  We investigate the mixing properties of solutions to the stochastic transport
equation $d u= \circ d W \cdot\nabla u$, where the driving noise $W(t,x)$ is
white in time, colored and divergence-free in space. Furthermore, we prove the
dissipation enhancement in the presence of a small viscous term. Applying our
results, we also derive the mixing properties for a regularized stochastic 2D
Euler equation.
