Comparison of Fenton and Ozone Oxidation for Pretreatment of Petrochemical Wastewater: COD Removal and Biodegradability Improvement Mechanism
Cost-effective pretreatment of highly concentrated and bio-refractory petrochemical wastewater to improve biodegradability is of significant importance, but remains challenging. This study compared the pretreatment of petrochemical wastewater by two commonly used chemical advanced oxidation technolo...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-07-01
|
| Series: | Separations |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2297-8739/9/7/179 |
| _version_ | 1827604205293010944 |
|---|---|
| author | Siyu Cheng Xiaomeng Ran Gengbo Ren Zizhang Wei Zhimin Wang Tiantong Rao Ruixuan Li Xiaodong Ma |
| author_facet | Siyu Cheng Xiaomeng Ran Gengbo Ren Zizhang Wei Zhimin Wang Tiantong Rao Ruixuan Li Xiaodong Ma |
| author_sort | Siyu Cheng |
| collection | DOAJ |
| description | Cost-effective pretreatment of highly concentrated and bio-refractory petrochemical wastewater to improve biodegradability is of significant importance, but remains challenging. This study compared the pretreatment of petrochemical wastewater by two commonly used chemical advanced oxidation technologies (Fenton and ozone oxidation), and the mechanisms of biodegradability improvement of pretreated wastewater were explored. The obtained results showed that in the Fenton oxidation system, the COD removal of petrochemical wastewater was 89.8%, BOD<sub>5</sub> decreased from 303.66 mg/L to 155.49 mg/L, and BOD<sub>5</sub>/COD (B/C) increased from 0.052 to 0.62 after 60 min under the condition of 120 mg/L Fe<sup>2+</sup> and 500 mg/L H<sub>2</sub>O<sub>2,</sub> with a treatment cost of about 1.78 $/kg<sub>COD</sub>. In the ozone oxidation system, the COD removal of petrochemical wastewater was 59.4%, BOD<sub>5</sub> increased from 127.86 mg/L to 409.28 mg/L, and B/C increased from 0.052 to 0.41 after 60 min at an ozone flow rate of 80 mL/min with a treatment cost of approximately 1.96 $/kg<sub>COD</sub>. The petrochemical wastewater treated by both processes meets biodegradable standards. The GC–MS analysis suggested that some refractory pollutants could be effectively removed by ozone oxidation, but these pollutants could be effectively degraded by hydroxyl radicals (<sup>•</sup>OH) produced by the Fenton reaction. In summary, compared with ozone oxidation, petrochemical wastewater pretreated with Fenton oxidation had high COD removal efficiency and biodegradability, and the treatment cost of Fenton oxidation was also lower than that of ozone oxidation. |
| first_indexed | 2024-03-09T05:55:45Z |
| format | Article |
| id | doaj.art-e2f01036285c4b8ebbd012df2ab75aec |
| institution | Directory Open Access Journal |
| issn | 2297-8739 |
| language | English |
| last_indexed | 2024-03-09T05:55:45Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Separations |
| spelling | doaj.art-e2f01036285c4b8ebbd012df2ab75aec2023-12-03T12:14:12ZengMDPI AGSeparations2297-87392022-07-019717910.3390/separations9070179Comparison of Fenton and Ozone Oxidation for Pretreatment of Petrochemical Wastewater: COD Removal and Biodegradability Improvement MechanismSiyu Cheng0Xiaomeng Ran1Gengbo Ren2Zizhang Wei3Zhimin Wang4Tiantong Rao5Ruixuan Li6Xiaodong Ma7Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environment Engineering, Hebei University of Technology, Tianjin 300401, ChinaTianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environment Engineering, Hebei University of Technology, Tianjin 300401, ChinaTianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environment Engineering, Hebei University of Technology, Tianjin 300401, ChinaTianjin Academy of Eco-Environmental Sciences, Tianjin 300191, ChinaTianjin Academy of Eco-Environmental Sciences, Tianjin 300191, ChinaTianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environment Engineering, Hebei University of Technology, Tianjin 300401, ChinaTianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environment Engineering, Hebei University of Technology, Tianjin 300401, ChinaTianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environment Engineering, Hebei University of Technology, Tianjin 300401, ChinaCost-effective pretreatment of highly concentrated and bio-refractory petrochemical