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Artificial neural network applied in forecasting the composition of municipal solid waste in Iasi, Romania

    Cristina Ghinea   Affiliation
    ; Petronela Cozma Affiliation
    ; Maria Gavrilescu Affiliation

Abstract

Neural network time series (NNTS) tool was used to predict municipal solid waste composition in Iasi, Romania. The nonlinear input output (NIO) time series model and nonlinear autoregressive model with external (exogenous) input (NARX) included in this tool were selected. The coefficient of determination (R2) and root mean square error (RMSE) were chosen for evaluation. By applying NIO, the optimum model is 4-11-6 artificial neural network (ANN, R2 = 0.929) in the case of testing as for the validation, with all 0.849 and 0.885, respectively. Applying NARX, the suitable model became 4-13-6 ANN model, with R2 = 0.999 for training, 0.879 for testing, and 0.931, respectively 0.944 for validation and all. The resulted RMSE is zero for training and 0.0109 for validation in the case of this model which had 4 inputs, 13 neurons and 6 outputs. The four input variables were: number of residents, population aged 15–59 years, urban life expectancy, total municipal solid waste (ton/year). The suitable ANN model revealed the lowest root mean square error and the highest coefficient of determination. Results indicate that NNTS tool is a complex instrument, NARX is more accurate than NIO model, and can be used and applied easily.

Keyword : artificial neural network, environmental processes modeling, population, solid waste, waste composition, waste management technologies

How to Cite
Ghinea, C., Cozma, P., & Gavrilescu, M. (2021). Artificial neural network applied in forecasting the composition of municipal solid waste in Iasi, Romania. Journal of Environmental Engineering and Landscape Management, 29(3), 368-380. https://doi.org/10.3846/jeelm.2021.15553
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Nov 11, 2021
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