Comparison of Radial Basis Function Neural Network and Response Surface Methodology for Predicting Performance of Biofilter Treating Toluene

Sharvari C. Deshmukh, J. Senthilnath, Rashmi M. Dixit, Sameena N. Malik, Ram A. Pandey, Atul N. Vaidya, Subbaramajois N. Omkar, Sandeep N. Mudliar

Department of Aerospace Engineering, Indian Institute of Sciences, Bangalore, India.
Environmental Biotechnology Division, National Environmental Engineering and Research Institute, Nagpur, India.
Solid Waste Management Division, National Environmental Engineering and Research Institute, Nagpur, India.

DOI: 10.4236/jsea.2012.58068                

Abstract

Biofiltration is emerging as a promising cost effective technique for the Volatile Organic Compounds (VOCs) removal from industrial waste gases. In the present investigation a comparative modeling study has been carried out using Radial Basis Function Neural Network (RBFN) and Response Surface Methodology (RSM) to predict and optimize the performance of a biofilter system treating toluene (a model VOC). Experimental biofilter system performance data collected over a time period by daily measurement of inlet VOC concentration, retention time, pH, temperature and packing moisture content was used to develop the mathematical model. These independent variables acted as the inputs to the mathematical model developed using RSM and RBFN, while the VOC removal efficiency was the biofilter system performance parameter to be predicted. The data set was divided into two parts: 60% of data was used for training phase and remaining 40% of data was used for the testing phase. The average % error for RSM and RBFN were 7.76% and 3.03%, and R2 value obtained were 0.8826 and 0.9755 respectively. The results indicated the superiority of RBFN in the prediction capability due to its ability to approximate higher degree of nonlinearity between the input and output variables. The optimization of biofilter parameters was also done using RSM to optimize the biofilter performance. RSM being structured in nature enabled the study of interaction effect between the independent variables on biofilter performance.

Keywords

VOC; Toluene; Biofilter; Response Surface Methodology; Radial Basis Function Neural Network

Conflicts of Interest

The authors declare no conflicts of interest.

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