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2000m3/d4000m3/dBOD5=100mg/LCODcr=280mg/LSS=120mg/LNH3-N=30mg/LTP=3mg/LGB18918-2002ABOD510mg/LCODcr50mg/LSS10mg/LNH3-N5mg/LTP0.5mg/LCarrousel2000A2OAbstractTheprojectisadesignofTianlouTownsewegetreatmentplantinGuannanCounty,constructionoftwophases.Therecentdesignscaleis2000m3/dandthelong-termscaleis4000m3/d.Theinfluentqualityisshownasfollow:BOD5=100mg/L,CODcr=280mg/L,SS=120mg/L,NH3-N=30mg/L,TP=3mg/L.TheeffluentwaterqualityrequirestoreachthelevelofAdischargestandardsinemissionstandardofUrbansewagetreatmentplant(GB18918-2002),inwhichBOD510mg/L,CODcr50mg/L,SS10mg/L,NH3-N5mg/L,TP0.5mg/L.Bycomparingandanalyzingdifferentwastewatertreatmentprocessesathomeandabroad,combiningwiththespecificcircumstancesofthisproject,animprovedoxidationditchprocessischosenasthefinalprocessofthisproject.ThisprocesssetupananaerobiczoneinfrontoftheCarrousel2000oxidationditchandtheorganicmatter,nitrogenandphosphorusareremovedwiththewastewaterflowingthroughanaerobic,anoxicandaerobiczonealternatively.TheprocessnotonlyhasthecharacteristicsofA2O,butalsotheuniquewaterfeaturesoftheoxidationditch,whichisbenefitialtothebiologicalcoagulationofactivatedsludge.Inaddition,theprocessdonotneedtosetuptheearlypondandthesludgedigestiontank,thusitcansaveinvestment.Sewagetreatmentprocessis:inflowcoarsescreenwaterregulatingpool(sewageliftpump)finerackvortex-typegritchamberimprovedoxidationditchthesecondarysedimentationtankdisinfectiontankBaShimeteringtankeffluent.Sludgetreatmentprocessis:sludgepumpingroomsludgethickenersludgestoragetankplantandframefilterpresstransportofmudcake.KeyWords:municipalsewage;improvedoxidationditch;nitrogenandphosphorusremoval;sludgetreatment1.120152016-2025GB18918-2002ACODcrBOD5SSNH3-NTP280100120303501010580.5%82.190.091.783.383.31.21GN1565GN20455227251212084403.4621GN3-51.72GN13.82.1949.972401215.13.3/3GN5188.3145.41.675%79%71%31.3(1)(2)(3)(4)(5)CAD1.41(GB50014-2006)-20142(CECS138:2002)3(GB50032-2003)4(GB3838-2002)5(GB18918-2002)6(GB8978-1996)7(CJJ31-1989)1.53.2-3.813.9-3.2323.24-3.3114.1-4.2234.23-5.1535.15-6.126.1-6.712.1GB189182002ASBRCASSA2/O1Carrousel2000BOD95%99%COD95%90%50%95%2SBR90%75%-80%90%SBRCASSSBR3A/A/O80%-85%85%Carrousel2000Carrousel2000Carrousel20002.22.3CODcrBOD5SSNH3-NTPmg/Lmg/Lmg/Lmg/Lmg/L128010012030328010010830310%228010010830328010097.230310%328010097.230328514.584.51.590%95%85%85%50%428514.584.51.526.64.752.9164.51.55%5%80%BOD5CODcrSSNH3-NATP1.5mg/LTPCarrousel2000GB189182002A3.1120151.7420252.11GB50013-20062015110L/capd140L/capd20