An activated sludge plant (CSTR w/ recycle) has the following characteristics: Influent substrate concentration, So = 400 mg/L BODL (all soluble); influent VSS, Xvº = 0; effluent 3 substrate concentration, S = 10 mg/L BODL; flow rate, Q = 1000 m³/day; aeration basin volume, V = 200 m³; reactor MLVSS, Xy = 4,280 mg/L; average, steady-state oxygen uptake rate, Oxygen uptake rate (OUR) = 0.3 mg 02/L-min. The biomass viability (i.e., v = Xa/Xv) was measured using the oxygen uptake rate (OUR) technique and found equal to 0.926. An aliquot of mixed liquor was placed in a small reactor, aerated without any exogenous substrate addition (i.e., starvation conditions) and it's OUR was measured over time resulting in the following data: 0 1 2 3 4 5 6 8 10 Time (days) OUR (mg 02/L-min) 0.3 0.274 0.243 0.222 0.203 0.182 0.165 0.135 0.110 By use of the above data, the microorganism decay coefficient (b, day) can be estimated if you assume that a constant relationship exists between Xa and OUR, i.e., OUR = a Xa, where a = proportionality constant (g O2/g Xa - min). 1. Estimate b (1/d) by using the above data (Use regression). 2. Calculate the solids retention time for this plant. 3. Calculate the net biodegradable fraction of the viable biomass (fd).

Aquaculture Science

3rd Edition

ISBN:9781133558347

Author:Parker

Publisher:Parker

Chapter12: Water Requirements For Aquaculture

Section: Chapter Questions

Problem 24SA

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An activated sludge plant (CSTR w/ recycle) has the following characteristics: Influent
substrate concentration, So = 400 mg/L BODL (all soluble); influent VSS, Xyº = 0; effluent
3
substrate concentration, S = 10 mg/L BODL; flow rate, Q = 1000 m³/day; aeration basin
3
volume, V = 200 m³; reactor MLVSS, Xv = 4,280 mg/L; average, steady-state oxygen
uptake rate, Oxygen uptake rate (OUR) = 0.3 mg 02/L-min. The biomass viability (i.e., v =
Xa/Xv) was measured using the oxygen uptake rate (OUR) technique and found equal to
0.926. An aliquot of mixed liquor was placed in a small reactor, aerated without any
exogenous substrate addition (i.e., starvation conditions) and it's OUR was measured over
time resulting in the following data:
0 1
2
3
4
5
Time (days)
OUR (mg 02/L-min) 0.3 0.274 0.243| 0.222 0.203 0.182
6
8
10
0.165 0.135 0.110
By use of the above data, the microorganism decay coefficient (b, day can be estimated if
you assume that a constant relationship exists between Xa and OUR, i.e., OUR = a Xa, where
a = proportionality constant (g O2/g Xa - min).
1. Estimate b (1/d) by using the above data (Use regression).
2. Calculate the solids retention time for this plant.
3. Calculate the net biodegradable fraction of the viable biomass (fd).

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