Application of Composite Pre-Polymerized Coagulants for the Treatment of High-Strength Industrial Wastewaters
Abstract
:1. Introduction
2. Materials and Methods
2.1. Laboratory Procedure for the Preparation of Novel Composite Coagulants
2.2. Coagulation Experiments Performed by Jar-Tests
2.3. Characterization Methods
2.3.1. Physico-Chemical Properties
2.3.2. Aluminum Species Distribution
2.3.3. Scanning Electron Microscopy (SEM)
2.3.4. Fourier-Transform-Infrared Spectroscopy (FTIR)
2.3.5. X-ray Diffraction Spectroscopy (XRD)
2.3.6. Zeta-Potential and Particle Size Measurements
2.4. Residual Aluminum Concentration
3. Results and Discussion
3.1. Major Physico-Chemical Properties of Prepared Coagulation Agents
3.2. Characterization of New Polymerized Composite Coagulant Agents
3.2.1. Structure Analysis
3.2.2. Morphological Analysis
3.2.3. X-ray Diffraction Spectroscopy (XRD)
3.2.4. Z-potential and Size Measurements
3.3. Coagulation Performance
3.3.1. Tannery Wastewater
3.3.2. Yeast Production Wastewater
3.3.3. Comparison of Industrial Wastewater Treatment Results
3.3.4. Residual Aluminum Concentration
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Coagulant Type | Molar Ratios | Procedure |
---|---|---|
PSiFAC1.5-10-15 (poly–aluminum–ferric–silicate–chloride) | [OH]/[Al]:1.5 [Al]/[Fe]:10 [Al+Fe]/[Si]:15 | 2 mL of 0.5 M FeCl3 solution were added to 20 mL of 0.5 AlCl3 solution under vigorous stirring (0.3 mL/min, 20 rpm). Then, 1.92 mL of pSi solution were added to the resulted FpA solution and, subsequently, 30 mL of base solution were added slowly under magnetic stirring (0.1 mL/min, 70 rpm) in the mixture [30] at T = 30 °C. The composite pre-polymerized material was left under stirring to mature for approximately 1 h and then diluted with water to a final concentration of 0.1 M relative to Al. |
PAPEFAC1.5-10-15 (poly–aluminum–ferric–silicate–chloride) | [OH]/[Al]:1.5 [Al]/[Fe]:10 [Al+Fe]/[APE]:15 | 2 mL of 0.5 M FeCl3 solution were added to 20 mL of 0.5 AlCl3 solution under vigorous stirring (0.3 mL/min, 20 rpm). Then, 0.54 mL of APE solution were added to the resulted FpA solution and, subsequently, 30 mL of base solution were added slowly under magnetic stirring (0.1 mL/min, 70 rpm) in the mixture at T = 30 °C. The composite pre-polymerized material was left under stirring to mature for about 1 h and then diluted with water to a final concentration of 0.1 M relative to Al. |
PAFSiC1.5-15-10 (poly–aluminum–ferric–silicate–chloride) | [OH]/[Al]:1.5 [Fe]/[Si]:15 [Al]/[Si+Fe]:10 | 1.31 mL of pSi solution was added to 15 mL of 0.5 M FeCl3, under vigorous stirring (0.3 mL/min, 20 rpm). Then, the resulted FpSi solution was added to 20 mL of 0.5 M AlCl3 solution and, subsequently, 30 mL of base solution were added slowly, under magnetic stirring (20 rpm) (0.1 mL/min, 70 rpm) in the mixture at T = 30 °C. The composite pre-polymerized material was left under stirring to mature for about 1 h and then diluted with water to a final concentration of 0.1 M relative to Al. |
PFASiC1.5-15-10 (poly–aluminum–ferric–silicate–chloride) | [OH]/[Al]:1.5 [Al]/[Si]:15 [Al+Si]/[Fe]:10 | 1.75 mL of pSi solution was added to 20 mL of 0.5 M AlCl3 solution, under vigorous stirring (0.3 mL/min, 20 rpm). Then, 2.13 mL of FeCl3 solution were added to the resulted ApSi solution, 30 mL of base solution were added slowly under magnetic stirring (0.1 mL/min, 70 rpm) in the mixture at T = 30 °C. The composite pre-polymerized material was left under stirring to mature for about 1 h and then diluted with water to a final concentration of 0.1 M relative to Al. |
