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The single-species reaction-diffusion process $A+A\to O$ is examined in thepresence of an uncorrelated, quenched random velocity field. Utilising afield-theoretic approach, we find that in two dimensions and below the densitydecay is altered from the case of purely diffusing reactants. In two-dimensionsthe density amplitude is reduced in the presence of weak disorder, yielding theinteresting result that Sinai disorder can cause reactions to occur at an {\itincreased} rate. This is in contrast to the case of long-range correlateddisorder, where it was shown that the reaction becomes sub-diffusion limited.However, when written in terms of the microscopic diffusion constant it is seenthat increasing the disorder has the effect of reducing the rate of thereaction. Below two dimensions, the effect of Sinai disorder is much moresevere and the reaction is shown to become sub-diffusion limited. Althoughthere is no universal amplitude for the time-dependence of the density, it isuniversal when expressed in terms of the disorder-averaged diffusion length.The appropriate amplitude is calculated to one-loop order.Comment: 12 pages, 2 figure

The reaction process A + Arightarrow O in Sinai disorder