Pump and Aeration Tank Sizing

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Transcript of Pump and Aeration Tank Sizing

pompa transferCPompa TransferFungsi :Untuk memompakan air dari bak equalisasi ke reaction tankJenis Centrifugal pumpBahan konstruksi :Commercial SteelData :Kondisi penyimpanan80oCDensity minyak870.6kg/m354.3497828466lbm/ft3(Perry, 1997)Viskositas ()20cP0.0134393795lbm/ft.dtk(Kirk Othmer, 1967)Laju alir massa13307.099kg/jam8.1492008921lbm/detLaju alir volume0.150ft3/detDiameter optimum, De = 3,9 x Q0,45 x 0,13 ...... (Timmerhaus, 1980)2.7912778394inch70.89845712mmDigunakan pipa dengan spesifikasi :Ukuran pipa nominal2inSchedule80Diameter dalam (ID)1.939in0.1615833333ftDiameter luar (OD)2.375in0.1979166667ftLuas penampang (a1)0.0205ft2Bahan konstruksicomercial steelKecepatan linier, V =Q/a1 =7.3141413621ft/detBilangan Reynold, NRE =VD/4,779.5Instalasi pipa :Panjang pipa lurus L16.096m19.9999999999ft2buah gate valve fully open (L/D =13, Appendix C-2a, Foust, 1980)L2 =4.2016ft2buah standar elbow 90o (L/D =30, Appendix C-2a, Foust, 1980)L3 =9.696ft1buah inward protecting pipe intrance, (k =0.78, Appendix C-2c dan C-2d, Foust, 1980)L3 =8.5ft1buah protecting pipe exit0.78, Appendix C-2c dan C-2d, Foust, 1980)L3 =8.5ftPanjang pipa total (L)50.8975999999ftFaktor gesekan, f =0.0095Gaya gesek, Ffv2L/2gcD2.4857942483ft. Lbf/lbmTinggi pemompaan, z =4.572m14.9999999999ft4.572mStatic head, z.g/gc =14.9999999999ft. Lbf/lbmVelocity head, v2/2gc =0Pressure head, P/ =0Ws = z.g/gc + v2/2gc + P/ + F17.4857942482ft. Lbf/lbmTenaga pompa, P = Ws.Q./5500.2590822729HPEffisiensi, =80%Tenaga pompa,yang dibutuhkan = 0.3238528411HP0.2414970222kW

ASDKriteria DisainaHidraulic Retention Time pd20oCutk Primary + Activated Sludge Waste
user: 15 - 20 hari

haribSolid Loading
user: 1.6 - 4.8 kg volatile/m3.harikg volatile solid/m3.haricKebutuhan Oksigen utk :Cell Tissue
user: sekitar 2.3 kg O2/ solid destroyed

