  In this paper, we focus on the Keller-Segel chemotaxis system in a random
heterogeneous domain. We assume that the corresponding diffusion and chemotaxis
coefficients are given by stationary ergodic random fields and apply stochastic
two-scale convergence methods to derive the homogenized macroscopic equations.
In establishing our results, we also derive a priori estimates for the
Keller-Segel system that rely only on the boundedness of the coefficients; in
particular, no differentiability assumption on the diffusion and chemotaxis
coefficients for the chemotactic species is required. Finally, we prove the
convergence of a periodization procedure for approximating the homogenized
macroscopic coefficients.
