Statistics for Environmental Engineers

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38.3    Final Clarifier. An activated sludge final clarifier was operated at various levels of overflow rate (OFR) to evaluate the effect of overflow rate (OFR), feed rate, hydraulic detention time, and feed slurry concentration on effluent total suspended solids (TSS) and underflow solids concentration. The temperature was always in the range of 18.5 to 21°C. Runs 11-12, 13-14, and 15-16 are duplicates, so the pure experimental error can be estimated. (a) Construct a polynomial model to predict effluent TSS. (b) Construct a polynomial model to predict underflow solids concentration. (c) Are underflow solids and effluent TSS related?


Run


OFR


(m/d)


Feed


Rate


(m/d)


Detention


Time


(h)


Feed


Slurry


(kg/m3)


Underflow


(kg/m3)


Effluent


TSS


(mg/L)


1


11.1


30.0


2.4


6.32


11.36


3.5


2


11.1


30.0


1.2


6.05


10.04


4.4


3


11.1


23.3


2.4


7.05


13.44


3.9


4


11.1


23.3


1.2


6.72


13.06


4.8


5


16.7


30.0


2.4


5.58


12.88


3.8


6


16.7


30.0


1.2


5.59


13.11


5.2


7


16.7


23.3


2.4


6.20


19.04


4.0


8


16.7


23.3


1.2


6.35


21.39


4.5


9


13.3


33.3


1.8


5.67


9.63

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