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Semi-starvation fluctuation driving rapid partial denitrification granular sludge cultivation in situ by microorganism exudate metabolites feedbacks
Environmental Research ( IF 7.7 ) Pub Date : 2021-02-26 , DOI: 10.1016/j.envres.2021.110938
Jiuzhou Qian , Yi Han , Jianbo Guo , Jianbing Zhang , Yanan Hou , Yuanyuan Song , Caicai Lu , Haibo Li

In this study, semi-starvation fluctuation driving PD granules cultivation in situ by microorganism exudate metabolites feedbacks was firstly investigated. The PD granules of high nitrite production were cultivated with an excellent mean nitrate-to-nitrite transformation rate (NTR) of 56.39% in just 30 days. The granules size was improved from the initial size of 0.09 ± 0.01 mm in diameter to a size above 2 mm when the extracellular polymeric substance (EPS) content increased from 80.21 ± 10.20 mg/g MLVSS to 777.00 ± 22.13 mg/g MLVSS. Acyl-homoserine lactone signals (AHLs) ultimately increased ten-fold more than the initially through 30 days of cultivation. Meanwhile, Thauera had been identified as the main function bacteria of PD, which enriched from 0.47% to 10.67%. Results demonstrated that AHLs, EPS, PD bacteria and the PD granules cultivation were closely associated. Semi-starvation fluctuation produced oligotrophic stress on bacterial community, a part of bacteria would be eliminated on starvation for oligotrophic stress and AHLs of bacteria regarded as distress signals resulted in the rapid formation of PD granules. A mechanism for PD granular cultivation with semi-starvation fluctuation was proposed from the aspect of oligotrophic stress. A better strategy for rapid PD granules cultivation was obtained and it could be useful for the mainstream granule-based PD combined with the anammox process application in the future.



中文翻译:

半饥饿波动驱动微生物渗出物代谢物反馈快速原位反硝化颗粒污泥的原位培养

在这项研究中,首先研究了半饥饿波动驱动微生物分泌物代谢产物反馈原位培养PD颗粒。在短短30天内,以高的平均硝酸盐转化为亚硝酸盐转化率(NTR)达到56.39%的条件,培养了高亚硝酸盐产量的PD颗粒。当细胞外聚合物(EPS)含量从80.21±10.20 mg / g MLVSS增加到777.00±22.13 mg / g MLVSS时,颗粒尺寸从初始直径0.09±0.01 mm改善到2 mm以上。到开始培养30天,酰基高丝氨酸内酯信号(AHL)最终比最初增加了十倍。同时,Thauera被鉴定为PD的主要功能细菌,其含量从0.47%增至10.67%。结果表明,AHL,EPS,PD细菌和PD颗粒的培养密切相关。半饥饿波动对细菌群落产生寡营养胁迫,饥饿时将消除一部分细菌的寡营养胁迫,并且细菌的AHL被认为是遇险信号,导致PD颗粒的快速形成。从贫营养胁迫的角度出发,提出了一种半饥饿波动的PD颗粒培养机理。获得了一种更好的快速PD颗粒培养策略,并且该方法对于将来基于主流颗粒的PD结合厌氧氨氧化工艺的应用可能是有用的。

更新日期:2021-03-03
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