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四、曝气池,,,,,,,,,
,,,,,,,,,,
1.设计条件,,,,,,,,,
,,,,,,,,,,
曝气池采用平均日流量作为设计基准,并配合检验尖峰小时流量时情形。,,,,,,,,,
依平均日质量平衡计算结果,初沉池出流水性质:,,,,,,,,,
Q=,"24,459",CMD,,,,,,,
TSS=,"2,069",Kg/d=,84.6,mg/L,,,,,
BOD5=,"3,530",Kg/d=,144.3,mg/L,,,,,
TP=,183.8,Kg/d=,7.5,mg/L,,,,,
依尖峰小时质量平衡计算结果,初沉池出流水性质:,,,,,,,,,
Q=,"48,763",CMD,,,,,,,
TSS=,"4,138",Kg/d=,84.9,mg/L,,,,,
BOD5=,"7,062",Kg/d=,144.8,mg/L,,,,,
TP=,367.6,Kg/d=,7.5,mg/L,,,,,
二沉池设计面积:,,,,,,,,,
二沉池面积=,,"1,257",m2=,"13,526",ft2,,,,
,,,,,,,,,,
2.计算结果摘要,,,,,,,,,
,,,,,,,,,,
回流污泥(RAS),,,,,,,,,
Q=,3.95,MGD=,"14,962",CMD,,,,,
废弃污泥(WAS),,,,,,,,,
Q=,287.5,CMD=,0.076,MGD,,,,,
TSS=,"2,300",Kg/d,,,,,,,
BOD5=,"2,002",Kg/d,,,,,,,
反应槽出流水,,,,,,,,,
Q=,"38,581",CMD,,,,,,,
TSS=,"3,107",mg/L,,,,,,,
二沉池出流水,,,,,,,,,
Q=,"23,331",CMD=,6.16,MGD,,,,,
TSS=,20.0,mg/L,,,,,,,
总非溶解性BOD5=,,,6.7,mg/L,,,,,
溶解性BOD5=,,,1.8,mg/L,,,,,
总磷=,,,0.5,mg/L,,,,,
,,,,,,,,,,
3.设计生物反应槽,,,,,,,,,
,,,,,,,,,,
(1)原进流水水质特性基本假设,,,,,,,,,
"(参考""Theory,DesignandOperationofNutrientRemoval-ActivatedSludge",,,,,,,,,
"Process""一书)",,,,,,,,,
,,,,,,,,,,
A.污染负荷,,,,,,,,,
平均日流量时:,,,,,,,,,
流量,Qin,MGD,,,,6.46,=,"24,459",CMD,,
BOD5,lb/d,,,,"7,777",=,144.3,mg/L,,
总悬浮固体物,TSS,lb/d,,,,"4,558",=,84.6,mg/L,,
总凯氏氮,TKN,lb/d,,,,"2,156",=,40.0,mg/L,,
总磷,TP,lb/d,,,,404.9,=,7.5,mg/L,,
碱度,lb/dasCaCO3,,,,"10,779",=,200.0,mg/L,,
硫化氢,lb/d,,,,53.9,=,1.0,mg/L,,
尖峰小时流量时:,,,,,,,,,
流量,Qin,MGD,,,,12.88,=,"48,763",CMD,,
BOD5,lb/day,,,,"15,560",=,144.8,mg/L,,
总悬浮固体物,TSS,lb/d,,,,"9,117",=,84.9,mg/L,,
总凯氏氮,TKN,lb/d,,,,"4,298",=,40.0,mg/L,,
总磷,TP,lb/d,,,,810.1,=,7.5,mg/L,,
碱度,lb/dasCaCO3,,,,"21,489",=,200.0,mg/L,,
硫化氢,lb/d,,,,107.4,=,1.0,mg/L,,
B.进流水质特性,,,,,,,,,
"总BOD/BOD5,R1=",,,,1.47,,,,,
