LUOLiming,DINGLuming,ZHOUZhiwei.Adsorption Characteristics and Mechanism of Algal Organic Matter Using Granular Activated Carbon[J].China Water & Wastewater,2026,42(9):47-53.
颗粒活性炭吸附去除藻源有机物特性与机制
- Title:
- Adsorption Characteristics and Mechanism of Algal Organic Matter Using Granular Activated Carbon
- Keywords:
- granular activated carbon; adsorption characteristics; algal organic matter; advanced water treatment
- 摘要:
- 湖库水源水季节性藻华引发的藻源有机物（AOM）污染给常规水处理工艺带来了严峻挑战。为此，研究了3种颗粒活性炭（GAC）吸附去除AOM的特性，阐明了GAC吸附AOM的作用机制，并探讨了GAC去除AOM与萨旺尼河天然有机物（SRNOM）复合污染物的适用性。结果表明，桃壳、椰壳和杏壳3种GAC都是以<1 nm的微孔为主，其中椰壳炭微孔最多，杏壳炭的中孔和大孔占比最高。杏壳炭吸附AOM的性能最佳，对UV254和DOC的最高去除率分别为59.76%和26.71%；pH为6~7的弱酸性条件和35 ℃水温更利于AOM的去除。GAC对类腐殖质物质和分子质量（MW）为30~100 ku的有机组分吸附效果较好，而对类蛋白质物质和MW<10 ku的有机组分吸附效果较差。GAC吸附过程涉及孔隙填充和C—N键相互化学作用。杏壳炭吸附AOM-SRNOM复合污染物的效果最佳，对UV254和DOC的去除率分别为71.62%和38.84%。
- Abstract:
- Seasonal algal blooms in reservoir water sources lead to the release of algal organic matter (AOM), posing significant challenges to conventional drinking water treatment processes. This study investigated the characteristics of three granular activated carbons (GACs) for AOM adsorption, elucidated the underlying adsorption mechanisms, and evaluated the applicability of GAC for removing composite pollutants consisting of AOM and Savannah River natural organic matter (SRNOM). The results showed that the three GACs derived from peach shell, coconut shell, and apricot shell were all dominated by micropores smaller than 1 nm. Among them, coconut shell GAC possessed the highest micropore content, whereas apricot shell GAC exhibited the largest proportion of mesopores and macropores. Apricot shell GAC demonstrated the best adsorption performance for AOM, achieving maximum removal efficiencies of 59.76% for UV254 and 26.71% for DOC. Weakly acidic conditions with pH of 6-7 and water temperature of 35 ℃ were found to be more favorable for AOM removal. GAC showed higher adsorption efficiency for humic?like substances and organic fractions within the molecular weight range of 30-100 ku, while the removal of protein-like substances and organic fractions smaller than 10 ku was relatively limited. The adsorption process involved pore-filling effects and chemical interactions associated with C—N bonds. Apricot shell GAC exhibited the highest adsorption efficiency for AOM-SRNOM composite pollutants, achieving removal efficiencies of 71.62% for UV254 and 38.84% for DOC.
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