Analysis of performance and kinetics of pollutant removal by a horizontal flow infiltration system
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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