Remediation of washing machine wastewater by photo-enhanced persulfate/hematite process

Environmental Processes - Tập 7 - Trang 537-551 - 2020
Masoumeh Khatebasreh1, Rahil Kiani2, Elham Minaee Tabrizi3, Gelavizh Barzegar4, Zohreh Bahmani5, Maryam Yousefi6, Farshid Ghanbari7
1Environmental Science and Technology Research Center, Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
2Student Research Committee, Abadan Faculty of Medical Sciences, Abadan, Iran
3Department of Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran
4Department of Environmental Health Engineering, Behbahan Faculty of Medical Sciences, Behbahan, Iran
5Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
6Student research committee, Mazandaran university of medical sciences, Sari, Iran
7Department of Environmental Health Engineering, Abadan Faculty of Medical Sciences, Abadan, Iran

Tóm tắt

Hematite nanoparticles (Fe2O3, HNPs) were synthesized to be used in washing machine wastewater treatment as a complex matrix. In order to activate persulfate (PS), HNPs and Ultraviolet-C (UVC) radiation were used to generate sulfate radicals due to photocatalytic activity of HNPs and higher energy input of UVC. The effect of operational parameters such as pH, catalyst dose, PS concentration and reaction time was investigated. The results showed that PS/UV/HNPs could remove organic pollutants from washing machine wastewater. Based on the results, the PS/UV/HNPs process can effectively remove chemical oxygen demand (COD) (77.5%) and total organic carbon (TOC) (65.9%) at optimal conditions (pH = 7, PS = 8 mM, HNPs =1.0 g/L) within 150 min. The COD and TOC removals followed a pseudo-first-order kinetic model with the rate constants of 0.0109 and 0.0074 min−1, respectively. Reusability experiments revealed that HNPs could keep its performance for three-time use. The electrical energy was also calculated: 158.7 kWh/m3 is required to reach 77.5% COD removal. Based on the achieved results, it can be concluded that the PS/UV/HNPs process is an effective process for COD and TOC removals in washing machine wastewater.

Tài liệu tham khảo

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