Acid wastewater treatement

Details Acid wastewater treatement Acid wastewater treatement

1996-04-29

1997-07-08

Hruskoci, Peter A.

Liquid purification or separation

Processes

Ion exchange or selective sorption

210667, 210688, 210724, 210726, 210912, 405129, 588256, C02F 164

Patent

active

056457308

ABSTRACT:
A process for treating acid wastewater containing heavy metals has been invented, the process including adding fly ash to the acid wastewater to reduce heavy metals content of the acid wastewater. In one aspect the acid wastewater contains soluble iron and adding fly ash reduces the level of soluble iron. In one aspect the acid wastewater contains sulfate ions and adding fly ash reduces the sulfate ion level. In one aspect solid silicate salts are added to the acid wastewater. Preferably undesirable very hydrous iron hydroxide precipitate is not formed. In certain aspects the pH of the acid wastewater is raised to an environmentally acceptable level. In one aspect the process is a batch process. In another aspect the process is a continuous process.

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