| Autor: |
Caglak A; Civil Engineering Faculty, Environmental Engineering Department, Yildiz Technical University, Istanbul, Turkey., Sari-Erkan H; Civil Engineering Faculty, Environmental Engineering Department, Yildiz Technical University, Istanbul, Turkey., Onkal Engin G; Civil Engineering Faculty, Environmental Engineering Department, Yildiz Technical University, Istanbul, Turkey. |
| Jazyk: |
angličtina |
| Zdroj: |
Environmental technology [Environ Technol] 2024 Jun; Vol. 45 (15), pp. 3076-3094. Date of Electronic Publication: 2023 Apr 27. |
| DOI: |
10.1080/09593330.2023.2206529 |
| Abstrakt: |
The present investigation sought to assess the practicality of utilizing a combined pre-treatment approach comprising electrocoagulation, peroxide, and hypochlorite treatments for the removal of chemical oxygen demand (COD) and tannin/lignin from paper mill wastewater. The study aimed to optimize the operating parameters with a view to maximizing the removal efficiencies while minimizing energy consumption. A pair of iron electrodes were used as anode and cathode in the study, and the main operating parameters were determined as initial pH, applied current, treatment time and oxidant dosage/COD ratio. Response surface methodology (RSM) was used to evaluate the effect of these parameters on COD and tannin/lignin removals. The primary findings of the investigation indicated that the integration of electrocoagulation with peroxide and hypochlorite treatments exhibited efficacy in removing COD, tannin/lignin, colour, phenol, and turbidity from paper mill wastewater. The optimized conditions resulted in COD removal efficiencies of 48.13 ± 2.2% and 29.53 ± 1.4% for EC with H 2 O 2 and Ca(OCl) 2 , respectively. Tannin/lignin removal efficiencies were 92.59 ± 3.6% and 94.09 ± 1.8% for EC-H 2 O 2 and EC-Ca(OCl) 2 , respectively. The specific energy consumption (SEC) values showed that EC-Ca(OCl) 2 required 7 times more energy than EC-H 2 O 2 for removing 1 kg COD. The principal deduction drawn from the study was that EC-H 2 O 2 pre-treatment demonstrated superior COD removal efficiency and lower energy consumption, while EC-Ca(OCl) 2 pre-treatment exhibited greater efficiency in removing toxic and recalcitrant pollutants. In future studies, it would be useful to conduct research to increase COD removal efficiency in addition to tannin/lignin removal in EC-Ca(OCl) 2 process. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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