脫氮除磷活性污泥法工藝計(jì)算

一、生物脫氮工藝設(shè)計(jì)計(jì)算,,,,,,,,

（一）設(shè)計(jì)條件：,,,,,,,,

,,,,,,,,,

設(shè)計(jì)處理水量Q＝,30000,m3/d=,1250.00,m3/h=,0.35,m3/s,,

總變化系數(shù)Kz=,1.42,,,,,,,

進(jìn)水水質(zhì)：,,,出水水質(zhì)：,,,,,

進(jìn)水CODCr=,350,mg/L,,CODCr=,100,mg/L,,

BOD5=S0=,160,mg/L,,BOD5=Sz=,20,mg/L,,

TN=,40,mg/L,,TN=,15,mg/L,,

NH4+-N=,30,mg/L,,NH4+-N=,8,mg/L,,

堿度SALK=,280,mg/L,,pH＝,7.2,,,

SS=,180,mg/L,,SS=Ce=,20,mg/L,,

VSS=,126,mg/L,,,,,,

f=VSS/SS=,0.7,,,曝氣池出水溶解氧濃度,,,2,mg/L

夏季平均溫度T1＝,25,℃,,硝化反應(yīng)安全系數(shù)K=,,,3,

冬季平均溫度T2＝,14,℃,,,,,,

活性污泥自身氧化系數(shù)Kd=,,0.05,,,,,,

活性污泥產(chǎn)率系數(shù)Y＝,,0.6,,,,,,

混合液濃度X＝,,4000,mgMLSS/L,SVI＝,150,,,

"20℃時(shí)反硝化速率常數(shù)qdn,20＝",,,0.12,kgNO3--N/kgMLVSS,,,,

曝氣池池?cái)?shù)n=,,2,,,,,,

若生物污泥中約含,,12.40%,的氮用于細(xì)胞合成,,,,,

（二）設(shè)計(jì)計(jì)算,,,,,,,,

1、好氧區(qū)容積V1計(jì)算,,,,,,,,

（1）估算出水溶解性BOD5（Se),,,,,,,,

,,,6.41,mg/L,,,,

（2）設(shè)計(jì)污泥齡計(jì)算,,,,,,,,

硝化速率,,,,,,,,

低溫時(shí)μN(yùn)(14)＝,,,0.247,d-1,,,,

硝化反應(yīng)所需的最小泥齡θcm=,,,4.041,d,,,,

設(shè)計(jì)污泥齡θc=,,,12.122,d,,,,

（3）好氧區(qū)容積V1,,,,,,,,

,=,,7451.9,m3,,,,

好氧區(qū)水力停留時(shí)間t1=,,,5.96,h,,,,

2、缺氧區(qū)容積V2,,,,,,,,

（1）需還原的硝酸鹽氮量計(jì)算,,,,,,,,

微生物同化作用去除的總氮,,,,=,7.11,mg/L,,

被氧化的氨氮＝進(jìn)水總氮量-出水氨氮量-用于合成的總氮量＝,,,,,24.89,mg/L,,

所需脫硝量＝進(jìn)水總氮量-出水總氮量-用于合成的總氮量＝,,,,,17.89,mg/L,,

需還原的硝酸鹽氮量NT＝,,,,,536.56,kg/d,,

"（2）反硝化速率qdn,T＝qdn,20θT-20＝",,,(θ為溫度系數(shù)，取1.08）,,0.076,kgNO3--N/kgMLVSS,,

（3）缺氧區(qū)容積V2＝,,,2534.1,m3,,,,

缺氧區(qū)水力停留時(shí)間t2=V2/Q=,,,2.03,h,,,,

