1/531.1.1曝气生物滤池的设计与计算1曝气生物滤池体积V曝气生物滤池选用陶料滤料,容积负荷Nv选用334067.65363100065.2741014.71000mNQSVv设两组,每组3'34.3268267.65362mVV2曝气生物滤池面积A,滤料层高度mh4323'085.817434.3268mhVA分12个格,则2'10.6812085.817mA3滤池尺寸,滤池每格采用长方形,单个滤池边长为:289.683.83.8m。取滤池超高度1h为m5.0,清水层高度2h为m8.0,滤料高度3h为m4,承托层高度4h为m3.0,配水室5h高度为m2.1。则滤池高:mhhhhhH8.62.13.048.05.0543214水力停留时间t空床水力停留时间:hQVt10.1241014.734.3268244'实际停留时间:htt55.010.15.0'式中:——滤料层孔隙率,5.05校核污水水力负荷qNhmmdmmAQNq23234/64.3/38.87085.8171014.7符合过滤(水力负荷)满足一般要求hmm23/8~26需氧量DC型曝气生物滤池设计需氧量可用下列公式计算:BODXBODBODORS032.082.02/53式中:OR——单位质量的BOD需氧量,52/KgBODKgO;SBOD——滤池单位时间内去除可溶性BOD,Lmg/;BOD——滤池单位时间内进入的BOD,Lmg/;0X——滤池单位时间内进入的悬浮物,Lmg/;(1)可溶性BOD计算在C20下,一般有机物完全分解需d100左右,实际应用较为困难,d20得20BOD已完成了%90的uBOD,5BOD又完成了%80~%70的20BOD,因此可以说5BOD完成氧化分解有机物的大部分,而且BOD的污染考核指标也是5BOD,所以可以用5BOD值代入上式,近似计算OR值,然后可乘上4.1系数。设3.020K,0355.1,7.0SSVSS,5.055BODBOD进水总进水溶解性冬季C7时生化反应常数:20.0035.13.0207202010TKK出水SS中5BOD量:LmgeeXSSVSSSkeSS/6.12142.1207.0142.152.05出水溶解性5BOD量:LmgSe/4.76.1220去除溶解性5BOD:LmgBOD/93.1294.765.2745.05夏季C25时生化反应常数:36.0035.13.02025202010TKK出水SS中5BOD量:LmgeeXSSVSSSkeSS/6.16142.1207.0142.1536.05出水溶解性5BOD量:LmgSe/4.36.1620去除溶解性5BOD:LmgBOD/93.1334.365.2745.053/53(2)实际需氧量计算冬季需氧量计算520/518.0275.0112.032.0275.012993.082.032.082.0kgBODkgOBODXBODBODORS冬季实际需氧量:hkgOdkgOQSORAORO/3.593/302.142391014.7275.0518.04.14.1224夏季需氧量计算520/533.0275.0115.032.0275.013393.082.032.082.0kgBODkgOBODXBODBODORS夏季实际需氧量:hkgOdkgOQSORAORO/5.610/64.14651014.7275.0533.04.14.1224(3)标准需氧量换算。标准需氧量可按下式换算:200024.1TsmsCCCAORSOR式中:SOR——标准需氧量,hkgO/2;AOR——实际需氧量,hkgO/2;sC——标准条件下清水饱和溶解氧,Lmg/2.9;——大气压修正系数;——混合液中氧转移系数(LaK)与清水中LaK值之比,一般为85.0~8.0;——混合液饱和溶解氧与清水饱和溶解氧之比,一般为97.0~9.0smC——曝气装置在水下深度至水面平均溶解氧值,Lmg/;0C——混合溶液溶解氧值,Lmg/;T——混合液温度,C510026.242btTsmPOCC式中:TC——T温度时,清水饱和溶解氧浓度,Lmg/;tO——滤池逸出气体中含氧量,%;bP——曝气装置绝对压力,Pa;4/53%10012179121AAtEEO式中:AE——氧利用率,%;设曝气生物装置氧气利用率AE为%20,混合液剩余溶解氧0C为Lmg/3,曝气装置安装在水下面m9.4,17.127C,38.825C,取83.0,96.0,0.1,PahPOHb535351047.19.4108.9101108.91012%5.17%1002.0121792.0121tO冬季:LmgCsm/90.1310026.21047.1425.1717.1255hkgOCCCAORSORTsms/28.866024.139.130.196.083.02.99.593024.12207200夏季:LmgCsm/57.910026.21047.1425.1738.855hkgOCCCAORSORTsms/48.971024.1357.90.196.083.02.95.610024.122025200需要氧选用最大值:hkgO/97227需气量需气量为min/270/162002.03.09723.033mhmESORGAs曝气负荷校核:hmmAGNs23/61.192.82616200气8反冲洗计算采用气水联合反冲洗(1)空气反冲洗计算。