Reverse osmosis treatment of battery waste

Details Reverse osmosis treatment of battery waste Reverse osmosis treatment of battery waste

1977-01-07

1977-09-06

Bascomb, Jr., Wilbur L.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 42R, 210 57, B01D 1300

Patent

active

040466868

ABSTRACT:
Reverse osmosis is made usable for removal of heavy metals from acid battery waste by a process in which dissolved calcium sulphate, produced by neutralization with lime, is sequestered by sodium hexametaphosphate before introduction into the permeator. The concentrated waste from the permeator is then used as a diluent for the neutralizing lime. The neutralizing lime causes the hexametaphosphate to revert to orthophosphate, whereupon calcium phosphate, and calcium sulphate are precipitated and removed.

REFERENCES:
patent: 2304791 (1942-12-01), Bell
patent: 3476689 (1969-11-01), Newman
patent: 3580855 (1971-05-01), Mickus et al.
patent: 3795609 (1974-03-01), Hill et al.

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