학술논문
Combination of synchronized oxidation-adsorption with mesopore-rich powdered activated carbon in the deep removal of refractory COD from coking wastewater
Document Type
Article
Author
Sun, Guangxi ; Chi, Yongzhi ; Wang, Qi ; Huang, Xin ; Zhang, Yu ; Yu, Jianwei ; Tian, Zhe ; Yang, Min
Source
In Journal of Water Process Engineering November 2024 67
Subject
Language
ISSN
2214-7144
Abstract
Removal of refractory organics from the biological effluent of coking wastewater has been a challenge. In this study, synchronized oxidation-adsorption (SOA), which developed previously based on the Fenton reaction, was combined with powdered activated carbon (PAC) to remove the refractory chemical oxygen demand (COD) from a real bio-treated coking wastewater. Mesopore volume was found to be the most important factor affecting COD loading, and SOA (Fe2+ dose: 4 mM, H2O2 dose: 2 mM) + mesopore-rich PAC W1 (wood-based) could remove 57.2 %–79.3 % of COD with 100–1000 mg/L of PAC dosage, leading to the reduction of 90 % PAC addition comparing with PAC adsorption alone. Analysis revealed that SOA pretreatment could prevent pore blockage of PAC by removing the high molecular weight organics, including biopolymers and humics. The SOA + mesopore-rich PAC adsorption was applied in a full-scale coking wastewater treatment plant to stably decrease the COD from 222 ± 38 mg/L to 60 ± 10 mg/L over six months, and the treatment cost was reduced from over 3.1 US dollar/m3 to 1.1–1.2 US dollar/m3. This study demonstrated that SOA + mesopore-rich PAC is a promising approach for the deep removal of refractory COD from coking wastewater.