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Anaerobic Systems

An OnLine Primer

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ANAEROBIC TREATMENT CASE STUDIES

Let's calculate an estimate of the solids retention time for a number of anaerobic installations using the iterative formula - all data self-explanatory. Please be aware that these calculations are a simplification of the actual operating plant 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 20 °C  
Yo 0.2 EGSB Average Flow
Kd 0.024 High Rate Anaerobic System
flow in 18526 m3/d 4.895 mgd
CODin 5221 mg/L 212870 lbCOD/day 96557 kgCOD/day
DAF rem 0 % COD pretreatment removal by DAF
Percent 100 % COD goes to anaerobic 96557 kgCOD/day to anaerobic reactor or 5221 mg/L
Percent 67 % sCOD removed
Vreactor 2055000 gallon 7778 m3 (from order of magnitude sizing)
2.055 mg 12.41 kgCOD/day per m3
Target MLVSS
24000 mg/L 410835.6 lb bugs 186354 kg bugs
SRT     21.00 days (iterates automatically) f/m 0.518 kgCOD/d per kg bugs
Yn = 0.137
biomass yield = 8876 kg/day bugs
HRT = V / Q = 0.4 days
10 hours

Please be aware that these calculations are a simplification of the actual operating plant data. For example, actual solids inventories could be smaller or bigger and all other derived magnitudes adjusted accordingly. SRT is thus about ballpark.

SRT Sludge Age Sizer
T 20 °C
Yo 0.2 UASB Average Flow
Kd 0.024 High Rate Anaerobic System
flow in 13233 m3/d 3.496 mgd
CODin 3805 mg/L 110813 lbCOD/day 50265 kgCOD/day
DAF rem 0 % COD pretreatment removal by DAF
Percent 100 % COD goes to anaerobic 50265 kgCOD/day to anaerobic reactor or 3805 mg/L
Percent 87 % sCOD removed
Vreactor 2400000 gallon 9084 m3 (from order of magnitude sizing)
2.4 mg 5.53 kgCOD/day per m3
Target MLVSS
35000 mg/L 699720 lb bugs 317391 kg bugs
SRT     91.78 days (iterates automatically) f/m 0.158 kgCOD/d per kg bugs
Yn = 0.079
biomass yield = 3458 kg/day bugs
HRT = V / Q = 0.7 days
16 hours

 

ASB

Willie

Need Some Help? answers@engineeringfundamentals.com - James C. Young Environmental - Balestie, Irwin & Balestie