Disinfection of bedding material in poultry

In all kind of Poultry, if the birds are kept on floor, bedding material is used. It includes wood shaving, wheat straw and rice hulls etc etc.... In some countries like USA sterilized bedding material is available but most of the countries it is not available. In Pakistan mostly rice hulls are used as bedding material in poultry houses and it is severe threat for poultry if it is not disinfected properly. When new flock is placed a very big quantity of rice hulls are used as new litter. Please suggest how we can disinfect it properly when it is used in bulk quantity ?