Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1981-11-05
1982-12-28
Therkorn, Ernest G.
Liquid purification or separation
Processes
Ion exchange or selective sorption
210669, 210743, 210746, 210754, C02F 176
Patent
active
043660649
ABSTRACT:
Wastewater, particularly blowdown from a recycle gas-scrubbing and gas-cooling system of a blast furnace, is treated in a two-stage chlorination unit, the first stage including a chlorine addition at a pH of about 8.5 to about 10, preferably 9-9.5, and the second stage continuing the chlorination reaction at a pH of about 6 to about 8, preferably 7-7.5, while monitoring the oxidation-reduction potential of the second stage to utilize as a control point for chlorine addition in the first stage. Various contaminants, notably the nitrogen-containing compounds, are destroyed in the chlorination steps. A caustic or lime pretreatment is preferred for scale control at a pH of about 10.5 to about 11, preferably 10.7, while lime pretreatment is performed at a pH of about 9.6 to about 10, preferably 9.8. After chlorination, the process stream is preferably passed through activated carbon to remove organics.
REFERENCES:
patent: 3394080 (1968-07-01), Hoffman
patent: 3455820 (1969-07-01), Joyce
patent: 3732164 (1973-05-01), Pressley
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patent: 3760829 (1973-09-01), Schuk
patent: 3920419 (1975-11-01), Schroeder
patent: 4053403 (1977-10-01), Bachhofer
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patent: 4137166 (1979-01-01), Heimberger
Mihelic Edward L.
Schlosberg Samuel B.
Krayer William L.
Therkorn Ernest G.
United States Steel Corporation
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