Continuous H2 and CH4 production from high-solid food waste in the two-stage thermophilic fermentation process with the recirculation of digester sludge.
Continuous H2 and CH4 production from high-solid food waste in the two-stage thermophilic fermentation process with the recirculation of digester sludge.
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DOI：
10.1016/j.biortech.2009.03.037
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发表时间：
2010
影响因子：
11.4
通讯作者：
Dong-Yeol Lee;Y. Ebie;Kaiqin Xu;Y. Li;Y. Inamori
中科院分区：
文献类型：
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作者：
Dong-Yeol Lee;Y. Ebie;Kaiqin Xu;Y. Li;Y. Inamori
在不同的有机负荷率（OLRs）下，对使用10%总固体（TS）食物垃圾的嗜热两阶段发酵过程进行了测试。该系统配置为结合化学需氧量（COD）、脱氮以及通过从污泥储罐返回污泥作为碱缓冲液来调节pH以进行反硝化，从而产生H2和CH 4。使用污泥再循环（Qr/Qiratio 1）将H2发酵反应器中的pH保持在5.4-5.7的范围内。在OLR为39（H2发酵反应器）和4.16gCOD l−1d−1（CH 4发酵反应器）的条件下，H2和CH 4的平均产率分别为11. 1 l-H2 l −1-fed d−1和47. 4l-CH 4l −1-fed d−1。这些结果表明，连续两阶段工艺的长期稳定性可以通过再循环6.7-7.5gl−1as CaCO 3的高碱度污泥成功实现，而无需任何外部化学缓冲剂。
A thermophilic two-stage fermentation process using 10% total solids (TS) food waste was tested at varying organic loading rates (OLRs). The system was configured to produce H2and CH4in conjugation with the chemical oxygen demand (COD), nitrogen removal, and adjustment of the pH by returning sludge as an alkali buffer from the sludge storage tank for denitrification. The pH in the H2fermentation reactor was maintained in the range of 5.4–5.7 using sludge recirculation (Qr/Qiratio 1). The average H2(11.1l-H2l−1-fed d−1) and CH4(47.4l-CH4l−1-fed d−1) production rates were achieved at OLRs of 39 (H2fermentation reactor) and 4.16gCOD l−1d−1(CH4fermentation reactor), respectively. These results suggest that long-term stability of the continuous two-stage process can be successfully achieved by recirculation of high-alkalinity sludge of 6.7–7.5gl−1as CaCO3, without any added external chemical buffer.