Use of pilot-scale geomedia-amended biofiltration system for removal of polar trace organic and inorganic contaminants from stormwater runoff.
Use of pilot-scale geomedia-amended biofiltration system for removal of polar trace organic and inorganic contaminants from stormwater runoff.
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DOI：
10.1016/j.watres.2022.119246
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发表时间：
2022-10
期刊：
影响因子：
12.8
通讯作者：
M. Teixidó;Joseph A Charbonnet;Gregory H. LeFevre;R. Luthy;D. Sedlak
中科院分区：
文献类型：
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作者：
M. Teixidó;Joseph A Charbonnet;Gregory H. LeFevre;R. Luthy;D. Sedlak
雨水径流收集和地下水补给可以提供一种可持续的方式，在水资源紧张的城市增加当地的水资源，同时减轻洪水风险，只要这些过程不损害地下水质量。我们开发并测试了一年的创新中试规模的雨水处理列车，采用具有成本效益的工程geodia在连续流单元处理系统，以消除污染物从城市径流含水层补给。该系统包括一个铁增强砂过滤器的磷酸盐去除，一个木屑生物反应器的硝酸盐去除耦合到曝气步骤，和柱填充不同配置的生物炭和锰氧化物的沙子，以去除痕量金属和持久性，移动的，有毒的痕量有机污染物。在长时间（8个月）的真实雨水径流调节过程中，木片生物反应器去除了98%的进水硝酸盐（9 g-N m−3d−1），而磷酸盐迅速突破了铁强化砂滤器。在挑战测试（4个月）期间，geodia去除了超过80%质量的金属和微量有机化合物。在整个研究过程中，柱水力性能稳定，风化生物炭和氧化锰分别有效去除痕量有机污染物和金属。在现场可能遇到的条件下，持续的营养去除是可能的，但极性有机化合物，如2，4-D可能在研究地点的条件下大约十年后突破。
Stormwater runoff capture and groundwater recharge can provide a sustainable means of augmenting the local water resources in water-stressed cities while simultaneously mitigating flood risk, provided that these processes do not compromise groundwater quality. We developed and tested for one year an innovative pilot-scale stormwater treatment train that employs cost-effective engineered geomedia in a continuous-flow unit-process system to remove contaminants from urban runoff during aquifer recharge. The system consisted of an iron-enhanced sand filter for phosphate removal, a woodchip bioreactor for nitrate removal coupled to an aeration step, and columns packed with different configurations of biochar- and manganese oxide-containing sand to remove trace metals and persistent, mobile, and toxic trace organic contaminants. During conditioning with authentic stormwater runoff over an extended period (8 months), the woodchip bioreactor removed 98% of the influent nitrate (9 g-N m−3d−1), while phosphate quickly broke through the iron-enhanced sand filter. During the challenge test (4 months), geomedia removed more than 80% of the mass of metals and trace organic compounds. Column hydraulic performance was stable during the entire study, and the weathered biochar and manganese oxide were effective at removing trace organic contaminants and metals, respectively. Under conditions likely encountered in the field, sustained nutrient removal is probable, but polar organic compounds such as 2,4-D could breakthrough after about a decade for conditions at the study site.