Table 3 Model adaptation results for predicting TV concentrations from the three treatment processes (influent, aerobic, sand) and across different WWTPs (Plant A, Plant H, Plant P1, Plant P2)

Model	Set	Influent				Aerobic				Sand
Model	Set	R²	RMSE	MAE	MSE	R²	RMSE	MAE	MSE	R²	RMSE	MAE	MSE
LSTM	Train	0.903	0.118	0.074	0.014	0.903	0.074	0.049	0.075	0.912	0.107	0.075	0.012
	Test	0.861	0.136	0.081	0.019	0.835	0.143	0.092	0.020	0.874	0.061	0.044	0.004
	Adaptation 1 (A)	0.911	0.109	0.077	0.013	0.882	0.131	0.094	0.018	0.903	0.106	0.077	0.013
	Adaptation 2 (H)	0.956	0.036	0.027	0.002	0.840	0.119	0.091	0.015	0.956	0.021	0.014	0.001
	Adaptation 3 (P1)	0.944	0.071	0.054	0.006	0.902	0.059	0.041	0.004	0.886	0.094	0.070	0.009
	Adaptation 4 (P2)	0.852	0.038	0.029	0.002	0.837	0.153	0.108	0.025	0.874	0.061	0.044	0.004

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