期刊
ENVIRONMENTAL TECHNOLOGY
卷 35, 期 13, 页码 1639-1649出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2013.877984
关键词
phosphorus removal; natural zeolite; artificial aeration; constructed wetland; sewage treatment
资金
- CONICYT (Chile) [AT-24100052]
- Corfo Innova BioBio (Chile) [10CHS2 680F11]
- Red Doctoral REDOC.CTA at University of Concepcion [UCO1202]
- [CONICYT/FONDAP/15130015]
Phosphorus (P) contained in sewage maybe removed by mesocosm-scale constructed wetlands (MCW), although removal efficiency is only between 20% and 60%. P removal can be enhanced by increasing wetland adsorption capacity using special media, like natural zeolite, operating under aerobic conditions (oxidation-reduction potential (ORP) above+300mV). The objective of this study was to evaluate P removal in sewage treated by MCW with artificial aeration and natural zeolite as support medium for the plants. The study compared two parallel lines of MCW: gravel and zeolite. Each line consisted in two MCW in series, where the first MCW of each line has artificial aeration. Additionally, four aeration strategies were evaluated. During the operation, the following parameters were measured in each MCW: pH, temperature, dissolved oxygen and ORP. Phosphate () and chemical oxygen demand (COD), five-day biological oxygen demand (BOD5), total suspended solids (TSS) and ammonium. (NH (+)(4)-N ) were evaluated in influents and effluents. Plant growth (biomass) and proximate analysis for P content into Schoenoplectus californicus were also performed. The results showed that removal efficiency was 70% in the zeolite medium, presenting significant differences (p<.05) with the results obtained by the gravel medium. Additionally, aeration was found to have a significant effect (p<.05) only in the gravel medium with an increase in up to 30% for removal. Thus, S. californicus contributed to 10-20% of P removal efficiency.
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