A comparative study is presented on decontamination of the solutions containing 226Ra(II), by applying coprecipitation of Ba(Ra)SO 4 followed by flotation and selective adsorption on active carbon. The comparative study revealed the performances of separation by coprecipitation-flotation and the possibility of applying the selective adsorption on active carbon. Both methods ensure the decreasing of 226Ra(II) concentration under the allowed limits, recommended by International Standards.
In communities that are treating relatively clear water (turbidity less than 50 ntu), conventional water treatment processes have been modified by eliminating either the sedimentation process or the flocculation process. This modified system is referred to as direct filtration. Coagulant dosages used in direct filtration systems are much lower than dosages used in conventional treatment systems (less than 20 mg/L). It is therefore important to assess the effectiveness of coagulation and flocculation for virus removal at low coagulant dosages and also to determine the role of turbidity in the interaction between virus and the coagulants.
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