Nutrient Removal Project

Mellie-Mel Tan

Johnbwai Kim

Joey T

Effect of Mixed Liquor Volatile Suspended Solids (MLVSS) Concentration on B.O.D. Removal

• D.O. consumption as indicator • Settle time as variable• MLVSS Concentration Tests

D.O. levels give uptake rate

Time integral = total B.O.D. consumed

Waste C.O.D. known

Ratio observed to known = efficiency

Dissolved Oxygen As Indicator

Dissolved Oxygen as Indicator

,ˆ ( * )v l

dCk C C

dt= -

C*

C

t

Theoretical

dX YkSXb

dt Ks S

Dissolved Oxygen as Indicator

C*

Dissolved Oxygen as Indicator

Settle time as variable

Apparent Intercept

Cell Growth

Settle time as variable

Figure : Efficiency versus Settle Time

Third and Fourth

Second

First

FirstSecond

Third

Fourth

Fifth

Sixth

0.0%

20.0%

40.0%

60.0%

80.0%

100.0%

120.0%

0 1000 2000 3000 4000 5000 6000 7000

Settle Time (s)

Effic

ienc

y

0 1000 2000 3000 4000 5000 6000

Settle Time

100 %

Eff

icie

ncy

MLVSS Concentration Tests

Laboratory Hazards

MLVSS Concentration Tests

Figure : Efficiency vs Concentration

0%

20%

40%

60%

80%

100%

120%

140%

0 500 1000 1500 2000 2500 3000MLVSS Concentration (mg/L)

Eff

icie

ncy

MLVSS Concentration Tests

High variability

Growth

Summarizing The Strange

Oscillating DO acquisition Steadily decreasing D.O. values Missing samples Kv,l anyone?

The Bermuda

Triangle of

Concentration

Samples

In Conclusion

1 ft

Thank You!

Questions?