城市污水厂剩余污泥中腐殖酸化学组成与结构特征
Chemical composition and structural characteristics of humic acid extracted from excess sludge in municipal wastewater treatment plants
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摘要: 采用元素分析、傅里叶红外光谱、固体13C核磁共振以及三维荧光光谱技术，对不同污水处理厂剩余污泥中腐殖酸的化学组成和结构特征进行对比分析.结果表明，不同腐殖酸的化学组成极其相似，但在结构特征上存在明显差异.元素分析计算结果发现，不同腐殖酸的H/C、O/C和C/N的比值存在差异，说明其结构存在差异.荧光光谱显示各个腐殖酸均存在两个明显的特征峰.荧光指数表明各个腐殖酸均为生物源腐殖酸，与元素分析测得的H/C结论一致.傅里叶红外分析显示A厂腐殖酸的各个官能团吸收峰最大、即各个官能团含量最多，C厂含有最少的含氧官能团.13C-NMR结果表明，A厂腐殖酸含有最多的脂肪碳和芳香碳结构，而D厂腐殖酸与之相反.Abstract: Chemical composition and structures of humic acids (HAs) in the excess sludge from different municipal wastewater treatment plants (WWTP) were determined by using elemental analysis, Fourier transformed infrared (FT-IR) spectroscopy, solid-state CP TOSS MAS 13C nuclear magnetic resonance (13C-NMR) spectroscopy and three dimensional fluorescence excitation-emission-matrix (3DEEM) spectroscopy. The results showed that the HAs presented almost the same chemical composition. However, the structures of the HAs were significantly different. The results of elemental analysis showed different HAs had different H/C, O/C, and C/N atomic ratios, which indicated that HAs had different structures. The 3DEEM spectra of all HAs samples presented two characteristic peaks. The fluorescence index showed that all HAs were generated from the biological source, which was consistent with the H/C results of elemental analysis. The results of FT-IR spectra of HAs from plant A showed the maximum absorption peaks for the various functional groups of humic acid. This indicated that the HAs of plant A had the highest content of functional group. While, the HA of plant C contained the least content of oxygen containing functional groups. The results of 13C-NMR indicated that the HA of plant A had the highest content of carbon and aromatic carbon structure compounds, while plant D contained the least content of such structure compounds.
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Key words:
- excess sludge /
- humic acids /
- elemental analysis /
- fourier transform infrared /
- 13C-NMR /
- 3DEEM /
- municipal wastewater treatment plant
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