污水處理廠計(jì)算書(計(jì)算式)

四、曝氣池,,,,,,,,,

,,,,,,,,,,

1.設(shè)計(jì)條件,,,,,,,,,

,,,,,,,,,,

曝氣池采用平均日流量作為設(shè)計(jì)基準(zhǔn)，并配合檢驗(yàn)尖峰小時(shí)流量時(shí)情形。,,,,,,,,,

依平均日質(zhì)量平衡計(jì)算結(jié)果，初沉池出流水性質(zhì)：,,,,,,,,,

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,,,,,

依尖峰小時(shí)質(zhì)量平衡計(jì)算結(jié)果，初沉池出流水性質(zhì)：,,,,,,,,,

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,,,,,

二沉池設(shè)計(jì)面積：,,,,,,,,,

二沉池面積＝,,"1,257",m2=,"13,526",ft2,,,,

,,,,,,,,,,

2.計(jì)算結(jié)果摘要,,,,,,,,,

,,,,,,,,,,

回流污泥(RAS),,,,,,,,,

Q=,3.95,MGD=,"14,962",CMD,,,,,

廢棄污泥(WAS),,,,,,,,,

Q=,287.5,CMD=,0.076,MGD,,,,,

TSS=,"2,300",Kg/d,,,,,,,

BOD5=,"2,002",Kg/d,,,,,,,

反應(yīng)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,,,,,,,

總非溶解性BOD5＝,,,6.7,mg/L,,,,,

溶解性BOD5＝,,,1.8,mg/L,,,,,

總磷＝,,,0.5,mg/L,,,,,

,,,,,,,,,,

3.設(shè)計(jì)生物反應(yīng)槽,,,,,,,,,

,,,,,,,,,,

(1)原進(jìn)流水水質(zhì)特性基本假設(shè),,,,,,,,,

"(參考""Theory,DesignandOperationofNutrientRemoval-ActivatedSludge",,,,,,,,,

"Process""一書)",,,,,,,,,

,,,,,,,,,,

A.污染負(fù)荷,,,,,,,,,

平均日流量時(shí)：,,,,,,,,,

流量，Qin，MGD,,,,6.46,＝,"24,459",CMD,,

BOD5，lb/d,,,,"7,777",＝,144.3,mg/L,,

總懸浮固體物，TSS，lb/d,,,,"4,558",＝,84.6,mg/L,,

總凱氏氮，TKN，lb/d,,,,"2,156",＝,40.0,mg/L,,

總磷，TP，lb/d,,,,404.9,＝,7.5,mg/L,,

堿度，lb/dasCaCO3,,,,"10,779",＝,200.0,mg/L,,

硫化氫，lb/d,,,,53.9,＝,1.0,mg/L,,

尖峰小時(shí)流量時(shí)：,,,,,,,,,

流量，Qin，MGD,,,,12.88,＝,"48,763",CMD,,

BOD5，lb/day,,,,"15,560",＝,144.8,mg/L,,

總懸浮固體物，TSS，lb/d,,,,"9,117",＝,84.9,mg/L,,

總凱氏氮，TKN，lb/d,,,,"4,298",＝,40.0,mg/L,,

總磷，TP，lb/d,,,,810.1,＝,7.5,mg/L,,

堿度，lb/dasCaCO3,,,,"21,489",＝,200.0,mg/L,,

硫化氫，lb/d,,,,107.4,＝,1.0,mg/L,,

B.進(jìn)流水質(zhì)特性,,,,,,,,,

"總BOD/BOD5,R1=",,,,1.47,,,,,

"難分解性總凱氏氮(%),TKN1=",,,,4.0,,,,,

"難分解溶解性COD(%),COD1=",,,,12.50,,,,,

總懸浮固體物(TSS),,,,,,,,,

,"揮發(fā)性固體物(VSS)(%),VSS1",,,,,,75.0,,

,"難分解之揮發(fā)性固體物(%),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之估計(jì)值,R3",,,,,,,2.21,,

