Phosphorus is one of the important factors causing eutrophication pollution (Kong et al. 2005; Nguyen et al. 2011). The high concentration of residual phosphorus in wastewater results in the eutrophication of water environments (Cheng et al. 2014). Studies revealed that eutrophication might occur when the total phosphorus amount achieves 200~500 mg/m2/year in the water (StrokalRead more »