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The treatment effect of biogas slurry using ecological filters and the artificial wetland combination stabilization pond system under different hydraulic loading were researched. The analysis was carried out on the hydraulic load effect on the performance of the combined system, and the contribution rate of each process structure. Results showed that the combined system's load resistant capability is strong enough to provide good treatment effect, stable water and the removal efficiency with the increase of hydraulic load. Optimal removal effect under low hydraulic load was gained. Negative correlation existed between treatment effect of the artificial wetland and hydraulic load. Ecological filter on COD removal effect is better but the nitrogen and phosphorus removal efficiency of pollutants of artificial wetland is better than that of the ecological filter. Keywords-hydraulic loading; ecological filter-artificial wetland; removal efficiency

Removal Efficiency of Treat Biogas Slurry Using Ecological Filter-Artificial Wetland Combined System under Different Hydraulic Loading