Removal of Pollutants through Vertical Multilevel Soil Infiltration System Combined Abiological and Biological Effect

摘要

Soil infiltration system was confirmed to be a low-energy consumption and low-cost treatment technique for wastewater treatment,but the removal of nitrogen was comparatively difficult.Vertical Multilevels Soil infiltration system (VMSI) was modified by combined stuffing (with active carbon,zeolite,sawdust and scrap iron) set for multilevel,and overcome the drawback of traditional soil infiltration system.VMSI exhibited effective pollutants removals because of its excellent effects of biological and abiological.Absorption column (both reactor and combined stuffing were disinfected with 75％ alcohol) was performed in parallel to investigating the proportion of abiological effects in pollutants removals.Results indicated that the average removal efficiency of chemical oxygen demand was up to 91.81％,97.03％ of total phosphorus,98.4％ of NH4+-N,and 84％ of total nitrogen.The abiological effects seemed to account for 53％-62％ against COD removal.Sawdust dosage could enhance the removal efficiency of NO3--N,nitrate and phosphate could be removed efficiently in VMSI.