"难分解性总凯氏氮(%),TKN1=",,,,4.0,,,,,
"难分解溶解性COD(%),COD1=",,,,12.50,,,,,
总悬浮固体物(TSS),,,,,,,,,
,"挥发性固体物(VSS)(%),VSS1",,,,,,75.0,,
,"难分解之挥发性固体物(%),VSS2",,,,,,40.0,,
,"VolatilecontentofnonbiodegradableVSS(%),VSS3",,,,,,90.0,,
,"COD/VSS,R2",,,,,,1.42,,
,"VSS之氮含量(%,N/VSS),N1VSS",,,,,,8.0,,
,"VSS之磷含量(%,P/VSS),P1VSS",,,,,,1.0,,
"COD/BOD之估计值,R3",,,,,,,2.21,,
"溶解性BOD5/总BOD5之估计值(%),R4",,,,,,,75,,
初沉池中各污染物去除率:,,,,,,,,,
"TSS去除率(%),RTSS",,,,,,,60,,
"BOD5,RBOD=RTSSx进流水TSS/进流水BOD5xVSS1x(1-VSS2)xR2/R1=",,,,,,,,28.3,
"总凯氏氮,RTKN=RTSSx进流水TSS/进流水TKNxVSS1xN1VSS=",,,,,,,,19.0,
"总磷,RTP=RTSSx进流水TSS/进流水TPxVSS1xP1VSS=",,,,,,,,11.3,
(2)曝气池中之生化反应机制常数及水质特性,,,,,,,,,
,,,,,,,,,,
A.喜气槽,,,,,,,,,
μmax20=,,10.0,day-1,,Φforμmax20=,,1.04,,,
μmaxT=,,8.42,day-1,,,,,,
Ks=,,50.0,mg/L,,,,,,
Yg=,,0.73,mgTSS/mgBOD5,,,,,,
Kd20=,,0.23,day-1,,ΦforKd20=,,1.04,,,
KdT=,,0.19,day-1,,,,,,
"挥发性TSS(%),VSS4=",,,,,,90.0,,,
"难分解性VSS(%),VSS5=",,,,,,23.0,,,
"VSS之氧当量数(mgCOD/mgVSS),CODVSS=",,,,,,1.42,,,
"VSS中之氮含量(%,N/VSS)N2VSS=",,,,,,12.0,,,
"BOD5/总磷(mgBOD5/mgTP-P),R5=",,,,,,15.0,,,
,,,,,,,,,,
B.硝化槽,,,,,,,,,
μmaxT=,,0.28,day-1,,,,,,
Kn=,,0.40,mg-N/L,,,,,,
KDO=,,1.30,mg/L,,,,,,
Yn=,,0.15,mgTSS/mgNO3,,,,,,
KdnT=,,0.05,day-1,,,,,,
"挥发性TSS(%),VSS6=",,,,,90.0,,,,
"VSS中之氮含量(%,N/VSS),N3VSS=",,,,,12.0,,,,
"VSS中之磷含量(%,P/VSS),P3VSS=",,,,,2.0,,,,
"硝化菌之MCRT,MCRTN=",,,,4.3,day,,,,
,,,,,,,,,,
C.硝化作用,,,,,,,,,
单位需氧量(mgO2/mgNO3generated)=,,,,,4.60,,,,
碱度消耗量(mgasCaCO3/mgNO3)=,,,,,7.20,,,,
,,,,,,,,,,
D.脱硝作用,,,,,,,,,
单位需氧量(mgO2/mgNO3denitrified)=,,,,,2.86,,,,
碱度产生量(mgasCaCO3/mgNO3)=,,,,,3.60,,,,
,,,,,,,,,,
E.硫化氢氧化作用,,,,,,,,,
单位需氧量(lbO2/lbH2S)=,,,,,2.00,,,,
(3)操作参数,,,,,,,,,
由于设计一VIP生物处理法所须考虑之设计参数相当多,除一般活性,,,,,,,,,
污泥法所常采用之MLSS、F/M及HRT外,尚考虑硝化液回流率(NRCY),,,,,,,,,,
厌气池回流率(ARCY),回流污泥(RAS)等,西图公司以多年发展VIP系统,,,,,,,,,
