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Anaerobic Filters

An OnLine Primer

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INDUSTRIAL WASTEWATER 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 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

20

°C

 

Yo

0.1

Cheese Whey WWTP

Kd

0.024

Hybrid Anaerobic Filter

flow in

200

m3/d

0.053

mgd

CODin

45000

mg/L

19807

lbCOD/day

8984

kgCOD/day

DAF rem

0

% COD pretreatment removal by DAF

Percent

100

% COD goes to anaerobic

8984

kgCOD/day to anaerobic reactor

or

45000

mg/L

Percent

98

% sCOD removed

Vreactor

185500

gallon

702

m3

(from order of magnitude sizing)

0.1855

mg

12.80

kgCOD/day per m3

Target MLVSS

25000

mg/L

38630.38

lb bugs

17523

kg bugs

SRT   

33.79

days

(iterates automatically)

f/m

0.513

kgCOD/d per kg bugs

Yn =

0.059

biomass yield =

519

kg/day bugs

HRT = V / Q =

3.5

days

84

hours

ASB

Willie

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