以重金属污染土壤种植的菊芋块茎为原料经过磷酸水解后发酵产生乙醇,对水解条件、转化性能及重金属在乙醇生产各环节的归趋进行研究。结果显示：水解磷酸浓度4%、温度90 ℃、时间180 min,固液比1:6时,还原糖产率高达92.40%。水解糖液发酵48 h后乙醇产量达53.04 g/L,转化率高达理论转化率的94.00%。乙醇生产中,40%~90%的重金属物质进入废渣废液系统,进入乙醇的部分小于2%,表明重金属污染土壤种植菊芋对后续乙醇转化无影响,在实际生产中应加强废渣的重金属管控。
Abstract
In this work, Jerusalem artichoke tubers harvested from the heavy metal polluted soil were employed to produce ethanol via phosphoric acid hydrolysis and fermentation. The hydrolysis conditions, ethanol fermentation performance and the distribution of heavy metals in each stream of ethanol production were investigated. Results indicated that the suitable conditions for yielding the reducing sugar from tuber is phosphoric acid concentration of 4%, temperature of 90 ℃, hydrolysis duration of 180 min, and solid-liquid ratio of 1:6, by which the reducing sugar yield reachs 92.40%. The subsequent ethanol yield reachs 53.04 g/L within 48 h with the conversion rate of 94.00%. In the whole process of ethanol production, 40%-90% of heavy metals enter the waste residue and waste liquid system, and less than 2% enter the ethanol part, thus, it should be paid more attentions on the fermented mash, especially on the solid part of the fermented residues.
关键词
生物乙醇 /
水解 /
发酵 /
重金属 /
菊芋块茎
Key words
bioethanol /
hydrolysis /
fermentation /
heavy metal /
Jerusalem artichoke tuber
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基金
成都市重点研发支撑计划（2020-YF09-00039-SN）
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