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음식물쓰레기의 고온 혐기성 소화도에 미치는 요소에 대한 분석
김도희(Do Hee Kim),현승훈(Seung Hoon Hyun),김경웅(Kyung Woong Kim),조재원(Jaeweon Cho),김인수(In S. Kim) 유기성자원학회 2000 유기물자원화 Vol.8 No.2
Serial basic tests were conducred for the dererrnination of fundamental kinerics and for the actual application of kineric parameter to food wasre digesrion with precise measurement of methane production under a thermophilic condition. The effecrs of food particle size, sodium ion concentration, and volarile 5이id (VS) loading rare on rhe anaerobic thermophilic food wasre digesrion process were investigared. Results of serial test for the determination of fundamental kinetic coefficients showed the value of k (maximum subsrrare utilizatÎon rare coefficient) and KS (h빠 saturarion coeffìcient) as 0.24 hr-1 and 700 mg/l, respectively, for non-inhibiting organic loading range. No inhibition effect was shown untiI 5 g/l of sodium ion concentration was applied to a serum bottle reactor. However, the volume of mεthane gas was decreased gradually when the concentrations of more than 5 g/l of sodium ion applied. All sizes of food waste particle showed the same consranrs (A : 0.45) but the maximum subsrrare utilizatÎon rate constam (kHA) was inversely proportional to particle size. As an average particle size increased from 1.02 mm to 2.14 mm, kHA decreased from 0.0033 hr-1 to 0.0015 hr-1. The resulr reveals thar particle size is one of the mosr important factors in anaerobic food wasre digestion. There was no inhibition effect of sodium ion when VS loading rare was 30 g/ l. And maximum injection concentration of VS loading rare was derermined about 40 g/l.
적정기술로서의 정수기(옹달샘), 인공처리습지(황금연못), 생태화장실(윤동주화장실) 사례 소개
박종관(Jongkwan Park),오요셉(Joseph Oh),신흥섭(heungsup Shin),Jan Vymazal,조재원(Jaeweon Cho) 적정기술학회 2015 적정기술학회지(Journal of Appropriate Technology) Vol.1 No.1
적정기술은 작지만 큰 기술이다. 현재 보이지 않는 적정기술의 비전은 상상하기 힘든 결과와 보상을 우리에 줄 수도 있다. 물, 화장실보다 우리의 생활과 밀접한 것도 드물것이다. 이를 해결하지 않고 과학기술을 논하는 것은 과학은 인간과는 무관하다는 전제를 인정하는 것이다. 과학기술자로서 세상 속에서 할 수 있는 일이 무엇인지를 고민하는 과정 에서 나온 개념이 적정기술이고 이를 위해 우리가 가진 지식 속에 마음을 담는다면 분명 우리에게 따뜻한 보답이 올것이라고 믿는다. 그것이 자연의 법칙이고 인간의 법칙이기도 하기 때문이다. 과학기술의 후유증을 치유하는 차원의 적정기술의 역할을 기대하여 본다. Appropriate technology is envisioned to be small as it demands less energy, helps, and materials especially from far away, and also envisioned to be big as it has no limitation to imagine from the fact that the technology is closely connected to everyday life of the village residents. While performing projects using appropriate technologies with water and toilet, works toward a new world are believed to bring various values, such as empathy between residents and engineers/scientists. Thus, it is appropriate technology that is able to cure the aftermath of the modernized developments.