High-speed sludge freezing.
The investigation examined the feasibility of applying a "high-speed freezing technique, using liquid nitrogen freezing, to condition activated sludges and alum sludges. Experimental results indicate that the freezing speed is much faster than that adopted in most previous works on sludge freezing. Although the filterability and settleability of the alum sludge is improved by 3-min liquid nitrogen freezing, no similar improvement is observed for activated sludge. Moreover, curing affects neither sludge after liquid nitrogen freezing, but affects the slow-freezing activated sludge.
Chen
L C
LC
Department of Chemical Engineering. National Taiwan University, Taipei.
Chian
C Y
CY
Yen
P S
PS
Chu
C P
CP
Lee
D J
DJ
D000534:Alum Compounds / Q000737:chemistry; D005374:Filtration; D005427:Flocculation; D005615:Freezing; D009584:Nitrogen; D012722:Sewage / Q000737:chemistry*; D013997:Time Factors
D000534:Alum Compounds; D012722:Sewage; C041524:aluminum sulfate; D009584:Nitrogen