Fats, oil and grease should NEVER be put down the drain. It is not tolerated well in backyard compost either. FOG clogs up both systems.
You can convert FOG to biodiesel fuel at home too. Alternatively, conversion kits are available to enable your vehicle to run on straight vegetable oil (SVO). Do your homework before attempting either of these projects.
Other than that, FOG should be sealed up or absorbed and disposed with the trash. If it goes to SEMASS, at least it is burned to produce fossil-fuel free electricity.