In order to treat piggery wastewater with high ammonium density and low C/N ratio, a wood-chip-framework soil infiltrator (WFSI) was constructed and its performance in COD, NH4+-N and TN removal was investigated, while the mechanism for denitrification was analyzed. The infiltrator was started up at a hydraulic surface loading rate of 0.2 m3/m2·d and temperature (25±1)℃, and could get steady in performance within 30 days. The results showed that COD, NH4+-N and TN removal in the infiltrator were about 61.7%, 85.0% and 36.3%, respectively, as against a feed concentration which ranged 160~359, 253~298 and 317~374 mg/L, respectively. Heterotrophic denitrification and ANAMMOX were identified as the denitrification approaches in the WFSI, and the contribution of ANAMMOX to the TN removal was more than 42.3%. The COD, NH4+-N and TN removal in the infiltrator were about 61.7%, 85.0% and 36.3%, respectively, as against a ranged feed concentration of 160~359, 253~298 and 317~374mg/L, respectively.
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