Figure 7 | Scientific Reports

Figure 7

From: Study on the factors of hydrogen sulfide production from lignite bacterial sulfate reduction based on response surface method

Figure 7

Contour and response surface plots of pH under different conditions. (a) Contour plot of temperature and pH affecting pH. (b) Response surface plot of temperature and pH affecting pH. (c) Contour plot of temperature and COD/SO42− affecting pH. (d) Response surface plot of temperature and COD/SO42− affecting sulfur pH. (e) Contour plot of pH and COD/SO42− affecting pH. (f) Contour plot of pH and COD/SO42− influenced pH response surface plots.

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