Research Article
Statistical Modeling of Environmental Factors on Microbial Urea Hydrolysis Process for Biocement Production
Table 1
Experimental range of amount and levels of the factors.
| Factors | Unit | Symbol | Range of amount and concentration |
| Initial cell concentration | Cell/mL | | 106 | 107 | 108 | Urea concentration | M | | 0.1 | 0.55 | 1 | Temperature | °C | | 20 | 35 | 50 | Level coded | | | −1 | 0 | +1 |
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