In:
Waste Management & Research: The Journal for a Sustainable Circular Economy, SAGE Publications, Vol. 30, No. 1 ( 2012-01), p. 12-19
Abstract:
Fenton oxidation typically achieves only a moderate removal efficiency of chemical oxidation demand (COD) in treatment of a landfill leachate, incomparable to some other chemical oxidation processes (e.g. electrochemical oxidation). A traditional viewpoint is that the remaining highly oxidized organic species become recalcitrant to hydroxyl radical (OH·)-induced oxidation at a higher degree of Fenton oxidation. Although this may, at least partially, be true, the effects of inorganic anions, which are abundant in leachate, on Fenton oxidation have been largely ignored. The objective of this study is to assess the roles of three inorganic anions (nitrate, sulfate, and chloride) originally present in or externally added to leachate during Fenton oxidation of refractory organic species in leachate. Nitrate [Formula: see text] did not significantly affect the COD removal rate. In contrast, sulfate [Formula: see text] and chloride [Formula: see text], particularly the latter, inhibited Fenton oxidation. Their inhibiting effect may be ascribed to: (1) scavenging of OH·; and (2) competition with H 2 O 2 to form Fe(III) complexes, thus preventing the Fe(II) regeneration from Fe(III) reduction. At 2.125H 2 O 2 :initial COD(COD 0 ) = 9.0, [H 2 O 2 ]:[Fe 2+ ] = 3, and pH = 3.0, 96, 62, 49, and 37% of COD 0 (1254 mg L −1 ) were removed in the presence of 0, 1270, 5000, and 10 000 mg L −1 [Formula: see text], respectively.
Type of Medium:
Online Resource
ISSN:
0734-242X
,
1096-3669
DOI:
10.1177/0734242X10378185
Language:
English
Publisher:
SAGE Publications
Publication Date:
2012
detail.hit.zdb_id:
1480483-9
detail.hit.zdb_id:
46937-3
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