之经验,建议各参数之设计准则如下:,,,,,,,,,
,,,,,,,,,,
F/M(kgTBOD/kgMLVSS-day),,,,0.1~0.2,,,,,
SRT(days),,,,5~15,,,,,
MLSS(mg/L),,,,2000~3500,,,,,
HRT(hours),,,,,,,,,
,,厌氧槽,,1.00,,,,,
,,缺氧槽,,1.00,,,,,
,,好氧槽,,4.0~10.0,,,,,
,,合计,,6.0~12.0,,,,,
RAS(%),,,,40~80,,,,,
NRCY(%),,,,100,,,,,
ARCY(%),,,,50~100,,,,,
,,,,,,,,,,
A.基本设计条件假设,,,,,,,,,
依据民治污水处理厂的背景条件,假设各项操作参数如下。,,,,,,,,,
水中溶氧=,,2.0,mg/L,细胞停留时间(MCRT)=,,,10,天,
pH=,,7.20,units,水温=,,,15,℃,
MLSS=,,"3,000",mg/L,好氧槽脱硝率ANR=,,,10,%,
废弃污泥浓度,,"8,000",mg/L,NRCY=,,,120,%,
,,,,,,,,,,
B.反应槽体积计算,,,,,,,,,
依前述设计准则,假设,,,,,,,,,
好氧槽之HRT=,,6.0,hours,,,,,,
缺氧槽之HRT=,,1.0,hours,,,,,,
厌氧槽之HRT=,,1.0,hours,,,,,,
则可得,,,,,,,,,
好氧槽总体积(AERVol),,,,,,,,,
=,QinxTAER,,,,,,,,
=,6.46,MGDx,6.0,hours,,,,,
=,1.62,MG,,,,,,,
缺氧槽总体积(ANXVol),,,,,,,,,
=,QinxTANX,,,,,,,,
=,6.46,MGDx,1.0,hours,,,,,
=,0.27,MG,,,,,,,
厌氧槽总体积(ANAVol),,,,,,,,,
=,QinxTANA,,,,,,,,
=,6.46,MGDx,1.0,hours,,,,,
=,0.27,MG,,,,,,,
,,,,,,,,,,
已知初沉池出流水=,,,"24,459",CMD,,,,,
RAS=,(QinxMLSS-Q2ndxBODout-QwasxWAS)/(WAS-MLSS),,,,,,,,
=,3.73,MGD=,"14,122",CMD,,,,,
总进流量=,,"24,459",CMD+,"14,122",CMD,,,,
=,,"38,581",CMD=,10.19,MGD,,,,
选择反应槽池数=,,4,池,,,,,,
选择反应槽水深=,,6.0,m,,,,,,
,,,,,,,,,,
已知各槽体之体积如下:,,,,,,,,,
总体积(TOTVol)=,,,,2.15,MG=,"8,153",m3,,
好氧槽总体积(AERVol)=,,,,1.62,MG=,"6,115",m3,,
厌氧槽总体积(ANAVol)=,,,,0.27,MG=,"1,019",m3,,
缺氧槽总体积(ANXVol)=,,,,0.27,MG=,"1,019",m3,,
选择四个反应槽总宽度=,,,,32.0,m,,,,
每一反应槽宽度=,,,32.0,m/,4,=,8.0,,
选择反应槽的渠道数=,,,1,,,,,,
每一渠道宽度=,,,8.0,m/,1,=,8.0,m,
每一反应槽之好氧槽长度=,,,,,,,,,
=,"6,115",m3/,6.0,m/,8.0,m/,4,,
=,31.8,m,,,,,,,
选择好氧槽之长度=,,,28.0,m,,,,,
好氧槽每一分区长度=,,,28.0,/,4,=,7.0,m,
缺氧槽及厌氧槽长度,,,,,,,,,
=,"1,019.1",m3/,6.0,m/,4.0,m/,12,,
=,3.5,m,,,,,,,
选择厌氧槽或缺氧槽之长度为,,,,3.5,m,,,,
每一反应槽总长度=,,,,,,,,,
=,28.0,m+,3.5,m+,3.5,m+,3.5,m,