3、曝氣池總?cè)莘eV＝V1+V2＝,,,9986.0,m3,,,,

系統(tǒng)總污泥齡＝好氧污泥齡+缺氧池泥齡＝,,,,16.24,d,,,

4、堿度校核,,,,,,,,

每氧化1mgNH4+-N需消耗,,7.14,mg堿度；,,,,,

去除1mgBOD5產(chǎn)生,,0.1,mg堿度；,,,,,

每還原1mgNO3--N產(chǎn)生,,3.57,mg堿度；,,,,,

剩余堿度SALK1=進(jìn)水堿度-硝化消耗堿度+反硝化產(chǎn)生堿度+去除BOD5產(chǎn)生堿度,,,,,,,,

,＝,181.53,mg/L>,100mg/L(以CaCO3計(jì)）,,,,

5、污泥回流比及混合液回流比,,,,,,,,

（1）污泥回流比R計(jì)算,,,,,,,,

,＝,8000,mg/L(r為考慮污泥在沉淀池中停留時(shí)間、池深、污泥厚度等因素的系數(shù)，取,,,,,1.2

混合液懸浮固體濃度X（MLSS）＝,,,4000,mg/L,,,,

污泥回流比R＝X/（XR-X)=,,,100%,(一般取50～100％）,,,,

（2）混合液回流比R內(nèi)計(jì)算,,,,,,,,

總氮率ηN＝（進(jìn)水TN-出水TN）/進(jìn)水TN＝,,,,62.50%,,,,

混合液回流比R內(nèi)＝,η/(1-η)=,,,167%,,,,

6、剩余污泥量,,,,,,,,

（1）生物污泥產(chǎn)量,,,,,,,,

,1525.498006,kg/d,,,,,,

(2)非生物污泥量PS,,,,,,,,

PS＝Q（X1-Xe）＝,1020,kg/d,,,,,,

(3)剩余污泥量ΔX,,,,,,,,

ΔX＝PX+PS＝,2545.498006,kg/d,,,,,,

設(shè)剩余污泥含水率按,,99.20%,計(jì)算,,,,,

,,,,,,,,,

7、反應(yīng)池主要尺寸計(jì)算,,,,,,,,

（1）好氧反應(yīng)池,,,,,,,,

設(shè),2,座曝氣池，每座容積V單＝V/n=,,,3725.96,m3,,

曝氣池有效水深h=,,,,,4,m,,

曝氣池單座有效面積A單＝V單/h=,,,,,931.49,m2,,

采用,3,廊道，廊道寬b=,,,6,m,,

曝氣池長(zhǎng)度L＝A單/B=,,,,,51.7,m,,

校核寬深比b/h=,,,,,1.50,,,

校核長(zhǎng)寬比L/b=,,,,,8.62,,,

曝氣池超高取,1,m，曝氣池總高度H=,,5,m,,,

,,,,,,,,,

（2）缺氧池尺寸,,,,,,,,

設(shè),2,座缺氧池，每座容積V單＝V/n=,,,1267.05,m3,,

缺氧池有效水深h=,,,,,4.1,m,,

缺氧池單座有效面積A單＝V單/h=,,,,,309.04,m2,,

缺氧池長(zhǎng)度L＝好氧池寬度＝,,,,,18.0,m,,

缺氧池寬度B＝A/L=,,,,,17.2,m,,

8、進(jìn)出水口設(shè)計(jì),,,,,,,,

（1）進(jìn)水管。兩組反應(yīng)池合建，進(jìn)水與回流污泥進(jìn)入進(jìn)水豎井，經(jīng)混合后經(jīng)配水渠、,,,,,,,,

