Effect of the Initial PH on the Anaerobic Digestion Process of Dairy Cattle Manure

Overview

Journal AMB Express

Date 2022 Dec 28

PMID 36576594

Authors

Job Jonathan Castro-Ramos

Aida Solis-Oba

Myrna Solis-Oba

Carlos Ligne Calderon-Vazquez

Jesus Mireya Higuera-Rubio

Rigoberto Castro-Rivera

Affiliations

Soon will be listed here.

Abstract

Anaerobic digestion (AD) has recently been studied to obtain products of greater interest than biogas, such as volatile fatty acids (VFAs) and phytoregulators. The effect of the initial pH of cow manure and the fermentation time of the AD on the microbial composition, VFAs, indole-3-acetic acid (IAA) and gibberellic acid (GA) production was evaluated. The cow manure (7% solids) was adjusted to initial pH values of 5.5, 6.5, 7.5, and 8.5, and the AD products were analyzed every four days until day 20. The initial pH and the fermentation time had an important effect on the production of metabolites. During AD, only the hydrolytic and acidogenic stages were identified, and the bacteria found were from the phyla Firmicutes, Bacteroidetes, Actinobacteria, and Spirochaetes. The most abundant genera produced in the four AD were Caproiciproducens, Clostridium sensu stricto 1, Romboutsia, Paeniclostridium, Turicibacter, Peptostreptococcaceae, Ruminococcaceae and Fonticella. The highest amount of VFAs was obtained at pH 8.5, and the production of the acids was butyric > acetic > propionic. The maximum production of GA and IAA was at an initial pH of 6.5 on day 20 and a pH of 5.5 on day 4, respectively. There was a strong correlation (> 0.8) between the most abundant microorganisms and the production of VFAs and GA. The anaerobic digestion of cow manure is a good alternative for the production of VFAs, GA and IAA.

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