=,38.5,m,,,,,,,
每一渠道长度=,,38.5,m/,1,=,38.5,m,,
,,,,,,,,,,
厌氧槽总体积(ANAVol),,,,,,,,,
=,3.50,mx,4.00,mx,6.00,mx,12,,
=,"1,008",m3=,0.27,MG,,,,,
缺氧槽总体积(ANXVol),,,,,,,,,
=,3.50,mx,4.00,mx,6.00,mx,12,,
=,"1,008",m3=,0.27,MG,,,,,
好氧槽总体积(AERVol),,,,,,,,,
=,7.00,mx,8.00,mx,6.00,mx,16,,
=,"5,376",m3=,1.42,MG,,,,,
反应槽总体积(TOTVol),,,,,,,,,
=,"7,392",m3=,1.95,MG,,,,,
,,,,,,,,,,
Check:,,,,,,,,,
厌氧槽之HRT=,,,ANAVol,/Qin=,0.99,hours,,OK!,
缺氧槽之HRT=,,,ANXVol,/Qin=,0.99,hours,,OK!,
好氧槽之HRT=,,,AERVol,/Qin=,5.27,hours,,OK!,
反应槽之总HRT=,,,,,7.25,hours,,OK!,
MLSS=(TotalTSSxMCRT)/(8.34xTotalVol),,,,,,,,,
=,"3,107",mg/L,,,,,,,
(其中TotalTSS系指废弃污泥中之TSS量,请见4.固体物产量),,,,,,,,,
F/M=BODLoading/(TOTVolxMLSS)=,,,,,,0.11,,OK!,
缺氧槽之F/M=,,0.81,day-1,,,,,,
好氧槽之MCRTAER=(AERVol/TOTVol)xMCRT=,,,,,,,7.27,Days,
,,,,,,,,,,
C.脱氮计算,,,,,,,,,
"脱氮速率常数(SpecificDenitrificationRate,SDRN)系指单位时间之单",,,,,,,,,
位MLSS所能去除之氮量,其计算式为:,,,,,,,,,
SDNR20=0.03xF/M+0.029(在20oC下),,,,,,,,,
SDNRT=SDNR20x1.06(T-20),,,,,,,,,
因此本反应槽之SDNR15=,,,,1.87,mg/g/hr,,,,
,,,,,,,,,,
NOX-N(mg/L)浓度计算:,,,,,,,,,
无脱硝反应时DNo,,,,,,,,,
=,(1+MCRTxKdnT)xnitrifierTSS/(Qinx8.34xYn)=,,,,,,20.2,,
"(其中NitrifierTSS系指废弃污泥中由硝化反应产生之TSS量,请见(4)固体",,,,,,,,,
物产量),,,,,,,,,
考虑好氧槽脱硝反应时DN1,,,,,,,,,
=,(1-ANR)xDNo=,,,18.2,,,,,
考虑缺氧槽脱硝反应时,,,,,,,,,
=,DN1-SDNRxANXHRTxMLSS/1000=,,,,,12.4,,,
考虑回流NRCY时,,,,,,,,,
=,DN1/(1+RAS/Qin+NRCY/100)=,,,,8.3,,,,
,,,,,,,,,,
D.回流污泥量计算,,,,,,,,,
已知假设回流污泥浓度=,,,,"8,000",mg/L,,,,
RAS=,(QinxMLSS-Q2ndxBODout-QwasxWAS)/(WAS-MLSS),,,,,,,,
=,3.95,MGD=,"14,962",CMD,,,,,
Area=,"13,526",ft2,,SOR=,477.7,CMD/m2,,,
RASCap=,,3.60,mgd,=,19.4,,,,
SLR=,12.4,lb/sf-day,,,,,,,
=,2.52,Kg/m2-hr,,,,,,,
,,,,,,,,,,
(4)固体物产量,SOLIDSPRODUCTION(lb/d),,,,,,,,,
,,,,,,,,,,
A.初沉污泥,PrimarySludge,,,,,,,,,