选用空气冲洗强度hmmq23/40气,两组滤池轮流反冲洗,每组需气量:min/545/32683085.8174033mhmAqQ单气气(2)水反冲洗计算。选用空气冲洗强度hmmq23/25水,两组滤池轮流反冲洗,每组需水量:min/340/20427085.8172533mhmAqQ单水水5/53冲洗水量占进水水量比为:%3.14%10071400030340工作周期h24,水冲洗每次min30。9污泥估算在曝气生物滤池中,进水中被去除的悬浮物有一些不能被降解。污泥由两部分组成,一部分为SS,另一部分由消化BOD而产生VSS。(1)由SS产生的污泥量W1(含水率为99.6%)dmPCCQWssess/56.2536.99100100010002.0162.01014.710034001(2)消化BOD而产生的VSS量W2:根据经验数据,一般情况下,每去除1kgBOD,可产生0.05-0.1kgVSS,这里取X=0.08kgVSS/kgVBOD,则每天去除BOD量为:dkg/1820702.0275.01014.74,则曝气生物滤池的产BOD量为:)/(56.145608.018207dkgVSSy据VSS/SS=0.7,污泥含水率为99.6%,则dmW/2.520%6.99.110007.056.145632dm11曝气系统的设计计算(1)需氧量:hkgOdkgOQSORAORO/41.793/8.190411014.7275.0533.04.14.12242.(2)供氧量:设计计算水温为25摄氏度,设曝气生物装置氧气利用率AE为%20,混合液剩余溶解氧0C为Lmg/3,曝气装置安装在水下面m9.4,17.127C,38.825C,取83.0,96.0,0.1。PahPOHb535351047.19.4108.9101108.91012%5.17%10020.01217920.0121tOLmgCsm/57.910026.21047.1425.1738.8556/53hkgOCCCAORSORTsms/972024.139570.196.083.02.95.610024.1220252002(3)供风量:min/270/1620020.03.09723.033mhmESORGAs每池供氧量为hmmG/8100min/135'33(4)曝气空气管路计算如下表所示:7/53曝气空气管路计算表管段编号管段长度L(m)空气流量空气流速v(m/s)管径D(mm)配件管段当量长度管段计算长度压力损失m3/hm3/minh1+h2L0(m)L0+L(m)9.8(Pa/m)9.8(Pa)123456789101128~270.74.680.078---25直流等孔径三通1个0.220.920.800.7427~260.79.360.1565.30425三通1个0.220.922.602.3926~250.714.040.2347.9625三通1个0.220.925.805.3425~240.718.760.3134.1340三通1个,异形管1个0.971.670.911.5224~230.723.450.3915.5140三通1个0.381.081.391.5023~220.728.140.4693.9950三通1个,异形管1个1.261.960.631.2322~210.732.830.5474.6550三通1个0.381.080.840.9121~200.737.520.6255.3150三通1个0.381.081.091.1720~190.742.210.7045.9850三通1个0.381.081.371.4819~180.746.900.7823.1075三通个,异形管1个2.052.750.200.5518~170.751.590.8603.2475三通1个0.821.520.250.3817~160.256.250.9373.5375三通1个0.821.020.290.3016~150.7168.752.8135.96100四通1个,弯头1个,异形管1个,闸阀1个6.136.830.563.8215~142.1337.55.6255.27150四通1个,异形管1个,闸阀1个7.129.220.272.4914~132.1506.258.4477.96150四通个,闸阀1个4.276.370.583.6913~122.1675.0011.255.97200四通1个,异形管1个,闸阀1个10.0612.160.232.8012~1113.81350.0022.507.65250弯头1个,三通1个,异形管1个13.1426.940.287.5411~1012.62025.0034.1673.54450三通1个,异形管1个21.2933.890.031.0210~912.62700.0045.004.72450三通1个10.6423.240.051.169~812.63375.0056.255.90450三通1个10.6423.240.081.868~732.054050.0067.507.08450三通1个10.6442.690.114.708/53曝气空气管路计算表管段编号管段长度L(m)空气流量空气流速v(m/