发酵糠醛渣中生化腐植酸的提取工艺

目的]考察发酵糠醛渣中生化腐植酸的最佳工艺条件。方法]以发酵糠醛渣为原料,采用碱提酸析法提取生化腐植酸(BHA)。通过4因素4水平正交试验,考察固液比(发酵糠醛渣与水的质量比)、碱液浓度、提取温度、提取时间对生化腐植酸提取率的影响,再利用盐酸调节提取液的p H,使生化腐植酸沉淀析出,固液分离烘干后得到成品生化腐植酸。结果]最佳的腐植酸提取工艺条件为碱提步骤固液比1∶8,碱液浓度8%,提取时间为2.5 h,提取温度为70℃,酸析步骤p H为2.5。得到腐植酸含量为76%的固体生化腐植酸成品,其提取率为49%。结论]该研究可为糠醛渣废弃物的开发提供科学依据。

Ex traction Technology of Biological Humic Acid from Fe rmented Furfural Residue

Objective] To investigate the optimal extraction technology of biochemical humic acids ( BHAs) from fermented furfural residue. Method] With fermented furfural residue as the raw materials, BHAs was extracted by alkali-dissolution and acidification method.Four-factor and four-level orthogonal test was used to investigate the effects of solid-liquid ratio ( mass ratio of fermented furfural residue to water) , alkali concentration, extraction temperature and extraction time on the extraction rate of BHAs.Then, pH value of extracting solution was regulated by hydrochloric acid, in order to precipitate BHAs from its extracts.Through the solid-liquid separation and drying, solid BHAs were ob-tained.Results showed that the optimal extracting conditions were as follows:1∶8 solid-liquid ratio, 8% alkali concentration, 70 ℃ extracting temperature, 2.5 h extracting time, and pH 2.5 during alkali dissolution.Under these conditions, solid BHAs containing 76% humic acid content was obtained, and its extraction rate was 49%. Conclusion] This research provides scientific basis for the development of fermented furfural residue.