Environmental Geochemistry and Health

, Volume 39, Issue 6, pp 1397–1407 | Cite as

Biochar-based constructed wetlands to treat reverse osmosis rejected concentrates in chronic kidney disease endemic areas in Sri Lanka

  • B. C. L. Athapattu
  • T. W. L. R. Thalgaspitiya
  • U. L. S. Yasaratne
  • Meththika Vithanage
Original Paper

Abstract

The objectives were to investigate the potential remedial measures for reverse osmosis (RO) rejected water through constructed wetlands (CWs) with low-cost materials in the media established in chronic kidney disease of unknown etiology (CKDu) prevalent area in Sri Lanka. A pilot-scale surface and subsurface water CWs were established at the Medawachchiya community-based RO water supply unit. Locally available soil, calicut tile and biochar were used in proportions of 81, 16.5 and 2.5% (w/w), respectively, as filter materials in the subsurface. Vetiver grass and Scirpus grossus were selected for subsurface wetland while water lettuce and water hyacinth were chosen for free water surface CWs. Results showed that the CKDu sensitive parameters; total dissolved solids, hardness, total alkalinity and fluoride were reduced considerably (20–85%) and most met desirable levels of stipulated ambient standards. Biochar seemed to play a major role in removing fluoride from the system which may be due to the existing and adsorbed K+, Ca+2, Mg+2, etc. on the biochar surface via chemisorption. The least reduction was observed for alkalinity. This study indicated potential purification of aforesaid ions in water which are considerably present in RO rejection. Therefore, the invented bio-geo constructed wetland can be considered as a sustainable, economical and effective option for reducing high concentrations of CKDu sensitive parameters in RO rejected water before discharging into the inland waters.

Keywords

Reverse osmosis CKDu Fluoride Phytoremediation Constructed wetlands Biochar 

Notes

Acknowledgements

The authors are grateful to the support given by Mr. Asela Bandara Karunashinghe, Mr. H.A. Jayasiri, Mr. S.C. Rathnayake at the National Water Supply and Drainage Board and the community-based organization at Sangilikanadarawa, Medawachchiya, Sri Lanka.

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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  • B. C. L. Athapattu
    • 1
  • T. W. L. R. Thalgaspitiya
    • 2
  • U. L. S. Yasaratne
    • 3
  • Meththika Vithanage
    • 4
    • 5
    • 6
  1. 1.Department of Civil EngineeringThe Open University of Sri LankaNugegodaSri Lanka
  2. 2.National Water Supply and Drainage BoardRatmalanaSri Lanka
  3. 3.National Water Supply and Drainage BoardAnuradhapuraSri Lanka
  4. 4.Environmental Chemodynamics ProjectNational Institute of Fundamental StudiesKandySri Lanka
  5. 5.School of Civil Engineering and Surveying, Faculty of Health, Engineering and SciencesUniversity of Southern QueenslandToowoombaAustralia
  6. 6.International Centre for Applied Climate ScienceUniversity of Southern QueenslandToowoombaAustralia

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