Biochar and activated carbon for enhanced trace organic contaminant retention in stormwater infiltration systems.
Biochar and activated carbon for enhanced trace organic contaminant retention in stormwater infiltration systems.
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DOI：
10.1021/acs.est.5b00376
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发表时间：
2015-05
影响因子：
11.4
通讯作者：
Bridget A. Ulrich;Eugenia Im;D. Werner;C. Higgins
中科院分区：
文献类型：
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作者：
Bridget A. Ulrich;Eugenia Im;D. Werner;C. Higgins
为了评估生物炭和活性炭 (AC) 在雨水渗透系统中增强痕量有机污染物 (TOrC) 保留的有效性，采用了一种结合前向预测模型和实验室验证实验的方法。使用代表性 TOrC 和合成雨水进行批量和柱测试。基于批量筛选测试，对两种市售生物炭（BN-生物炭和 MCG-生物炭）和一种 AC 进行了研究。 AC 表现出最强的吸附作用，其次是 MCG-生物炭和 BN-生物炭。 Langmuir 等温线比 Freundlich 等温线更适合平衡数据。由于优异的吸附动力学，饱和砂柱中的 0.2 wt% MCG-生物炭比 1.0 wt% BN-生物炭更有效地保留 TOrC。当仅使用批次参数进行校准时，基于 Langmuir 等温线的前向预测颗粒内扩散模型可以充分预测色谱柱结果，如蒙特卡罗不确定性分析所示。案例研究模拟估计，用 F300-AC 或 MCG-生物炭改进的渗透池在 1 英寸/小时的渗透速率下，莠去津的吸附延迟突破时间分别为 54 或 5.8 年。这些结果表明，具有优异吸附能力和动力学的生物炭或活性炭可以增强渗透系统中 TOrC 的保留，并且可以使用批量测试的结果来预测各种条件下的性能。
To assess the effectiveness of biochar and activated carbon (AC) for enhanced trace organic contaminant (TOrC) retention in stormwater infiltration systems, an approach combining forward-prediction modeling and laboratory verification experiments was employed. Batch and column tests were conducted using representative TOrCs and synthetic stormwater. Based on batch screening tests, two commercially available biochars (BN-biochar and MCG-biochar) and an AC were investigated. The AC exhibited the strongest sorption, followed by MCG-biochar and BN-biochar. Langmuir isotherms provided better fits to equilibrium data than Freundlich isotherms. Due to superior sorption kinetics, 0.2 wt % MCG-biochar in saturated sand columns retained TOrCs more effectively than 1.0 wt % BN-biochar. A forward-prediction intraparticle diffusion model based on the Langmuir isotherm adequately predicted column results when calibrated using only batch parameters, as indicated by a Monte Carlo uncertainty analysis. Case study simulations estimated that an infiltration basin amended with F300-AC or MCG-biochar could obtain sorption-retarded breakthrough times for atrazine of 54 or 5.8 years, respectively, at a 1 in./h infiltration rate. These results indicate that biochars or ACs with superior sorption capacity and kinetics can enhance TOrC retention in infiltration systems, and performance under various conditions can be predicted using results from batch tests.