Influence of the boron doping level on the electrochemical oxidation of raw landfill leachates: advanced pre-treatment prior to the biological nitrogen removal

S. Fudala-Książek , M. Sobaszek , A. Luczkiewicz , Aleksandra Pieczyńska , Aleksandra Ofiarska , Agnieszka Fiszka-Borzyszkowska , M. Sawczak , M. Ficek , Robert Bogdanowicz , Ewa Maria Siedlecka

Abstract

The electrochemical oxidative treatment of landfill leachates (LLs) containing high amounts of ammonia nitrogen and organic matter was used as a promising method, prior to biological processes, to achieve the final effluent quality that would be acceptable by current regulations. The deposited boron-doped diamond electrodes (BDDs) with different boron doping concentrations (10000, 5000 and 500 ppm of B) were applied as anodes. The results showed that the boron doping level influences the electrochemical activity and selectivity of electrode surface due to a decrease in the sp3/sp2 ratio of the BDD material. Special attention was paid to the oxidation efficiency of organic matter (COD = 4225 mg O2/L, BOD = 366 mg O2/L) and ammonia (2270 mg N-NH4+/dm3) in the investigated LLs. Additionally, bisphenol A (BPA; 1539.6 μg/L), a suspected endocrine disruptor, was studied as a potential indicator of the removal efficiency of micropollutants.It was found that the oxidation of BPA and BOD are correlated with the sp3/sp2 ratio, while a decrease in the sp3/sp2 ratio of the BDD material was associated with the elevated efficiency of N-NH4+ removal. Low pH and the addition of Fe(II) salts suppressed the oxygen evolution reaction, and overcame the mass transport limitation of organics in the case of •OH-mediated oxidation.Regarding the elimination of ammonium nitrogen, lower effectiveness was generally achieved in comparison to the COD removal. The maximum removal of COD and ammonium nitrogen reached 79 and 41%, respectively. These values were much higher than those reported in the previous study involving a single-cell flow reactor. Thus, anaerobic ammonium oxidation (Anammox) processes seem to be a reasonable option as a final step of LL treatment.
Author S. Fudala-Książek
S. Fudala-Książek,,
-
, M. Sobaszek
M. Sobaszek,,
-
, A. Luczkiewicz
A. Luczkiewicz,,
-
, Aleksandra Pieczyńska PPZU
Aleksandra Pieczyńska,,
- Laboratory of Advanced Oxidation Processes
, Aleksandra Ofiarska PPZU
Aleksandra Ofiarska,,
- Laboratory of Advanced Oxidation Processes
, Agnieszka Fiszka-Borzyszkowska PPZU
Agnieszka Fiszka-Borzyszkowska,,
- Laboratory of Advanced Oxidation Processes
, M. Sawczak
M. Sawczak,,
-
, M. Ficek
M. Ficek,,
-
, Robert Bogdanowicz
Robert Bogdanowicz,,
-
, Ewa Maria Siedlecka PPZU
Ewa Maria Siedlecka,,
- Laboratory of Advanced Oxidation Processes
Journal seriesChemical Engineering Journal, ISSN 1385-8947
Issue year2018
Vol334
Pages1074-1084
Publication size in sheets1.75
Keywords in Englishboron-doped diamonds, landfill leachates, advanced oxidation process, micropollutant removal, pre-treatment step
DOIDOI:10.1016/j.cej.2017.09.196
Languageen angielski
Score (nominal)45
ScoreMinisterial score = 45.0, 20-12-2017, ArticleFromJournal
Ministerial score (2013-2016) = 45.0, 20-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 6.216 (2) - 2016=6.159 (5)
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