US EPA

4829143 

Technical Report 

[Waste water treatment by gas intake apparatus] 

Fujie, K; Okawa, T; Sakai, N 

1975 

The Society of Chemical Engineers 

Japan 

305-306 

Japanese 

waste water treatment by ozone was studied using a gas intake apparatus in which the waste water is recirculated in the reaction bath and ozone is dissolved into the waste water during the recirculation period. Waste water containing 100 ppm cyanide ion was treated with 3.1 liters of ozone gas. with water circulation rates of 65 liters/min and 55 liters/min, a higher cyanide efficiency was obtained by the second rate. The cyanide concentration after 20 min of treatment was 40 percent of the initial cyanide concentration with the water circulation rate at 65 liters/min, while it was 20 percent with the circulation rate at 55 liters/min. with the faster circulation rate, more than 90 percent of the cyanide could be removed within 30 min. When the water containing 17.4 ppm dibutyl sebacate was treated with ozone, nearly 80 percent of the initial dibutyl sebacate was removed after 20 min of treatment with water circulation rates of 40 liters/min and 50 liters/min. Ozone absorption into water and the decomposition of dissolved ozone were studied using drinking water. A first-order reaction was found in the decomposition of dissolved ozone, and the decomposition reaction rate increased with increased water temperature. The adsorption of ozone by water was quite high, which is desirable because then only a small amount of non-absorbed ozone will be discharged. (Katayama-firl) 

waste water treatment; industrial wastes; ozone; chemical wastes; water treatment; potable water; recycling; cyanide ions; dibutyl sebacate