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| Hangzhou AquaSust Water Technology Co., Ltd. المقر الرئيسي: #2808, Baiyue Centre, Linping, Hangzhou, Zhejiang, China الهاتف المحمول: +86 152 6746 2807 البريد الإلكتروني: [email protected] الموقع الإلكتروني: www.nihaowater.com www.chinambbr.com www.aquasust.com www.aquasustfactory.com |
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| AquaSust--Advection Air Flotation Tank Calculator | ||||
| Blue block is the design datameter: be filled in Brown:calculate process data Red:last result for your process |
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| Known | ||||
| Q= | 1800 | m³d | Amount of wastewater to be treated | |
| SS= | 700 | mg/L | Suspended solids concentration | |
| Aa/S= | 0.02 | Gas-solid ratio | ||
| P= | 4.2 | atm | Dissolved air pressure | |
| Ca= | 18.5 | mg/L | Saturated solubility of air in water | |
| T₁= | 3 | min | Dissolved air tank residence time | |
| T₂= | 5 | min | Contact time inair flotationtank | |
| Ts= | 30 | min | Residence time inseparation chamber | |
| Vs= | 0.09 | m/min | Rising fow rate in fotation tank | |
| 1. Determination of The Amount of Dissolved Gas Water QR | ||||
| QR= | Aa/S*Sa*Q/Ca(f*P-1)= | 896.1593172 | m³/d | |
| Dissolved gas effciency f= | 0.6 | |||
| Take the returm flow volume Qr= | 900 | m³/d | ||
| 2.Air Flotation Tank Design | ||||
| ①Contact zone volume Vc | ||||
| Vc= | (Q+Qr)*T₂/(24*60)= | 9.375 | m³ | |
| ②Volume of separation area Vs | ||||
| Vs= | (Q+Qr)*T. (24*60)= | 56.25 | m³ | |
| ③Air flotation tank effective water depth H | ||||
| H= | VsTs= | 2.7 | m | |
| ④Area of separation zone As and length L2 | ||||
| As= | Vs/H= | 20.83333333 | m² | |
| Take the pool width B= | 4 | m | ||
| Then the length of the separation zone L2= | As/B= | 5.208333333 | ||
| ⑤Contact area Ac and length L1 | ||||
| Ac= | Vc/H= | 3.472222222 | m² | |
| L₁= | Ac/B= | 0.868055556 | m | |
| ⑥Flotation cell inlet pipe:Dg=200,v=0.9947m/s | ||||
| ⑦Flotation Cell Outlet Pipe:Dg=150 | ||||
| ⑧Collector pipe small hole area S | ||||
| Take the small hole fow rate v₁= | 1 | m/s | ||
| S= | (Q+Qr)/24/3600v₁= | 0.03125 | m² | |
| Take the diameter ofthe small hole D₁= | 0.015 | m | ||
| Thenthe number of holes n= | 4*S13.14*D₁²= | 176.9285209 | individual | |
| The number of holes is taken as aninteger,the mouth of the holes is downward, at anangle of45°to the level,and is staggered intwo rows. | ||||
| ⑨Float tank width L3: | ||||
| Take L3= | 0.8 | m | ||
| The depth h' of the scum tank is set at 1m. The bottom slope i = 0.5, directed toward the sludge discharge pipe. The sludge discharge pipe has a diameter Dg = 200. | ||||
| 3. Dissolved Air Tank Design | ||||
| ① Dissolved air tank volume V₁ | ||||
| V₁= | Q*T₁/(24*60)= | 1.875 | m³ | |
| The dissolved air tank has a diameter D = 1.1 m. The dissolved air section height is 2 m (measured from the centerline of the inlet pipe). An elliptical head is used, with a curved surface height of 275 mm and a straight edge height of 25 mm. The tank has a pressure rating of 10 × 10 Pa. A vent pipe D = 15 m is installed at the top to discharge residual gas, along with a safety valve and pressure gauge. | ||||
| ② Inlet and outlet pipe diameter: Both inlet and outlet pipes use a 100mm diameter, with an internal flow velocity of 1.24 m/s. | ||||
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