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Assessing the potentials of Lemna minor in the treatment of domestic wastewater at pilot scale

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Abstract

Water crisis is one of the most serious problems faced by the world today. Phytoremediation is one of the serious efforts towards sustainability. Macrophyte-based wastewater treatment systems have several potential advantages compared with conventional treatment systems. Duckweeds (Lemna spp., Spirodela spp., Wolffia spp.) are small, green freshwater, free-floating aquatic plants. The primary objective of this work was to analyze the role of duckweeds in organic waste and nutrient removal from domestic wastewater being generated from hostels of Birla Institute of Technology, Mesra, Ranchi (India). Interesting results were obtained in which the BOD value reduced by 94.45% and the level of orthophosphate at the end of the work was found to be reduced by 79.39%. The duckweeds flourished well during the experimental period in the pH range of 7 to 8; it can be said that, other factors remaining favorable, the optimum pH for duckweed growth ranges from 7 to 8. Therefore, it can be concluded that this treatment can be successfully carried out on a large scale. Also, it is a low-cost solution to wastewater treatment problems and could satisfy the discharge standards.

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Correspondence to Kirti Avishek.

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Priya, A., Avishek, K. & Pathak, G. Assessing the potentials of Lemna minor in the treatment of domestic wastewater at pilot scale. Environ Monit Assess 184, 4301–4307 (2012). https://doi.org/10.1007/s10661-011-2265-6

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  • DOI: https://doi.org/10.1007/s10661-011-2265-6

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