Liquid purification or separation – With gas separator
Reexamination Certificate
2007-10-30
2007-10-30
Hruskoci, Peter A. (Department: 1724)
Liquid purification or separation
With gas separator
C210S195100, C210S199000, C210S202000, C210S206000, C210S208000, C210S218000, C210S221200, C210S906000
Reexamination Certificate
active
10961113
ABSTRACT:
A sludge treatment method allowing an improvement in a phosphorus recovery rate and sludge volume reduction by efficiently eluting phosphorus in the sludge. The sludge treatment method includes: a step of foaming a sludge-containing liquid by blowing an ozone-containing gas into the sludge-containing liquid; and a step of eluting phosphorus in the sludge-containing liquid by bringing sludge adsorbed on bubbles and a sludge-dissolving agent into contact with each other. The sludge treatment method may further include the steps of: separating the phosphorus eluted sludge-containing liquid into a phosphorus eluate and a residual sludge; and precipitating a phosphorus compound by adding a coagulant to the separated phosphorus eluate.
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Nozomu Yasunaga, et al., “Recovering Phosphates from Sewage Sludge”, Mitsubishi Electric Advance, Dec. 2003, pp. 17-20.
Hirotsuji Junji
Kamiya Toshiyuki
Nakatsugawa Naoki
Yasunaga Nozomu
Hruskoci Peter A.
Mitsubishi Denki & Kabushiki Kaisha
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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