Development of efficient decontamination process of radioactive sewage sludge by magnetic separation

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630479
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Nuclear engineering
• Research Institution: Utsunomiya University
• Principal Investigator: SAKAI YASUZO 宇都宮大学, 工学(系)研究科(研究院), 准教授 (70186998)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 除染 / 下水汚泥 / 磁気分離 / 放射性セシウム / 放射能汚染 / バーミキュライト

Outline of Final Research Achievements

A new decontamination process by application of magnetic separation was investigated using radioactive cesium contaminated sewage sludge. The radioactive cesium which was adsorbed on paramagnetic vermiculite in the soil is carried into sewage sludge by rain water and trapped in the sludge. By using the magnetic column with a 30cm magnet-bar (1T maximum magnetic flux), the contaminated sludge was able to be separated to a small amount of cesium concentrated sludge and large amount of decontaminated sludge. The contaminated actual sludge of 0.37Bq/L was concentrated to 5.4 Bg/L. As a result, the volume of contaminated sludge was able to be reduced to 1/15.

Free Research Field

水処理工学