Statistics for Environmental Engineers

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5.4


10


13.3


20.0


1.8


7.43


20.55


3.0


11


13.3


26.7


3.0


6.06


12.20


3.7


12


13.3


26.7


3.0


6.14


12.56


3.6


13


13.3


26.7


0.6


6.36


11.94


6.9


14


13.3


26.7


0.6


5.40


10.57


6.9


15


13.3


26.7


1.8


6.18


11.80


5.0


16


13.3


26.7


1.8


6.26


12.12


4.0

Source: Adapted from Deitz J. D. and T. M. Keinath, J. WPCF, 56, 344-350. (Original values have been rounded.)


38.4 Final Clarification. The influence of three factors on clarification of activated sludge effluent was investigated in 36 runs. Three runs failed because of overloading. The factors were solids retention time = SRT, hydraulic retention time = HRT, and overflow rate (OFR). Interpret the data.


Run


SRT


(d)


HRT


(h)


OFR


(m/d)


Eff TSS (mg/L)


Run


SRT


(d)


HRT


(h)


OFR


(m/d)


Eff TSS (mg/L)


1


8


12


32.6


48


19


5


12


16.4


18


2


8


12


32.6


60


20


5


12


8.2


15


3


8


12


24.5


55


21

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