【摘要】 在生物滞留设施内构建淹没区并添加碳源是目前广泛采用的雨水强化脱氮方式，这使得淹没区成为反硝化作用发生的主要场所，并显著影响生物滞留设施脱氮效能。但是目前尚无研究清晰揭示生物滞留设施中碳源的种类和位置对淹没区水质的影响。基于提升黄铁矿同步脱氮除磷的能力，在黄铁矿基质生物滞留设施中通过改变碳源的种类（玉米芯、稻壳、树皮）和添加位置探究了其对淹没区水质的影响。结果显示，3种碳源对强化NO^-₃-N的去除的能力顺序为树皮>稻壳>玉米芯，且树皮不会造成NH⁺₄-N去除效率的下降。对淹没区水质的进一步研究发现，添加树皮后淹没区NH⁺₄-N、PO₄^3--P浓度更低，且NO^-₃-N去除速率更快。碳源添加在覆盖层促进了NH⁺₄-N和PO₄^3--P去除，但NO^-₃-N去除率略微下降。碳源添加在覆盖层可以维持淹没区中更低且稳定的NH⁺₄-N浓度，并提供适宜的COD使NO^-₃-N浓度不断下降。当碳源添加在包气带和覆盖层时反硝化主要发生在干旱期间，而碳源添加在淹没区时反硝化作用主要发生在降雨期间。更多还原

【Abstract】 The establishment of submerged zones and the addition of carbon sources in bioretention facilities is a common method for enhancing nitrogen removal at present, which makes the submerged zone the main site for denitrification and an important factor affecting the efficiency of bioretention facilities. However, few researchers have studied the effects of the types and locations of carbon sources in bioretention facilities on water quality of submerged zones. Based on the ability of simultaneous nitrogen and phosphorus removal of pyrite, the effect of carbon source on water quality in the submerged zone was studied by changing the type of carbon sources（corncob, rice husk, woodchips） and dosing locations of carbon source corncob in pyrite-based bioretention facility. The results showed that NO^-₃-N removal rate of the three carbon sources was in the order of woodchips > rice husk > corn cob, and the woodchips did not cause a decrease in removal efficiency of NH⁺₄-N. Further study on the water quality of the submerged zone showed that NH⁺₄-N and PO₄^3--P were lower in the submerged zone after the addition of woodchips, and the removal efficiency of NO^-₃-N was higher. The carbon source added to the mulching layer led to a better NH⁺₄-N and PO₄^3--P removal performance, but a slightly lower removal performance of NO^-₃-N. In the submerged zone, the addition of carbon sources in the mulching layer helped maintain a lower and stable NH⁺₄-N concentration and provided appropriate COD to continuously reduce NO^-₃-N. More importantly, when the carbon source was added in the vadose zone and mulching layer, the denitrification mainly occurred during drought, while when the carbon source was added in the submerged zone, the denitrification mainly occurred during rainfall.更多还原