title: A fuzzy neural network model for monitoring A²/O process using on-line monitoring parameters.
abstract: An adaptive network based fuzzy inference system (ANFIS) model was employed to predict effluent chemical oxygen demand (COD(eff)) and ammonia nitrogen (NH(4)(+) (eff)) from an anaerobic/anoxic/oxic (A(2)/O) process, and meanwhile a self-adapted fuzzy c-means clustering algorithm was used to identify the model's architecture and optimize fuzzy rules. When constructing the model or predicting, the on-line monitoring parameters, namely hydraulic retention time (HRT), influent pH (pH), dissolved oxygen in the aerobic reactor (DO) and mixed-liquid return ratio (r), were adopted as the input variables. Compared with the artificial neural network (ANN) model whose weight vector was optimized by a real-code genetic algorithm (GA), the ANFIS presented better estimate performance. When predicting, the mean absolute percentage errors (MAPEs) of 1.8458% and 2.8984% for COD(eff) and NH(4)(+) (eff) could be achieved using ANFIS; the root mean square errors (RMSEs) for COD(eff) and NH(4)(+) (eff) were 1.6317 and 0.1291, respectively; the correlation coefficient (R) values of 0.9928 and 0.9951 for COD(eff) and NH(4)(+) (eff) could also be achieved. The results indicated that reasonable monitoring A(2)/O process performance, just using on-line monitoring parameters, has been achieved through the ANFIS.
authors.affiliation: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China.
authors.forename: Kang
authors.initials: K
authors.lastname: Hu
authors.forename: Jin Q
authors.initials: JQ
authors.lastname: Wan
authors.forename: Yong W
authors.initials: YW
authors.lastname: Ma
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Ming Z
authors.initials: MZ
authors.lastname: Huang
mesh_terms: D000332:Aerobiosis; D000465:Algorithms; D000693:Anaerobiosis; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D003198:Computer Simulation; D017143:Fuzzy Logic; D008962:Models, Theoretical; D016571:Neural Networks, Computer; D009862:Online Systems; D000644:Quaternary Ammonium Compounds / Q000032:analysis* / Q000378:metabolism; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism
chemical_list: D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical