Description
Technical Parameters
Sewage Treatment Aerobic Tank Oxygen Demand Calculator
The following is AquaSust for you to sort out the correct way to calculate the amount of aeration：
- Blue block is the design datameter : be filled in
- Brown: calculate process data
- Greener : last result for your proces
| 1.Sewage Treatment Aerobic Tank--Basic data: | ||||
| 1,Design water quantity Q | m³/day | m³ / h | m³/s | |
| 10000 | 416.67 | 0.12 | ||
| 2,inlet/outlet BOD(mg/L) | 142 | 13 | ||
| 3,a＇/b＇/α/β | 0.32 | 0.1 | 0.55 | 0.80 |
| kgO2/kgBOD | kgO2/kgMLSS·d | Aeration equipment in sewage and clear water Ratio of total oxygen transfer coefficient |
The ratio of saturated DO concentration ratio |
|
| Domestic Sewage | 0.42～0.53 | 0.188～0.11 | 0.8～0.9 | 0.9～0.95 |
| Bleaching and dyeing wastewater | 0.5～0.6 | 0.07 | ||
| Printing and dyeing wastewater | 0.32 | 0.10 | 0.45～0.55 | 0.7～0.8 |
| Pulp and Paper | 0.38 | 0.09 | ||
| Petrochemical | 0.75 | 0.16 | ||
| 4, aerator air release point from the water surface height H (m) |
4.7 | |||
| 5,Water temperature in the aeration pool T | 35 | |||
| 2.Sewage Treatment Aerobic Tank--Oxygen Demand Calculation | ||||
| 1,V(m3) | V＝Q*ΔBOD/(1000*Fw*Nw) | 6450.00 | ||
| 2,Fw Sludge loading(kgBOD/kgMLVSS d) | 0.1 | 0.1～0.3 | ||
| 3,Nw sludge concentration(g/L) | 2 | 1.5～3 | ||
| 4,Residence time T(h) | 15.48 | |||
| 5,Oxygen demand O2 (kgO2/d) | O2＝Q*ΔBOD*a＇/1000＋V*Nw*b＇ | 1702.8 | ||
| 6,Pressure correction factor | P=Pb/0.206＋Qt/42 | 1.15 | ||
| 7,Air release point at the absolute pressure (MPa) | Pb＝Pa＋H/100 | 0.148 | Pa＝0.101 | |
| 8,Air escapes the surface of the pool when the percentage of oxygen in the gas | Ot＝21*(1-ε)*100/[79+21*(1-ε)] | 18.08 | ||
| 9,Oxygen utilization rate of ε aerator | 0.17 | |||
| 10, T ℃ in distilled water saturated DO value (mg / L) Cs (T) | 7 | 20℃/25℃/30℃ | ||
| 9.17/8.4/7.6 | ||||
| 11,DO value to be maintained for normal operation of aeration tank (mg/L) Ct |
2.5 | |||
| 12,Calculation of oxygen demand in the standard state | Oc＝O2*Cs20/(α*1.024^(T-20)*(β*ρ*P*Cs(T)-Ct)) | 5228.22 | ||
| 13,Total air supply of fan (m3/d) | Q＝Oc/(0.28*ε) | 109836.50 | ||
| 14,Gas-Water ratio | 10.98 | |||
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