Effect of the initial pH on the anaerobic digestion process of dairy cattle manure

AMB Express

Original Article

Carlos Ligne Calderón-Vázquez¹  Jesús Mireya Higuera-Rubio¹  Job Jonathan Castro-Ramos²  Rigoberto Castro-Rivera²  Myrna Solís-Oba²  Aida Solís-Oba³ 

[1] Instituto Politécnico Nacional, CIIDIR Unidad Sinaloa, 81100, Guasave, Sinaloa, Mexico;Instituto Politécnico Nacional, Centro de Investigación en Biotecnologia Aplicada, 90700, Tepetitla de Lardizábal, Tlaxcala, Mexico;Universidad Autónoma Metropolitana, Unidad Xochimilco, Ciudad de Mexico, Mexico;

关键词: Volatile fatty acids;    Indole-3-acetic acid;    Gibberellic acid;    Anaerobic digestion;    Cow manure;   

DOI  :  10.1186/s13568-022-01486-8

 received in 2022-07-06, accepted in 2022-11-01,  发布年份 2022

来源: Springer

【 摘 要 】

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 (GA3) 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 GA3 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 GA3. The anaerobic digestion of cow manure is a good alternative for the production of VFAs, GA3 and IAA.

【 授权许可】

CC BY   
© The Author(s) 2022

【 图 表 】

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