摘要：To reduce the loading of nutrient compounds (N, P) to eutrophic waters, three floating beds (FBs) were built to treat a simulated wastewater. Two hybrid FBs (HFBs) were created using either rice straw (HFB-R) or palygorskite ceramsite (HFB-C) as a substrate for microorganisms and macrophytes. The third FB consisted of the control (C-FB) without a substrate. Under batch conditions after 3 d, the total nitrogen (TN) concentration in raw water was reduced from 8.82 ± 1.08 mg/L to a final average concentration of 6.66 ± 0.75, 5.87 ± 0.79 and 0.85±0.35 mg/L using the C-FB, HFB-C and HFB-R, respectively. The macrophyte enzymes and growth rate followed the order HFB-R > FB > HFB-C. The organic substrate (rice straw) used in the FBs enhanced bio-remediation efficiency and macrophyte growth, but the inert palygorskite ceramsite hindered the bio-remediation process.
