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Bumsoo Han, SeongMyun Kim, Jinkyu Kim, Yuri Kim, Jang-Seung Choi, Sang-Jun Ahn, Myun-Joo Lee (EB TECH Co., Ltd. Korea)

Application of High Power Electron Accelerator in Wastewater Treatment

Textile dyeing processes are characterized as high consumption of water, steam and electricity, and discharge of the filthy and colored wastewater. Increased use of assorted dyes and other chemicals hurries in re-equipment of purification facilities by application of efficient methods based on radiation technology. Based on the pilot plant operation since 1997 at Daegu Dyeing Industrial Complex (DDIC), a commercial plant has constructed in 2005. Electron accelerator of 1MeV, 400kW with three separate irradiators was used for the flow rate of 10,000m3 per day. Wastewaters are delivered through the injection nozzles under the electron beam. Continuous operation of this plant showed the preliminary electron beam treatment reduced bio-treatment time twice at the same degree of removal and resulted in more significant decreasing TOC, CODCr, and BOD5. This project is supported by the International Atomic Energy Agency (IAEA), Korean Government and the City of Daegu.

Dr. Bumsoo Han: bshan@eb-tech.com

R.Bartel, U.Gohs, O.Röder (Fraunhofer Institute of Electron Beam and Plasma Technology, Dresden, Germany); H.Dorschner, M.Stephan (Leibniz Institute of Polymer Research, Dresden, Germany)

Requirements on Electron Guns for Innovative Applications in Polymer In- dustry

Electron beam technology is well-established in many industrial branches and in manufacturing techniques. These applications use local and temporal precise input of energy into surfaces, ran- dom layers or volumes in order to exactly heat materials or to generate excited atoms or mole- cules and ions for subsequent molecule changes. The effect of molecule change is used for cross- linking and degradation of polymers. In comparison to alternative chemical processes the poly- mer structure can be change without any use of additional additives. Thus ecologically harmful agents are not required. It is well known that properties of plastics form parts can be modified by electron treatment of plastic pellets before the polymer forming process. Thus the latest electron beam technology in surface treatment of bulk goods has been tested for this application. The mobile “e-ventus” plant (Fig.1) enables a specific modification of processing qualities of plastic pellets and final properties of plastic products. The new plant generation REAMODE is designed for modification of polymers with electrons in reactive gas atmosphere. It has been tested for modification of recycled rubber meal and polypropylene. These modified raw materials were used for the production of thermoplastic elastomers. Finally, a 1.5 MeV electron accelerator was directly coupled with a typical single screw plastics processing extruder for a continuously modi- fication of thermoplastic strands in molten/liquid state at high plastics temperatures (MOBRAD1/T, Fig.2). These tested applications of polymer modification with electrons as well as the requirements on electron beam technology will be presented in detail. Key words: electron beam technology, polymer modification, recycling Fig. 1: Mobile plant for modification of plas- tic pellets Fig. 2: Mobile Radiation Facility MOBRAD1/T

Dr. Uwe Gohs: uwe.gohs@fep.fraunhofer.de

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