Abstract
In this study, phytoremediation performance of Lemna minor L. on boron removal from synthetic solution and real geothermal water was evaluated. Effects of initial boron concentration, initial pH, water height in cell, and initial humic acid concentration were investigated. The maximum removal efficiency was achieved as 96.7 % with the experimental run with 5 mg L-1 initial boron concentration, pH 8, and 1.5 cm water depth. Increasing the initial boron concentration from 5 to 30 mg L-1 resulted in a drastic decrease in removal efficiency to 36.6 %, due to the toxic effect of high boron content, which was clearly observed from deterioration of plant’s color and structure. SEM, FTIR, and mass balance analyses revealed that the boron removal mechanism was mainly biosorption. Geothermal water experiments indicated L. minor’s applicability with 59.5% removal efficiency, proving high potential in being used for post-treatment of geothermal waters with high boron content.
Highlights
Water scarcity problem, which from a strict economical perspective explains in higher cost for clean water and wastewater treatment, poses a significant problem for developing and developed countries alike
The pH of the aqueous solutions have a significant impact on removal of boron in aqueous solutions and treatment performance of L. minor [17, 25]
This study aims at investigating the phytoremediation of boron rich waters using L. minor, a common duckweed
Summary
Water scarcity problem, which from a strict economical perspective explains in higher cost for clean water and wastewater treatment, poses a significant problem for developing and developed countries alike. World Health Organization (WHO) reported that 748 million people lack access to clean and adequate water resources, while at least 2 billion people use water sources that are contaminated. While roughly 50.0% of the World’s inhabitants facing with water scarcity, one third of it have limited excess to energy services [1, 2]. Availability and accessibility to safe and secure water resources are the key technological and scientific problems of global significance. Utilization of geothermal waters for various domestic purposes dates back to ancient times as evidence shows Native Americans using it for cooking approximately 10,000 years ago. Realization of geothermal resources’ economic potential has
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