Method of purifying waste water

Details Method of purifying waste water Method of purifying waste water

1981-03-10

1983-08-02

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

Water purification only

203 36, 203 96, 203 98, 202158, 210750, 423356, C02F 104

Patent

active

043964630

ABSTRACT:
A method of purifying waste water, for example waste water from a coking plant, comprises supplying waste water to be purified to the upper part of a stripping column comprising a plurality of substantially horizontal plates disposed above one another, supplying vapor to the lower part of the column, and supplying a strong base to the column laterally at one or more levels, wherein the water to be stripped is passed downwardly from the top of the column across a number of successive plates sufficient to permit the pH of the water to decrease to a value below 7, and wherein the base is supplied at a level or levels lower than that at which the pH has decreased to the above value.

REFERENCES:
patent: 1928510 (1933-09-01), Sperr
patent: 2088817 (1937-08-01), Shoeld
patent: 2581881 (1952-01-01), Pyle et al.
patent: 2635073 (1953-04-01), McIntire et al.
patent: 2767967 (1956-10-01), Hutchinson
patent: 3278423 (1966-10-01), Millar
patent: 4104131 (1978-08-01), Didycz et al.
patent: 4108735 (1978-08-01), Burcaw et al.
patent: 4160725 (1979-07-01), Josis et al.

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