HuDexiu,YangYuanzhu,YanYixin,et al.Effect of Different Redox Mediators on Acid Production from Anaerobic Fermentation of Waste Activated Sludge[J].China Water & Wastewater,2026,42(13):115-121.
Effect of Different Redox Mediators on Acid Production from Anaerobic Fermentation of Waste Activated Sludge
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第42卷
Number:
第13期
Page:
115-121
Column:
Date of publication:
2026-07-01
- Abstract:
- In order to improve the efficiency of acid production from anaerobic fermentation of waste activated sludge, three redox mediators (ROMs)—sodium anthraquinone-2-sulfonate (AQS), sodium 1,2-naphthoquinone-4-sulfonate (NQS), and straw biochar (BC)—were selected to investigate their effects on the concentration and composition of volatile fatty acid (VFA), organic matter dissolution, and microorganisms during the anaerobic fermentation of waste activated sludge. The results showed that the peak day of acid production in each group was day 5. The highest VFA concentration (calculated as COD) was 872.01 mg/L in the 1 mmol/L AQS group, which was 2.05 times that of the control group. The maximum acid yield in the 100 μmol/L NQS group was 437.62 mg/L, which was 3.04% higher than that of the control group. In contrast, BC inhibited sludge fermentation, with VFA concentrations ranging from only 23.12% to 43.69% of those in the control group. All three ROMs increased the combined proportion of acetic acid and propionic acid in the VFA composition. The combined proportions of acetic acid and propionic acid in the 1 mmol/L AQS, 100 μmol/L NQS, and 5 g/L BC groups were 5.11 times, 2.57 times, and 2.28 times those of the control group, respectively. Analysis of the functional microbial community structure indicated that 1 mmol/L AQS group exhibited the best enrichment of acid-producing bacteria, while 4 mmol/L AQS group promoted the enrichment of acetic acid-producing dominant bacteria, with a slight decrease in species diversity.
Last Update:
2026-07-01