کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8873795 | 1623027 | 2018 | 35 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Deterministic mechanisms define the long-term anaerobic digestion microbiome and its functionality regardless of the initial microbial community
ترجمه فارسی عنوان
مکانیزمهای تعیین کننده، میکروبیوم هضم بی هوازی طولانی مدت و قابلیت آن بدون در نظر گرفتن جامعه اولیه
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کلمات کلیدی
هضم بی هوازی جامعه میکروبی، هسته جامعه، تست فعالیت سینتیک، همبستگی،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
چکیده انگلیسی
The impact of the starting inoculum on long-term anaerobic digestion performance, process functionality and microbial community composition remains unclear. To understand the impact of starting inoculum, active microbial communities from four different full-scale anaerobic digesters were each used to inoculate four continuous lab-scale anaerobic digesters, which were operated identically for 295 days. Digesters were operated at 15 days solid retention time, an organic loading rate of 1â¯g COD Lrâ1 dâ1 (75:25 - cellulose:casein) and 37â¯Â°C. Results showed that long-term process performance, metabolic rates (hydrolytic, acetogenic, and methanogenic) and microbial community are independent of the inoculum source. Digesters process performance converged after 80 days, while metabolic rates and microbial communities converged after 120-145 days. The convergence of the different microbial communities towards a core-community proves that the deterministic factors (process operational conditions) were a stronger driver than the initial microbial community composition. Indeed, the core-community represented 72% of the relative abundance among the four digesters. Moreover, a number of positive correlations were observed between higher metabolic rates and the relative abundance of specific microbial groups. These correlations showed that both substrate consumers and suppliers trigger higher metabolic rates, expanding the knowledge of the nexus between microorganisms and functionality. Overall, these results support that deterministic factors control microbial communities in bioreactors independently of the inoculum source. Hence, it seems plausible that a desired microbial composition and functionality can be achieved by tuning process operational conditions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 141, 15 September 2018, Pages 366-376
Journal: Water Research - Volume 141, 15 September 2018, Pages 366-376
نویسندگان
M. Peces, S. Astals, P.D. Jensen, W.P. Clarke,