Acid waste water purification process, involves, adding calcium carbonate and carbon dioxide, adding milk of lime, subjecting in reactor, and rapid decarbonisation process

摘要

Acid waste water is purified by addn. of CaCO3 and/or CaHCO3 and opt. CO2. The water is then, after addn. of milk of lime, subjected, in a reactor, to a rapid (conventional) decarbonisation process, followed by filtration using a gravel filter. Part of the water is channelled off before filtration, and passes via a cation exchanger to the waster water at the top of the reactor. Process and installation are economical to produce and maintain, and unwanted by - products are minimised.