Wastewater Flow Rate xam
Kev txiav txim siab tus nqi dej khib nyiab yog thawj kauj ruam hauv kev tsim kho dej khib nyiab. Ib qho qauv siv feem ntau yog:
Q=A × Qp × Qd
Qhov twg:
Q=Tus nqi dej khib nyiab (m³/d)
A=Cov neeg tsim qauv
Qp= Cov dej khib nyiab txhua hnub hauv ib tus neeg (L/d· neeg)
Qd= Cov dej khib nyiab txhua hnub
Cov dej khib nyiab pov tseg suav nrog
Pollutant load yog qhov tseem ceeb ntawm kev kho dej khib nyiab. Nws tuaj yeem xam raws li:
L=Q×C
Qhov twg:
L=Cov pa phem (kg/d)
Q=Tus nqi dej khib nyiab (m³/d)
C= Cov pa phem concentration (mg/L)
Qhov Chaw Kho Dej Pov Tseg Volume Calculation
Qhov ntim ntawm qhov chaw kho dej khib nyiab yog ib qho tseem ceeb tsim thiab kev ua haujlwm tsis zoo:
V=Q×t
Qhov twg:
V= Qhov ntim ntawm qhov chaw (m³)
Q=Tus nqi dej khib nyiab (m³/d)
t= Lub sijhawm nyob ntawm cov dej khib nyiab hauv qhov chaw (d)
Aeration Rate xam
Aeration yog txheej txheem tseem ceeb hauv kev kho dej khib nyiab lom neeg. Tus nqi aeration yog txiav txim siab siv:
A=Q × H × SAE
Qhov twg:
A=Aeration tus nqi (m³/min)
Q=Tus nqi dej khib nyiab (m³/d)
H= Dej qhov tob ntawm lub tank aeration (m)
SAE=Standard aeration efficiency
Sludge Production suav
Sludge tiam yog ib yam khoom los ntawm kev kho dej khib nyiab. Nws qhov ntau tuaj yeem kwv yees siv:
M=Q×Y
Qhov twg:
M= Sludge ntau lawm (kg/d)
Q=Tus nqi dej khib nyiab (m³/d)
Y= Sludge ntau lawm coefficient
Bar Screen Design xam xam
I. Cov Lus Qhia dav dav
1. Bar Gap
Qhov bar screen qhov sib txawv ntawm cov twj tso kua mis yuav tsum ua raws li cov kev xav tau ntawm cov twj tso kua mis.
Upstream ntawm kev kho mob, qhov sib txawv ntawm qhov screen yuav tsum tsis pub tshaj 40 mm:
25-40 mm rau kev ntxuav tes
16-25 mm rau kev tu txhua yam
Cov nroj tsuag loj tuaj yeem siv cov tshuaj ntxhib thiab zoo (50-100 mm rau ntxhib).
Cov nroj tsuag loj heev tuaj yeem nruab peb lub vijtsam: ntxhib, nruab nrab, thiab nplua.
Yog tias lub twj tso kua mis - qhov sib txawv ntawm qhov screen tsawg dua lossis sib npaug li 25 mm, tsis tas yuav muaj cov ntxaij vab tshaus ntxiv.
2. Kev tshuaj ntsuam
Kev tshuaj ntsuam ntim txawv raws li qhov chaw nyob. Yog tsis muaj cov ntaub ntawv hauv zos:
Bar npo qhov sib txawv 16-25 hli: 0.05-0.10 m³ / 1000 m³ dej khib nyiab
Screen nrug 30-50 hli: 0.01-0.03 m³ / 1000 m³ dej khib nyiab
Cov dej noo: ~ 80%
Qhov ceev: ~ 960 kg / m³
Large screens (>0.2 m³ / hnub) yuav tsum tau kho txhua yam.
3. Lwm Yam Kev Tsim Nyog
Kev khiav ceev los ntawm cov ntxaij vab tshaus: 0.6-1.0 m / s
Channel ceev tshaj tawm: 0.4-0.9 m / s
Lub kaum sab xis inclination: 45℃-75℃(lub kaum sab xis me me yuav tsum tau siv zog tsawg dua tab sis ntau qhov chaw)
Mechanical screen power units yuav tsum nyob hauv tsev lossis tiv thaiv
Cov qauv ntawm lub vijtsam yuav tsum muaj qhov cua txaus
Hoisting cov cuab yeej raug pom zoo rau kev saib xyuas thiab tshuaj xyuas tshem tawm
Carbon Source Calculation for Denitrification
1. Kev xaiv cov pa roj carbon
Denitrification yuav tsum muaj cov pa roj carbon monoxide sab nraud, uas tuaj yeem faib ua:
Fast carbon qhov chaw:Methanol, acetic acid, sodium acetate (kev ceev denitrification)
Slow carbon qhov chaw:Cov protein, qabzib, starch
Cellular cov ntaub ntawv
Cov pa roj carbon monoxide ceev feem ntau nyiam vim muaj cov denitrification ntau dua.
