Ensuring the performance of wastewater treatment processes is important to guarantee that the final treated wastewater quality is safe for reuse. However, bacterial concentration present along the different stages of treatment process is not easily measured routinely for the plant operators. In this paper, a moving horizon sensing approach based on neural networks is proposed to estimate the bacterial concentration in wastewater sampled along different stages of the plant. Due to the difficulties to measure the bacteria and the lack of a sufficiently large dataset, a Wasserstein generative adversarial network (WGAN) is designed to generate synthetic data. The Wasserstein critic loss is computed on a held-out validation set to evaluate the WGAN. Then, the generated data is used to train a long short term memory (LSTM) neural network that is developed to predict the biomass concentration and update the LSTM weights by a sliding window learning approach. Two datasets for WWTP are used to test the proposed method: first, effluent concentrations simulated using a benchmark simulation model no.1 (BSM) based on membrane bioreactor (MBR), where three different weather profiles of influent data were considered then, sampled data from MBR plant at King Abdullah University of Science and Technology (KAUST). Finally, the prediction results indicate that WGAN successfully generates realistic samples that are used to train the LSTM neural network. In addition, estimation performance of the proposed method is compared with a multilayer perceptron neural network (MLP-NN). Results showed that the proposed method improves the bacteria estimation performance compared to MLP-NN.
Bibliographical noteKAUST Repository Item: Exported on 2022-01-26
Acknowledged KAUST grant number(s): REI/1/4178-03-01
Acknowledgements: The authors would like to acknowledge the assistance from the KAUST Facilities and Management Utilities Team. This work has been supported by the KAUST, Saudi and Center of Excellence for NEOM research at KAUST, Saudi Arabia flagship project research fund (REI/1/4178-03-01).
ASJC Scopus subject areas
- Modeling and Simulation
- Industrial and Manufacturing Engineering
- Control and Systems Engineering
- Computer Science Applications