期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 182, 期 -, 页码 161-171出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2015.09.014
关键词
Sanitary landfill leachate; EAOPs; Wastewater treatment; Photoelectro-Fenton; Operational variables
资金
- AdvancedLFT project - FEDER [FCOMP-01-0202-FEDER-033960]
- FCT/MEC (Fundacao para a Ciencia e a Tecnologial/Ministerio da Educacao e Ciencia) [UID/EQU/50020/2013]
- FEDER [PT2020]
- QREN, ON2 program (Programa Operacional Regional do Norte) [NORTE-07-0124-FEDER-0000008]
- FEDER
- FCT [SFRH/BD/80361/2011, IF/01501/2013]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/80361/2011] Funding Source: FCT
The effect of various parameters on the performance of electrochemical advanced oxidation processes (EAOPs) like electro-Fenton (EF), photoelectro-Fenton (PEF) and solar PEF (SPEF) was assessed for the treatment of a sanitary landfill leachate previously subjected to biological and coagulation processes. The tested operational variables included: (i) anode material (boron-doped diamond (BDD) and Pt), (ii) initial total dissolved iron concentration (20-80 mg L-1), (iii) pH (2.8-4.0), (iv) initial addition of 1:3 Fe(III)-to-oxalate molar ratio at various pH values (2.8-5.0), (v) temperature (15-40 degrees C) and (vi) radiation source (UVA, UVA-Vis and UVC lamps and natural sunlight). The BDD anode showed high superiority over the Pt one for EF, PEF with UVA light (PEF-UVA) and SPEF processes, thereby advising an important role of the physisorbed hydroxyl radicals ((OH)-O-center dot) at the anode surface on landfill leachate oxidation even under the potent solar radiation. An initial total dissolved iron content of 60 mg L-1 was chosen as the best dose for the PEF-UVA process with the BDD anode (PEF-BDD-UVA). While PEF-BDD-UVA without external addition of oxalic acid yielded the best results at pH 2.8, the initial addition of 1:3 Fe(III)-to-oxalate molar ratio allowed operating at pH 3.5 with even higher efficiency and at pH 4.0 with only slightly lower efficiency. Effluent temperatures from 20 to 40 degrees C led to similar mineralization rates for the PEF-BDD-UVA technique. The use of UVA and UVC lamps and natural sunlight as radiation sources in PEF-BDD and SPEF-BDD systems led to similar mineralization profiles as a function of time. The UVA-Vis lamp induced lower effluent mineralization mainly for longer reaction times. (C) 2015 Elsevier B.V. All rights reserved.
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