Application of Adaptive Neural Fuzzy Inference System and Fuzzy C- Means Algorithm in Simulating the 4-Chlorophenol Elimination from Aqueous Solutions by Persulfate/Nano Zero Valent Iron Process

Abstract

This study investigated the application of adaptive neural fuzzy inference system
(ANFIS) and Fuzzy c- means (FCM) algorithm for the simulation and prediction of 4-
chlorophenol elimination in aqueous media by the persulfate/Nano zero valent iron
process. The structure of developed model which resulted to the minimum value of
mean square error was a Gaussian membership function with a total number 10 at
input layer, a linear membership function at output layer and a hybrid optimum
method, which is a combination of backpropagation algorithm and least squares
estimation, for optimization of Gaussian membership function parameters. The
prediction of developed model in elimination 4-chlorophenol was significantly close to
the observed experimental results with R2 value of 0.9942. The results of sensitivity
analysis indicated that all operating variables had a strong effect on the output of
model (4-CP elimination). However, the most effective variable was pH followed by
persulfate, NZVI dosage, reaction time and 4-CP concentration. The performance of
developed model was also compared with a quadratic model generated in a study by
Response Surface Methodology (RSM). The results indicated that the ANFIS-FCM
model was superior to the quadratic model in terms of prediction accuracy and
capturing the behavior of the process.