Humic acid inhibition of hydrolysis and methanogenesis with different anaerobic inocula

Article

Yap, S. D., Astals, S., Lu, Y., Peces, M., Jensen, P. D., Batstone, D. J. and Tait, S.. 2018. "Humic acid inhibition of hydrolysis and methanogenesis with different anaerobic inocula." Waste Management. 80, pp. 130-136. https://doi.org/10.1016/j.wasman.2018.09.001
Article Title

Humic acid inhibition of hydrolysis and methanogenesis with different anaerobic inocula

ERA Journal ID4691
Article CategoryArticle
AuthorsYap, S. D. (Author), Astals, S. (Author), Lu, Y. (Author), Peces, M. (Author), Jensen, P. D. (Author), Batstone, D. J. (Author) and Tait, S. (Author)
Journal TitleWaste Management
Journal Citation80, pp. 130-136
Number of Pages7
Year2018
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN0956-053X
Digital Object Identifier (DOI)https://doi.org/10.1016/j.wasman.2018.09.001
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0956053X18305427?via%3Dihub#!
Abstract

There is increasing evidence that humic acid (HA) is hampering the performance of anaerobic digesters treating animal manures and thermally-hydrolysed waste activated sludge. In the present study, HA inhibition and inhibition resilience was examined for hydrolysis (carbohydrate and protein) and acetotrophic methanogenesis with four distinct full-scale anaerobic inocula. The aim was to further understand HA inhibition and to explore potential relationships between microbial factors and inhibition resilience. For two of the four tested inocula, cellulose degradation showed a start-up delay that lengthened as HA concentration increased from 0 to 2 g L−1. This inhibition was reversible because, after the initial delay, subsequent hydrolysis rates and methane yields were not significantly influenced by HA concentration. Cellulose hydrolysis results at HA concentrations below 2 g L−1 support a threshold inhibition mechanism, i.e. HA complexes with hydrolytic enzymes preventing them from binding with cellulose, but once all the HA had been complexed, enzymes subsequently released are free to bind with cellulose. Inocula with higher cellulose hydrolytic activity were less affected by HA inhibition, suggesting a potential link between HA inhibition resilience and microbial activity. However, above 5 gHA L−1, cellulose hydrolysis rates decreased with increasing HA concentration; indicating that the mechanisms of inhibition may change depending on some threshold HA concentration. Protein hydrolysis and acetotrophic methanogenesis were less susceptible to HA inhibition than cellulose hydrolysis, since signs of inhibition were only observed above 5 gHA L−1. Acetotrophic methanogenesis was partially inhibited at 10 gHA L−1 and completely inhibited at 20 gHA L−1. These results further support that HA inhibition is selective towards particular enzymes.

Keywordsanaerobic digestion; humic acid; inhibition; hydrolysis; methanogenesis; microbial community
ANZSRC Field of Research 2020401102. Environmentally sustainable engineering
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Byline AffiliationsUniversity of Queensland
Institution of OriginUniversity of Southern Queensland
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