Therefore, a number of conventional

Therefore, a number of conventional approaches have been adopted for aquaculture wastewater treatment, such as Fenton’soxidation (Lee and Shoda, 2008), sequencing batch reactor (SBR)(Fontenot et al., 2007), up-flow anaerobic sludge bed (UASB)(Kaan et al., 2009), integrated anaerobic/aerobic biological treat-ment (Bortone, 2009). However, these approaches suffer of high cost, generation of toxic by-products and membrane fouling.Compared with traditional clean-up methods, phytore mediation,especially using aquatic plants, is now attracting much attention and considered promising because of its low cost, non-intrusive,environmental friendly and safety (Harrington and McInnes, 2009;Mook et al., 2012). Aquatic plants can utilize large amounts of nitrogen and phosphorus, and the above ground biomass could be harvested to remove these nutrients from wastewater ultimately.In addition, the harvested aquatic plants also could be used to generate valuable products, such as biogas, biofertilizer and bioma-terial (Singhal and Rai, 2003). At present, at least three approaches are being used to remove nitrogen and phosphorus through utiliza-tion of aquatic plants, which are macrophytes pond systems with free-floating plants, constructed wetlands with emergent plants and rhizofiltration system of floating bed (Li et al., 2007).