Students should dispose of solid anhydrous sulfate, such as anhydrous sodium sulfate, by placing it in a designated, labeled waste container and then having it collected and disposed of by a licensed waste disposal contractor. It should not be poured down drains or sinks, as solid forms must use other disposal routes rather than sewer disposal systems

. Additionally, care should be taken to keep such solids away from drains, surface water, and groundwater to prevent contamination

. Laboratory protocols typically require solid chemical wastes to be handled through proper hazardous waste disposal channels rather than regular trash or drain disposal

. In summary:

• Sweep or vacuum the solid anhydrous sulfate carefully.
• Place it in a labeled waste container.
• Arrange for disposal through a licensed chemical waste contractor.
• Do not dispose of solid anhydrous sulfate down sinks or drains.

This ensures compliance with safety and environmental regulations and prevents pollution