mass balance for waste water, and aeration in waste water
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Mass and Balance QB
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This pdf condenses in two pages the entire knowledge necessary to pass the JAR ATPL exams on Mass and Balance. Find more information and other subjects on www.ATPLessentials.com. Feedb…Descrição completa
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This pdf condenses in two pages the entire knowledge necessary to pass the JAR ATPL exams on Mass and Balance. Find more information and other subjects on www.ATPLessentials.com. Feedback is ...
Heat And Mass Balance And Transfer
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This is one sheet in my Rotary Dryer Spreadsheet to calculate mass balance of Rotary Dryer. Anyone interested to get the original version (xls format), please don't be hesitate to contact me…Full description
1 INFLUENT TO AERATION TANK Q
2400 24 100 0.63 634,012.93 200 200 30%
QAd BOD5
into primary settling tank SS into primary settling tank BOD5 removedin primary settling tank
m3/day m3/jam MGD Gallon/hari mg/L mg/L
SS removed
in primary settling tank
55%
BOD5 in
Aeration Tank
140 mg/L
SS in
Aeration Tank 90 mg/L 2 EFFLUENT OUT OF SETTLING TANK (ACCORDING TO SECONDARY TREATMENT EFF.CRITERIA Sesuai standar EPA kriteria effluent adalah BOD5effluent kurang dari 30 mg/L dengan removal efficiency > 85% SS effluent kurang dari 30 mg/L dengan removal efficiency > 85% Dipilih Sehingga
BOD5effluent MLVSS/MLSS SS effluent
25 mg/L =
0.8 25 mg/L
Soluble BOD5effluent
6 mg/L
3 REMOVAL EFFICIENCY, Es Es 4 OVERALL EFFICIENCY 5 Pilih qc dan kinetic coeficient dan kontrol MLSS dalam tangki aerasi qc = θc Hanya untuk carboneous BOD5 removal qc Y Kd Kd Ψ sustained factor MLSS 6 Dimensi QAd
96 % 88 % 5 hari
3/4 activated sludge retention time in system 0.6 mg VSS/mg BOD5 0.06 1/hari 3/4 decay coeficient of organisms (1/hari) based on order reaction 1.15 2,500 mg/L 3/4 average daily flowrate dlm 3/4 mass loading coeficient
y So S Maka Volume Tangki Aerasi dibutuhkan
gallon/hari >
1 140 mg/L 6 mg/L 112,995 gallon
15,107 ft Direncanakan Jumlah Tangki Aerasi
3
1 buah 3 15,107 ft 15.5 ft
maka Volume masing-masing Tangki Depth of Water Untuk Complete Mix Perbandingan L : W diperoleh L W Sehingga VActual =
2:
7 Check Hydraulic Detention Time Rata-Rata Operation Time θc = 8 Check U & FM U F/M Check 9 Wastage of Sludge Px Qw 10 Return Sludge Rate Pilih Thickened sludge concentration pada dasar clarifier Xw 7,000 Shg Xr 5,600 R Qr 11 STRUKTUR INLET DAN OUTLET a) Pengaturan distribusi influent Inlet channel berukuran
b) Pengaturan struktur outlet Width 4 effluent trough 4 effluent boxes with memakai flat weir c) Headloss dari inlet ke outlet 12 Oksigen yang diperlukan a Oksigen yg diperlukan secara teoritis Direncanakan
(So - S)/BODu O2/MLVSS
» mg/mg
0.68 1.42 667 lb O2/hari
O 2T
b Standard Oxygen requirement (SOR) under Field Conditions C 3/4 minimum dissolved oxygen (DO) concentration yg diperlukan di tangki aerasi a (α) 3/4 coeficient to account for effect of mixing intensity and tank geometri b (β) 3/4 coeficient of effect of salinity and solid in waste water on DO concentration Cs,20 3/4 saturation of oxygen in tape water Direncanakan C 3 mg/L a (α) 0.9 b (β) 0.85 Cs,20 9.1 mg/L Pb, Pressure at depth of disc diffuser 15 ft Pada umumnya, efisiensi transfer oksigen dg memakai diffuser adalah sekitar 10% Yang mana dapat digunakan sebagai pendekatan tekanan atmosfir sampai 0.9 atm Pb Direncanakan T Cs , Oxygen Solubility pd suhu maka
Cs
1.44 atm o 25 C
A
Normalnya suhu rata-rata di tangki aerasi adalah SOR
=
8.34 mg/L 9.77 mg/L o 25 C 1,035 lb O2/hari
Table: Standard Oxygen Transfer Efficiency (SOTE) for Air Areation Systems in Clean Water at 15' Submerge Fine bubble diffusers, total floor coverage 20 ~ 32 Fine bubble diffusers, side-wall installation 11 ~ 15 Jet aerators (fine bubble) 22 ~ 27 Static aerators (medium-size bubble) 12 ~ 14 Coarse bubble diffusers, wide band pattern 6~8 4~6 Coarse bubble diffusers, narrow band pattern Direncanakan SOTE (Standad Oxygen Transfer Efficiency) SOTR
10 % 10,351 lb O2/hari
Gallon/hari
mg VSS/mg BOD5
4.72 m
14 m 6.858 m
lb BOD5/lb VSS.hari
mg/L mg/L
MGD
x
3
n Water at 15' Submergence
Perhitungan Peripheral velocity of an impeller N D V
Rational Speed Diameter Velocity
RPM m m/s
V=(NxD)/229
Ts HP N Ds
Shear Stress Horse Power Rational Speed Diameter shaft
T HP N
Torque Horse Power Rational Speed
T=(5250xHP)/N
H P Sg
Head Pressure Spesific Gravity
H=P*2.3/Sg
V D Q
Velocity Diameter Flow
Q=VxD^2x2.445
V Hv
Velocity Vertcal Head
Ts=HPx321000/(NxDs^3)
Hv=V^2/64.4
000/(NxDs^3)
Kuantitas Influen Air Limbah Q.ave
0.4709 l/det
3 40.68576 m /hari
Q.min
0.2355 l/det
3 20.3472 m /hari
Q.max
0.4709 l/det
3 40.68576 m /hari
Qp
0.7064 l/det
61.03296 m /hari
Kualitas Influen Air Limbah BOD5 COD TSS NH3 bebas Detergen Phenol Sisa Klor (Cl2) Phosphat (ortho)
3
71 147 116 0.184 0.2566 0 0 0.4121
mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l
Baku Mutu Limbah Cair Untuk Kegiatan Rumah Sakit BOD5 30 mg/l COD TSS NH3 bebas Detergen Phenol Sisa Klor (Cl2)
80 30 0.1 0.5 0.01 0.5 2
Phosphat (ortho) GRIT CHAMBER Neraca Massa Sebelum Grit Chamber M.BOD Q.ave = Q.min = Q.max = Qp =