Recycling at U海角社区 The University of 海角社区 uses the Casella Zero-Sort recycling system. Zero-Sort recycling means that all recyclable materials can be placed in a blue recycling bin, and all non-recyclable waste can be placed in a grey trash bin. Blue Bin = Zero Sort Recycling Grey Bin = Trash Recyclable Materials Include: PLASTICS #1-7 (check