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Journal of Cleaner Production

Journal of Cleaner Production

IF: 9.69
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Efficient degradation of carbamazepine by dual-wavelength UV enhanced E-peroxone process: Kinetics and mechanism

Published:7 December 2024 DOI: 10.1016/j.jclepro.2024.144394
Weichun Gao, Shengnan Chen, Cong Geng, Yinyan Guan, Yingjun Gao, Jiyan Liang

Abstract

Given the limitations of unequal H2O2 and O3 distribution in the E-peroxone (EP) process, a novel dual-wavelength UV enhanced E-peroxone process (VUV/UVC/EP) with high performance for removing emerging contaminants was established. In this paper, carbamazepine (CBZ) removal rates by different oxidation processes were investigated, calculating the kinetic effects of the VUV/UVC/EP processes in various operating parameters, and the degradation mechanisms and pathways of CBZ were comprehensively discussed. Compared with conventional EP, ultraviolet (UVC, wavelength 254 nm), UVC/EP, and dual-wavelength ultraviolet (VUV/UVC, wavelength 185 and 254 nm) processes, the VUV/UVC/EP process exhibits an excellent ability for degradation of carbamazepine (CBZ), the synergy coefficient between VUV/UVC and EP process is 1.44 (>1). In particular, the VUV/UVC/EP process exhibits exceptional degradation performance even at 50 mg L-1 CBZ. It also demonstrates high adaptability to varying pH, humic acid concentration, and different inorganic anions (SO42-, Cl-, NO3-, PO43- and CO32-). In addition, ·OH, 1O2, and·O2- were identified to exist in the VUV/UVC/EP process. The dominant reactive species ·OH content was increased by decomposing the excess dissolved O3 to accelerate CBZ degradation. CBZ was broken down into a series of intermediates, NO2-, NO3-, and other inorganic compounds through ring reduction and oxidation reactions under the attack of reactive oxygen species (ROS) generated in the VUV/UVC/EP process. It also can remove more than 50% of TOC in 30 min and decrease biological toxicity. An electrical energy-per-order (EEO) value of 3.37 kWh m-3 indicated that the VUV/UVC/EP process is economically feasible. This comprehensive examination provides valuable insights into the CBZ removal in reclaimed water, contributing to the advancement of environmental water resources.

Substances (5)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Sodium carbonate 497-19-8 CH2O3.2Na 1497 suppliers $14.00-$4640.00
Sodium chloride 7647-14-5 ClNa 1216 suppliers $5.00-$6678.62
Sodium hydroxide 1310-73-2 NaOH 1212 suppliers $14.00-$16472.00
Sodium sulfate 7757-82-6 Na2SO4 838 suppliers $6.00-$3655.00
Humic acid 1415-93-6 C9H9NO6 344 suppliers $44.40-$4880.00

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