Ultraviolet-enhanced Fe0-activated H2O2 process for the removal of refractory organic matter from landfill leachate: Performance and mechanism

被引:1
|
作者
Zhao, Guonan [1 ]
Feng, Ke [1 ]
机构
[1] SouthWest Jiaotong Univ, Sch Environm Sci & Engn, Chengdu 611756, Sichuan, Peoples R China
关键词
Fenton-like oxidation; landfill leachate; refractory organic matter; UV; zero-valent iron; ZERO-VALENT IRON; WASTE-WATER; FENTON-LIKE; DEGRADATION; ACID; EXCITATION; OZONATION;
D O I
10.1002/wer.70022
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The Fenton-like process, utilizing zero-valent iron (Fe0) and hydrogen peroxide (H2O2), is employed to degrade refractory organic matter in membrane bioreactor (MBR) effluent derived from landfill leachate. However, the rate-limiting Fe2+/Fe3+ redox step diminishes treatment efficacy and generates substantial iron sludge. This study elucidates the mechanism by which ultraviolet (UV) irradiation augments the Fe0/H2O2 process for the removal of refractory organic matter in MBR effluent. The results show that the UV- enhanced H2O2 process effectively disrupts the aromatic structure of organic compounds, reducing molecular weight, degree of polymerization, and humification. Compared with the Fe0/H2O2 process, the removal efficiency of UV254, color number, and total organic carbon in the effluent treated by the UV/Fe0/H2O2 process increased by 24.16%, 14.62%, and 57.46%, respectively. Concurrently, the generation of iron sludge was reduced by 21.6%. This enhancement is primarily attributed to UV's ability to intensify the Fe2+/Fe3+ redox cycle and expedite the surface corrosion of Fe0, yielding more iron oxides. This accelerates the decomposition of H2O2, generating a higher quantity of center dot OH through both homogeneous and heterogeneous Fenton-like reactions. The refractory organic matter is removed through the oxidation by center dot OH, as well as the adsorption and precipitation facilitated by iron-based colloids.Practitioner Points UV promotes Fe0/H2O2 process to degrade refractory organic matter in MBR effluent. UV promotes Fe0 to dissolve more Fe2+ and the redox cycle of Fe2+ and Fe3+. The dosage of H2O2 or Fe0 influences the treatment effect of the process.
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页数:16
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