Wolters Kluwer - Medknow Wolters Kluwer India Pvt. Ltd. International Journal of Environmental Health Engineering (IJEHE) AWAITED 2021 August 2021 08 01 Determination the biochemical kinetics of natural and synthetic estrogens in moving bed Bioreactor 1 8 26314 10.4103/ijehe.ijehe_53_20 EN Zeynab Yavari Department of Environmental Health Engineering, School of Health; Genetic and Environmental Adventures Research Center, Abarkouh Paramedical School, Shahid Sadoughi University of Medical Sciences, Yazd, Iran 0000-0002-6146-7101 Farzaneh Mohammadi Department of Environmental Health Engineering, School of Health; Environment Research Center, Research Institute for Primordial Prevention of Non-communicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran 0000-0002-8248-3629 Mohammad Mehdi Amin Department of Environmental Health Engineering, School of Health; Environment Research Center, Research Institute for Primordial Prevention of Non-communicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran Journal Article 2023 01 17 <strong>Aim:</strong> Estrogenic compounds as a group of endocrine disruptive compounds can interfere with endocrine system beings. In the present work, an attempt has been made, to characterize the kinetic coefficients of natural and synthetic estrogens, in a pilot-scale moving bed biofilm bioreactor (MBBR). <strong>Materials</strong> <strong>and</strong> <strong>Methods:</strong> The substrate removal rates were investigated at different organic loading rates, and hydraulic retention times. By applying some biokinetic models including first order, second order, Stover–Kincannon, and the Monod equation, the kinetic constants (m, Ks, k, Y, and Kd) were determined. <strong>Results:</strong> Estrogen-specific removal rate was between 0.22 and 1.45 μg. g VSS-1.d-1 for natural and synthetic hormones. The experimental data showed that the Stover–Kincannon model and second-order model were the fit models and have high correlation coefficients more than 99%. <strong>Conclusion:</strong> These findings indicated that theses mathematical models could be promising models for effectively predicting kinetic parameters for performance of MBBR reactors. https://ijehe.mui.ac.ir/article_26314_2b21233ee86da3fbf0333f8c7d6439d0.pdf