萃取剂与预处理对甲烷发酵泥炭腐植酸结构的影响  

Effects of extractant and pretreatment on the structure of humicacid from methane fermentation peat residue

作　　者：路亚楠 马力通[1,2] LU Yanan;MA Litong(School of Chemistry and Chemical Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;Inner Mongolia Engineering Research Center of Comprehensive Utilization of Bio-coal Chemical Industry,Baotou 014010,China)

机构地区：[1]内蒙古科技大学化学与化工学院,内蒙古包头014010 [2]生物煤化工综合利用内蒙古自治区工程研究中心,内蒙古包头014010

出　　处：《洁净煤技术》2021年第6期218-224,共7页Clean Coal Technology

基　　金：国家自然科学基金资助项目(21766025);教育部“春晖计划”合作科研资助项目(2018042);内蒙古科技大学产学研合作培育基金资助项目(PY-201507)。

摘　　要：采用草本泥炭为原料,先进行甲烷发酵,发酵残渣采用碱溶酸析法提取腐植酸,同时分别用碳酸钠、碳酸氢钠、氨水、亚硫酸钠萃取,对得到的腐植酸样品进行紫外可见、红外、荧光光谱表征。甲烷发酵后腐植酸羟基、亚甲基、甲基等简单结构被消耗利用,而苯环、羰基、三键与累积双键等复杂结构无法被消耗利用,氢氧化钠预处理对甲烷发酵有促进作用,消耗更多的脂肪链烃,导致腐植酸产率降低且苯环含量更高,产气量增长1.12倍。不同萃取剂萃取对腐植酸产率、含量、结构有明显影响,碳酸钠萃取腐植酸含量较高,且羟基、亚甲基、羰基、苯环、醚键等官能团含量处于较高水平,亚硫酸钠萃取腐植酸产率较高,含有较多的三键与累积双键。结果表明,萃取剂与预处理对甲烷发酵泥炭腐植酸结构均有影响,氢氧化钠预处理导致腐植酸苯环含量升高,不同萃取剂对腐植酸结构有明显影响。Using herbaceous peat as a raw,the humic acids were extracted by alkali-extraction acid-precipitation method from residue after methane fermentation.At the same time,they were extracted by sodium carbonate,sodium bicarbonate,ammonia water,and sodium sulfite,respectively.In addition,the humic acids were characterized by Ultraviolet-visible spectra,Fourier transform infrared spectroscopy,and Fluorescence spectrum.Simple parts of humic acids such as hydroxyl,methylene,and methyl were consumed and utilized by microorganism,while the complex structures such as benzene ring,carbonyl,triple bond and accumulated double bond cannot be consumed and utilized during the methane fermentation process.Furthermore,sodium hydroxide pretreatment can promote this process and produce more methane.Methane production increases by 1.12 times,and the yield of humic acid is significantly reduced after methane fermentation.Extractions with different extractants have an obvious effect on the yield,content and structure of humic acid.Humic acids extracted by sodium carbonate have a higher content,and the content of hydroxyl,methylene,carbonyl,benzene ring,and ether bond is at a higher level.Humic acids extracted by sodium sulfite have a higher yield and contains more triple bonds and accumulated double bonds.The results of the study show that the process of coupling extracting humic acid from herbaceous peat and the process of sodium hydroxide pretreatment methane fermentation is feasible,and it has a certain reference value for realizing high-value utilization of peat.

关 键 词：草本泥炭 碱溶酸析法 腐植酸 预处理甲烷发酵 萃取剂 

分 类 号：O657.3[理学—分析化学] TQ536[理学—化学]