Hi,
I have done my Ph.D. in Chemical engineering and have over 6 years of experience in using MATLAB and Simulink. I have direct experience in EKF implementation for estimating GHG emissions from a biological reactor. You may like to read my paper (Behera, C.R., Srinivasan, B., Chandran, K. and Venkatasubramanian, V., 2015. Model-based predictive control for energy efficient biological nitrification process with minimal nitrous oxide production. Chemical Engineering Journal, 268, pp.300-310.).
Kind regards,
Chitta