WANGChenghong,ZHANGZeqian,SONGXiulan,et al.Effect of Peracetic Acid Combined with Free Ammonia Pretreatment on Acid Production during Sludge Anaerobic Fermentation[J].China Water & Wastewater,2026,42(1):105-111.
过氧乙酸联合游离氨预处理对污泥发酵产酸的影响
- Title:
- Effect of Peracetic Acid Combined with Free Ammonia Pretreatment on Acid Production during Sludge Anaerobic Fermentation
- Keywords:
- sludge; anaerobic fermentation; volatile fatty acids; peracetic acid; free ammonia; pretreatment; microbial community
- 摘要:
- 针对污泥厌氧发酵时间周期长、有机质利用率低，采用过氧乙酸（PAA）联合游离氨（FA）预处理强化污泥厌氧发酵产酸。探讨了PAA联合FA（PAA+FA）预处理对污泥产酸效果及微生物群落结构的影响，分析了空白组、PAA组、FA组、PAA+FA组的挥发性脂肪酸产生、溶解性有机物释放、氨氮溶出以及功能菌群的变化情况。结果表明，PAA+ FA预处理能有效促进污泥溶解和产酸，PAA+FA组的溶解性碳水化合物、蛋白质和溶出的氨氮浓度远高于空白组、PAA组和FA组，PAA+FA组污泥产酸量最大为434.76 mg/gVSS，分别为空白组、PAA组和FA组的15.31、1.59和3.99倍。三维激发-发射矩阵荧光光谱（3D-EEM）分析表明，PAA+FA预处理可以有效破解胞外聚合物（EPS），提高了污泥黏液层EPS的可生物降解性。高通量测序分析表明，PAA+FA预处理促进了Macellibacteroides、Proteiniclasticum和Proteocatella等水解酸化菌的生长和富集，有利于挥发性脂肪酸的产生。
- Abstract:
- Given the prolonged cycle and low organic matter utilization efficiency associated with sludge anaerobic fermentation, a pretreatment strategy combining peracetic acid (PAA) and free ammonia (FA) was employed to enhance sludge anaerobic fermentation process. The effects of PAA combined with FA (PAA+FA) pretreatment on volatile fatty acids (VFAs) production and microbial community structure in sludge were investigated. The generation of VFAs, the release of dissolved organic matters, the dissolution of ammonia nitrogen, as well as the dynamics of functional bacterial communities, were systematically analyzed and compared across the blank, PAA, FA, and PAA+FA groups. Pretreatment with PAA+FA effectively enhanced sludge dissolution and VFAs production. The concentrations of dissolved carbohydrates, proteins, and released ammonia nitrogen in the PAA+FA group were significantly higher than those in the blank, PAA, and FA groups. The maximum VFAs production in the PAA+FA group reached 434.76 mg/gVSS, representing 15.31 times, 1.59 times, and 3.99 times compared to the blank, PAA, and FA groups, respectively. Three-dimensional excitation-emission matrix fluorescence spectroscopy (3D-EEM) analysis revealed that the PAA+FA pretreatment effectively disrupted extracellular polymeric substances (EPS) and enhanced their biodegradability within the sludge mucus layer. High-throughput sequencing analysis revealed that pretreatment with PAA+FA facilitated the growth and enrichment of hydrolytic and acidogenic bacteria, including Macellibacteroides, Proteiniclasticum, and Proteocatella, thereby promoting the production of VFAs.
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