BOD5 pd primary sludge
user: 1.6 - 1.9 kg O2/kg solid destroyed

dEnergi utk mixingMechanical Aerator
user: 19.7 - 39.5 kW/1000 m3

Diffused Air Mixing
user: 0.02 - 0.04 m3/m3.min

eDO residu dalam liquid
user: 1 - 2 ppm

fReduksi pada VSS
user: 40 - 50%

PerencanaanJumlah ASD2buahUtk melayani2thickenerKarakteristik Lumpur dari Thickener (effluent thickener)Berat solid in6,436.56kg/hariBerat lumpur In128,731.20kg/hariKadar Solid In5%Kadar Air In95%BJ Lumpur In996.82kg/m30.99682gr/cm3Volume lumpur In129.14m3/hariData dari hasil percobaan lab. Utk Pengolahan pada ASDReduksi VSS30%VSS remain70%Suhu Air Limbah25oCKebutuhan O2 utk cell tissue2.3kg O2/ kg solidKedalaman tangki rencana3mDirencanakan Effluent ASDKadar Solid35%Kadar Air 65%MLVSS/MLSS0.8Perhitungan1Hidraulic Retention TimePada reduksi VSS30%dan pada suhu25oCmaka diperoleh, sludge area (d) =500maka,HRT20hari2Total solid sbg VSSMLVSS/MLSS0.8makaBerat solid (VSS)5,149.25kg/hari3VSS yg tereduksi dari total berat solid (VSS) :VSS reduksi1,544.77kg/hariLUMPUR KELUAR DARI AEROBICSLUDGE DIGESTER4VSS yang lolos dari digester (VSS effluent)3,604.47kg/hari5Fixed Suspended Solid (FSS)BilaVSS0.8SSFSS0.2SS1,287.31kg/hari6Berat solid yg lolos dari ASD (solid effluen)4,891.79kg/hari7Specific gravity lumpur yg keluar dari ASDaVSS keluar dari ASD (Pv)73.7%bFSS keluar dari ASD (Pf) :26.32%cSpecific gravity solid keluar dari ASDSv untuk VSS1Sf untuk FSS2.5MakaSg1.19gr/cm31,188kg/m38Karakteristik sludge keluar dari digester (sludge efluen)aBerat lumpur (W lumpur)Dengan kadar solid out digester35%makaW lumpur13,976.53kg/haribVolume Lumpur11.77m3/haricVolume Air7.65m3/hari9Kebutuhan Oksigenutkoksidasi bahan organikreduksi amoniakshgO2 diperlukan3,552.98kg O2/hari10Volume udara yang dibutuhkan (vol. udara)Direncanakan :Udara mengandung20.20%berat O2Berat Jenis spesifik () udara pd leveldan tekanan di plant1.201kg/m3Efisiensi O2 transfer dari alat (mixer)10%MakaaKebutuhan udara teoritis (vol. theo) :Vol. theo14,645.31m3/haribKebutuhan udara aktual (vol. act) :146,453.08m3/hari101.70m3/min11Volume Tangki DigesterVol = (Vf - 2/3(Vf-Vd)) x tVf = volume lumpur yg ditambahkan tiap hari129.14m3/hariVd = volume digested sludge yg diremoval tiap hari11.77m3/harit20hariShgVol = (Vf - 2/3(Vf-Vd)) x t1,017.86m312Dimensi DigesterDirencanakan h3maLuas Permukaan (As)339.29m2As tiap bak169.64m2bDiameter (d)14.70m13Check Solid Loading=Berat solid influen/vol
user: 1.6 - 4.8 kg/m3.hari6.32kg/m3.harikrnlebih besarAsumsid17mSolid Loading Rate4.73kg/m3.hari14Kebutuhan Udara utk tiap m3 volume digester=keb. Udara aktual/vol. ASD0.0999187035m3/m3.minKeb. Udara/m3 volume digester dipakai utkmenentukan jenis mixer/pengadukmakaFreeboard (Fb)1mDiameter14.70mKedalaman (H) = h + Fb4m

Sheet11INFLUENT TO AERATION TANKQ2400m3/day24100m3/jamQAd0.63MGD634,012.93Gallon/hariBOD5into primary settling tank200mg/LSSinto primary settling tank200mg/LBOD5 removedin primary settling tank30%SS removedin primary settling tank55%BOD5 in Aeration Tank140mg/LSS inAeration Tank90mg/L2EFFLUENT OUT OF SETTLING TANK (ACCORDING TO SECONDARY TREATMENT EFF.CRITERIASesuai standar EPA kriteria effluent adalahBOD5effluentkurang dari30mg/Ldenganremoval efficiency>85%SS effluentkurang dari30mg/Ldenganremoval efficiency>85%

Dipilih BOD5effluent25mg/LSehinggaMLVSS/MLSS=0.8SS effluent25mg/LSoluble BOD5effluent6mg/L3REMOVAL EFFICIENCY, EsEs96%4OVERALL EFFICIENCY88%5Pilih qc dan kinetic coeficient dan kontrol MLSS dalam tangki aerasiqc=c5hariHanya untuk carboneous BOD5 removalqc3/4activated sludge retention time in systemY0.6mg VSS/mg BOD5Kd0.061/hariKd3/4decay coeficient of organisms (1/hari) based on order reaction1.15sustained factorMLSS2,500mg/L6Dimensi QAd3/4average daily flowrate dlmgallon/hariy3/4mass loading coeficient>1So 140mg/LS6mg/LMakaVolume Tangki Aerasi dibutuhkan112,995gallon15,107ft3DirencanakanJumlah Tangki Aerasi1buahmakaVolume masing-masing Tangki15,107ft3Depth of Water15.5ft4.72mUntuk Complete MixPerbandingan L : W2:1diperolehL45ft14m W22.5ft6.858mSehinggaVActual =15,694ft37Check Hydraulic Detention Time Rata-RataOperation Time24jam/haric=4.4jam8Check U & FMU0.421/hariF/M0.43lb BOD5/lb VSS.hariCheckOKE9Wastage of SludgePx377lb/hariQw339lb/hari10Return Sludge RatePilihThickened sludge concentration pada dasar clarifierantaraXw7,000sampai11,000mg/LShgXr5,600-8,800mg/LR0.530.28Qr0.34MGD0.18MGD11STRUKTUR INLET DAN OUTLETa)Pengaturan distribusi influentInlet channel berukuran2.5ftx2.5ft

