| 摘要 |
<p>A PROCESS OF DEWATERING SLUDGE-TYPE MATERIAL AND AN INSTALLATION FOR CARRYING OUT THE PROCESS There is disclosed a process of dewatering sludge and other materials of that kind. The process provides that the raw sludge and a flocculating agent are first mixed by suitable means, then fed into a rotary filter drum or similar device to effect thickening of the sludge and partial dewatering thereof. The now thickened sludge is then conveyed through a filtering assembly in which the sludge is subjected to further dewatering forces, which could be vacuum, centrifugal, static pressure, or pressure while moving along the filter surfaces, thereby further dewatering the sludge. The filtrate discharged from the filter drum and the second filtering assembly and also wash water used for cleaning the filter surfaces in the filter drum and the second filtering assembly are at least partly returned to the filter drum to effect total flocculation and recapture of sludge particles contained in the filtrate and the wash waters. There is also disclosed an installation for carrying out the dewatering process. There is further disclosed a process and installation for partial dewatering of sludge in a drum filter or similar device, wherein the solids in the wash water used to wash the drum filter means are recaptured within the sludge in the drum, before the thickened sludge or filtrate are discharged.</p> |
