UASBEGSBsLogo
HomeFundamentalsApplicationsLibraryCaseStudiesDownloadsLinksContactUsCredits

 

 

Expanded Granular Sludge Bed Systems - EGSBs

An OnLine Primer

Need to know more? Send us an email or feel free to search our online series with our give away search engine:

www.PocketGoogle.com


ANAEROBIC TREATMENT CASE STUDIES

Let's calculate an estimate of the solids retention time for two EGSB 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 # 1 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

 

As said before, please be aware that these calculations are a simplification of the actual operating plant data. 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 # 2 Average Flow
Kd 0.024 High Rate Anaerobic System
flow in 15273 m3/d 4.035 mgd
CODin 4860 mg/L 163358 lbCOD/day 74099 kgCOD/day
DAF rem 0 % COD pretreatment removal by DAF
Percent 100 % COD goes to anaerobic 74099 kgCOD/day to anaerobic reactor or 4860 mg/L
Percent 76 % sCOD removed
Vreactor 960000 gallon 3634 m3 (from order of magnitude sizing)
0.96 mg 20.39 kgCOD/day per m3
Target MLVSS
62000 mg/L 495801.6 lb bugs 224894 kg bugs
SRT     33.96 days (iterates automatically) f/m 0.329 kgCOD/d per kg bugs
Yn = 0.118
biomass yield = 6622 kg/day bugs
HRT = V / Q = 0.2 days
6 hours

 

ASB

Willie

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