150.8020250.90201531=1.741100.81500m/Qd2025322.111400.92700/Qmd220152025103040m3/201520250.8020153310400.8320/Qmd20253430400.8960/Qmd320153515003201820/Qmd20153627009603660/Qmd201520252000m3/d4000m3/d20152016-2025Qad=2000m3/d41.1~1.5Kd=1.5Qd=QadKd=20001.5=3000m3/dQah=3000/24=125m3/h5Kz=1.93Qmax=QadKz=20001.93=3860m3/d=0.045m3/s3.23.2.1S=10mmb=20mmv2=0.65m/s=650h=0.35m33310.1/(10wmm)3.2.21nQmax=0.045m3/sh=0.35mv=0.65m/sb=20mm=650n=maxsinQbhv=0.045sin650.020.350.65=9.4n=10v=maxsinQbhn=0.045sin650.020.3510=0.61m/s0.61.0m/sB0.20.3m0.3mB=S(n-1)+bn+0.3=0.019+0.0210+0.3=0.59mB=0.6m2h1h2=h0kh0=2sin2gv=43bSh2:mh0mgm/s2k3=2.42h2=h0k=24/3()sin2Svkbg=2.424/30.01()0.0220.6129.8sin653=0.05m0.1m3Wm3/dW=max1864000.0450.18640010001.931000zQWK=0.2m3/d4GSHZW0(mm)W1(mm)W2(mm)W3(mm)(mm)H1(mm)H2(mm)GSHZ5008503406002029508005Hmh1=2.60mH=h+h1+h2=0.35+2.60+0.1=3.05m6LmL1B1=0.3m120v=max1QBh=0.0450.30.35=0.43m/s0.40.9m/sL1=110.60.32220BBtgtg=0.4mL2L2=12L=0.2mL=L1+L2+0.5+1.0+1+0.8tanHH1=h+h1=0.35+4.05=4.4mH1mLL=L1+L2+0.5+1.0+1+0.8tanHH1=h+h1=0.35+2.60=2.95mH1mL=0.4+0.2+0.5+1.0+2.95+0.8tan65=3.85m3.33.3.11T=4h2Q=3000m3/d=0.035m3/s3.3.21VV=QT=0.03543600=504m32h=2mA=V/h=504/2=252m2LB=11L=B=A=15.87m16mLBH=16m16m4.2mi=0.01328410.71.5m/s0.82.5m/s2Q=3860m3/d=160.8m3/h-2.75m3.07m0.18mH=2.75+3.07+0.18=6mQW(/h3m)(m)(/minr)(kW)(%)150QW140-7-5.5140714405.579.141m348W6W5046=3024W21.5KWKWAmmr/minKgQJB1.5/6-260/3-9801.5426098065W=1.521000504=5.95w23.43.4.1S=10mmb=10mmv2=0.65m/s=650h=0.35m33310.1/(10wmm)3.4.21nQmax=0.045m3/sh=0.35mv=0.65m/sb=10mm=650n=maxsinQbhv=0.045sin650.010.350.65=18.820v=maxsinQbhn=0.045sin650.010.3520=0.61m/s0.61.0m/sB0.20.3m0.3mB=S(n-1)+bn+0.3=0.0119+0.0120+0.3=0.69mB=0.7m2h2h2=h0kh0=2sin2gv=43bSh2:mh0mgm/s2k3=2.42h2=h0k=24/3()sin2Svkbg=2.424/30.01()0.0120.6129.8sin653=0.12m3Wm3/dW=3max1864000.0450.1864000.2/10001.931000zQWmdK4GSHZW0(mm)W1(mm)W2(mm)W3(mm)(mm)H1(mm)H2(mm)GSHZ600950440700108505005Hmh1=0.5mH=h+h1+h2=0.35+0.5+0.12=0.97H=1.0m6LmL1B1=0.3m120v=max1QBh=0.0450.30.35=0.43m/s0.40.9m/sL1=110.70.32220BBtgtg=0.55mL2L2=12L=0.27mL=L1+L2+0.5+1.0+1+0.5tanHH1=h+h1=0.35+0.5=0.85mH1mL=0.55+0.27+0.5+1.0+0.85+0.5+1.25tan65=3.52m3.53.5.112:343.5.21.0.3m/s0.15m/s2.30s3060s3.1.2m0.251m0.6m4.5.0.010.021Lv=0.25m/st=30sL=vt=0.2530=7.5m2AA=maxQv=0.0450.25=0.18m23Bh2=0.25mb=2Ah=0.72mb=0.75mn=2b=0.75mB=1.5m4VT=2dV=max68640010QXTKz=60.045302864001.9310=0.12m3TT=2dKZ=1.93XX=30m3/106m35V0V0=0.122=0.06m361a=0.25m55'3h=0.35ma=312tg60ha=20.350.2560tg=0.65mV0=22311(222)6haaaa=0.35620.652+20.650.25+20.252=0.076m30.06m37h30.