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首页> 外文期刊>Environmental Science & Technology >Impact of natural organic matter on monochloramine reduction by granular activated carbon: The role of porosity and electrostatic surface properties
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Impact of natural organic matter on monochloramine reduction by granular activated carbon: The role of porosity and electrostatic surface properties

机译：天然有机物对颗粒状活性炭还原一氯胺的影响：孔隙率和静电表面性质的作用

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摘要

Steady-state monochloramine reduction in fixed-bed reactors (FBRs) was quantified on five types of granular activated carbon (GAC) using two background waterssone natural source water (LAW) containing 2.5-3.5 mg/L organic carbon and one synthetic organic-free water (NW). While more monochloramine was reduced at steady-state using NW compared to LAW for each GAC and empty-bed contact time studied, the differences in removal varied considerably among the GACs tested. Physical characterization of the GACs suggested that the degree of interference caused by natural organic matter (NOM) increased with increasing GAC surface area contained within pores greater than 2 nm in width. Acid/base and electrostatic properties of the GACs were not found to be significant in terms of NOM uptake, which indicated that size exclusion effects of the GAC pores overwhelmed the impact of the GAC surface chemistry. Therefore, selection of GAC to limit the impact of NOM on monochloramine reduction in FBRs should be based on pore size distribution alone, with the impact of NOM decreasing with decreasing mesoporosity and macroporosity.
机译：使用两种包含2.5-3.5 mg / L有机碳的自然源水和一种不含合成有机物的天然水（LAW），对五种颗粒状活性炭（GAC）定量测定了固定床反应器（FBR）中的稳态一氯胺还原量水（NW）。对于每个GAC和研究的空床接触时间，与Naw相比，使用NW在稳态下可减少更多的一氯胺，但在测试的GAC中，去除的差异差异很大。 GAC的物理特征表明，由天然有机物（NOM）引起的干扰程度随孔内宽度大于2 nm的GAC表面积的增加而增加。就NOM的吸收而言，未发现GAC的酸/碱和静电性质很重要，这表明GAC孔的尺寸排阻效应压倒了GAC表面化学的影响。因此，选择GAC来限制NOM对FBR中一氯胺还原的影响应仅基于孔径分布，而NOM的影响随介孔率和大孔率的降低而降低。

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