Process of eluting and recovering phosphorus from sludge

Details Process of eluting and recovering phosphorus from sludge Process of eluting and recovering phosphorus from sludge

2006-07-04

2006-07-04

Langel, Wayne A. (Department: 1754)

Chemistry of inorganic compounds

Phosphorus or compound thereof

C210S723000, C210S760000, C210S764000, C423S306000, C423S308000, C423S311000, C423S317000

Reexamination Certificate

active

07070747

ABSTRACT:
In a process of eluting phosphorus from sludge into a liquid phase and recovering the phosphorus efficiently, cell walls of microorganisms in the sludge are ruptured by a process selected from crushing sludge (for example, treating with an ultrasonic wave homogenizer), treating with ozone, and treating with heat. Then the liquid phase is treated with alkali, thereby eluting the phosphorus into a liquid phase efficiently in a short time. By coagulating and precipitating, the phosphorus eluted into the liquid phase is recovered.

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Jardin et al.; “Refixation of Phosphates Released During Bio-P Sludge Handling as Struvite or Aluminium Phosphate”, Environmental Technology, vol. 22, pp. 1253-1262 (2001), no month.

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