Optimization of Ammonia Stripping of Piggery Biogas Slurry by Response Surface Methodology.

The p- value of the quadratic polynomial regression model is less than 0.01 and reaches an extremely significant level, indicating that the relationship between independent variables and dependent variables described in the regression model is highly significant; the p- values of the single terms A, B and C are all less than 0.01, indicating that the linear relationships between the single terms and the ammon

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The p- value of the quadratic polynomial regression model is less than 0.01 and reaches an extremely significant level, indicating that the relationship between independent variables and dependent variables described in the regression model is highly significant; the p- values of the single terms A, B and C are all less than 0.01, indicating that the linear relationships between the single terms and the ammonia nitrogen removal rate Y are extremely significant; the p- value of the quadratic term BC is less than 0.05, indicating that the surface effect of this term on the ammonia nitrogen removal rate Y is significant; the p -values of AB, AC, A 2 , B 2 and C 2 are larger than 0.05, indicating that their surface effects on the ammonia nitrogen removal rate Y are not significant.

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