Abstract
The effectiveness of using complex salt–Luffa cylindrica seed extract (CS-LCSE) in a coagulation/flocculation (CF) method for the treatment of textile wastewater was investigated. Jar test procedure was used at different pH (2–10), dosage (1000–1800 mg/L) and stirring time (10–30 min). The optimum condition for the removal of chemical oxygen demand (COD) and color/total suspended solids (CTSS) from textile wastewater was determined. Response surface methodology (RSM), artificial neural network (ANN) and adaptive neuro-fuzzy inference system (ANFIS) models were used to predict COD and CTSS removal efficiencies from textile wastewater under different conditions. The adequacy and predictive relevance of the three optimization methods were assessed using regression coefficient (R2), and mean square error (MSE). ANFIS (R2 0.9997, MSE 0.0002643), ANN (R2 0.9955, MSE 0.0845014) and RSM (R2 0.9474, MSE 1.049412) are the model indicators for CTSS removal, while for COD removal, the indicators are: ANFIS (R2 0.9996, MSE 0.0038472), ANN (R2 0.9885, MSE 0.0160658) and RSM (R2 0.9731, MSE 0.9083140). The suitability of ANFIS models over ANN and RSM in predicting COD and CTSS removal efficiency is demonstrated by the results obtained.
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Abbreviations
- Adj R 2 :
-
Adjusted coefficient of determination
- ANN:
-
Artificial neural network
- ANFIS:
-
Adaptive neuro-fuzzy inference system
- BBD:
-
Box–Behnken design
- BOD:
-
Biochemical oxygen demand
- CF:
-
Coagulation/flocculation
- COD:
-
Chemical oxygen demand
- CS:
-
Complex salt
- CTSS:
-
Color/total suspended solids
- FTIR:
-
Fourier transform infrared spectroscopy
- GA:
-
Genetic algorithm
- LCS:
-
Luffa cylindrica seed
- LCSE:
-
Luffa cylindrica seed extract
- MSE:
-
Mean square error
- R 2 :
-
Coefficient of determination
- RSM:
-
Response surface methodology
- SEM:
-
Scanning electron microscope
- TSK:
-
Takagi–Sugeno fuzzy
- TW:
-
Textile wastewater
- XRD:
-
X-ray diffraction
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Acknowledgements
V.C. Anadebe is grateful to CSIR, India, and TWAS, Italy, for the Postgraduate Fellowship (Award No. 22/FF/CSIR-TWAS/2019) to purse research program in CSIR-CECRI, India. In addition, Alex Ekwueme Federal University Ndufu-Alike Ebonyi State, Nigeria, is acknowledged for the Research Leave to visit CECRI, India.
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Nnaji, P.C., Anadebe, V.C., Onukwuli, O.D. et al. Multifactor optimization for treatment of textile wastewater using complex salt–Luffa cylindrica seed extract (CS-LCSE) as coagulant: response surface methodology (RSM) and artificial intelligence algorithm (ANN–ANFIS). Chem. Pap. 76, 2125–2144 (2022). https://doi.org/10.1007/s11696-021-01971-7
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DOI: https://doi.org/10.1007/s11696-021-01971-7