Turbidity and Chemical Oxygen Demand Reduction from Pig Slurry through a Coagulation Flocculation Process
Abstract
:1. Introduction
2. Materials and Methods
2.1. Location of the Pig Slurry Farm
2.2. Pig Slurry Sample Collection
2.3. Analytical Methods and Equipment
2.4. Physical–Chemical Characteristics of the Pig Slurry
2.5. Design of Coagulation–Flocculation Assay
2.6. Design of the Experiments and Statistical Analysis
3. Results and Discussion
3.1. Coagulation–Flocculation Assay
3.2. Optimal Combination of Coagulant, Flocculent, and pH
Model Term | Estimate of the Coefficient | p-Value |
---|---|---|
Intercept | 81.21 | <2 × 10−16 |
x1 (Normalized coagulation) | 0.13 | 0.88 |
x3 (Normalized pH) | −0.16 | 0.85 |
x12 | 1.93 | 0.03 |
x32 | 2.30 | 0.01 |
3.2.1. Effect of Flocculent and Coagulant Concentration Parameters on Turbidity and COD Removal
3.2.2. Effects of pH Parameter on Turbidity and COD Removal
3.2.3. Influence of the Two Variables, Coagulant Concentration and pH, on COD Response
4. Conclusions
Author Contributions
Funding
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Raw Pig Slurry | After Pretreatment (The Five-Step Process) | After Treatment with CF Process in Optimal Conditions | |
---|---|---|---|
pH | 7.63 | 7.88 | 6.4 |
EC (ms cm −1) | 9.10 | 8.76 | 8 |
SM (g L−1) | 80 | 30 | 0 |
BOD5 (mg L−1) | 5300 | 4200 | 400 |
COD (g L−1) | 11.2 | 8.94 | 1.29 |
Turbidity (NTU) | 3500 | 2110 | 2.11 |
Run Order | Coag mol L−1 | Floc µL | pH | Blk |
---|---|---|---|---|
1 | 0.0248 | 164.9 | 7.90 | 1 |
2 | 0.0260 | 140.0 | 7.74 | 1 |
3 | 0.0248 | 115.1 | 7.58 | 1 |
4 | 0.0260 | 140.0 | 7.74 | 1 |
5 | 0.0272 | 115.1 | 7.90 | 1 |
6 | 0.0272 | 164.9 | 7.58 | 1 |
7 | 0.0260 | 140.0 | 7.74 | 1 |
1 | 0.0272 | 115.1 | 7.58 | 2 |
2 | 0.0260 | 140.0 | 7.74 | 2 |
3 | 0.0260 | 140.0 | 7.74 | 2 |
4 | 0.0272 | 164.9 | 7.90 | 2 |
5 | 0.0260 | 140.0 | 7.74 | 2 |
6 | 0.0248 | 164.9 | 7.58 | 2 |
7 | 0.0248 | 115.1 | 7.90 | 2 |
1 | 0.0260 | 180.0 | 7.74 | 3 |
2 | 0.0240 | 140.0 | 7.74 | 3 |
3 | 0.0260 | 140.0 | 7.74 | 3 |
4 | 0.0280 | 140.0 | 7.74 | 3 |
5 | 0.0260 | 140.0 | 7.74 | 3 |
6 | 0.0260 | 140.0 | 7.74 | 3 |
7 | 0.0260 | 140.0 | 8.00 | 3 |
8 | 0.0260 | 100.0 | 7.74 | 3 |
9 | 0.0260 | 140.0 | 7.48 | 3 |
Run Order | Coag mol L −1 | Floc µL | pH | % COD Removal | % TURB Removal |
---|---|---|---|---|---|
1 | 0.024 | 164.94 | 7.90 | 85.57 | 99.76 |
2 | 0.026 | 140 | 7.74 | 82.10 | 98.29 |
3 | 0.024 | 115.06 | 7.57 | 85.79 | 99.15 |
4 | 0.026 | 140 | 7.74 | 80.98 | 99.83 |
5 | 0.027 | 115.06 | 7.90 | 88.59 | 99.07 |
6 | 0.027 | 164.94 | 7.57 | 87.13 | 97.95 |
7 | 0.026 | 140 | 7.74 | 77.62 | 99.78 |
1 | 0.027 | 115.06 | 7.57 | 86.01 | 99.86 |
2 | 0.026 | 140 | 7.74 | 83.10 | 98.57 |
3 | 0.026 | 140 | 7.74 | 72.03 | 99.86 |
4 | 0.027 | 164.94 | 7.90 | 84.45 | 99.82 |
5 | 0.026 | 140 | 7.74 | 80.98 | 98.48 |
6 | 0.024 | 164.94 | 7.57 | 88.25 | 99.90 |
7 | 0.024 | 115.06 | 7.90 | 84.11 | 97.94 |
1 | 0.026 | 179.99 | 7.74 | 83.22 | 99.74 |
2 | 0.024 | 140 | 7.74 | 85.12 | 99.77 |
3 | 0.026 | 140 | 7.74 | 85.34 | 98.13 |
4 | 0.028 | 140 | 7.74 | 84.67 | 99.89 |
5 | 0.026 | 140 | 7.74 | 84.00 | 96.32 |
6 | 0.026 | 140 | 7.74 | 78.74 | 99.88 |
7 | 0.026 | 140 | 7.99 | 86.57 | 99.94 |
8 | 0.026 | 100 | 7.74 | 83.66 | 97.30 |
9 | 0.026 | 140 | 7.48 | 85.12 | 99.88 |
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El bied, O.; Kessler, M.; Terrero, M.A.; Fechtali, T.; Cano, A.F.; Acosta, J.A. Turbidity and Chemical Oxygen Demand Reduction from Pig Slurry through a Coagulation Flocculation Process. Agronomy 2021, 11, 2158. https://doi.org/10.3390/agronomy11112158
El bied O, Kessler M, Terrero MA, Fechtali T, Cano AF, Acosta JA. Turbidity and Chemical Oxygen Demand Reduction from Pig Slurry through a Coagulation Flocculation Process. Agronomy. 2021; 11(11):2158. https://doi.org/10.3390/agronomy11112158
Chicago/Turabian StyleEl bied, Oumaima, Mathieu Kessler, Martire Angélica Terrero, Taoufiq Fechtali, Angel Faz Cano, and José A. Acosta. 2021. "Turbidity and Chemical Oxygen Demand Reduction from Pig Slurry through a Coagulation Flocculation Process" Agronomy 11, no. 11: 2158. https://doi.org/10.3390/agronomy11112158