An Innovative Wood-chip-framework Substrate used as Slow-release Carbon Source to Treat High-strength Nitrogen Wastewater
An Innovative Wood-chip-framework Substrate used as Slow-release Carbon Source to Treat High-strength Nitrogen Wastewater
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一种创新的木片框架基质作为缓释碳源处理高浓度氮废水
DOI：
10.1016/j.jes.2016.07.008
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发表时间：
2017
影响因子：
6.9
通讯作者：
Jianzheng Li
中科院分区：
文献类型：
--
作者：
Huai Li;Zifang Chi;Baixing Yan;Long Cheng;Jianzheng Li
在废水排放到受纳水道之前去除废水中的氮是处理系统中的重要考虑因素。然而，由于低的碳/氮（C/N）比，脱氮效率通常是有限的。一种常见的解决方案是添加外部碳源，但液体的量很难确定。为此，在折流式潜流人工湿地中构建木屑-骨架复合基质（木材、炉渣和砾石）作为缓释碳源，以解决这一问题。结果表明，复合基质对氨氮（NH 4 +-N）、总氮（TN）和化学需氧量（COD）的去除率分别可达37.5%~ 85%、57.4%~ 86%、32.4%~ 78%，说明复合基质能为硝化过程（渣石区）扩散充足的氧气，为反硝化过程（木屑区）提供碳源。根据炉渣/砾石和木屑的位置分别测定硝化和反硝化作用。在冲击负荷前，炉渣-木屑-砾石复合基质由于硝化-反硝化作用，在稳定阶段脱氮效果较好;而在冲击负荷下，木屑-炉渣-砾石复合基质由于厌氧氨氧化作用，在稳定阶段脱氮效果较好。该研究为湿地处理高浓度含氮废水提供了新的思路。
Removal of nitrogen in wastewater before discharge into receiving water courses is an important consideration in treatment systems. However, nitrogen removal efficiency is usually limited due to the low carbon/nitrogen (C/N) ratio. A common solution is to add external carbon sources, but amount of liquid is difficult to determine. Therefore, a combined wood-chip-framework substrate (with wood, slag and gravel) as a slow-release carbon source was constructed in baffled subsurface-flow constructed wetlands to overcome the problem. Results show that the removal rate of ammonia nitrogen (NH4+-N), total nitrogen (TN) and chemical oxygen demand (COD) could reach 37.5%–85%, 57.4%–86%, 32.4%–78%, respectively, indicating the combined substrate could diffuse sufficient oxygen for the nitrification process (slag and gravel zone) and provide carbon source for denitrification process (wood-chip zone). The nitrification and denitrification were determined according to the location of slag/gravel and wood-chip, respectively. Nitrogen removal was efficient at the steady phase before a shock loading using slag-wood-gravel combined substrate because of nitrification–denitrification process, while nitrogen removal was efficient under a shock loading with wood-slag-gravel combined substrate because of ANAMMOX process. This study provides a new idea for wetland treatment of high-strength nitrogen wastewater.