Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1996-12-09
1998-11-24
Hruskoci, Peter A.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210713, 210721, 210724, 210726, 210911, C02F 158
Patent
active
058401946
ABSTRACT:
The present invention provides a process for treating arsenic-containing waste water, comprising adding an oxidizing agent, if necessary, to arsenic-containing waste water to oxidize trivalent arsenic in the waste water into pentavalent arsenic; adding a calcium compound to adjust the pH to 12 or higher; separating it into solid and liquid (first solid/liquid separation); calcining the resulting sludge, while adding a ferric salt to the treated solution to adjust the pH to 6-9 after the solid/liquid separation; and separating it into solid and liquid (second solid/liquid separation). According to the present invention, it is possible to remove arsenic from waste water efficiently to yield treated water satisfying various tolerance limits under various regulations, while the arsenic-containing sludge separated from the waste water can become harmless in subsequent continuous steps.
REFERENCES:
patent: 4201667 (1980-05-01), Liao
patent: 4566975 (1986-01-01), Allgulin
patent: 5093007 (1992-03-01), Domvile
patent: 5618439 (1997-04-01), Allgulin
patent: 5651895 (1997-07-01), Gordon
Baba Hiroshi
Fujita Hiroshi
Kamiyoshi Hideki
Shikai Ranko
Tao Koosoo
Hruskoci Peter A.
Mitsubishi Jukogyo Kabushiki Kaisha
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