"溶解性BOD5/總BOD5之估計(jì)值(%),R4",,,,,,,75,,

初沉池中各污染物去除率：,,,,,,,,,

"TSS去除率(%),RTSS",,,,,,,60,,

"BOD5,RBOD=RTSSx進(jìn)流水TSS/進(jìn)流水BOD5xVSS1x(1-VSS2)xR2/R1=",,,,,,,,28.3,

"總凱氏氮,RTKN=RTSSx進(jìn)流水TSS/進(jìn)流水TKNxVSS1xN1VSS=",,,,,,,,19.0,

"總磷,RTP=RTSSx進(jìn)流水TSS/進(jìn)流水TPxVSS1xP1VSS=",,,,,,,,11.3,

(2)曝氣池中之生化反應(yīng)機(jī)制常數(shù)及水質(zhì)特性,,,,,,,,,

,,,,,,,,,,

A.喜氣槽,,,,,,,,,

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,,,,,,

"揮發(fā)性TSS(%),VSS4=",,,,,,90.0,,,

"難分解性VSS(%),VSS5=",,,,,,23.0,,,

"VSS之氧當(dāng)量數(shù)(mgCOD/mgVSS),CODVSS=",,,,,,1.42,,,

"VSS中之氮含量(%,N/VSS)N2VSS=",,,,,,12.0,,,

"BOD5/總磷(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,,,,,,

"揮發(fā)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,,,,,,,,,

單位需氧量(mgO2/mgNO3generated)=,,,,,4.60,,,,

堿度消耗量(mgasCaCO3/mgNO3)=,,,,,7.20,,,,

,,,,,,,,,,

D.脫硝作用,,,,,,,,,

單位需氧量(mgO2/mgNO3denitrified)=,,,,,2.86,,,,

堿度產(chǎn)生量(mgasCaCO3/mgNO3)=,,,,,3.60,,,,

,,,,,,,,,,

E.硫化氫氧化作用,,,,,,,,,

單位需氧量(lbO2/lbH2S)=,,,,,2.00,,,,

(3)操作參數(shù),,,,,,,,,

由于設(shè)計(jì)一VIP生物處理法所須考慮之設(shè)計(jì)參數(shù)相當(dāng)多，除一般活性,,,,,,,,,

污泥法所常采用之MLSS、F/M及HRT外，尚考慮硝化液回流率(NRCY)，,,,,,,,,,

厭氣池回流率(ARCY)，回流污泥(RAS)等，西圖公司以多年發(fā)展VIP系統(tǒng),,,,,,,,,

之經(jīng)驗(yàn)，建議各參數(shù)之設(shè)計(jì)準(zhǔn)則如下：,,,,,,,,,

,,,,,,,,,,

F/M(kgTBOD/kgMLVSS-day),,,,0.1~0.2,,,,,

SRT(days),,,,5~15,,,,,

MLSS(mg/L),,,,2000~3500,,,,,

HRT(hours),,,,,,,,,

,,厭氧槽,,1.00,,,,,

,,缺氧槽,,1.00,,,,,

,,好氧槽,,4.0~10.0,,,,,

,,合計(jì),,6.0~12.0,,,,,

RAS(%),,,,40~80,,,,,

NRCY(%),,,,100,,,,,

ARCY(%),,,,50~100,,,,,

,,,,,,,,,,

A.基本設(shè)計(jì)條件假設(shè),,,,,,,,,

依據(jù)民治污水處理廠的背景條件，假設(shè)各項(xiàng)操作參數(shù)如下。,,,,,,,,,

水中溶氧=,,2.0,mg/L,細(xì)胞停留時(shí)間(MCRT)=,,,10,天,

pH=,,7.20,units,水溫=,,,15,℃,

MLSS=,,"3,000",mg/L,好氧槽脫硝率ANR=,,,10,%,

廢棄污泥濃度,,"8,000",mg/L,NRCY=,,,120,%,

,,,,,,,,,,

B.反應(yīng)槽體積計(jì)算,,,,,,,,,

依前述設(shè)計(jì)準(zhǔn)則，假設(shè),,,,,,,,,

好氧槽之HRT=,,6.0,hours,,,,,,

缺氧槽之HRT=,,1.0,hours,,,,,,

厭氧槽之HRT=,,1.0,hours,,,,,,

則可得,,,,,,,,,

好氧槽總體積(AERVol),,,,,,,,,

＝,QinxTAER,,,,,,,,

＝,6.46,MGDx,6.0,hours,,,,,

＝,1.62,MG,,,,,,,

缺氧槽總體積(ANXVol),,,,,,,,,

＝,QinxTANX,,,,,,,,

＝,6.46,MGDx,1.0,hours,,,,,

＝,0.27,MG,,,,,,,

厭氧槽總體積(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,,,,,

