Journal
ENVIRONMENTAL TECHNOLOGY
Volume 37, Issue 14, Pages 1811-1820Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2015.1133715
Keywords
Aeration; ammonium removal; constructed wetland; natural zeolite; sewage treatment
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Funding
- CORFO INNOVA BioBio (Chile) [10CHS2 680F11, 13.3327-IN.IIP]
- CONICYT (Chile) [AT-24100052, CONICYT/FONDAP/15130015]
- Red Doctoral REDOC.CTA MINEDUC [UCO1202]
- CONICYT (Chile) Latin American Scholarship Program [D-57080066]
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The objective was to evaluate the effects of intermittent artificial aeration cycles and natural zeolite as a support medium, in addition to the contribution of plants (Schoenoplectus californicus) on NH4+-N removal during sewage treatment by Constructed Wetlands (CW). Two lines of Mesocosm Constructed Wetland (MCW) were installed: (a) gravel line (i.e. G-Line) and (b) zeolite line (i.e. Z-Line). Aeration increased the NH4+-N removal efficiency by 20-45% in the G-Line. Natural zeolite increased the NH4+-N removal efficiency by up to 60% in the Z-Line. Plants contributed 15-30% of the NH4+-N removal efficiency and no difference between the G-Line and the Z-Line. Conversely, the NH4+-N removal rate was shown to only increase with the use of natural zeolite. However, the MCW with natural zeolite, the NH4+-N removal rate showed a direct relationship only with the NH4+-N influent concentration. Additionally, relationship between the oxygen, energy and area regarding the NH4+-N removal efficiency was established for 2.5-12.5 gO(2)/(kWh-m(2)) in the G-Line and 0.1-2.6 gO(2)/(kWh-m(2)) in the Z-Line. Finally, it was established that a combination of natural zeolite as a support medium and the aeration strategy in a single CW could regenerate the zeolite's adsorption sites and maintain a given NH4+-N removal efficiency over time.
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