Method for recovery of heavy metals from highly concentrated was

Details Method for recovery of heavy metals from highly concentrated was Method for recovery of heavy metals from highly concentrated was

1990-04-30

1991-05-28

Silverman, Stanley

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210912, 210726, 210772, 75726, 75731, 204149, 204DIG13, C02F 162, C02F 170

Patent

active

050192736

ABSTRACT:
Heavy metals are reclaimed from a concentrated wastewater solution containing heavy metal cations and an acid by adding to the wastewater a bed of scrap aluminum in a total amount between about 160% and about 180% of the stoichiometric requirement for complete reduction of the dissolved heavy metal cations to their elemental states and adjusting the acid content of the wastewater to 5% to 20% by volume and allowing the heavy metal cations to react with the scrap aluminum to oxidize the aluminum and to reduce the heavy metal cations to their elemental states thereby producing demetallized wastewater which is neutralized with caustic to produce a treated effluent.

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