總進(jìn)流量＝,,"24,459",CMD+,"14,122",CMD,,,,

＝,,"38,581",CMD=,10.19,MGD,,,,

選擇反應(yīng)槽池?cái)?shù)=,,4,池,,,,,,

選擇反應(yīng)槽水深=,,6.0,m,,,,,,

,,,,,,,,,,

已知各槽體之體積如下:,,,,,,,,,

總體積(TOTVol)＝,,,,2.15,MG=,"8,153",m3,,

好氧槽總體積(AERVol)＝,,,,1.62,MG=,"6,115",m3,,

厭氧槽總體積(ANAVol)＝,,,,0.27,MG=,"1,019",m3,,

缺氧槽總體積(ANXVol)＝,,,,0.27,MG=,"1,019",m3,,

選擇四個(gè)反應(yīng)槽總寬度＝,,,,32.0,m,,,,

每一反應(yīng)槽寬度=,,,32.0,m/,4,=,8.0,,

選擇反應(yīng)槽的渠道數(shù)=,,,1,,,,,,

每一渠道寬度=,,,8.0,m/,1,=,8.0,m,

每一反應(yīng)槽之好氧槽長度=,,,,,,,,,

＝,"6,115",m3/,6.0,m/,8.0,m/,4,,

＝,31.8,m,,,,,,,

選擇好氧槽之長度＝,,,28.0,m,,,,,

好氧槽每一分區(qū)長度＝,,,28.0,/,4,=,7.0,m,

缺氧槽及厭氧槽長度,,,,,,,,,

＝,"1,019.1",m3/,6.0,m/,4.0,m/,12,,

＝,3.5,m,,,,,,,

選擇厭氧槽或缺氧槽之長度為,,,,3.5,m,,,,

每一反應(yīng)槽總長度=,,,,,,,,,

＝,28.0,m+,3.5,m+,3.5,m+,3.5,m,

＝,38.5,m,,,,,,,

每一渠道長度=,,38.5,m/,1,=,38.5,m,,

,,,,,,,,,,

厭氧槽總體積(ANAVol),,,,,,,,,

＝,3.50,mx,4.00,mx,6.00,mx,12,,

＝,"1,008",m3=,0.27,MG,,,,,

缺氧槽總體積(ANXVol),,,,,,,,,

＝,3.50,mx,4.00,mx,6.00,mx,12,,

＝,"1,008",m3=,0.27,MG,,,,,

好氧槽總體積(AERVol),,,,,,,,,

＝,7.00,mx,8.00,mx,6.00,mx,16,,

＝,"5,376",m3=,1.42,MG,,,,,

反應(yīng)槽總體積(TOTVol),,,,,,,,,

＝,"7,392",m3=,1.95,MG,,,,,

,,,,,,,,,,

Check:,,,,,,,,,

厭氧槽之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!,

反應(yīng)槽之總HRT=,,,,,7.25,hours,,OK!,

MLSS=(TotalTSSxMCRT)/(8.34xTotalVol),,,,,,,,,

=,"3,107",mg/L,,,,,,,

(其中TotalTSS系指廢棄污泥中之TSS量，請見4.固體物產(chǎn)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.脫氮計(jì)算,,,,,,,,,

"脫氮速率常數(shù)(SpecificDenitrificationRate,SDRN)系指單位時(shí)間之單",,,,,,,,,

位MLSS所能去除之氮量，其計(jì)算式為：,,,,,,,,,

SDNR20=0.03xF/M+0.029(在20oC下),,,,,,,,,

SDNRT=SDNR20x1.06(T-20),,,,,,,,,

因此本反應(yīng)槽之SDNR15=,,,,1.87,mg/g/hr,,,,

,,,,,,,,,,

NOX-N(mg/L)濃度計(jì)算:,,,,,,,,,

無脫硝反應(yīng)時(shí)DNo,,,,,,,,,

＝,(1+MCRTxKdnT)xnitrifierTSS/(Qinx8.34xYn)=,,,,,,20.2,,

"(其中NitrifierTSS系指廢棄污泥中由硝化反應(yīng)產(chǎn)生之TSS量,請見(4)固體",,,,,,,,,

物產(chǎn)量),,,,,,,,,

考慮好氧槽脫硝反應(yīng)時(shí)DN1,,,,,,,,,

＝,(1-ANR)xDNo=,,,18.2,,,,,

考慮缺氧槽脫硝反應(yīng)時(shí),,,,,,,,,

＝,DN1-SDNRxANXHRTxMLSS/1000=,,,,,12.4,,,

考慮回流NRCY時(shí),,,,,,,,,

＝,DN1/(1+RAS/Qin+NRCY/100)=,,,,8.3,,,,

,,,,,,,,,,

D.回流污泥量計(jì)算,,,,,,,,,

已知假設(shè)回流污泥濃度=,,,,"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)固體物產(chǎn)量，SOLIDSPRODUCTION(lb/d),,,,,,,,,

