活性污泥和泥炭土有机质分子组成差异及其对有机污染物的吸附影响  

The difference in molecular composition of organic matter between biosolids and peat and their effects on the adsorption of organic contaminants

作　　者：李宇轩 李炎 李中文 净婷菲 梁妮[1,2,3] 李芳芳 LI Yuxuan;LI Yan;LI Zhongwen;JING Tingfei;LIANG Ni;LI Fangfang(Faculty of Environmental Science&Engineering,Kunming University of Science&Technology,Kunming,650500,China;Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control,Kunming,650500,China;Yunnan Provincial Scientific Innovation Team of Soil Environment and Ecological Safety,Kunming University of Science&Technology,Kunming,650500,China)

机构地区：[1]昆明理工大学环境科学与工程学院,昆明650500 [2]云南省土壤固碳与污染控制重点实验室,昆明650500 [3]昆明理工大学土壤环境与生态安全云南省创新团队,昆明650500

出　　处：《环境化学》2022年第8期2752-2760,共9页Environmental Chemistry

基　　金：国家自然科学基金青年基金(41907300);云南省科技计划项目(202001AU070088);云南省教育厅科学研究基金(2016CYH06)资助。

摘　　要：土壤有机质(SOM)是控制土壤环境中有机污染物迁移转化的关键组分,不同来源土壤有机质的组成、矿物保护机制及其对有机污染物的吸附差异还不够明确.本研究采用分子生物标志物技术结合元素组成及比表面积分析表征酸处理前后的活性污泥和滇池底泥的有机质变化,进一步考察其对菲(PHE)和双酚A(BPA)的吸附特征.结果表明,活性污泥中可提取游离态脂组分和木质素酚类组分要低于泥炭土,但降解程度要远高于泥炭土.活性矿物去除后,泥炭土中游离态脂含量明显增加,而活性污泥的游离态脂含量稍有减少,这可能是因为活性污泥游离态脂主要以短链脂肪碳为主,在酸处理过程中容易导致流失.而糖类的显著增加证明了易分解有机碳组分在土壤中被稳定保存.活性污泥和泥炭土中的木质素酚类的含量随着酸处理显著减少,这表明与活性矿物结合的木质素酚类具有更高的氧化程度,导致其溶解性增强.此外,游离态脂降解程度在去除活性矿物后呈降低趋势,而木质素酚类的降解程度却呈增大趋势,这说明活性矿物选择性保护降解程度低的游离态脂和降解程度高的木质素酚类.对于菲的吸附,两种土壤在去除活性矿物后因为极性组分的流失,吸附能力均有所提升,但对于双酚A的吸附,活性污泥由于在酸处理后木质素酚类和游离态脂的减少暴露出更多的吸附位点,而呈现出了吸附能力升高的趋势,泥炭土则因其被丰富的有机质包裹,在去除活性矿物后没太大变化.本研究为揭示不同源SOM与有机污染物之间的相互作用具有重要意义.Soil organic matter(SOM)is a key component for controlling the migration and transformation of organic contaminants in the soil environment.The molecular composition of SOM from different sources,mineral protection mechanisms and their differences in the adsorption of organic contaminants remain unclear.In this study,molecular biomarker technology combined with elemental analysis and specific surface area was used to characterize the organic matter composition in biosolids and Dianchi peat before and after acid treatment,and further investigated its adsorption characteristics for phenanthrene(PHE)and bisphenol A(BPA).The results showed that the amounts of extractable free lipids and lignin derived phenols are lower in the biosolids than in the peat,but the degradation degree of biosolids were much higher than that of peat.After reactive minerals were removed,the free lipids content in the peat increased significantly,while the free lipids in the biosolids decreased slightly.This may be attributed to the fact that the free lipids in the biosolids,mainly including short-chain fatty carbons,were dissolved during the acid treatment.In addition,a large number of sugars were released and detected.This result proved that the easily degraded organic matters are well-preserved in the soil.The contents of lignin derived phenols in biosolids and peat decreased significantly after acid treatment,which indicated that the lignin derived phenols associated with reactive minerals have a higher oxidation degree.In addition,the degradation of free lipids showed a decreasing trend after the removal of reactive minerals,while the degradation of lignin phenols showed an increasing trend.This result suggested that reactive minerals selectively protected free lipids with a low degree of degradation and lignin phenols with a high degree of degradation.For the adsorption of PHE,the adsorption capacity of the two soils were improved due to the loss of polar components after the removal of reactive minerals.For the adsorption of BPA,the bi

关 键 词：土壤有机质 生物标志物 矿物去除 有机污染物 

分 类 号：X703[环境科学与工程—环境工程]