Mibitrans: A python package for modelling subsurface contaminant transport and natural attenuation decision support

Bioremediation is a promising strategy for sustainable management and treatment of field sites with soil and groundwater contamination. Understanding the fate of contaminants is key for identifying optimal conditions and prediction of biodegradation in the subsurface. We develop the open-source Python package mibitrans for hydrogeological reactive transport modelling for simple use of field site modelling, transport prediction and management optimization. Mibitrans is developed in the frame of the EU-funded MiBiRem project.Mibitrans is based on physics-based (semi-)analytical solutions for multidimensional solute transport in groundwater. Biodegradation can be modelled in various ways, including simple first-order decay and chemical reactions based on electron acceptor concentrations. The mibitrans package is modular, fully tested, well documented and well-structured to allow for easy adaptation and use in various field situations. We will present the use with example field site data from ongoing bioremediation projects.