,,,,,,,,,,

A.初沉污泥，PrimarySludge,,,,,,,,,

TSS=進(jìn)流水TSSxRTSS,,,,,,,,,

=,"6,834",lb/d=,"3,107",Kg/d,,,,,

VSS=進(jìn)流水TSSxRTSSxVSS1,,,,,,,,,

=,"5,126",lb/d=,"2,330",Kg/d,,,,,

生物可分解性VSS=進(jìn)流水TSSxRTSSxVSS1x(1-VSS2),,,,,,,,,

=,"3,075",lb/d=,"1,398",Kg/d,,,,,

,,,,,,,,,,

B.廢棄污泥，WasteActivatedSludge(WAS),,,,,,,,,

,,,,,,,,,,

(a)進(jìn)流之難分解固體物,,,,,,,,,

VSSA=進(jìn)流水TSSx(1-RTSS)xVSS1xVSS2,,,,,,,,,

=,"1,367",lb/d=,621.3,Kg/d,,,,,

TSS=進(jìn)流水TSSx(1-RTSS)x(1-VSS1/VSS3x(1-VSS2)),,,,,,,,,

=,"2,278",lb/d=,"1,036",Kg/d,,,,,

,,,,,,,,,,

(b)好氧槽之固體物,,,,,,,,,

活性TSS=進(jìn)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(進(jìn)流水TKNx(1-RTKN)-VSSAxN1VSS,,,,,,,,,

-好氧槽固體物xVSS4xN2VSS-QinxNH3effx8.34-TKNxTKN1)/,,,,,,,,,

(MCRTx(1/MCRT+KdnT)),,,,,,,,,

=,108.8,lb/d=,49.4,Kg/d,,,,,

總固體物，TotalTSS=,,,"5,059",lb/d=,"2,300",Kg/d,,,

凈污泥產(chǎn)生率=TotalTSS/(進(jìn)流BOD5x(1-RBOD)),,,,,,,,,

＝,0.91,lbTSS/lbBOD5Applied,,,,,,,

總BOD5=總固體物/凈污泥產(chǎn)生率,,,,,,,,,

＝,"5,578",lb/d=,"2,535",Kg/d,,,,,

廢棄污泥所含BOD5=,,,,,,,,,

＝,總固體物x0.9x1.42x0.68+液體中所含BOD5,,,,,,,,

＝,"1,999",Kg/d+,2.5,Kg/d,,,,,

＝,"2,002",Kg/d,,,,,,,

揮發(fā)性固體物比率=,,,,,,,,,

＝,(VSSA+好氧槽固體物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+好氧槽固體物xN2VSSxVSS4+硝化槽,,,,,,,,,

TSSxVSS6xN3VSS)/(硝化槽揮發(fā)性固體物比率xTotalTSS),,,,,,,,,

＝,10.6,%，N/VSS,,,,,,,

P-Content=(進(jìn)流水TPx(1-RTP)-Qinx出流水之TP)/,,,,,,,,,

(硝化槽揮發(fā)性固體物比率xTotalTSS),,,,,,,,,

＝,8.6,%，P/VSS,,,,,,,

,,,,,,,,,,

(5)出流水水質(zhì)預(yù)估,,,,,,,,,

,,,,,,,,,,

水質(zhì)項(xiàng)目,,,,平均日流量,,尖峰時(shí)流量,,,

BOD5(mg/L),,,,,,,,,

難分解性,,,,6.7,,7.6,,,

溶解性,,,,1.8,,2.7,,,

,,,,,,,,,,

TSS(mg/L)，假設(shè)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+進(jìn)流水TKNxTKN1/(Qinx8.34)+,,,,,,,,,

(硝化槽之揮發(fā)性固體物比率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.空氣需求量,,,,,,,,,

,,,,,,,,,,

理論需氧量為碳水化合物分解、硝化作用及硫化氫氧化各項(xiàng)需氧量,,,,,,,,,

之和，再扣除脫硝之釋氧量，由下表計(jì)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,,,

理論需氧量(取每日尖峰值),,,,,,,,,

TOR=,"16,849",lb/