Sludge treatment method

Details Sludge treatment method Sludge treatment method

2008-01-22

2008-01-22

Hruskoci, Peter A. (Department: 1724)

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

C210S609000, C210S718000, C210S721000, C210S760000, C210S906000

Reexamination Certificate

active

11559006

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.

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