperationresultshowsthattheprocessoperatesefficientlyandtheeffluentqualityreachestheprimarydischargestandard.Keywords:wastewatertreatment;DEoxidationditch;nitrogenandphosphorusremoval:(P)0.5mg/L,15mg/L,DE,1DE,,50%DEDE,,,20%,80%,11Fig.1Flowchartofwastewatertreatment072110200510CHINAWATER&WASTEWATERVol.21No.10Oct.2005111,,,DE(DO0.20.5mg/L),,20%2,,,20%,80%,DO,,(DO0.2mg/L),,,20%,,Carrousel,TP,,DO,,,11220%,(DO0.2mg/L,,,BOD,,,,,,,113,NPpHDE,80%,,DO,,,,,114DEDE,,,DE,4h(1)1Tab.1Workingconditionof4phases/h1.50.51.50.5:,,,,,(),(),1.5h:,,,,,0.5h:,,,,,(),(),1.5h:,,,,,0.5hDE,DE,,;,,,1710,:DE21(DO23mg/L);,,,62.5%2,BODCOD,:0.050.15kgBOD/(kgM2LVSSd),812h,1218d,90%,20004000mg/L,0.30.5m/s,23mg/L()0.20.5mg/L()0.2mg/L(),0.76h,0.17h,4.85h3BOT,20049,(2),2Tab.2TreatmenteffectofXinduJinhaiWastewaterTreatmentPlant/(mgL-1)/(mgL-1)/%CODSSNH3-NTPCODSSNH3-NTPCODSSNH3-NTP2004982.012913.80.7327.814.36.810.1766.188.950.776.720041070.112912.50.7327.814.36.810.1760.387.667.375.020041177.614314.80.6927.116.45.420.2965.187.768.862.320041288.513418.11.0327.116.45.420.2969.487.870.171.82005179.016314.11.1022.416.94.560.3271.689.667.770.92005281.715813.10.9425.415.64.660.3468.990.164.463.82005397.912617.21.1433.816.53.620.4265.586.979.063.22005497.714115.11.0326.814.42.020.3572.689.886.666.04,DE,:,;,DO;,,,;,(DO23mg/L);DE:[1].Carrousel[J].,2003,19(12):101-102.[2],.Carrousel[J].,2002,18(1):67-70.[3],,,.Carrousel2000[J].,2004,17(3):15-16.E-mail:mjgxs@vip.sina.com:2005-05-17271021