Chromium Fate in Constructed Wetlands Treating Tannery Wastewaters
Authors: Dotro, Gabriela; Palazolo, Paul; Larsen, Daniel
Source: Proceedings of the Water Environment Federation, WEFTEC 2008: Session 61 through Session 70 , pp. 4770-4789(20)
Publisher: Water Environment Federation
Abstract:Nine experimental wetlands were built to determine chromium partitioning inside systems treating tannery wastewaters. Results showed BOD5 and chromium removals of 95-99% and 90-99%, respectively. The majority of chromium was found in association with media (96-98%), followed by effluents (2.9-3.9%), and the least was found in plant parts (0.1%). Chemical speciation modeling of solutions and scanning electron microscope analysis suggest two potential chromium removal mechanisms: sorption/ co-precipitation with iron oxides and biomass sorption. The release of the majority of chromium in the iron- and organic-bound phases during sequential extractions supports the proposed dominant removal mechanisms. The use of a mixture of peat and gravel resulted in lower removal efficiencies and stronger partitioning in organic phases during sequential extractions. Chromium was efficiently removed by wetlands, retained through chemical and biological processes. Future research will focus on further exploring removal mechanisms and proposing management strategies for the chromiumcontaining wetland media.
Document Type: Research article
Publication date: 2008-01-01
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