Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
576402 | Journal of Hazardous Materials | 2015 | 8 Pages |
Abstract
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 10Â 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 1Â 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: 8-10Â mg/kg dry mass), fulfills EU requirements and can be used as a fertilizer in organic farming.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Health and Safety
Authors
Mar-Yam Sultana, Abu Khayer Md. Muktadirul Bari Chowdhury, Michail K. Michailides, Christos S. Akratos, Athanasia G. Tekerlekopoulou, Dimitrios V. Vayenas,