Biogas from Tannery Solid Waste Anaerobic Digestion Is Driven by the Association of the Bacterial Order Bacteroidales an
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Biogas from Tannery Solid Waste Anaerobic Digestion Is Driven by the Association of the Bacterial Order Bacteroidales and Archaeal Family Methanosaetaceae Caroline Borges Agustini 1
2
& Marisa da Costa & Mariliz Gutterres
1
Received: 28 January 2020 / Accepted: 23 April 2020/ # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract
The search for renewable energies has been one of the biggest challenges of the last decades. Sludge and solid wastes of many sources have been used to produce biogas of high calorific value. Thus, this work aimed to evaluate the biogas production of solid waste originating from a tannery that uses chromium salts as a tanning agent and to characterize the physicochemical parameters and microbial composition of the biogasproducing biomass. Wastes were collected and the parameters were evaluated at the initial and final time points of the anaerobic incubation process. At the end of 150 days, there was a production of 26.1 mL g−1 VSS of biogas with 52% of methane. The highest amount of biomethane observed was related to the archaeal family Methanosaetaceae and bacterial order Bacteroidales. Knowledge about changes in the microbial composition can provide tools for manipulation, isolation, and inoculation of the microorganisms inside the bioreactors to maximize methane production. Keywords Tannery solid wastes . Anaerobic treatment . Biogas . Biomass characteristics . Prokaryotic community
Highlights • Anaerobic digestion of tannery solid waste results in a high calorific biogas value. • Microbiota changes throughout process of the incubation period of the anaerobic digestion. • Physicochemical parameters such TOC influence the composition of the microbial community after the anaerobic digestion. • Bacterial order Bacteroidales and archaeal family Methanosaetaceae are related with high calorific value biogas production.
* Caroline Borges Agustini [email protected] Mariliz Gutterres [email protected] Extended author information available on the last page of the article
Applied Biochemistry and Biotechnology
Introduction Anaerobic digestion (AD) is the biological treatment of organic waste and wastewater without the input of oxygen in the reaction. This process has the potential to reduce the cost of waste treatment and produce biogas from organic waste [1]. Biogas primarily consists of methane (CH4) in a range of 50–70% and carbon dioxide (CO2) at a concentration of 30–50% and traces of other gases. However, the relative content of CH4 and CO2 in a produced biogas is mainly dependent on the nature of the substrate [2]. Biogas production represents a more efficient and useful alternative to fossil-based energy production because of its economic way of producing methane if compared to other technologies [3]. Solid tanning wastes are protein rich because they derive from animal hide. Besides, the high organic load and the poorly biodegradable compounds added in the tanning process [4]. The main solid residues are leather shavings and hide [5] and the sludge
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