TSS=进流水TSSxRTSS,,,,,,,,,
=,"6,834",lb/d=,"3,107",Kg/d,,,,,
VSS=进流水TSSxRTSSxVSS1,,,,,,,,,
=,"5,126",lb/d=,"2,330",Kg/d,,,,,
生物可分解性VSS=进流水TSSxRTSSxVSS1x(1-VSS2),,,,,,,,,
=,"3,075",lb/d=,"1,398",Kg/d,,,,,
,,,,,,,,,,
B.废弃污泥,WasteActivatedSludge(WAS),,,,,,,,,
,,,,,,,,,,
(a)进流之难分解固体物,,,,,,,,,
VSSA=进流水TSSx(1-RTSS)xVSS1xVSS2,,,,,,,,,
=,"1,367",lb/d=,621.3,Kg/d,,,,,
TSS=进流水TSSx(1-RTSS)x(1-VSS1/VSS3x(1-VSS2)),,,,,,,,,
=,"2,278",lb/d=,"1,036",Kg/d,,,,,
,,,,,,,,,,
(b)好氧槽之固体物,,,,,,,,,
活性TSS=进流水BOD5x(1-RBOD)-QinxBODeffx8.34)xYg,,,,,,,,,
/(MCRT+(1/MCRT+KdT),,,,,,,,,
=,,"1,849",lb/d=,840.4,Kg/d,,,,
非活性TSS=活性TSSxKdTxVSS5xMCRT=,,,,,,,,,
=,,823.5,lb/d=,374.3,Kg/d,,,,
,,,,,,,,,,
(c)硝化槽,,,,,,,,,
TSS=Ynx(1-N3VSSxVSS6)x(进流水TKNx(1-RTKN)-VSSAxN1VSS,,,,,,,,,
-好氧槽固体物xVSS4xN2VSS-QinxNH3effx8.34-TKNxTKN1)/,,,,,,,,,
(MCRTx(1/MCRT+KdnT)),,,,,,,,,
=,108.8,lb/d=,49.4,Kg/d,,,,,
总固体物,TotalTSS=,,,"5,059",lb/d=,"2,300",Kg/d,,,
净污泥产生率=TotalTSS/(进流BOD5x(1-RBOD)),,,,,,,,,
=,0.91,lbTSS/lbBOD5Applied,,,,,,,
总BOD5=总固体物/净污泥产生率,,,,,,,,,
=,"5,578",lb/d=,"2,535",Kg/d,,,,,
废弃污泥所含BOD5=,,,,,,,,,
=,总固体物x0.9x1.42x0.68+液体中所含BOD5,,,,,,,,
=,"1,999",Kg/d+,2.5,Kg/d,,,,,
=,"2,002",Kg/d,,,,,,,
挥发性固体物比率=,,,,,,,,,
=,(VSSA+好氧槽固体物xVSS4+硝化槽TSSxVSS6)/(TotalTSS),,,,,,,,
=,76.5,%,,,,,,,
,,,,,,,,,,
活性TSS比率=活性TSS/TotalTSS=,,,,,36.5,%,,,
硝化槽污泥比率=硝化槽TSS/TotalTSS=,,,,,,2.2,%,,
N-Content=(VSSAxN1VSS+好氧槽固体物xN2VSSxVSS4+硝化槽,,,,,,,,,
TSSxVSS6xN3VSS)/(硝化槽挥发性固体物比率xTotalTSS),,,,,,,,,
=,10.6,%,N/VSS,,,,,,,
P-Content=(进流水TPx(1-RTP)-Qinx出流水之TP)/,,,,,,,,,
(硝化槽挥发性固体物比率xTotalTSS),,,,,,,,,
=,8.6,%,P/VSS,,,,,,,
,,,,,,,,,,
(5)出流水水质预估,,,,,,,,,
,,,,,,,,,,
水质项目,,,,平均日流量,,尖峰时流量,,,
BOD5(mg/L),,,,,,,,,
难分解性,,,,6.7,,7.6,,,
溶解性,,,,1.8,,2.7,,,
,,,,,,,,,,
TSS(mg/L),假设值,,,,20.0,,20.0,,,
