Method and installation for the thermal hydrolysis of sludge

Details Method and installation for the thermal hydrolysis of sludge Method and installation for the thermal hydrolysis of sludge

2005-11-22

2005-11-22

Prince, Fred G. (Department: 1724)

Liquid purification or separation

Processes

Treatment by living organism

C210S613000, C210S620000

Reexamination Certificate

active

06966989

ABSTRACT:
The invention relates to a method for the thermal hydrolysis of sludge characterized in that it is carried out in at least two reactors operating in parallel, in each of which the sludge undergoes a complete thermal hydrolysis cycle. Said cycle comprises different stages consisting in supplying the reactor with the sludge, injecting live stream in order to bring said sludge to a pressure P and a temperature T at which hydrolysis can occur, maintaining the sludge at said pressure P and said temperature T for a certain amount of time, suddenly bringing said sludge to the atmospheric pressure by releasing the flash steam and emptying said reactor of the hydrolysed sludge. Furthermore, the inventive method consists in time shifting the cycle of one reactor to the other in order to use the flash steam produced from one reactor to inject it into the other reactor.

REFERENCES:
patent: 4017421 (1977-04-01), Othmer
patent: 4203838 (1980-05-01), Shimizu et al.
patent: 4261836 (1981-04-01), Koglin
patent: 5188740 (1993-02-01), Khan
patent: 5785852 (1998-07-01), Rivard et al.
patent: 6521133 (2003-02-01), Roediger

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