Lime mud from paper-making process addition to food waste synergistically enhances hydrogen fermentation performance |
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| Authors: | Jishi Zhang Qinqing Wang Jianguo Jiang |
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| Affiliation: | 1. Department of Environmental Science and Engineering, Shandong Polytechnic University, Jinan 250353, China;2. Key Laboratory of Cleaner Production and Industrial Wastes Recycling and Resourcization in Universities of Shandong, Jinan 250353, China;3. School of Food and Bioengineering, Shandong Polytechnic University, Jinan 250353, China;4. School of Environment, Tsinghua University, Beijing 100084, China |
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| Abstract: | The effect of lime mud from paper-making process (LMP) addition on the H2 fermentation of food waste (FW) was investigated. It was found that a slight addition of LMP (1.0–4.0 g in 200 g FW) significantly enhanced the H2 fermentation performance, not only increasing the total amount of H2 produced but also accelerating the whole reaction, shortening the lag period, and increasing the H2 production rate. Fermentation stability and microbial germination were also facilitated by LMP addition. This was attributed to the existence of Ca, Fe, Mn and alkaline substances such as CaCO3 and NaOH. The batch process treating a mixture of FW and LMP was showed that the highest hydrogen production of 137.6 mL H2/g VS was achieved at final pH 5.0, adding 3 g LMP (in 200 g FW) to the fermentation process, which lag-phase time was about 2.5 h. |
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| Keywords: | Hydrogen fermentation Food waste Lime mud from paper-making process Buffers Nutrients |
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