Modeling anaerobic digestion metabolic pathways for antibiotic-contaminated wastewater treatment
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ORIGINAL PAPER
Modeling anaerobic digestion metabolic pathways for antibiotic-contaminated wastewater treatment Rafael Frederico Fonseca Marcelo Zaiat
. Guilherme Henrique Duarte de Oliveira .
Received: 20 April 2020 / Accepted: 18 September 2020 Ó Springer Nature B.V. 2020
Abstract Anaerobic digestion has been used to treat antibiotic-contaminated wastewaters. However, it is not always effective, since biodegradation is the main removal mechanism and depends on the compound chemical characteristics and on how microbial metabolic pathways are affected by the reactor operational conditions and hydrodynamic characteristics. The aim of this study was to develop a mathematical model to describe 16 metabolic pathways of an anaerobic process treating sulfamethazine-contaminated wastewater. Contois kinetics and a useful reaction volume term were used to represent the biomass concentration impact on bed porosity in a N continuously stirred tank modeling approach. Two sulfamethazine removal hypotheses were evaluated: an apparent enzymatic reaction and a cometabolic degradation. Additionally, long-term modeling was developed to describe how the operational conditions affected the performance of the process. The best Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10532-020-09914-x) contains supplementary material, which is available to authorized users. R. F. Fonseca (&) G. H. D. de Oliveira M. Zaiat Biological Processes Laboratory, Center for Research, Development and Innovation in Environmental Engineering, Sa˜o Carlos School of Engineering (EESC), University of Sa˜o Paulo (USP), Engenharia Ambiental Bloco 4-F, Av. Joa˜o Dagnone, 1100 - Santa Angelina, Sa˜o Carlos, SP 13.563-120, Brazil e-mail: [email protected]
degradation correlations were associated with the consumption of carbohydrates, proteins and it was inversely related to acetic acid production during acidogenesis. Keywords Anaerobic digestion Methabolic pathways Long-term mathematical modelling Sulfamethazine degradation Operational conditions impacts List of symbols Xsu Carbohydrate degraders (gSSV g1 f Þ Proteins and amino acids degraders Xaa (gSSV g1 f Þ Xfa Fats degraders (gSSV g1 f Þ XC Citric acid degraders (gSSV g1 f Þ XM Malic acid degraders (gSSV g1 f Þ XFu Fumaric acid degraders (gSSV g1 f Þ XS Succinic acid degraders (gSSV g1 f Þ XF Formic acid degraders (gSSV g1 f Þ XP Propionic acid degraders (gSSV g1 f Þ XIb Isobutyric acid degraders (gSSV g1 f Þ XB Butyric acid degraders (gSSV g1 Þ f XIv Isovaleric acid degraders (gSSV g1 f Þ XV Valeric acid degraders (gSSV g1 Þ f XCp Caproic acid degraders (gSSV g1 f Þ 1 Xm Acetic acid degraders (gSSV gf Þ XT Total biomass (gSSV g1 f Þ
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Biodegradation
Smz gk Vr V Xr vs HRT Ysui Yaai i j KSX mgCOD gf 1 g1 SSV L Þ ks IP Kip KippVA kzj qik kEj kD E Ipsk Emzi;jk FCj FSj FVj hCj
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Sulfamethazine concentration (lgSMZ L1 Þ Complement of the
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