水平渗滤系统的污染物去除效果及动力学分析

基于人工快渗(CRIS)和水平潜流人工湿地(HSSFCWs)构建了水平流人工渗滤系统(HFCIS)，研究了该系统对耗氧有机物(以COD计)、氨氮(NH₄⁺-N)的沿程去除情况和污染物在系统内的垂向分布情况，并进行了动力学分析。结果表明，在水力负荷为0.083 m·d⁻¹、进水耗氧有机物(以COD计)浓度为220~630 mg·L⁻¹、NH₄⁺-N质量浓度为13~47 mg·L⁻¹时，COD、NH₄⁺-N的去除率分别为88.6%和91.9%以上。在水力负荷为0.25 m·d⁻¹的条件下，进水耗氧有机物(以COD计)和NH₄⁺-N质量浓度分别为613~690 mg·L⁻¹和36~48 mg·L⁻¹时，总去除率分别为95.5%和78.2%以上。水平方向沿程污染物质量浓度呈现逐渐衰减的趋势，污染物降解符合一阶动力学模型，去除速率常数在CRIS和HSSFCWs的速率常数范围内并处于较高水平。该HFCI系统填料简单，复氧效果好，污染物去除性能优异，提高了土地利用率，建造位置选择较为灵活，在分散式污水处理中有独特的优势。

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.