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New Patent on "Self-Turning Reactor System: Energy-Saving Type"


From left: Mr. Praj-ya Sungsomboon, Assoc. Prof. Dr. Tetsuya Ishida and Assoc. Prof. Dr. Taweep Chaisomphob, during a visit to the Composting Pilot Plant at Thammasat University, Rangsit Campus, on May 6, 2009.
The Department of Intellectual Property, Ministry of Commerce, Thailand, granted the Patent No. 26147 on "Self-Turning Reactor System: Energy-Saving Type (STR)" to Assoc. Prof. Dr. Taweep Chaisomphob and his colleagues: Assoc. Prof. Dr. Tetsuya Ishida from the Department of Civil Engineering, University of Tokyo, Japan; Dr. Nattakorn Bongochgetsakul, a lecturer of Kochi University of Technology, Japan; and Mr. Praj-ya Sungsomboon, a doctoral student of School of Civil Engineering and Technology, SIIT. Assoc. Prof. Dr. Taweep is a full-time faculty member of the School of Civil Engineering and Technology of SIIT. He received his D.Eng. in Civil Engineering from the University of Tokyo, Japan, and has been recently awarded “Fellow” from School of Engineering, the University of Tokyo. His research areas include: Advanced design methods of steel and composite structures; Shear lag behavior of thin-walled structures; Development of run-off-river hydropower projects; Public participation in infrastructure project development; and Development of efficient composting systems for solid waste treatment.

Composting as a municipal solid waste treatment has been overlooked in Thailand, although it is accepted as the most environmentally friendly. The new composting technology STR was developed to be a fit for small and medium communities which generate waste of less than 50 tons per day. It consists of vertical aeration-type reactors and sets of self-turning units. These two types of units are connected vertically, making a series of composting and turning processes in alternate sequence. A mixture of compost material is firstly loaded in the topmost reactor. After the composting period in the reactor is over, the composted mass is passed to the adjacent self-turning unit and then to the next reactor below in sequential order. After the compost mass has passed all the unit sequences, the compost product is obtained.
Design concept of the STR technology

Figure 1. Design concept of the STR technology

 
 
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