抄録
Coagulation property of particle on the treatment of radioactive waste water by floculation method is varied with its electrical potential and mixing condition. The surface state of the particle is influenced by contents of coexistent materials in the waste water and added materials at the treatment process.
In the case of using ferric hydroxide as coagulant, assuming the ions which decide the potential of the particle surface are Fe(OH)2+ and Fe(OH)4-, calculated values of the potential agree with zetapotential of ferric hydroxide particle which is formed from FeCl3 and NaOH in demineralized water.
When Na2CO3 is in the waste water as coexistent materials, anion HCO3- or CO32- adsorbs on the particle surface in connection with pH variation and thus the surface charge is being minus. If Ca2+ ion is present in the waste water, the surface charge plus. ABS acts as single molecule anion at low concentration, but it forms micell at high concentration and influences zeta-potential of the particle.
The potential of the particle is correlated to the coprecipitation rate of 90Sr in the waste water.
