College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang, 550025, China.
College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang, 550025, China.
Chemosphere. 2022 Dec;308(Pt 2):136324. doi: 10.1016/j.chemosphere.2022.136324. Epub 2022 Sep 6.
In this study, disinfection by-products (DBP) formation from dissolved organic matter (DOM) and its fractions, including both hydrophilic and hydrophobic components, were investigated at a typical karst surface water. The subsequent DBP formation potential was evaluated by deducing chemical characteristics of DOM fractions and representative algal organic matter (Chlorella sp. AOM) under the influence of divalent ions (Ca and Mg) via spectra analysis. Both terrigenous and autochthonous DOM performed as critical DBP precursors, and DBP formation patterns were tightly correlated to organic matter chemical variations. DBP formation was significantly higher in drought period compared to that in wet period (P < 0.05). Particularly, trichloromethane (TCM) and dichloroacetonitrile (DCAN) showed distinct formation patterns compared to the scenarios in non-karst water. For DOM fractions, hydrophobic components showed higher DBP formation compared to hydrophilic counterparts, hydrophilic neutral enriched more reactive organic nitrogen for N-DBPs production. It was preferable to enrich humic-like substances after Ca and Mgcomplexation in Chlorella sp. AOM, TCM formation increased whereas DCAN production remained unchanged in the presence of divalent ions. This study innovatively provided a linkage between chemical characteristics of DOM and understanding of DBP formation in karst surface water.
在这项研究中，我们研究了溶解有机物（DOM）及其各组分（包括亲水性和疏水性组分）在典型的岩溶地表水中生成消毒副产物（DBP）的情况。通过光谱分析，推断 DOM 组分和代表性藻类有机物（小球藻 AOM）在二价离子（Ca 和 Mg）影响下的化学特征，评估了随后的 DBP 生成潜力。陆源和自生 DOM 均为重要的 DBP 前体，DBP 生成模式与有机物化学变化密切相关。与雨季相比，旱季的 DBP 生成量明显更高（P<0.05）。特别是三氯甲烷（TCM）和二氯乙腈（DCAN）的生成模式与非岩溶水中的情况明显不同。对于 DOM 组分，疏水性组分的 DBP 生成量高于亲水性组分，亲水性中性组分富含更多用于生成 N-DBPs 的反应性有机氮。在小球藻 AOM 中，Ca 和 Mg 络合后优先富集会产生腐殖质样物质，TCM 的生成增加，而 DCAN 的生成在二价离子存在下保持不变。本研究创新性地将 DOM 的化学特征与对岩溶地表水的 DBP 生成的理解联系起来。
