A novel agitation method using ozone was applied to removing BOD 5 , COD Mn , color, and NH 4 -N in organic waste water filled in a cylindrical vessel. The organic waste water was agitated by injecting the same organic waste water into the bath through a centered bottom nozzle. Its flow rate was adjusted to form a jet above the nozzle. A pump was used for draining the organic waster water through four nozzles settled on the bottom of the vessel and circulating it until the aforementioned four quantities were sufficiently decreased. The swirl motion of the jet appeared under certain injection conditions. The bath was strongly agitated in the presence of the swirl motion. An ozone and air mixture therefore was supplied into the nozzle and then introduced into the bath with the jet. The rate constants of BOD 5 , COD Mn , color, and NH 4 -N were highly enhanced by this method compared to the conventional method using aeration of an ozone-air mixture supplied through a perforated plate.
Experimental investigation was carried out on a swirl motion of a bottom blown bubbling jet in the presence of a top oil layer. Water was used as the lower liquid and silicone oil was used as the top oil. The kinematic viscosity of the silicone oil was changed over a wide range. The occurrence region of the swirl motion became narrow as the kinematic viscosity of the silicone oil, n o , increased. Silicone oil did not affect the period of swirl motion, T s . As n o increased, the starting time of the swirl motion, T s,s , increased, whereas the amplitude, A, and the damping time of the swirl motion, T s,d , decreased. An apparent kinematic viscosity, n app , was introduced for correlating A, T s,s and T s,d . Empirical equations were proposed for these quantities as functions of n app .
A novel agitation method using ozone was applied to removing BOD 5 , COD Mn , color, and NH 4 _ N in organic waste water filled in a cylindrical vessel. The organic waste water was agitated by injecting the same organic waste water into the bath through a centered bottom nozzle. Its flow rate was adjusted to form a jet above the nozzle. A pump was used for draining the organic waste water through four nozzles settled on the bottom of the vessel and circulating it until the aforementioned four quantities were sufficiently decreased. The swirl motion of the jet appeared under certain injection conditions. The bath was strongly agitated in the presence of the swirl motion. An ozone and air mixture therefore was supplied into the nozzle and then introduced into the bath with the jet. The rate constants of BOD 5 , COD Mn , color, and NH 4 _ N were highly enhanced by this method compared to the conventional method using aeration of an ozone_ air mixture supplied through a perforated plate.
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