Abstract: In order to meet the national requirements for disposal of radioactive wastewater produced by scientific research, a device was constructed for wastewater concentration and volume reduction. The applicability, cost and simplicity of maintenance were considered for designing the device, into which a new technology of ultrafiltration membrane treatment was introduced. The combination of methods of flocculation, ultrafiltration(UF), ion exchange treatment and re-treatment was adopted. The device was tested for commissioning using stable elements of Co and Sr. The results show that the removal percentage of treatments is achieved more than 99% for Co, and non-detectable level for Sr, in accordance with the national requirements for removal percentage of treatments and wastewater discharge regulations.