TKN-N(mg/L),,,,4.0,,13.1,,,
NH3-N(mg/L),,,,0.8,,9.9,,,
NOX-N(mg/L),,,,12.4,,7.9,,,
TN(mg/L),,,,16.4,,21.0,,,
Total-P(mg/L),,,,0.5,,0.5,,,
Alkalinity(mg/LasCaCO3),,,,82.6,,123.2,,,
Note:ResidualAlkalinityLessThan50mg/LasCaCO3IndicateNeed,,,,,,,,,
forSupplementalAlkalinity.,,,,,,,,,
附注:,,,,,,,,,
BODeff=出流水之溶解性BOD=Ksx(1/MCRT+KdT)/(μmaxT-1/MCRT-KdT)=,,,,,,,,,
=,1.8,mg/L,,,,,,,
NH3eff=出流水之NH3=Knx(1/MCRTAER+KdnT)/(μmaxT-1/MCRTAER-KdnT)=,,,,,,,,,
=,0.8,mg/L,,,,,,,
TKNeff=出流水之TKN=NH3eff+进流水TKNxTKN1/(Qinx8.34)+,,,,,,,,,
(硝化槽之挥发性固体物比率xN-Contentx出流水TSS)=,,,,,,,,,
=,4.0,mg/L,,,,,,,
,,,,,,,,,,
"1,930.87",-8.98,,,,,,,,
PeakNOXPossible=,,,23.36,,,,,,
MaxF/M=,,1.62,,,,,,,
SRDN=,,2.72,,,,,,,
NOXw/SimDenite=,,,12.1,,,,,,
NOXBasedonDenite=,,,7.9,,,,,,
NOXBasedonRecycle=,,,7.5,,,,,,
,,,,,,,,,,
4.空气需求量,,,,,,,,,
,,,,,,,,,,
理论需氧量为碳水化合物分解、硝化作用及硫化氢氧化各项需氧量,,,,,,,,,
之和,再扣除脱硝之释氧量,由下表计算:,,,,,,,,,
,,,,,,,,,,
,,OXYGENREQUIREMENTS(lb/day),,,,,,,
Item,,,,日平均值,,,每日尖峰值,,
,,,,(Average),,,(DiurnalPeak),,
Carbonaceous,,,,"5,817",,,"11,695",,
Nitrogeneous,,,,"5,004",,,"6,640",,
DenitrificationCredit,,,,"1,196",,,"1,701",,
H2S,,,,108,,,215,,
Net,,,,"9,733",,,"16,849",,
CarbonaceousOxygenDemand,,,,1.04,lbO2/lbBOD5Applied,,,,
TotalOxygenDemand,,,,1.74,lbO2/lbBOD5Applied,,,,
DiurnalPeakingFactor,,,,1.73,,,,,
,,,,,,,,,,
OUR(mg/L/hr),,,,,,,,,
,,Average,,34.24,,,,,
,,Peak,,59.27,,,,,
Aerationhp@2.2lbO2/hp-hr,,,,,,,,,
,,,,Average,,184.34,,,
,,,,Peak,,319.10,,,
Mixerhp@40hp/MG,,,,,,,,,
,,,,Anaerobic,,10.65,,,
,,,,Anoxic,,10.65,,,
,,,,Total,,21.30,,,
MLRhpRequirement@1hp/mgd,,,,,,,,,
,,,,ARCY,,6.46,,,
,,,,NRCY,,7.75,,,
,,,,Total,,14.22,,,
理论需氧量(取每日尖峰值),,,,,,,,,
TOR=,"16,849",lb/
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