ENHANCED BIOGAS PRODUCTION FROM ANAEROBIC DIGESTION OF FOOD WASTE BY MODIFIED BIOCHAR AND ITS MECHANISM

Li Meichun; Zhou Biao; Zhang Tiejian; Wang Qiuyuan; Zhang Liyong; Liu Junliang

doi:10.19912/j.0254-0096.tynxb.2023-1227

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (11) : 517-527. DOI: 10.19912/j.0254-0096.tynxb.2023-1227

ENHANCED BIOGAS PRODUCTION FROM ANAEROBIC DIGESTION OF FOOD WASTE BY MODIFIED BIOCHAR AND ITS MECHANISM

Li Meichun, Zhou Biao, Zhang Tiejian, Wang Qiuyuan, Zhang Liyong, Liu Junliang

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Abstract

Three kinds of biochar additives, namely, low temperature pyrolysis biochar （BC）, acid-modified biochar （SBC） and acid-magnetic composite modified biochar （MSBC）, were prepared and investigated for their effects on the anaerobic digestion performance of food waste at different additive levels （1,3,5,7 g/L）. The results showed that the three biochar additives were able to increase the cumulative biogas production of kitchen waste, and the test group with 3 g/L MSBC had the most significant effect, which was 59.13% higher than that of the blank control group. Low-temperature pyrolysis biochar （BC）, acid-modified biochar （SBC） and acid-magnetic composite modified biochar （MSBC） were prepared from corn stover as the raw material, and the effects of the three biochar additives on the biogas production of anaerobic digestion of kitchen waste were investigated at different dosage levels （1,3,5,7 g/L）, and the biogas production of the three groups was improved. The biogas production efficiency of all three biochar additive groups was effectively improved. Among them, the test groups with BC, SBC and MSBC increased 36.87%, 43.88% and 59.13%, respectively, compared with the blank control group, which showed that the addition of MSBC had the best effect on the gas production from kitchen waste. The kinetic parameters of gas production also showed that the addition of MSBC could significantly increase the biogas production potential of the digestive system, improve the gas production rate and shorten the delay period. In addition, the intrinsic relationship between fermentation conditions, gas production kinetic parameters and environmental factors was clarified by principal component analysis （PCA）, and it was found that the biogas production could be influenced by varying the amount of MSBC additives, which in turn regulated the system AN concentration and volatile acid concentration. Thus, MSBC can be used as an effective biochar composite material to achieve energy efficiency and ecological benefits of kitchen waste resource treatment process by coupling anaerobic digestion technology.

Key words

modified biochar / anaerobic digestion / methane / Fe₃O₄ / kitchen waste

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Li Meichun, Zhou Biao, Zhang Tiejian, Wang Qiuyuan, Zhang Liyong, Liu Junliang. ENHANCED BIOGAS PRODUCTION FROM ANAEROBIC DIGESTION OF FOOD WASTE BY MODIFIED BIOCHAR AND ITS MECHANISM[J]. Acta Energiae Solaris Sinica. 2024, 45(11): 517-527 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1227

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