US 7,320,759 B2 | ||
Sludge treatment method | ||
Nozomu Yasunaga, Tokyo (Japan); Toshiyuki Kamiya, Tokyo (Japan); Naoki Nakatsugawa, Tokyo (Japan); and Junji Hirotsuji, Tokyo (Japan) | ||
Assigned to Mitsubishi Denki Kabushiki Kaisha, Tokyo (Japan) | ||
Filed on Nov. 13, 2006, as Appl. No. 11/559,006. | ||
Application 11/559006 is a division of application No. 10/961113, filed on Oct. 12, 2004. | ||
Claims priority of application No. 2004-002136 (JP), filed on Jan. 07, 2004; and application No. 2004-160048 (JP), filed on May 28, 2004. | ||
Prior Publication US 2007/0068876 A1, Mar. 29, 2007 | ||
Int. Cl. C02F 11/06 (2006.01); C02F 101/10 (2006.01) |
U.S. Cl. 210—712 [210/609; 210/718; 210/721; 210/760; 210/906] | 14 Claims |
1. A sludge treatment method, comprising the steps of:
foaming a sludge-containing liquid by blowing an ozone-containing gas into the sludge-containing liquid to generate sludge-adsorbed
bubbles and discharge the bubbles from a bubble discharge port provided in an upper portion of an ozone treatment vessel,
wherein the ozone-containing gas is blown into the sludge-containing liquid during the foaming step using a diffuser pipe
provided at the bottom of the ozone treatment vessel, and wherein the foaming step further includes mixing the sludge-containing
liquid and the bubbles using a bubble mixing blade provided at an upper portion of the ozone treatment vessel and a liquid
mixing blade provided at a lower portion of the ozone treatment vessel;
eluting phosphorus in the sludge-containing liquid by supplying the bubbles to a phosphorous elution vessel from the bubble
discharge port thereby bringing sludge adsorbed on the bubbles and a sludge-dissolving agent into contact with each other
within the phosphorous elution vessel; and
decomposing waste ozone gas not dissolved in the sludge-containing liquid into oxygen, wherein the waste ozone gas is received
from an upper portion of the phosphorous elution vessel.
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