J. Bien et L. Wolny, CHANGES OF SOME SEWAGE-SLUDGE PARAMETERS PREPARED WITH AN ULTRASONIC-FIELD, Water science and technology, 36(11), 1997, pp. 101-106
Citations number
4
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
Studies of sewage sludge conditioning by ultrasonic field concentrate
on determination of the increase of water removal effect, which depend
s on kind of sludge and chemical compounds used in the dewatering proc
ess. An attempt was made to find new methods of sludge preparation bef
ore dewatering. Tests presented here focused on digested and difficult
dewatered sludge. The sludge was dewatered on a vacuum filter after c
onditioning with polyelectrolytes and the ultrasonic field. The micros
copic analysis was an additional criterion to evaluate changes in the
sludge structure after preparation. The polyelectrolyte dose of 3 mg/g
d.m. sonicated within 15 sec. resulted in the 50% decrease of sludge
volume. Results presented confirmed our previous experiences, concerni
ng the relation between conglomerates of sludge and the effect of dewa
tering. (C) 1997 IAWQ. Published by Elsevier Science Ltd.