Analysis On Disposal Of Associated Radioactive Solid Waste In Guangdong Province

With the development of science and technology in China,the exploitation and utilization of associated radioactive mine such as rare earth,tantalum and niobium are increasing rapidly,and a large number of associated radioactive solid wastes are produced.The amount of associated radioactive solid waste determined in the first national pollution source survey is 170 million tons,and the solid waste has natural radionuclides.If the waste is directly released into the environment,it will cause serious radioactive pollution to the soil and water around.About 100 thousand tons of solid wastes with single radionuclide activity concentration more than 1Bq/g in Guangdong province have not been properly disposed,so most of them are stored in the air or temporary indoors.A large number of wastes are directly exposed on the environment,which is the risk of radioactive pollution that cannot be neglected,occupying a large amount of land and restricting the development of corporation.Guangdong province has been committed to dispose in a centralized way for the associated radioactivesolid to eliminate the radiation environmental risks caused by the wastes.Setting the issue of associated radioactive waste in Guangdong province as the background,designing surface landfill disposal proposed the countermeasures and implementation plan for the feasibility demonstration combined with the disposal situation of waste in Guangdong province.Finally,Guangdong province can employee the centralized landfill for the waste by constructing centralized landfill disposal site to tackle the issue of disposal in the province.The result can provide the references of disposing the associated radioactive solid waste and building surface centralized landfill disposal site in Guangdong and other provinces.The main works conducted were as followed:(1)Applying the proper national standards,technical parameters of waste pre-treatment and its landfill were obtained;the overall idea of waste landfill and the classified principle of waste landfill were determined by the need of waste disposal;the industrial process of waste landfill was designed by referring to a hazardous waste safety disposal site at home,and a surface landfill centralized disposal method was proposed from facility construction,waste transportation,operation management and decommissioning treatment.(2)By investigating 35 rare earth,tantalum,niobium and zircon sand enterprises in Guangdong province,the quantity of untreated solid waste in the province,current situation of management and disposal demandwere known;61 waste samples were obtained from 21 enterprises for laboratory test and analysis,and the characteristics of waste source items such as uranium content and pH value were obtained,and the existed problems and disadvantages of waste disposal in Guangdong Province were proposed based on the investigation.(3)In view of the problems and drawbacks of waste disposal in Guangdong province,this paper proposed countermeasures and utilized the implementation plan for building a centralized landfill site by shutting down uranium mine site.Firstly,the industrial policy,waste source term and uranium mine site were analyzed,and the preliminary conclusion that Guangdong province has the basic conditions for building a centralized landfill site was given.The method of surface landfill disposal of waste was referred by combining with the real situation of uranium mine to determine the waste classification standard,regional landfill method and landfill process flow.The project construction,waste transfer and facility decommissioning plan was proposed to verify the feasibility of the implementation plan in accordance with the waste disposal requirements in Guangdong province,national laws and regulations,standards and specifications.