| 摘要 |
The invention concerns a method characterised in that it comprises two recycling modes: one high energy operating mode, for extracting the ballast contained in the ballast-floc agglomerate and so, in particular for separating the sand from the sludge, eliminating the floc in the form of sludge and recycling the cleaned ballast to flocculation; a low energy operating mode for transferring the ballast-floc agglomerate to the flocculation step as long as the proportion of ballast in the flocculator is higher than a predetermined level, said low energy operating mode being maintained activated when the high energy mode is started, but stopped while the high energy mode is operating, the two systems being alternately operated so as to maintain the proportion of ballast at a predetermined level.
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