extremely significantP < 0.01
The effects of A , B , A 2 , B 2 , and C 2 on the TOC removal efficiency are extremely significant ( P < 0.01), while those of C , AB , AC , and BC are not significant ( P > 0.05).
The effects of A , B , A 2 , B 2 , and C 2 on the TOC removal efficiency are extremely significant ( P < 0.01), while those of C , AB , AC , and BC are not significant ( P > 0.05).