Category of Environmental Fate and Cleaning

Technical development of dry desulfurization and deammoniation using sewage sludge char/ NEDO project in 2010-2012

　In order to develop the new energy saving sludge treatment system combining with bio-drying and carbonization technology, the elemental study of sludge bio-drying technology, desulfurization technology and deodorization technology, the utilization study of carbonized sludge, and the optimization study of new sludge treatment system was conducted in this research project. Seven different studies were carried out as following; (1) the study of high speed bio-drying technology, (2) the study of desulfurization and deodorization technology, (3) the study of activated carbon liquid manufacturing technology, (4) the study of water treatment use technology, (5) the study of sludge treatment utilization technology, (6) the study of high efficient sludge carbonization process, and (7) the study on optimization of sludge treatment system. Conducting those studies, many beneficial results were obtained for the construction of energy and cost saving sludge treatment system. In our laboratory, the No.2 study has been performed.

Characterzation of fly ash from pulverized coal combustion process

 　Coal combustion byproducts predominantly consist of fly ash, bottom ash, and boiler slag. The environmental hazards associated with coal combustion byproducts are of concern with respect to potential health effects. Among the trace elements in coal fly ashes, arsenic, cadmium, copper,mercury, and lead are the greatest concern as environmental hazards.
　 In our laboratory, a technique based on Graphite furnace atomic absorption spectrometry (GFAAS) for the direct measurement of arsenic in several coal fly ashes produced from pulverized-coal-fired boilers has been developed.

• (1)Modeling of atmospheric dispersion of mercury from coal-fired power plants in Japan
  (2)Development of toolkit for mercury material flow / Project of the Ministry of the Environment in 2011-2012

   

   　The behavior of mercury in pulverized coal combustion process has ever been investigated in our laboratory. Recently, the modeling of atmospheric dispersion of mercury from coal-fired power plants in Japan and the development of toolkit for mercury material flow are performed.
  
  

  
  Development of environmental cleaning method using plasma and photochemistry

   

   　In our laboratory, the removal method of NO in flue gas by injecting ammonia radicals, which were externally generated by flowing NH3 gas diluted with Ar gas through a dielectric barrier discharge (DBD) with a one-cycle sinusoidal-wave power source, has been developed . In addition, recently, the removal method of nitric oxide using activated ammonia generated by vacuum ultraviolet radiation has also been developed.
  
  

  
  3D simulation of elementary reaction of thermal fluid

   

   　In our laboratory, the distributions of the temperature and composition in the combustor and gasifier of coal and biomass have ever been simulated. Recently, the calorific property of lithium ion battery has also been simulated.