Coal and coal mine drainage.
D003032:Coal Mining; D005615:Freezing; D005898:Glass; D007220:Industrial Waste; D007474:Ion Exchange; D008722:Methods; D009995:Osmosis; D012498:Sanitary Engineering; D012822:Silicon Dioxide; D014876:Water Pollution; D014877:Water Pollution, Chemical
D007220:Industrial Waste; D012822:Silicon Dioxide