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| Hangzhou AquaSust Water Technology Co., Ltd. Head ofice: #2808, Baiyue Center, Linping, Hangzhou, Zhejiang, China M:+86 152 6746 2807 Email: [email protected] website: www.nihaowater.com www.chinambbr.com www.aquasust.com www.aquasustfactory.com |
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| JunTai-Sewage Treatment Aerobic Tank Oxygen Demand Calculator | ||||
| Blue block is the design datameter: be filled in Brown:calculate process data Red:last result for your process |
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| 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'/a/β | 0.32 | 0.1 | 0.55 | 0.80 |
| kgO2/kgBOD | kgO2/kgMLSS d | Aerationequipment in sewage and clear water Ratio of total oxygen transfer coefficient |
The ratio of saturated DOconcentration 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 |
| Pup 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 poolT | 35 | |||
| 2. Sewage Treatment Aerobic Tank--Oxygen Demand Calculation | ||||
| 1、V(m³) | V=Q*△BOD/(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 02(kgO2/d) | O₂=Q*△BOD*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 oxygeninthe gas |
Ot=21*(1-E)*100/[79+21*(1-ε)] | 18.08 | ||
| 9、Oxygenuilization rate of ε aerator | 0.17 | |||
| 10,T℃ indisilled 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、Calculationof oxygen demand in the standard state | Oc=O₂*Cs₂o/(a*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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