In this study,a horizontal flow constructed infiltration system(HFCIS)was constructed based on the artificial rapid infiltration(CRIS)and the horizontal subsurface flow constructed wetland(HSSFCWs).The removal of oxygen consuming organic matter(COD)and ammonia nitrogen(NH4+-N)along HFCIS and the vertical distribution of pollutants in HFCIS were studied,as well as the kinetic analysis.The results showed that at the hydraulic load of 0.083 m·d-1,the influent oxygen consuming organic matter(COD)concentration of 220～630 mg·L-1,and the influent NH4+-N mass concentration of 13～47 mg·L-1,the removal rates of COD and NH4+-N were higher than 88.6％and 91.9％,respectively.When the hydraulic loading was 0.25 m·d-1,the mass concentrations of influent oxygen consuming organic matter(COD)and NH4+-N were 613-690 mg·L-1 and 36-48 mg·L-1,the total removal rates were over 95.5％and 78.2％,respectively.The pollutant mass concentration along the horizontal direction showed a gradually decreasing trend.The pollutant degradation accorded with the first-order kinetic model,and the removal rate constant was at a high level in the range of CRIS and HSSFCWs rate constants.HFCI system had a simple filling,a good reoxygenation effect,an excellent pollutant removal performance,improved the land utilization rate with a flexible construction location selection.It has unique advantages in decentralized sewage treatment.
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