The effect of sewage sludge (SWS) addition on the H 2 fermentation of food waste (FW) was investigated. It was found that a slight addition of SWS (10:1=FW:SWS on a COD basis) significantly enhanced the H 2 fermentation performance, not only increasing the total amount of H 2 produced but accelerating the whole reaction, shortening the lag period, and increasing the H 2 production rate. Substrate degradation and microbial germination were also facilitated by SWS addition. A simple calculation reveals that the increased amount of H 2 production derived mostly from FW, indicating that SWS addition synergistically enhanced H 2 fermentation performance. This was attributed to the existence of Fe and Ca at much higher concentrations in the SWS compared to the FW. The batch process treating a mixture of FW and SWS was repeated and showed an average H 2 yield of 2.11±0.20mol H 2/mol hexose added, which was 13% higher than that of FW treated alone.
All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Renewable Energy, Sustainability and the Environment
- Waste Management and Disposal