Fig 1.
A2O method urban sewage treatment simulation device.
Table 1.
Specific materials for sewage preparation.
Table 2.
Partial sample data.
Fig 2.
Correlation analysis.
Table 3.
COD correlation coefficient.
Table 4.
Correlation coefficient between input variables.
Fig 3.
LSTM structure diagram.
Fig 4.
BiLSTM structure diagram.
Fig 5.
Structural diagram of attention mechanism.
Fig 6.
CNN-BiLSTM-Attention model flow chart.
Table 5.
The hyperparameter search space settings.
Table 6.
Description of optimal model parameters.
Fig 7.
(a) Comparison between true and predicted values in the test set (b) Prediction error distribution density distribution map.
Fig 8.
Comparison of COD prediction results.
Table 7.
Comparison of evaluation indicators for different models.
Table 8.
Descriptive statistics.
Table 9.
Wilcoxon signed-ranks test.
Table 10.
Test statistics.