Effect of plantation pattern on the efficiency of subsurface flow constructed wetland (sfcw) for sewage treatment

The subsurface flow constructed wetland system (SFCW) with mono- and mixed-cultures ofTypha latifolia and Canna siamensis could be applied for sewage treatment. The system efficiency was decreased with the decrease of HRT, excepted for nitrate removal. Both types of cultivated-plant did not show any difference on SS, BOD5, ammonium-N2, nitrate-N2 and total phosphorus removal efficiencies. But, SFCW with mixed-cultures showed the highest phosphorus and nitrate removal efficiencies. Also, it gave the highest plant-biomass production yield. Phosphorus was highly accumulated in the plant tissue while, nitrogen was highly accumulated in the media. Number of bacteria of the system was not difference among plant species and plantation pattern, but it was decreased with the decreased of HRT. Then, the removal efficiencies of the system with both mono- and mixed-cultures were highest at the longest HRT operation of 6 days except for nitrate removal. The highest SS, BOD5, ammonia-N2 and total phosphorus removal efficiencies were about 91, 91, 86 and 87%, respectively were obtained in SFCW with both mono- and mixed-cultures.   Key words: Plantation pattern, hydraulic retention time (HRT), vertical-flow constructed wetland, Typha latifolia, Canna siamensis.

[1]  Hans Brix,et al.  Wastewater Treatment in Constructed Wetlands: System Design, Removal Processes, and Treatment Performance , 1993 .

[2]  S. K. Billore,et al.  POTENTIAL REMOVAL OF PARTICULATE MATTER AND NITROGEN THROUGH ROOTS OF WATER HYACINTH IN A TROPICAL NATURAL WETLAND , 1998 .

[3]  Keith A. Smith,et al.  Phosphate and ammonium removal by constructed wetlands with horizontal subsurface flow, using shale as a substrate , 1997 .

[4]  W. Armstrong,et al.  MEASUREMENT AND MODELLING OF OXYGEN RELEASE FROM ROOTS OF PHRAGMITES AUSTRALIS , 1990 .

[5]  L. H. S. Tavares.  Constructed wetland in wastewater treatment , 2008 .

[6]  Donald A. Hammer,et al.  Designing constructed wetlands systems to treat agricultural nonpoint source pollution , 1992 .

[7]  H. D. Stensel,et al.  Wastewater Engineering: Treatment and Reuse , 2002 .

[8]  Ina Ruck,et al.  USA , 1969, The Lancet.

[9]  F. W. Gilcreas,et al.  Standard methods for the examination of water and waste water. , 1966, American journal of public health and the nation's health.

[10]  A. E. Greenberg,et al.  Standard Methods for the Examination of Water and Wastewater seventh edition , 2013 .

[11]  M. Jackson,et al.  Plant adaptations to anaerobic stress , 1997 .

[12]  Jian Huang,et al.  Nitrogen removal in constructed wetlands employed to treat domestic wastewater. , 2000 .

[13]  Gerald A. Moshiri,et al.  Constructed Wetlands for Water Quality Improvement , 1993 .

[14]  J. K. Cronk,et al.  Constructed wetlands to treat wastewater from dairy and swine operations: a review , 1996 .