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Treatment of Brackish Water by Three Macrophytes in Constructed Wetlands

Journal: International Research Journal of Advanced Engineering and Science (IRJAES) (Vol.3, No. 1)

Publication Date:

Authors : ;

Page : 191-197

Keywords : Brackish water; Constructed wetland; Electrical conductivity; Retention period; Non- tolerant plants; Removal efficiency.;

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Abstract

Series of investigations was conducted to evaluate the feasibility of using constructed wetland to remove pollutants from saline wastewater. Three emergent plants; Pistia stratiotes, Typha orientalis and Eichhornia crassipes were planted in an experimental plot and fed with saline water diluted with distilled water to simulate a brackish water concentration of 8.7 µS/cm. A pilot-scale free water surface-flow constructed wetland was set up to demonstrate the performance of sand- based constructed wetland, and removal efficiency for the selected emergent plants in treating brackish water, from diluted saline water. Treatment performances of planted units were found to be 54.5– 66% for electrical conductivity, 72.4–89.4% for Chloride, 33.3–75% for Total Hardness and 66.2–95.4% for Coliform counts. The most satisfactory plant with salt removal efficiency was Pistia stratiotes though the plant growth was limited by salt concentrations. The wetland plants were non-resistant to brackish water under the tested conditions during the 20-day retention period, with notable percentage increase in concentrations of some parameters. Salt enriched wastewater inhibited nutrients flourishing, thus reduced treatment performance. Final effluent was non-potable for human consumption, suitable for irrigation and livestock watering. Treatment system was economical and environmentally friendly, free from offensive odour and insect invasion.

Last modified: 2018-04-16 21:17:43