Activated Charcoal Uses:
Air filters in gas masks, filter masks, air compressors.
Food coloring
Gas purification
Gold purification
Medicine: liver and kidney dialysis machines, laser surgery, breast cancer surgery, stomach decontamination from drug/food poisoning, wound dressing...
Metal extraction
Metal finishing - the purification of electroplating solutions, as in bright nickel-plating solutions.
Nuclear Biological Chemical (NBC) suits
Nuclear power plants
Recycling solvents
Rye grass seed industry
Sewage treatment
Snow avalanche control - helping to melt snow
Soil enhancement
Sound systems - "cleaning" out bad background noise
Toxic soil cleanup from chemical spills or accumulation of chemical spraying
Volatile organic compounds capture: from painting, dry cleaning, gasoline dispensing operations, and other processes.
Water purification: aquariums, swimming pools, domestic & municipal water systems, recycling precious water on the orbiting space station (cost $10,000/liter)