Predicting effluent from the wastewater treatment plant of industrial park based on fuzzy network and influent quality

摘要

In this study, three types of adaptive neuro fuzzy inference system (ANFIS) were employed to predict effluent suspended solids (SS_eff), chemical oxygen demand (COD_eff), and pH_eff from a wastewater treatment plant in industrial park. For comparison, artificial neural network (ANN) was also used. The results indicated that ANFIS statistically outperformed ANN in terms of effluent prediction. The minimum mean absolute percentage errors of 2.67%, 2.80%, and 0.42% for SS_eff, COD_eff, and pH_eff could be achieved using ANFIS. The maximum values of correlation coefficient for SS_eff, COD_eff, and pH_eff were 0.96,0.93, and 0.95, respectively. The minimum mean square errors of 0.19, 2.25, and 0.00, and the minimum root mean square errors of 0.43,1.48, and 0.04 for SS_eff, COD_eff, and pH_eff could also be achieved. ANFIS's architecture can overcome the limitations of traditional neural network. It also revealed that the influent indices could be applied to the prediction of effluent quality.