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Potential impact of process parameters upon the bacterial diversity in the mesophilic anaerobic digestion of beet silage.

Abstract：

:The impact of the process parameters hydraulic retention time (HRT), organic loading rate (OLR) and substrate upon bacterial diversity was analyzed. Therefore, a controlled anaerobic fermentation (1755 days) of beet silage, only initially inoculated with manure, was monitored by the amplified "ribosomal DNA" restriction analysis. More than 85% of detected operational taxonomic units (OTUs) could not be assigned to described Bacteria. In contrast to studies analyzing the digestion of energy crops in the presence of manure, Chloroflexi were detected, whereas Clostridia and Chloroflexi were identified as persistent groups. Both groups are known as potential hydrogen producers or users. Species distribution patterns for Firmicutes, Bacteroidetes, Synergistetes and Thermotogae were not clearly linked to process parameters. The presence of Planctomycetes, Actinobacteria and Alcaligenaceae was related to long HRTs and short OLRs, while Acidobacteria were governed by short HRTs and high OLRs, respectively. The impact of substrate variations on diversity was minute.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Krakat N,Schmidt S,Scherer P

doi

10.1016/j.biortech.2011.02.108

subject

Has Abstract

pub_date

2011-05-01 00:00:00

pages

5692-701

issue

10

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(11)00314-2

journal_volume

102

pub_type

杂志文章

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