... Purification of river water, lake water and underground water,industry water and industry recycling water. 2) Reclaiming coal from coal-washing ... the waste water in printing and dyeing industry, leather industry, brewage industry, meat-processing industry, coal-washing, metallurgy industry, mine, pharmacy, paper-making, and ... moulding,Refining of pharmaceuticals, glycerine and sugar,Paper-making glue.