NOVELTY - Improvement of removal efficiency of nitrogen (N), phosphorus (P), and chemical oxygen demand (COD) in biogas slurry is performed by building ecological floating bed using water hyacinth and Canna, standing stable plant, placing 40 L biogas slurry in liquid storage tank, controlling flow meter so that biogas slurry moves into water dropping device, flowing into ecological floating bed for plant treatment, carrying out microorganism treatment, and sampling and analyzing COD using potassium dichromate and total N using alkaline potassium peroxydisulfate digestion UV spectrophotometry.    USE - Improvement of removal efficiency of nitrogen, phosphorus, and chemical oxygen demand in biogas slurry (claimed).    ADVANTAGE - Process is simple, convenient, environment-friendly, low cost, and energy-saving, improves processing effect of biogas slurry, reduces sewage aeration device investment, effectively utilizes mountain area, and does not to occupy land in order to use ecological floating bed.    DETAILED DESCRIPTION - Improvement of removal efficiency of N, P, and COD in biogas slurry is performed by building ecological floating bed using water hyacinth and Canna, standing stable plant, placing 40 L biogas slurry in liquid storage tank, controlling flow meter so that biogas slurry moves into water dropping device, flowing into ecological floating bed for plant treatment, carrying out microorganism treatment, sampling and analyzing COD using potassium dichromate, total N using alkaline potassium peroxydisulfate digestion UV spectrophotometry, and total P using ammonium molybdate spectrophotometry at water outlet, and detecting total N in water, total P, and organic matter concentration. An INDEPENDENT CLAIM is included for ecological floating bed device.    DESCRIPTION OF DRAWING(S) - The drawing shows a process flow chart of improving removal efficiency of nitrogen, phosphorus, and chemical oxygen demand in biogas slurry. (Drawing includes non-English language text).