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Let's calculate an estimate of the required solids retention time for a small petroleum refinery stream containing benzene (1850 ppm -> COD = 1850* 3.08 = 5700 mg/L). Please be aware that these calculations are a simplification of the actual project data. For example, actual solids inventories could be smaller or larger and all other derived magnitudes adjusted accordingly. SRT is thus about ballpark.
| SRT Sludge Age Sizer | ||||||||||||
| T | 25 | °C | ||||||||||
| Yoc | 0.5 | Petroleum Refinery Stream | ||||||||||
| Kd | 0.250 | (also called b) | Stream containing about 1850 ppm benzene | |||||||||
| Carbonaceous Removal Sludge Age | ||||||||||||
| flow in | 240 | m3/d | 0.063 | mgd | ||||||||
| CODin | 5700 | mg/L | 3011 | lbCOD/day | 1366 | kgCOD/day | applied | |||||
| 0 | kgCOD/day | via denitrif | ||||||||||
| 1366 | ||||||||||||
| Percent | 100 | % Treated | 1366 | kgCOD/day | ||||||||
| Percent | 98 | % COD removed | ||||||||||
| Vreactor | 190440 | gallon | 721 | m3 | (from order of magnitude sizing) | |||||||
| 0.19044 | mg | 1.89 | kg applied COD/day per m3 | (Residual OK) | ||||||||
| Target MLVSS | 1.89 | kg applied + from denitri COD d/m3 | ||||||||||
| 5320 | mg/L | 8439.463 | lb bugs | 3828 | kg bugs | total bugs in tank but say only | 100.0 | % heterotrophs | ||||
| 5320 | mg/L | 8439.463 | lb bugs | 3828 | kg bugs | (heterotrophic biomass) | ||||||
| SRT | 20.04 | days | (iterates automatically) | |||||||||
| Ync | 0.143 | ok | f/m | 0.357 | kg AppliedCOD d per total kg bugs (Residual OK) | |||||||
| f/m | 0.357 | kg Applied + From Dentir / total kg bugs | ||||||||||
| biomass yield = | 191 | kg/day bugs | due to appliedCOD | |||||||||
| HRT = V / Q = | 3.0 | days | ||||||||||
| 72 | hours | ok | ||||||||||
