Performance of combined sodium persulfate/H^sub 2^O^sub 2^ based advanced oxidation process in stabilized landfill leachate treatment

• Published in: Journal of environmental management Vol. 166; p. 493
• Main Authors: Hilles, Ahmed H, Abu Amr, Salem S, Hussein, Rim A, El-Sebaie, Olfat D, Arafa, Anwaar I
• Format: Journal Article
• Language: English
• Published: London Academic Press Ltd 15.01.2016
• Subjects: Hydrogen peroxide; Landfill; Leachates; Oxidation; Water treatment
• ISSN: 0301-4797; 1095-8630

A combination of persulfate and hydrogen peroxide (S...O.../H...O...) was used to oxidize landfill leachate. The reaction was performed under varying S...O.../H...O... ratio (g/g), S...O.../H...O... dosages (g/g), pH, and reaction time (minutes), so as to determine the optimum operational conditions. Results indicated that under optimum operational conditions (i.e. 120 min of oxidation using a S...O.../H...O... ratio of 1 g/1.47 g at a persulfate and hydrogen peroxide dosage of 5.88 g/50 ml and 8.63 g/50 ml respectively, at pH 11) removal of 81% COD and 83% NH...-N was achieved. In addition, the biodegradability (BOD.../COD ratio) of the leachate was improved from 0.09 to 0.17. The results obtained from the combined use of (S...O.../H...O...) were compared with those obtained with sodium persulfate only, hydrogen peroxide only and sodium persulfate followed by hydrogen peroxide. The combined method (S...O.../H...O...) achieved higher removal efficiencies for COD and NH...-N compared with the other methods using a single oxidizing agent. Additionally, the study has proved that the combination of S...O.../H...O... is more efficient than the sequential use of sodium persulfate followed by hydrogen peroxide in advanced oxidation processes aiming at treating stabilized landfill leachate. (ProQuest: ... denotes formulae/symbols omitted.) [web URL: http://www.sciencedirect.com/science/article/pii/S0301479715303492]