Microbial characterization were identified uncultured Candidatus Accumulibacteria
phosphatis clade and Candidatus Nitrotoga sp. in sediment and root plant biofilm of full scale of
constructed wetland site at Laem Phak Bia (located at Phetchaburi Province, Thailand) but not full
scale of constructed wetland to treat only storm water at Fukuoka, Japan. This result potentially
suggests that constructed wetlands may be able to remove nitrogen under anaerobic conditions
without significant organic carbon source. In a pilot-scale constructed wetland, three wetlands
cells were inoculated with enriched suspended anammox cultures and fed synthetic wastewater
with 50, 70, and 90 mg N/L of both NH4
+-N and NO2
--N (1:1.32) at controlled retention time (3
and 5 days).
After 5 months days of operation, at different HRT (3 and 5 days) NH4
+-N removal efficiencies
ranged from 92.3% and 95.5%, respectively and NO2
--N removal efficiencies from 96.5% to 99.7%,
respectively. In the control, NH4
+-N average removal efficiencies were 82.5% and 82.4%, respectively
and NO2
--N average removal efficiencies were 70.4% and 72.6%, respectively. These results suggest
that anammox bacteria can grow and establish naturally in horizontal subsurface-flow constructed
wetlands and that such systems may be effective for the treatment of wastewater with low BOD
but high nitrogen for water reclamation.
Keywords
Anammox; constructed wetlands; Thailand
ENIVRONMENT ASIA
Published by : Thai Society of Higher Education Institutes on Environment Contributions welcome at : http://www.tshe.org/en/
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