“…This floating macrophyte covers the surface water and becomes a threat for native aquatic organisms as an "invasive species" in Japan. On the other hand, water lettuce has been known to effectively remove pollutants such as nutrients (Ayyasamy et al, 2009;Lu et al, 2010;Akinbile and Yusoff, 2012;Rawat et al, 2012;Xiao et al, 2013), metals (Mishra and Tripathi, 2008;Mufarrege et al, 2010;Lu et al, 2011;Vesely et al, 2011Vesely et al, , 2012 and pesticides (Prasertsup and Ariyakanon, 2011). The phytoremediation potential of these plants were evaluated in the laboratory scale (Zimmels et al, 2008), in the pilot-plant scale (Polomski et al, 2009) or field scale (Nahlik and Mitsch, 2006).…”