Agricultural Studies, Vol. 4, Issue 3, Jun  2020, Pages 10-26; DOI: https://doi.org/10.31058/j.as.2020.43002 https://doi.org/10.31058/j.as.2020.43002

Phytoremediation of Phosphates by Two Aquatic Macrophytes as a Remedy for Eutrophication

Agricultural Studies, Vol. 4, Issue 3, Jun  2020, Pages 10-26.

DOI: https://doi.org/10.31058/j.as.2020.43002

Lakshi Ayodya Dayarathne 1 , Mohammed Cassim Mohammed Iqbal 2 , Chaminda Egodawatta 1

1 Department of Plant Sciences, Faculty of Agriculture, Rajarata University of Sri Lanka, Anuradhapura, Sri Lanka

2 National Institute of Fundamental Studies, Hantana, Sri Lanka

Received: 20 January 2020; Accepted: 10 April 2020; Published: 22 June 2020

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Abstract

Eutrophication, a globally concerned water quality impairment as a result of excessive nutrient discharge, primarily by phosphates to water bodies from agricultural and other anthropogenic origins. Beyond a threshold of >0.03 mgL-1 of phosphates, usage of such eutrophied water bodies leads to severe health and environmental concerns to adjacent communities and ecosystems. Phytoremediation is a cost-effective plant-based approach, has been identified as sustainable and environmentally friendly remediation. The broad objective of the study was to assess the efficacy of aquatic macrophytes for phosphate phytoremediation. Eichhornia crassipes (Water hyacinth) and Pistia stratiotes L. (Water lettuce) were selected as candidate macrophytes. The efficacy of two selected macrophytes was tested in ambient atmospheric conditions in a greenhouse using floating sieves. Phytoremediation efficacy of different contact times, introductory weights, pH values, and initial phosphate concentrations were assessed. The phosphate sequestration ability of E. crassipes and P. stratiotes were estimated. A fresh weight of 250±5 g of two macrophytes was introduced into to a 3 L of 25 mgL-1 of phosphate solutions. The phosphate removal efficiencies were 71.6% and 76.8% from P. stratiotes, and E. crassipes respectively, after 48 hrs of equilibrium time. The most effective introduction biomass was 550 g for both P. stratiotes and E. crassipes with removal efficiencies of 77.1% and 80.1%, respectively. Maximum removal efficiencies of 77.7% and 83.7% were observed for P. stratiotes and E. crassipes at pH of 7. P. stratiotes reached to its maximum removal efficiency of 88.2% in 25 mgL-1, while in E. crassipes, the highest uptake was 47 mgL-1 at 250 mgL-1, despite the highest removal efficiency of 89.5% was at 25 mgL-1. P. stratiotes and E. crassipes showed a phosphorus sequestration potential of 35.4% and 41.6% from an eutrophied water body after five days, indicating a higher efficacy in phytoremediation and a candidacy of being a good source of phosphorus fertiliser in future.

Keywords

Eichhornia Crassipes, Pistia Stratiotes, Phosphates, Phytoremediation, Removal Efficiency, Sequestration

Copyright

© 2017 by the authors. Licensee International Technology and Science Press Limited. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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