Abstract
Coagulation kinetics of dispersed micro-cellulose in water were studied, using aluminum sulfate as a coagulant.
The coagulation rates in the early stage in a stirred tank were measured in terms of the "waiting time", tp, by using a light transmission measurement.
The coagulation rate constants, KB (by Brownian motion) and KF (by the velocity difference of the particles), were estimated by extrapolating l/tp against the agitation rate to the intercept and the experimental expression of the overall rate constant, K, was determined.
The KB values (obtained) agreed well with Smoluchowski''s equation. The estimated values of KF> were proportional to ε1/20, as expected theoretically, and to μ-1.2, differing from the theoretical dependence, μ-1/2. The latter deviation means a larger temperature dependency of KF in the real system than that in the theory. The order of magnitude of the coalescence efficiency, a, is also discussed.