wastewater to improve biodegradability is of significant importance, but remains challenging. This study compared the pretreatment of petrochemical wastewater by two commonly used chemical advanced oxidation technologies (Fenton and ozone oxidation), and the mechanisms of biodegradability improvement of pretreated wastewater were explored. The obtained results showed that in the Fenton oxidation system, the COD removal of petrochemical wastewater was 89.8%, BOD<sub>5</sub> decreased from 303.66 mg/L to 155.49 mg/L, and BOD<sub>5</sub>/COD (B/C) increased from 0.052 to 0.62 after 60 min under the condition of 120 mg/L Fe<sup>2+</sup> and 500 mg/L H<sub>2</sub>O<sub>2,</sub> with a treatment cost of about 1.78 $/kg<sub>COD</sub>. In the ozone oxidation system, the COD removal of petrochemical wastewater was 59.4%, BOD<sub>5</sub> increased from 127.86 mg/L to 409.28 mg/L, and B/C increased from 0.052 to 0.41 after 60 min at an ozone flow rate of 80 mL/min with a treatment cost of approximately 1.96 $/kg<sub>COD</sub>. The petrochemical wastewater treated by both processes meets biodegradable standards. The GC–MS analysis suggested that some refractory pollutants could be effectively removed by ozone oxidation, but these pollutants could be effectively degraded by hydroxyl radicals (<sup>•</sup>OH) produced by the Fenton reaction. In summary, compared with ozone oxidation, petrochemical wastewater pretreated with Fenton oxidation had high COD removal efficiency and biodegradability, and the treatment cost of Fenton oxidation was also lower than that of ozone oxidation.https://www.mdpi.com/2297-8739/9/7/179Fenton oxidationozone oxidationpetrochemical wastewaterbiodegradabilityGC–MS analysis |
| spellingShingle | Siyu Cheng Xiaomeng Ran Gengbo Ren Zizhang Wei Zhimin Wang Tiantong Rao Ruixuan Li Xiaodong Ma Comparison of Fenton and Ozone Oxidation for Pretreatment of Petrochemical Wastewater: COD Removal and Biodegradability Improvement Mechanism Separations Fenton oxidation ozone oxidation petrochemical wastewater biodegradability GC–MS analysis |
| title | Comparison of Fenton and Ozone Oxidation for Pretreatment of Petrochemical Wastewater: COD Removal and Biodegradability Improvement Mechanism |
| title_full | Comparison of Fenton and Ozone Oxidation for Pretreatment of Petrochemical Wastewater: COD Removal and Biodegradability Improvement Mechanism |
| title_fullStr | Comparison of Fenton and Ozone Oxidation for Pretreatment of Petrochemical Wastewater: COD Removal and Biodegradability Improvement Mechanism |
| title_full_unstemmed | Comparison of Fenton and Ozone Oxidation for Pretreatment of Petrochemical Wastewater: COD Removal and Biodegradability Improvement Mechanism |
| title_short | Comparison of Fenton and Ozone Oxidation for Pretreatment of Petrochemical Wastewater: COD Removal and Biodegradability Improvement Mechanism |
| title_sort | comparison of fenton and ozone oxidation for pretreatment of petrochemical wastewater cod removal and biodegradability improvement mechanism |
| topic | Fenton oxidation ozone oxidation petrochemical wastewater biodegradability GC–MS analysis |
| url | https://www.mdpi.com/2297-8739/9/7/179 |
| work_keys_str_mv | AT siyucheng comparisonoffentonandozoneoxidationforpretreatmentofpetrochemicalwastewatercodremovalandbiodegradabilityimprovementmechanism AT xiaomengran comparisonoffentonandozoneoxidationforpretreatmentofpetrochemicalwastewatercodremovalandbiodegradabilityimprovementmechanism AT gengboren comparisonoffentonandozoneoxidationforpretreatmentofpetrochemicalwastewatercodremovalandbiodegradabilityimprovementmechanism AT zizhangwei comparisonoffentonandozoneoxidationforpretreatmentofpetrochemicalwastewatercodremovalandbiodegradabilityimprovementmechanism AT zhiminwang comparisonoffentonandozoneoxidationforpretreatmentofpetrochemicalwastewatercodremovalandbiodegradabilityimprovementmechanism AT tiantongrao comparisonoffentonandozoneoxidationforpretreatmentofpetrochemicalwastewatercodremovalandbiodegradabilityimprovementmechanism AT ruixuanli comparisonoffentonandozoneoxidationforpretreatmentofpetrochemicalwastewatercodremovalandbiodegradabilityimprovementmechanism AT xiaodongma comparisonoffentonandozoneoxidationforpretreatmentofpetrochemicalwastewatercodremovalandbiodegradabilityimprovementmechanism |