Spectroscopic characterization of organic matter of a soil and vinasse mixture during aerobic or anaerobic incubation

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• 作者：Emmanuel Doelsch ; Arm ; Masion ; Patrick Cazevieille ; Nicolas Condom
• 刊名：Waste Management
• 出版年：2009
• 出版时间：June 2009
• 年：2009
• 卷：29
• 期：6
• 页码：1929-1935
• 全文大小：561 K

文摘

Mineralization potentials are often used to classify organic wastes. These methods involve measuring CO₂ production during batch experiments, so variations in chemical compounds are not addressed. Moreover, the physicochemical conditions are not monitored during the reactions. The present study was designed to address these deficiencies. Incubations of a mixture of soil and waste (vinasse at 20 % dry matter from a fermentation industry) were conducted in aerobic and anaerobic conditions, and liquid samples obtained by centrifugation were collected at 2 h, 1 d and 28 d. Dissolved organic carbon (DOC) patterns highlighted that: there was a “soil effect” which increased organic matter (OM) degradation in all conditions compared to vinasse incubated alone; and OM degradation was faster under aerobic conditions since 500 mg kgp>−1p> of C remained after aerobic incubation, as compared to 4000 mg kgp>−1p> at the end of the anaerobic incubation period. No changes were detected by Fourier transform infrared spectroscopy (FTIR) between 2 h and 1 d incubation. At 28 days incubation, the FTIR signal of the aerobic samples was deeply modified, thus confirming the high OM degradation. Under anaerobic conditions, the main polysaccharide contributions (ν(C–O)) disappeared at 1000 and 1200 cmp>−1p>, as also confirmed by the p>13p>C NMR findings. Under aerobic incubation, a 50 % decrease in the polysaccharide proportion was observed. Under anaerobic conditions, significant chemical modifications of the organic fraction were detected, namely formation of low molecular weight organic acids.