Maximizing Secondary Wet Weather Treatment Capacity at ... - pncwa
Maximizing Secondary Wet Weather Treatment Capacity at ... - pncwa
Maximizing Secondary Wet Weather Treatment Capacity at ... - pncwa
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St<strong>at</strong>e Point Analysis to Define Clarifier <strong>Capacity</strong><br />
Solids Loading R<strong>at</strong>e <br />
30<br />
25<br />
= 25.9 ppd/L 2 20<br />
Slope = -‐ RAS r<strong>at</strong>e = 40 MGD <br />
15<br />
10<br />
Depends on SVI <br />
Mass Flux R<strong>at</strong>e, lbs/day/ft2<br />
5<br />
Slope = overflow r<strong>at</strong>e = 1,000 gpd/<br />
L 2 <br />
SVI = 205 mL/g <br />
Ideal Clarifier <br />
Q inf = 125 MGD <br />
MLSS = 2,350 mg/L <br />
SVI = 205 mL/g <br />
RAS = 40 MGD <br />
SLR = 25.9 ppd/L 2 <br />
0<br />
0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000<br />
Concentr<strong>at</strong>ion, mg/L<br />
30<br />
25<br />
Solids flux analysis - the clarifiers failed <strong>at</strong> a<br />
point 40% less than the theoretical capacity<br />
20<br />
15<br />
= 15.2 ppd/L 2 <br />
Solids Loading R<strong>at</strong>e <br />
Mass Flux R<strong>at</strong>e, lbs/day/ft2<br />
10<br />
5<br />
40% deraBng <br />
Q inf = 125 MGD <br />
MLSS = 1,380 mg/L <br />
SVI = 205 mL/g <br />
RAS = 40 MGD <br />
SLR = 15.2 ppd/L 2 <br />
0<br />
0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000<br />
Concentr<strong>at</strong>ion, mg/L
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