Lime mud from paper-making process addition to food waste synergistically enhances hydrogen fermentation performance

摘要

The effect of lime mud from paper-making process (LMP) addition on the H_2 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 H_2 fermentation performance, not only increasing the total amount of H_2 produced but also accelerating the whole reaction, shortening the lag period, and increasing the H_2 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 CaCO_3 and NaOH. The batch process treating a mixture of FW and LMP was showed that the highest hydrogen production of 137.6 mL H_2/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.