Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 281, Issue -, Pages 106-113Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2014.06.046
Keywords
Chromium; HRT; HSF constructed wetlands; Common reeds; Composting
Categories
Funding
- European Union (European Social Fund - ESF)
- Greek national funds through the Operational Program Education and Lifelong Learning of the National Strategic Reference Framework (NSRF) - Research Funding Program: THALIS
- Hellenic State Scholarships Foundation
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The present work was conducted to study integrated chromium removal from aqueous solutions in horizontal subsurface (HSF) constructed wetlands. Two pilot-scale HSF constructed wetlands (CWs) units were built and operated. One unit was planted with common reeds (Phragmites australis) and one was kept unplanted. Influent concentrations of Cr(VI) ranged from 0.5 to 10 mg/L. The effect of temperature and hydraulic residence time (8-0.5 days) on Cr(VI) removal were studied. Temperature was proved to affect Cr(VI) removal in both units. In the planted unit maximum Cr(VI) removal efficiencies of 100% were recorded at HRT's of 1 day with Cr(VI) concentrations of 5, 2.5 and 1 mg/L, while a significantly lower removal rate was recorded in the unplanted unit. Harvested reed biomass from the CWs was co-composted with olive mill wastes. The final product had excellent physicochemical characteristics (C/N: 14.1-14.7, germination index (GI): 145-157%, Cr: 8-10 mg/kg dry mass), fulfills EU requirements and can be used as a fertilizer in organic farming. (C) 2014 Elsevier B.V. All rights reserved.
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