Grease Trap, Dewatering and Disposal

The previous method of commercial kitchen grease waste disposal has now been banned by the Australian government. 

We are trying to come up with a method to trap grease waste.

We are considering using geotextile bags to dewater and store the grease waste. I personally don't believe it will work since the inside of the bags has a layer of FOG (fats, oil, grease), which prevents dewatering. Moreover, space for disposal of the bags is very limited. 

Does anyone have suggestions on how to make a grease trap and separate the grease from water?