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Effects of sulfuric acid pretreatment and liquid acids precipitation on the structure of fulvic acid extracted from peat
Spectroscopy Letters ( IF 1.7 ) Pub Date : 2020-12-15 , DOI: 10.1080/00387010.2020.1854306
Ya-nan Lu 1 , Li-tong Ma 1, 2 , Jun Li 3
Affiliation  

Abstract

To achieve high-value utilization of peat, the process of coupling methane fermentation and extraction of fulvic acid was explored and the effects of sulfuric acid pretreatment before methane fermentation and different liquid acid precipitation on the spectral characteristic of fulvic acid was studied. The fulvic acid precipitated by nitric acid has a high content and a high degree of aromatization. The highest yield of fulvic acid samples is precipitated by phosphoric acid. The fulvic acid extracted from the residues after sulfuric acid pretreatment methane fermentation descends of yield while content increase. Meanwhile, methane fermentation would consume methyl, hydroxyl, and carboxyl groups without benzene rings consumed. In addition, sulfuric acid pretreatment would promote this process and consume more functional groups to produce more methane. The research results show that coupling methane fermentation of peat and extraction of fulvic acid is feasible, and the sulfuric acid pretreatment has a significant effect to fulvic acid. To sum up, sulfuric acid pretreatment would promote methane fermentation process and degrade more fulvic acid.



中文翻译:

硫酸预处理和液态酸沉淀对泥炭中黄腐酸结构的影响

抽象的

为了实现泥炭的高价值利用,探讨了甲烷发酵与黄腐酸萃取的耦合过程,研究了甲烷发酵前的硫酸预处理和不同的液体酸沉淀对黄腐酸光谱特性的影响。由硝酸沉淀的黄腐酸含量高且芳构化程度高。黄磷酸样品的最高产量是由磷酸沉淀的。硫酸预处理甲烷发酵后,从残留物中提取的黄腐酸产量下降,而含量增加。同时,甲烷发酵将消耗甲基,羟基和羧基,而不消耗苯环。此外,硫酸预处理将促进此过程,并消耗更多的官能团以产生更多的甲烷。研究结果表明,将泥炭甲烷发酵与黄腐酸提取联用是可行的,硫酸预处理对黄腐酸有显着影响。综上所述,硫酸预处理将促进甲烷发酵过程并降解更多的黄腐酸。

更新日期:2021-02-23
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