Patent ID: 7736511

Claim:
Procedure for treating a suspension of biological-material in water, in a treatment plant, including: conveying the suspension into and through a treatment station of the treatment plant, in which the suspension undergoes a microbiological breakdown reaction; adding a feedback-substance, prepared as follows, into the suspension being treated in the treatment station; conveying the suspension, having been treated in the treatment station, out of the treatment station; wherein the feedback-substance is a 10%-or-higher-solids-sludge, being sewage-sludge having a solids content of about ten percent or higher, by weight; and the feedback-substance has the characteristics of 10%-or-higher-solids-sludge that has been placed in a reactor, in which: (a) the temperature of the sludge is raised to about sixty deg C. or higher for a period of time; (b) the pH of the sludge is maintained at a level of about pH-7 or higher, for a period of time; (c) the sludge is violently sheared, in the reactor, for a period of time; and (d) the feedback-substance is 10%-or-higher-solids-sludge in respect of which the combination of (a), (b), (c), and the respective periods of time, has been sufficient to liquidise the sludge, and sufficient to substantially solubilise biological materials in the sewage sludge from which the feedback-substance is prepared.