Statistics for Environmental Engineers

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0


0


35


29


0


0


0


0


34


30


0


0


0


0


36

43.4 Chrome Waste Solidification. Fine solid precipitates from lime neutralization of liquid effluents from surface finishing operations in stainless steel processing are treated by cement-based solidification. The solidification performance was explored in terms of water-to-solids ratio (W/S), cement content (C), and curing time (T). The responses were indirect tensile strength (ITS), leachate pH, and leachate chromium concentration. The desirable process will have high ITS, pH of 6 to 8, and low Cr. The table below gives the results of a central composite design that can be used to estimate quadratic effects. Evaluate the data. Recommend additional experiments if you think they are needed to solve the problem.


© 2002 By CRC Press LLC


Run


W/S


C


(%)


T


(days)


ITS


(MPa)


Leachate


pH


Leachate


Cr


1


1.23


14.1


37


0.09


5.6


1.8


2


1.23


25.9


37


0.04


7.5


4.6


3


1.23


25.9


61


0.29


7.4


3.8


4


1.13


25.9


61


0.35


7.5


4.8


5


1.23


14.1


61


0.07


5.5


2.5


6


1.13


25.9


37


0.01


7.9


6.2

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