2. Carbon Source Dosage Calculation
a) Nitrogen tshuav nyiaj li cas
Lub zog tag nrho cov nitrogen muaj feem ntau ntawm ammonia thiab organic nitrogen, thaum effluent tag nrho nitrogen feem ntau suav nrog nitrate thiab organic nitrogen. Thaum kho, nitrogen yog ob qho tib si:
Tso tawm rau huab cua los ntawm denitrification
Assimilated rau hauv activated sludge
Tseem tshuav nyob rau hauv cov effluent kom ua tau raws li cov qauv tso tawm
Cov nitrogen assimilated rau hauv sludge yog:
Nsludge=0.05×(Si−Se)
Qhov twg Si thiab Se yog influent thiab effluent BOD₅ concentrations (mg/L).
Kev kho dej khib nyiab xam cov qauv & tsim cov ntaub ntawv
| Parameter | Cim | Chav tsev | Formula / Notes |
|---|---|---|---|
| Cov dej khib nyiab npaum li cas | Q | m³/d | Q=A × Qp × Qd |
| Tsim cov pej xeem | A | cov neeg | - |
| Txhua hnub per capita khib nyiab | Qp | L/d · neeg | - |
| Txhua hnub tso tawm coefficient | Qd | - | - |
| Parameter | Cim | Chav tsev | Formula |
|---|---|---|---|
| Pollutant load | L | kg/d | L = Q × C |
| Pollutant concentration | C | mg/L | - |
| Cov dej khib nyiab npaum li cas | Q | m³/d | - |
| Parameter | Cim | Chav tsev | Formula |
|---|---|---|---|
| Khoom ntim ntim | V | m³ | V = Q × t |
| Cov dej khib nyiab npaum li cas | Q | m³/d | - |
| Lub sij hawm nyob | t | d | - |
| Parameter | Cim | Chav tsev | Formula |
|---|---|---|---|
| Aeration tus nqi | A | m³/min | A=Q × H × SAE |
| Dej tob | H | m | - |
| Aeration efficiency | SAE | - | - |
| Parameter | Cim | Chav tsev | Formula |
|---|---|---|---|
| Sludge ntau lawm | M | kg/d | M = Q × Y |
| Sludge ntau lawm coefficient | Y | - | - |
| Cov dej khib nyiab npaum li cas | Q | m³/d | - |
| Parameter | Tus nqi / Ntau | Sau ntawv |
|---|---|---|
| Bar qhov sib txawv (manual) | 25-40 mm | Upstream ntawm qhov system |
| Bar qhov sib txawv (mechanical) | 16-25 mm | Upstream ntawm qhov system |
| Coarse screen qhov sib txawv | 50-100 hli | Yeem, cov nroj tsuag loj |
| Flow ceev los ntawm qhov screen | 0.6–1.0 m/s | - |
| Channel ceev ceev upstream | 0.4–0.9 m/s | - |
| Screen inclination | 45℃-75 degree | Lub kaum sab xis → tsawg zog, hneev taw loj dua |
| Kev ntsuas dej noo | 80% | - |
| Qhov ntom ntom | 960 kg/m² | - |
| Kev tu lub vijtsam | Phau ntawv / Mechanical |
Based on daily volume (>0.2 m³ → mechanical) |
| Parameter | Cim | Chav tsev | Formula / Notes |
|---|---|---|---|
| Nitrogen hauv sludge (assimilation) | N_sludge | mg/L | N_sludge=0.05 × (Si - Se) |
| Nitrate nitrogen tshem tawm los ntawm denitrification | NO3⁻-N | mg/L | NO3⁻-N=Kde × Si |
| Denitrification parameter | Kde | kg NO3⁻-N/kg BOD5 | 0.35 (txoj kev xav 1/2.86) |
| Sab nraud carbon nitrogen yuav tsum tau | N | mg/L | N=Ni - Kde × Si - 0.05 × (Si - Se) |
| Influent BOD5 | Si | mg/L | - |
| Effluent BOD5 | Se | mg/L | - |
| Nthuav tag nrho nitrogen | Ni | mg/L | - |
Cov ntsiab lus carbon Source:
Cov peev txheej ceev:Methanol, ethanol, acetic acid, sodium acetate (nyiam dua)
Cov peev txheej qeeb:Cov hmoov txhuv nplej siab, piam thaj, protein
Cellular cov ntaub ntawv:Yeem, qeeb denitrification
Daim ntawv siv
Tag nrho cov qauv yog ua raws li cov qauv tsim thiab kev xam cov theoretical.
Rau kev cog qoob loo tiag tiag, kev ntsuas hauv zos thiab kev soj ntsuam cov ntaub ntawv yuav tsum tau siv.
Bar screen thiab aeration tsim yuav tsum xav txog qhov chaw - tshwj xeeb hydraulic tej yam kev mob.