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Bacterial community progression during food waste composting containing high dioctyl terephthalate (DOTP) concentration
Chemosphere ( IF 8.8 ) Pub Date : 2020-11-23 , DOI: 10.1016/j.chemosphere.2020.129064
Huu Tuan Tran , Chitsan Lin , Xuan Thanh Bui , Tomoaki Itayama , Bao Trong Dang , Nicholas Kiprotich Cheruiyot , Hong Giang Hoang , Chi Thanh Vu

The overall dioctyl terephthalate (DOTP) degradation efficiency during food waste composting was 98%. The thermophilic phases contributed to 76% of the overall degradation efficiency, followed by the maturation phase (22%), then the mesophilic phase (0.7%). The thermophilic phase had the highest specific degradation rate of 0.149 d-1. The progression of the bacterial community during the composting process was investigated to understand DOTP biodegradation. The results showed that the bacterial richness and the alpha diversity of the DOTP composting were similar to a typical composting process, indicating that the high concentration of DOTP did not hinder the thriving and evolution of the bacterial community. Additionally, Firmicutes was the most dominant at the phylum level, followed by Proteobacteria and Bacteroidetes. Bacilli was the most dominant class (70%) in the mesophilic phase, with the abundance decreasing thereafter in the thermophilic and maturation phase. Moreover, Lactobacillus sp. was the dominant species at the beginning of the experiment, which was probably responsible for DOTP biodegradation. The high removal efficiency observed in the maturation phase indicates that degradation occurs in all the composting phases, and that compost can be used to enhance natural attenuation. These findings provide a better understanding of the bacterial communities during biodegradation of DOTP and plasticizers via food waste composting and should facilitate the development of appropriate green bioremediation technologies.



中文翻译:

含高对苯二甲酸二辛酯(DOTP)的食物垃圾堆肥过程中细菌群落的进展

食物垃圾堆肥期间总的对苯二甲酸二辛酯(DOTP)降解效率为98%。嗜热相占总降解效率的76%,其次是成熟相(22%),然后是嗜温相(0.7%)。嗜热相的比降解率最高,为0.149 d -1。调查了堆肥过程中细菌群落的进程,以了解DOTP的生物降解。结果表明,DOTP堆肥的细菌丰富度和α多样性与典型的堆肥过程相似,表明DOTP的高浓度不会阻碍细菌群落的繁衍和进化。此外,坚定在门类水平上是最主要的,其次是变形杆菌拟杆菌。在嗜温阶段,芽孢杆菌是最主要的类别(70%),此后在嗜热和成熟阶段,丰度降低。此外,乳酸杆菌sp。是实验开始时的优势种,可能是DOTP生物降解的原因。在成熟阶段观察到的高去除效率表明降解在所有堆肥阶段均发生,并且堆肥可用于增强自然衰减。这些发现为通过食物垃圾堆肥对DOTP和增塑剂进行生物降解过程中的细菌群落提供了更好的理解,并应有助于开发适当的绿色生物修复技术。

更新日期:2020-11-23
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