A kinetic study on carboxylic acids production using bovine slaughterhouse wastewater: a promising substrate for resourc
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RESEARCH PAPER
A kinetic study on carboxylic acids production using bovine slaughterhouse wastewater: a promising substrate for resource recovery in biotechnological processes Naassom Wagner Sales Morais1 · Milena Maciel Holanda Coelho2 · Tasso Jorge Tavares Ferreira1 · Erlon Lopes Pereira1 · Renato Carrhá Leitão3 · André Bezerra dos Santos1 Received: 3 May 2020 / Accepted: 28 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Carboxylic acids (CA) are considered high added-value compounds, and their production from wastes has gained economic and environmental notoriety. However, the CA production and kinetic modeling using some agro-industrial wastewaters, such as bovine slaughterhouse wastewater (SHW), are not well reported in the literature. Therefore, the objective of this work was to evaluate the CA production potential using SHW as a substrate under acidogenic conditions and to apply mathematical models to estimate the kinetic parameters of particulate organic matter hydrolysis, soluble organic matter consumption, and CA production. Tests were carried out in quadruplicate batch reactors with a 250-mL reaction volume, with brewery sludge as inoculum and using chloroform (0.05%, v/v) for methanogenesis inhibition. The obtained yield was 0.55 g acids gCODA−1, corresponding to 0.76 gCOD g CODA−1. The production of caproic acid without the addition of electron donors was achieved. Mathematical models that describe exponential growth, such as the first-order exponential model, cone model, and Fitzhugh model, were the most suitable to describe the production kinetics of CA. Finally, SHW seems to be a promising substrate to be investigated in the carboxylic platform. Keywords Carboxylic acids · Slaughterhouse wastewater · Kinetic modeling · Biotechnological processes
Introduction Carboxylic acids (CA) are building block chemicals widely applied to the industry to varnishes, paints, perfumes, disinfectants, surfactants, textile auxiliaries, drugs, and food products production [1]. Traditionally, these acids are synthesized from the oxidation or carboxylation of chemical Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00449-020-02440-3) contains supplementary material, which is available to authorized users. * André Bezerra dos Santos [email protected] 1
Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Campus do Pici, Bloco 713, Pici, Fortaleza, Ceará 60455‑900, Brazil
2
School of Chemistry, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro 21941‑909, Brazil
3
Embrapa Agroindústria Tropical, Rua Dra. Sara Mesquita, 2270, Fortaleza, Ceará 60511‑110, Brazil
precursors derived from petroleum processing, generating the emission of greenhouse gases (GHG), which cause serious environmental and human health problems [2]. GHG emissions over the entire acetic acid (HAc) life cycle (cradle-to-grave) are estimated to be 3.3 ton CO2eq ton−1 HAc in cases where the production proc
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