MENGFan-li,PENGXiao-jing,LIQing-kun.Influence of Sodium Hypochlorite on Acid Production during Anaerobic Fermentation of Excess Sludge[J].China Water & Wastewater,2025,41(21):130-134.
次氯酸钠对剩余污泥厌氧发酵产酸的影响
- Title:
- Influence of Sodium Hypochlorite on Acid Production during Anaerobic Fermentation of Excess Sludge
- 关键词:
- 剩余污泥; 厌氧发酵; 次氯酸钠; 短链脂肪酸(SCFA); 酶活性
- Keywords:
- excess sludge; anaerobic fermentation; sodium hypochlorite; short-chain fatty acids (SCFA); enzyme activity
- 摘要:
- 为强化污泥厌氧发酵积累产生短链脂肪酸（SCFA），探究次氯酸钠（SH）对剩余污泥（ES）厌氧发酵产酸的影响，并对相关机制进行解析。结果表明，SH能提高污泥厌氧发酵产SCFA，且SH最佳浓度为3%，对应的SCFA最大值（以VSS计）为186.5 mg/g，是空白组的1.95倍。SH可促进污泥裂解，提高发酵体系内溶解性化学需氧量、溶解性蛋白质和溶解性多糖的浓度，为产酸微生物提供物质保障。另外，SH会促进NH4+-N释放，且NH4+-N释放量与SH浓度呈正相关。酶活性分析表明，SH提高了与水解和酸化过程相关的关键酶活性，降低了辅酶F420的活性，进而提高了SCFA的积累量。研究结果丰富了SH的应用领域，可为ES高效资源化利用提供理论依据。
- Abstract:
- This study investigated the influence of sodium hypochlorite (SH) on acid production in anaerobic fermentation of excess sludge (ES), and systematically analyzed the underlying mechanisms, so as to enhance the accumulation of short?chain fatty acids (SCFA) during the anaerobic fermentation of sludge. SH enhanced the production of SCFA during sludge anaerobic fermentation. The optimal concentration of SH was determined to be 3%, at which the maximum SCFA yield (calculated by VSS) reached 186.5 mg/g, representing a 1.95?fold increase compared to the blank group. SH promoted sludge pyrolysis, thereby increasing the soluble chemical oxygen demand, dissolved protein concentration, and dissolved polysaccharide concentration in the fermentation system, providing essential substrate support for acidogenic microorganisms. Additionally, SH facilitated the release of NH4+-N, with its concentration showing a positive correlation with the released NH4+-N. Enzyme activity analysis revealed that SH enhancedthe activities of key enzymes associated with hydrolysis and acidification, reduced coenzyme F420 activity, and consequently promoted the accumulation of SCFA. The findings expand the application domains of SH and provide a theoretical foundation for the efficient utilization of resources in ES.
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