Method for waste treatment of organic strippers containing metal

Details Method for waste treatment of organic strippers containing metal Method for waste treatment of organic strippers containing metal

1992-12-17

1994-05-03

McCarthy, Neil M.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210912, 210908, C02F 152, C02F 162

Patent

active

053085027

ABSTRACT:
A method for treating liquid wastes containing photoresist polymers and heavy metals is disclosed. The method includes adding to the liquid wastes an aqueous solution of water soluble FE.sup.+3 and Al.sup.+3 salts at a pH in the range of from about 0.1 to 1.0, and a water soluble salt of Mg.sup.+2 or Ca.sup.+2. The ratio of the amount of the Fe.sup.+3 and Al.sup.+3 to the amount of the Mg.sup.+2 or Ca.sup.+2 is in the range of from 2 to 3 moles to 1 to 3 moles. A precipitate containing the heavy metals and photoresist polymers is formed.

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