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Microb Ecol. 2015 Nov;70(4):948-60. doi: 10.1007/s00248-015-0635-2. Epub 2015 Jun 5.

Effect of the Organic Loading Rate Increase and the Presence of Zeolite on Microbial Community Composition and Process Stability During Anaerobic Digestion of Chicken Wastes.

Author information

1
Department of Microbiology, Kazan (Volga Region) Federal University, Kazan, 420008, The Republic of Tatarstan, Russia.
2
Department of Technologies, A. E. Arbuzov Institute of Organic and Physical Chemistry, Russian Academy of Sciences, Kazan, 420088, The Republic of Tatarstan, Russia.
3
Laboratory of Omics Technologies, Kazan (Volga Region) Federal University, Kazan, 420008, The Republic of Tatarstan, Russia.
4
Department of Microbiology, Kazan (Volga Region) Federal University, Kazan, 420008, The Republic of Tatarstan, Russia. a.ziganshin06@fulbrightmail.org.

Abstract

This study investigates the effect of the organic loading rate (OLR) increase from 1.0 to 3.5 g VS L(-1) day(-1) at constant hydraulic retention time (HRT) of 35 days on anaerobic reactors' performance and microbial diversity during mesophilic anaerobic digestion of ammonium-rich chicken wastes in the absence/presence of zeolite. The effects of anaerobic process parameters on microbial community structure and dynamics were evaluated using a 16S ribosomal RNA gene-based pyrosequencing approach. Maximum 12 % of the total ammonia nitrogen (TAN) was efficiently removed by zeolite in the fixed zeolite reactor (day 87). In addition, volatile fatty acids (VFA) in the fixed zeolite reactor accumulated in lower concentrations at high OLR of 3.2-3.5 g VS L(-1) day(-1). Microbial communities in the fixed zeolite reactor and reactor without zeolite were dominated by various members of Bacteroidales and Methanobacterium sp. at moderate TAN and VFA levels. The increase of the OLR accompanied by TAN and VFA accumulation and increase in pH led to the predominance of representatives of the family Erysipelotrichaceae and genera Clostridium and Methanosarcina. Methanosarcina sp. reached relative abundances of 94 and 57 % in the fixed zeolite reactor and reactor without zeolite at the end of the experimental period, respectively. In addition, the diminution of Synergistaceae and Crenarchaeota and increase in the abundance of Acholeplasmataceae in parallel with the increase of TAN, VFA, and pH values were observed.

KEYWORDS:

Ammonia inhibition; Biogas; Microbial diversity; Organic loading rate; Pyrosequencing; Zeolite

PMID:
26045158
DOI:
10.1007/s00248-015-0635-2
[Indexed for MEDLINE]

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