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RISS 인기검색어
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- 저자 : ( Kaito Sasaki ) (검색결과 1 건)
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( Kaito Sasaki ),( Yasushi Matsufuji ),( Ayako Tachifuji ),( Yukihito Yoshimura ) 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2016 No.-
Leachate which contains high concentrations of organic pollutant often causes river or ground water contaminations because of no leachate treatment facility in developing countries. However, it is difficult for such countries to build a sophisticated leachate treatment facility due to the lack of Money, Mampower, and Material (3Ms). Under such situations, Savonius-type stirrer “ECO-FAN” driving by the wind power has been developed for the biological treatment of leachate in our laboratroy. Based on some past fundamental experiments, it has already been clarified that ECO-FAN is available not only as an aerator for the biological treatment but also as a stirrer for tlie coagulation-sedimentation treatment. Nevertheless the stirring interruption caused by no-wind period under natural wind conditions might influence on the coagulation with a short reaction time. To evaluate the influence of the stirring interruption, the experiment under three kinds of operation condition after adding a coagulant were set up in this study, such as only stopping condition without stirration (Case 1), stirring condition after stopping (Case 2), and only stirring without stopping (Case 3). The stopping time (stirring interruption time) in Case 2 was changed from 30, to 60, 90, and 120 minitues respectively as shown Figure L As a result, the COD removal rates increased slightly according to the increase of the stirring interruption time, ranging 18-24%. But the COD removal rates rose dramatically by adding 30 minitues of stirring, it showed about 45% in case of 5 rpm stirring, and also about 60% in case of 20 rpm stirring. There was no difference of the stirring interruption time less than 2 hours in the COD removal rate (Figure 2). Furtheremore, the COD removal rates in Case 2 with 30 minutes stirring after stopping were mostly equal to the removal rate under only stirring condition without stopping as shown in Figure 2. These experimental results suggested that the coagulation proceed even if the stirring interruption is induced under natural wind condition, as long as the natural wind sometimes rotates ECO-FAN. It means that ECO-FAN is also under natural wind conditions. available as a stirrer for the coagulation-sedimentation treatment
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