EFFECTS OF PRETREATMENT WITH ACID, ALKALI, OXIDATION REAGENT AND LOW TEMPERATURE FREEZING-THAWING ON METHANE PRODUCTION BY ANAEROBIC FERMENTATION OF SORGHUM STRAW

Li Tianpei; Ding Weimin; Chai Xicun; Guo Binbin; Sun Jie

doi:10.19912/j.0254-0096.tynxb.2020-0550

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (3) : 492-500. DOI: 10.19912/j.0254-0096.tynxb.2020-0550

EFFECTS OF PRETREATMENT WITH ACID, ALKALI, OXIDATION REAGENT AND LOW TEMPERATURE FREEZING-THAWING ON METHANE PRODUCTION BY ANAEROBIC FERMENTATION OF SORGHUM STRAW

Li Tianpei, Ding Weimin, Chai Xicun, Guo Binbin, Sun Jie

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Abstract

Using sorghum straw as raw material, the effects of acid, alkali, oxidation reagent and low temperature freeze-thaw pretreatment on methane production by mixed anaerobic fermentation of sorghum straw and biogas sludge were studied. The results showed that the content of sorghum straw components in each group was significantly different from that in CK control group （p<0.05）. The lignin removal rate is between 29.85%~41.71%, Cellulose relative content increased between 10.08%~17.27%, hemicellulose removal rate was between 1.3%~9.62%. Pretreatment effectively changed the macro and micro structure of sorghum straw. Moreover, the pretreatment changed the structure of sorghum straw. The connection between cellulose, hemicellulose and lignin was interrupted, lignin was removed. The cumulative methane production in each test group was 30.69%~90.28%, higher than in the CK control group. The experimental group pretreated with 5% glacial acetic acid and low-temperature freezing-thawing had the maximum cumulative methane production of 351.85 mL/（g·VS） during the test period. The Logistic growth curve equation has a good fitting effect on methanogenesis of sorghum stalk mixed with biogas sludge during the test cycle. The cumulative methane production can be reasonably explained and accurately predicted. Economy and energy analysis can provide a reference for large-scale production.

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biomass energy / methane / anaerobic fermentation / curve fitting / sorghum straw / low temperature freeze-thaw

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Li Tianpei, Ding Weimin, Chai Xicun, Guo Binbin, Sun Jie. EFFECTS OF PRETREATMENT WITH ACID, ALKALI, OXIDATION REAGENT AND LOW TEMPERATURE FREEZING-THAWING ON METHANE PRODUCTION BY ANAEROBIC FERMENTATION OF SORGHUM STRAW[J]. Acta Energiae Solaris Sinica. 2022, 43(3): 492-500 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0550

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