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Enhanced volatile fatty acid degradation and methane production efficiency by biochar addition in food waste-sludge co-digestion: A step towards increased organic loading efficiency in co-digestion.
Bioresource Technology ( IF 9.7 ) Pub Date : 2020-03-26 , DOI: 10.1016/j.biortech.2020.123250 Guneet Kaur 1 , Davidraj Johnravindar 1 , Jonathan W C Wong 2
Bioresource Technology ( IF 9.7 ) Pub Date : 2020-03-26 , DOI: 10.1016/j.biortech.2020.123250 Guneet Kaur 1 , Davidraj Johnravindar 1 , Jonathan W C Wong 2
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This work investigated the effect of biochar addition to mitigate VFA accumulation and enhance methane production in mesophilic food waste/sludge co-digestion. Different types of biochar derived from agricultural and forestry residues at two pyrolysis temperatures were tested. Results showed that wheat straw biochar 550 °C supported the highest specific methane yield of 381.9 LCH4/kg VSadded and VS removal efficiency of 41.62% among all treatments. Degradation of propionic acid and long-chain fatty acids such as valeric, caproic and isovaleric acids was observed. This also corresponded to an increase in methanogenic favorable substrates including acetic acid (>40%) and butyric acid (~20%) over the control. Consequently, a 24% increase in overall methane production was obtained as compared to control. This demonstrated that biochar addition had positive effects on VFA degradation and methane production which could be a useful strategy to increase the organic loading in co-digestions without the fear of process failure.
中文翻译：
通过在食物垃圾-污泥共消化中添加生物炭，提高了挥发性脂肪酸的降解和甲烷的生产效率：这是共消化中提高有机负荷效率的一步。
这项工作研究了生物炭添加在中温食物垃圾/污泥共消化中减轻VFA积累和提高甲烷产量的作用。测试了在两种热解温度下源自农业和林业残留物的不同类型的生物炭。结果表明，在所有处理中，550°C的小麦秸秆生物炭支持最高的比甲烷产量381.9 LCH4 / kg VS添加和VS去除效率为41.62％。观察到丙酸和长链脂肪酸（如戊酸，己酸和异戊酸）的降解。这也对应于甲烷生成的有利底物的增加，包括乙酸（> 40％）和丁酸（〜20％）。因此，与对照相比，甲烷的总产量增加了24％。
更新日期：2020-03-27
中文翻译：
通过在食物垃圾-污泥共消化中添加生物炭，提高了挥发性脂肪酸的降解和甲烷的生产效率：这是共消化中提高有机负荷效率的一步。
这项工作研究了生物炭添加在中温食物垃圾/污泥共消化中减轻VFA积累和提高甲烷产量的作用。测试了在两种热解温度下源自农业和林业残留物的不同类型的生物炭。结果表明，在所有处理中，550°C的小麦秸秆生物炭支持最高的比甲烷产量381.9 LCH4 / kg VS添加和VS去除效率为41.62％。观察到丙酸和长链脂肪酸（如戊酸，己酸和异戊酸）的降解。这也对应于甲烷生成的有利底物的增加，包括乙酸（> 40％）和丁酸（〜20％）。因此，与对照相比，甲烷的总产量增加了24％。
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