TY - JOUR
T1 - Refractory COD removal from bio-treated paper wastewater using powdered activated coke adsorption technology with ozonation regeneration
T2 - Performance and molecular insights
AU - An, Ying
AU - Zhang, Huimin
AU - Fu, Li
AU - Tang, Chen
AU - Wang, Mengyu
AU - Xing, Yunxin
AU - Xu, Fuqiang
AU - Sun, Xiao
AU - Zhou, Zhen
N1 - Publisher Copyright:
© 2024 Elsevier Ltd
PY - 2024/9
Y1 - 2024/9
N2 - The present study employed powdered activated coke (PAC) for the adsorptive removal of refractory COD from the bio-treated paper wastewater (BTPW). The adsorption reached equilibrium after 3 h, resulting in a decrease in the COD concentration from 98.9 mg L−1 in BTPW to 42.6 mg L−1 when utilizing a PAC dosage of 5 g L−1. The dominant fractions of dissolved organic matter in BTPW were hydrophilic acids (HIA), hydrophilic neutrals (HIN), and hydrophobic acids (HOA), accounting for 48.8%, 34.2%, and 17.0% of the total dissolved organic carbon, respectively. Three fractions were all predominantly composed of humic/fulvic acid-like substances, while the HOA fraction exhibited highest susceptibility to adsorption by PAC, followed by the HIA and HIN fractions. FT-ICR MS data revealed PAC preferentially adsorbed the unsaturated and oxygen-rich substances containing more carboxyl groups. Additionally, the spent PAC was regenerated through ozonation and subsequently utilized in the adsorption cycles. The regeneration was successfully conducted under an ozone concentration of 1 mg L−1 for a duration of 10 min, and the regeneration efficiency remained about 87.0% even after undergoing five-cycle of adsorption-regeneration. The findings of this study demonstrate that PAC adsorption is a viable and efficacious treatment technology for efficiently removing refractory COD from BTPW.
AB - The present study employed powdered activated coke (PAC) for the adsorptive removal of refractory COD from the bio-treated paper wastewater (BTPW). The adsorption reached equilibrium after 3 h, resulting in a decrease in the COD concentration from 98.9 mg L−1 in BTPW to 42.6 mg L−1 when utilizing a PAC dosage of 5 g L−1. The dominant fractions of dissolved organic matter in BTPW were hydrophilic acids (HIA), hydrophilic neutrals (HIN), and hydrophobic acids (HOA), accounting for 48.8%, 34.2%, and 17.0% of the total dissolved organic carbon, respectively. Three fractions were all predominantly composed of humic/fulvic acid-like substances, while the HOA fraction exhibited highest susceptibility to adsorption by PAC, followed by the HIA and HIN fractions. FT-ICR MS data revealed PAC preferentially adsorbed the unsaturated and oxygen-rich substances containing more carboxyl groups. Additionally, the spent PAC was regenerated through ozonation and subsequently utilized in the adsorption cycles. The regeneration was successfully conducted under an ozone concentration of 1 mg L−1 for a duration of 10 min, and the regeneration efficiency remained about 87.0% even after undergoing five-cycle of adsorption-regeneration. The findings of this study demonstrate that PAC adsorption is a viable and efficacious treatment technology for efficiently removing refractory COD from BTPW.
KW - Adsorption
KW - Bio-treated paper wastewater
KW - Ozonation
KW - Powdered activated coke
KW - Regeneration
UR - https://www.scopus.com/pages/publications/85201696116
U2 - 10.1016/j.chemosphere.2024.143136
DO - 10.1016/j.chemosphere.2024.143136
M3 - 文章
C2 - 39168388
AN - SCOPUS:85201696116
SN - 0045-6535
VL - 364
JO - Chemosphere
JF - Chemosphere
M1 - 143136
ER -
