曝气生物滤池设计1曝气生物滤池滤料体积30120024096100010003vQSVmNBOD容积负荷选3KgdmBOD35,采用陶粒滤料,粒径5mm。2滤料面积滤料高度取h3=2m2396482VAmh滤池采用圆形,则滤池直径mAd52.214.35441,取2.5m取滤池超高h1=0.5m,布水布气区高度h2=1.0m,滤料层上部最低水位h4=1.0m,承托层高h5=0.3m滤池总高度H=5.8m3水力停留时间空床水力停留时间1203241.21200VthQ实际水力停留时间210.51.20.6tth4校核污水水力负荷32321200602.520qQNmmdmmhA5需氧量OR=)(32.0)(82.05BODXBODBODO△设3.0)20(LaK,8.0MLSSMLVSS,7.0BODBOD55进水总进水溶解性)20T()La(20La(T)024.1KK4.0024.10.3K)2028(La(28)出水SS中BOD含量:LmgeeXMLSSMLVSSSLaKess5.19)1(42.1208.01(42.154.05)28(出水溶解性BOD5含量Se=50-19.5=30.5mg/L去除溶解性BOD5的量:LmgBOD5.745.301507.05单位BOD需氧量:52/60.015.009.032.015.00745.082.0KgBODKgOOR实际需氧量:hKgOdKgOQSORAOR/6.1/8.3730015.06.04.14.12206标准需氧量换算设曝气装置氧利用率为EA=12%,混合液剩余溶解氧C0=2mg/L,曝气装置安装在水面下4.2m,取α=0.8,β=0.9,Cs=7.92mg/L,ρ=1PaHPPb53531042.12.4108.910013.1108.9%3.19%100)1(2179)1(21AAtEEQLmgQPCCtbssb/2.9)423.1910026.21042.1(92.7)4210026.2(555标准需氧量:hKgOCCCAORSORTTsbs/4.2024.1]22.99.0[8.02.96.1024.1][2)2028()20()()20(供气量:min1.17.66103.01004.23.033mhmESORGAs曝气负荷校核:hmm6.135.247.66AG22s气N满足要求。7反冲洗系统采用气水联合反冲洗(1)空气反冲洗计算,选用空气反冲洗强度hmm5423气qminm4.4hm9.2645.2454AqQ332气气(2)水反冲洗计算,选用水反冲洗强度hmm2523水qminm0.2hm7.1225.2425AqQ332水水冲洗水量占进水量比为:%10300150.2工作周期以24h计,水冲洗每次15min曝气装置与反冲进气管合用选用穿孔曝气管,穿孔管孔眼直径为3mm,孔距70mm,设支管管径为20mm,支管间距取80mm,经计算共需支管48根,枝状布置。孔口向下倾斜45°,曝气管布置在滤板上100mm处。设曝气管干管内空气流速为v1=12m/s曝气干管管径:mvGd044.01214.336007.6643600412,取φ57×3.5m承托层采用砾石,分为3层布置,从上到下第一层砾石粒径3mm,层厚100mm,第二层粒径6mm,层厚100mm,第三层粒径12mm,层厚100mm。8布水设施滤池布水系统选用管式大阻力配水系统,干管进口流速sm0.12,支管进口流速sm0.23,支管间距0.20m,配水孔径mmd94,配水孔间距80mm。干管管径mQd067.00.114.336005.1243600422设支管的管径为20mm,经计算共需支管20根,支管实际间距0.209m,支管实际流速为sm99.102.014.310360025.6423。9出水装置出水堰为齿形三角堰,堰口角度90°,齿高50mm,齿宽100mm,共80个齿,水面位于齿高1/2处,出水槽宽200mm,高800mm.10泥量估算曝气生物滤池污泥产率Y=0.75kg/kgBOD产泥量:dkgSSYQWe/5.2210)50150(30075.0)(3011管道计算设进水管流速为1.0m/s,管径mD067.00.114.324360030041,取φ76×4mm设出水管流速为0.8m/s管径mD074.08.014.324360030042,取φ89×4.5mm反冲洗进水管流速为2.5m/s管径mD132.05.214.336007.12243,取φ150×4.5mm反冲洗进气管流速为15m/s管径mD079.01514.336009.26444,取φ89×4.5mm排污管流速为1.2m/s管径mD190.02.114.336007.12245,取φ212×6mm