ESTIMATION OF SETTLING VELOCITY AND CHARACTERISTICS OF PARTICLE-WATER INTERFACE ON ORGANIC MUD IN A BRACKISH LAKE

Abstract

Distribution of settling velocity and characteristics of particle-water interface were discussed by using organic mud in Lake Abashiri located in a cold region, east Hokkaido in Japan. The distributions of settling velocity were estimated from temporal variations measured by laser diffraction analyzer. Since the settling velocity of cray mineral sample having low cohesiveness with dispersing agent agreed well with theoritical value, the analytical method were well verified. Comparing with the model consdering organic substances in floc, floc structure varies with floc size in lake water less than in distilled water. Zeta potential representing interface characteristics of organic mud is closely related to dissolved divalent-ion derived from sea water and humic-like organic substance.