進(jìn)水潛孔進(jìn)入缺氧池。,,,,,,,,

單組反應(yīng)池進(jìn)水管設(shè)計(jì)流量Q1＝,,,0.347,m3/s,,,,

進(jìn)水管設(shè)計(jì)流速v1=,,0.8,m/s,,,,,

進(jìn)水管管徑d1=,,0.743,m,取d1=,0.7,m,,

校核管道流速v=Q/A,=,0.902,m/s,,,,,

（2）回流污泥入口：,,,,,,,,

設(shè)計(jì)流量Q2=Q=,,0.347,m3/s,,,,,

污泥回流渠道設(shè)計(jì)流速v2=,,0.7,m/s,,,,,

渠道斷面積A＝QR/v2=,,0.496,m2,,,,,

渠道斷面b×h=,1,×,0.5,m,,,,

校核流速v=,,0.694,m/s,,,,,

（3）進(jìn)水豎井,,,,,,,,

進(jìn)水孔過(guò)流量：Q'＝（1+R）×Q/n＝,,,,0.347,m3/s,,,

孔口流速v'=,,0.6,m/s,,,,,

孔口過(guò)水?dāng)嗝娣eA'=Q'/v'=,,0.579,m2,,,,,

,,,,,,,,,

(4)出水堰及出水豎井,,,,,,,,

矩形堰流量公式：,,,,,,,,

出水流量Q3=,,0.347,m3/s,,,,,

堰寬b=,,6,m,,,,,

堰上水頭H=,,0.099,m,,,,,

出水孔孔口流速v3=,,0.6,m/s,,,,,

孔口過(guò)水?dāng)嗝娣eA3=,,0.579,m2,,,,,

(5)出水管。,,,,,,,,

管道流速v4=,,0.8,ms/,,,,,

管道過(guò)水?dāng)嗝娣eA4=,,0.434,m2,,,,,

出水管管徑d4=,,0.743,m,取d4=,0.7,m,,

校核管道流速v=,,0.902,m/s,,,,,

9、設(shè)計(jì)需氧量AOR=碳化需氧量+硝化需氧量-反硝化脫氮產(chǎn)氧量＝,,,,,,,,

(去除BOD需氧量-剩余污泥中BOD氧當(dāng)量)+(氨氮硝化需氧量-剩余污泥中氨氮的氧當(dāng)量),,,,,,,,

-,反硝化脫氮產(chǎn)氧量,,,,,,,

（1）碳化需氧量D1：,,,,4576.27,kgO2/d,,,

(2)硝化需氧量D2＝4.6Q(N0-Ne)-4.6×12.4%×PX=,,,,3834.19,kgO2/d,,,

（3）反硝化脫氮產(chǎn)生的氧量D3＝2.86NT＝,,,,1534.57,kgO2/d,,,

（4）總需氧量AOR＝D1+D2-D3＝,,,,6875.89,kgO2/d＝,286.50,kgO2/h,

（5）最大需氧量AORmax=KzAOR=,,,,9754.96,kgO2/d＝,406.46,kgO2/h,

去除1kgBOD的需氧量＝,,,,1.64,kgO2/kgBOD5,,,

,,,,,,,,,

（6）標(biāo)準(zhǔn)需氧量,,,,,,,,

氧總轉(zhuǎn)移系數(shù)α＝,,,,0.85,,,,

氧在污水中飽和溶解度修正系數(shù)β＝,,,,0.95,,,,

曝氣池內(nèi)平均溶解氧濃度C＝,,,,2,mg/L,,,

所在地區(qū)大氣壓力p=,,,,101300,Pa,,,

因海拔高度不高引起的壓力系數(shù)ρ＝p/101300=,,,,1.00,,,,

曝氣池水深H=,,,4,m,,,,

曝氣頭距池底距離,,,0.2,m,,,,

曝氣頭淹沒(méi)深度＝,,,3.8,m,,,,

曝氣頭處絕對(duì)壓力pb=p+9800H=,,,138540,Pa,,,,

曝氣頭氧轉(zhuǎn)移效率EA=,,,20%,,,,,

氣泡離開水面時(shí)含氧量Qt=,,,,17.54%,,,,

夏季清水氧飽和度CS(25)=,,,8.38,mg/L,,,,

Cs(20)=,,,9.17,mg/L,,,,

冬季清水氧飽和度Cs(10)＝,,,11.33,mg/L,,,,

曝氣池內(nèi)平均溶解氧飽和度,,,,9.12,mg/L,,,

夏季平均標(biāo)準(zhǔn)需氧量SOR(25)=,,,,412.04,kg/h,,,

最大時(shí)標(biāo)準(zhǔn)需氧量SORmax=,,,,584.56,kg/h,,,

夏季平均空氣用量QF(25)＝SOR(25)/0.3/EA=,,,,6867.28,m3/h=,114.45,m3/min,

最大空氣用量Qmax=,,,,9742.75,m3/h=,162.38,m3/min,

（7）所需空氣壓力p（相對(duì)壓力）,,,p=h1+h2+h3+h4+Δh,,,,,

h1：,供風(fēng)管道沿程阻力,,,0.001,MPa,,,

H2：,供風(fēng)管道局部阻力,,,0.001,MPa,,,

h3：,曝氣器淹沒(méi)水頭,,,0.038,MPa,,,

h4：,曝氣器阻力，取,,,0.004,MPa,,,

Δh：,富余水頭取,,,0.005,MPa,,,

p=,,,,0.049,MPa=,49,Kpa,

（8）曝氣器數(shù)量計(jì)算,,,,,,,,

A、按供氧能力計(jì)算,,,,,,,,

曝氣器供氧能力qc：,,,0.14,kgO2/(h·個(gè)),,,,

曝氣器數(shù)量n1=SORmax/qc=,,,4175,個(gè),,,,

B、以曝氣器服務(wù)面積校核,,,,,,,,

單個(gè)曝氣器服務(wù)面積f=F/n1=,,,0.598,m2<0.75,m2,,,

（9）供風(fēng)管道計(jì)算,,,,,,,,

A、干管。供風(fēng)干管采用環(huán)狀布置,,,,,,,,

流速v=,10,m/s,,,,,,

管徑d=,0.415,m,取DN=,400,mm,,,

B、支管。單側(cè)供氣支管（布?xì)鈾M管）,,,（向單側(cè)廊道供氣）,,,,,

支管空氣流量Q=,1623.791301,m3/h,,,,,,

流速v=,10,m/s,,,,,,

管徑d=,0.240,m,取DN=,250,mm,,,

,,,,,,,,,

雙側(cè)供氣（向兩側(cè)廊道供氣）,,,,,,,,

支管空氣流量Q=,3247.582602,m3/h,,,,,,

流速v=,10,m/s,,,,,,

管徑d=,0.339,m,取DN=,35