Water purification system and method

Details Water purification system and method Water purification system and method

1995-12-13

1997-07-29

Fortuna, Ana

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210641, 210651, 210654, 210638, 210912, B01D 6300

Patent

active

056518943

ABSTRACT:
An ultrapure water purification scheme that incorporates the use of certain RO filtration membranes that are especially susceptible to oxidative attack employs the combination reducing/metals scavenger/biocidal agent dithiocarbamate as a pretreatment additive to maintain a non-oxidizing environment, to bind contaminant metals to improve their removal from source water, and to reduce microbial content. In addition, the generation of oxidants by cavitation effects is avoided by a reduced pressure retentate recycle. Both measures prevent oxidative attack and fouling of the RO membranes.

REFERENCES:
patent: 4824574 (1989-04-01), Cadotte et al.
patent: 5152901 (1992-10-01), Hodgdon
patent: 5207916 (1993-05-01), Goheen et al.
patent: 5238574 (1993-08-01), Kawashima et al.
patent: 5277817 (1994-01-01), Martyak et al.
patent: 5403490 (1995-04-01), Desai

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