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化工学报  2015 

好氧饥饿对膨胀污泥硝化性能及污泥特性的影响

DOI: 10.11949/j.issn.0438-1157.20141138, PP. 1142-1149

Keywords: 好氧饥饿,膨胀污泥,亚硝化,恢复,衰减速率,污泥形态

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Abstract:

采用SBR好/缺氧工艺,考察了好氧饥饿对于丝状菌膨胀污泥中硝化细菌活性及污泥性能的影响。结果表明,14d的好氧饥饿过程(无外加底物,保持曝气)中,氨氧化细菌(ammonia-oxidizingbacteria,AOB)表现出更高的饥饿敏感性,其好氧衰减速率[(0.42±0.06)d-1)高于亚硝酸盐氧化菌(nitrite-oxidizingbacteria,NOB)的好氧衰减速率[(0.34±0.05)d-1]。恢复阶段初期,系统出现了明显的亚硝酸盐积累现象,这主要归因于AOB具有在环境发生改变时做出快速反应的能力,具体体现在AOB较NOB具有更高的活性恢复速率上。此外,好氧饥饿能够快速杀死丝状细菌,迅速改善膨胀污泥的沉降性能,使污泥的SVI由170ml·g-1快速下降到30ml·g-1。胞外聚合物(extracellularpolymericsubstances,EPS)和溶解性微生物产物(solublemicrobialproducts,SMP)能够相互转化,并为饥饿污泥提供一定的碳源和能源,保证了细菌在饥饿环境中长期的细胞维持。

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