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.
不同氧化还原介体对剩余污泥厌氧发酵产酸的影响
- Title:
- Effect of Different Redox Mediators on Acid Production from Anaerobic Fermentation of Waste Activated Sludge
- 摘要:
- 为了提高剩余污泥厌氧发酵产酸效率，选择蒽醌-2-磺酸钠（AQS）、1，2-萘醌-4-磺酸钠（NQS）和秸秆生物炭（BC）三种氧化还原介体（ROMs），探究不同ROMs对剩余污泥厌氧发酵中挥发性脂肪酸（VFA）浓度及组分、有机物溶出和微生物的影响。结果表明，各组产酸峰值日均为第5天。1 mmol/L AQS组的VFA浓度（以COD计）最大，为872.01 mg/L，是对照组的2.05倍；100 μmol/L NQS组的最大产酸量为437.62 mg/L，比对照组提升了3.04%；而BC对污泥发酵有抑制作用，VFA浓度仅为对照组的23.12%~43.69%。3种ROMs都增加了VFA组分中乙酸和丙酸总量占比，1 mmol/L AQS组、100 μmol/L NQS组、5 g/L BC组的乙酸和丙酸总量占比分别为对照组的5.11、2.57、2.28倍。功能微生物群落结构分析表明，1 mmol/L AQS组的产酸菌富集效果最好，4 mmol/L AQS组促进了产乙酸优势菌种富集，物种多样性稍有降低。
- 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.
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