YUANHong-ying,LIQi,ZHANGJia-yi,et al.Anaerobic Fermentation of Sludge to Produce Acid Promoted by Addition of Protein Food Waste[J].China Water & Wastewater,2022,38(17):100-103.
Anaerobic Fermentation of Sludge to Produce Acid Promoted by Addition of Protein Food Waste
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第17期
Page:
100-103
Column:
Date of publication:
2022-09-01
- Abstract:
- To improve the yield of short-chain fatty acids (SCFAs) in fermentation systems, protein food waste was added to the excess sludge at a total solid (TS) mass ratio of 1∶1, and batch experiment with fermentation cycle of 8 days was carried out to investigate the effect of different pH on the yield of SCFAs. The addition of protein food waste to excess sludge could significantly increase the SCFAs yield.The maximum SCFAs yield in the mixed substrate was 215.9 mgCOD/gTS, which was 6.1 times that of the single sludge.The addition of protein food waste not only increased the protein content in the mixed substrate, but also provided easily biodegradable proteins for the microorganisms, which led to the increase of SCFAs yield. Strongly alkaline condition was beneficial for protein-rich mixed substrate to produce SCFAs, which was attributed to the significant increase in soluble COD (SCOD). The SCOD of the experimental group with pH of 10 was much higher than that of the other control groups, which provided a substrate for the subsequent reactions. Analysis of the composition of SCFAs in mixed substrate at pH of 10 showed that acetic acid was the main component, followed by propionic acid.
Last Update:
2022-09-01