b)Pengaturan struktur outlet

Width16ft4effluent trough2.5ftx2.5ft4effluent boxes with2.5ftx2.5ftx3memakaiflat weir

c)Headloss dari inlet ke outlet12Oksigen yang diperlukanaOksigen yg diperlukan secara teoritisDirencanakan(So - S)/BODu0.68O2/MLVSSmg/mg1.42O2T667lb O2/haribStandard Oxygen requirement (SOR) under Field ConditionsC3/4 minimum dissolved oxygen (DO) concentration yg diperlukan di tangki aerasia ()3/4 coeficient to account for effect of mixing intensity and tank geometrib ()3/4 coeficient of effect of salinity and solid in waste water on DO concentrationCs,203/4 saturation of oxygen in tape waterDirencanakanC3mg/La ()0.9b ()0.85Cs,209.1mg/LPb, Pressure at depth of disc diffuser15ftPada umumnya, efisiensi transfer oksigen dg memakai diffuser adalah sekitar10%Yang mana dapat digunakan sebagai pendekatan tekanan atmosfir sampai0.9atmPb1.44atmDirencanakanCsT, Oxygen Solubility pd suhu25oC=8.34mg/LmakaCsA9.77mg/LNormalnya suhu rata-rata di tangki aerasi adalah25oCSOR1,035lb O2/hari

Table: Standard Oxygen Transfer Efficiency (SOTE) for Air Areation Systems in Clean Water at 15' SubmergenceFine bubble diffusers, total floor coverage20 ~ 32Fine bubble diffusers, side-wall installation11 ~ 15Jet aerators (fine bubble)22 ~ 27Static aerators (medium-size bubble)12 ~ 14Coarse bubble diffusers, wide band pattern6 ~ 8Coarse bubble diffusers, narrow band pattern4 ~ 6

DirencanakanSOTE (Standad Oxygen Transfer Efficiency)10%SOTR10,351lb O2/hari

Sheet2

ParametersValueUnitFlowrate2400m3/hari100m3/jam24jam/hariBOD1500mg/L1666.6666666667LPMCOD2500mg/LTSS1916mg/L

Sizing Primary Settler dg tube dek mediaFlowrate rata per jam100m3/jamDesign Flowrate surface3.5m3/m2/jamSurface Area Primary Settler diperlukan28.5714285714m2Surface Area Actual provided30m2312.0003120003(dibagi sekitar 10%nya)

Sizing Bioreactor 1 & 2 Total BOD load per hari3600kg/hariBOD yg terbuang oleh primary settler25%900.00kg/hariBOD yg tersisa utk diolah scr biological2700.00kg/haridibulatkan3000.00Kapasitas pembuangan organik rata2 dr Biomedia14kg/m3Total Assisted Media Biofilm Biomedia Media Surface Area = 950 m2/m3, yg aktive diperkirakan 500 - 550 m2/m3.Biomedia diperlukan192.8571428571m3Biomedia yg diberikan/dipilih200m3O2 diperlukan per hari utk mengoksidasi BOD3600kgOksigen yg diperlukan secara Aktual6171.43kgLiquid Depth dlm tangki Aerasi2m Range det time Aeration Tank 2 - 6 jamTangki AerasiWaktu Tinggal6jamVolume Tangki600m3DO diperlukan 3mg/LUdara diperlukan per hari408163.265306122m3/hariUdara diperlukan per jam17006.8027210884m3/jamDipilih Udara diberikan300m3/jamHead Blower2700mm

Sizing Secondary Settler dg tube dek mediaFlowrate rate rata2 per jam100m3/jamFlowrate Surface disain3m3/m2/jamSurface Area Primary Settler diperlukan33.3333333333m2364.0003640004S.f20%Actual Surfasce Area yg diberikan/dipilih 40m20.091575