PASiC1.5-15 (polyaluminum–silicate–chloride) | [OH]/[Al]:1.5 [Al]/[Si]:15 [Al+Si]/[Fe]:0 | 1.75 mL of pSi solution was added to 20 mL of 0.5 M AlCl3 solution, under vigorous stirring (0.3 mL/min, 20 rpm). Then, 30 mL of base solution were added slowly under magnetic stirring (0.1 mL/min, 70 rpm) in the mixture at T = 30 °C [34]. The composite pre-polymerized material was left under stirring to mature for about 1 h and then diluted with water to a final concentration of 0.1 M relative to Al. |
PACl1.5(lab) (polyaluminum–chloride) | [OH]/[Al]:1.5 | 30 mL of base solution were added slowly under magnetic stirring (0.1 mL/min, 70 rpm) to 20 mL of 0.5 M AlCl3 solution, at T = 30 °C. The composite pre-polymerized material was left under stirring to mature for about 1 h and then diluted with water to a final concentration of 0.1 M relative to Al. |
Type of Wastewater Samples to be Treated | Turbidity (NTU) | COD (Chemical Oxygen Demand) (mg/L) | Phosphates (mg/L) |
---|---|---|---|
Tannery wastewater | 668 | 6800 | 1.76 |
Yeast wastewater (after anaerobic treatment) | 418 | 11,455 | 3.49 |
Yeast wastewater (the previous, but after the additional post-aerobic treatment as well) | 143 | 4590 | 2.40 |
Coagulant Type | pH | Turbidity (NTU) | Conductivity (mS/cm) | Aluminum Species Distribution Al (%) | ||
---|---|---|---|---|---|---|
Ala | Alb | Alc | ||||
PAFSiC1.5-15-10 | 3.9 | 117.0 | 24.0 | 68 | 22 | 10 |
PFASiC1.5-15-10 | 3.9 | 256.0 | 24.4 | 74 | 21 | 5 |
PSiFAC1.5-10-15 | 3.5 | 211.0 | 23.7 | 44 | 51 | 5 |
PAPEFAC1.5-10-15 | 3.6 | 137.0 | 27.0 | 51 | 43 | 6 |
PACl1.5(lab) | 3.8 | 2.1 | 21.4 | 47 | 39 | 14 |
% (w/w) | PAFSiC1.5-15-10 | PFASiC1.5-15-10 | PSiFAC1.5-10-15 |
---|---|---|---|
Na | 11.48 | 2.96 | 2.23 |
O | 35.46 | 44.66 | 43.89 |
Cl | 33.29 | 28.49 | 26.91 |
Al | 11.47 | 15.61 | 17.01 |
Fe | 4.07 | 4.73 | 5.78 |
Si | 0.03 | 0.67 | 1.36 |
Coagulant | Initial pH | Initial Zeta-Potential (mV) | Initial Size (nm) | Iso-Electric Point (IEP) |
---|---|---|---|---|
PSiFAC15-10-15 | 4.87 | 50.5 | 189 | 9.10 |
PAPEFAC1.5-10-15 | 2.52 | 39.2 | 245 | 9.56 |
PASiC1.5-15 | 3.63 | 35.9 | 216 | 9.40 |
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Tolkou, A.K.; Zouboulis, A.I. Application of Composite Pre-Polymerized Coagulants for the Treatment of High-Strength Industrial Wastewaters. Water 2020, 12, 1258. https://doi.org/10.3390/w12051258
Tolkou AK, Zouboulis AI. Application of Composite Pre-Polymerized Coagulants for the Treatment of High-Strength Industrial Wastewaters. Water. 2020; 12(5):1258. https://doi.org/10.3390/w12051258
Chicago/Turabian StyleTolkou, Athanasia K., and Anastasios I. Zouboulis. 2020. "Application of Composite Pre-Polymerized Coagulants for the Treatment of High-Strength Industrial Wastewaters" Water 12, no. 5: 1258. https://doi.org/10.3390/w12051258
APA StyleTolkou, A. K., & Zouboulis, A. I. (2020). Application of Composite Pre-Polymerized Coagulants for the Treatment of High-Strength Industrial Wastewaters. Water, 12(5), 1258. https://doi.org/10.3390/w12051258