Anaerobic bioreactor landfills are a popular way to treat trash, making it break down faster and produce less harmful liquid waste. By recirculating this liquid waste, the landfill can clean it up and prevent pollution. The type of trash, how easily it breaks down, and how much liquid passes through it affect the amount of harmful substances in the waste. Recirculating the liquid waste in a bioreactor helps break down the trash efficiently and make it safer.