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생물화공 , 에너지 / 환경 : 성형조건에 따른 무연탄계 활성탄의 세공특성
이송우(Song Woo Lee),나영수(Young Soo Na),김도한(Do Han Kim),류동춘(Dong Chun Ryu),최동훈(Dong Hoon Choi),류병순(Byung Soon Ryu),송승구(Seung Koo Song) 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.1
This study was to investigate the effect of granulation process on pore characteristics in manufacturing anthracitebased activated carbons. The activated carbons were made by three different methods to compare characteristics: the crushed activated carbon, the compressed activated carbon, and the extruded activated carbon. Among these activated carbons, the extruded activated carbon using a binder that consists of 25% coal tar and 7% water showed the best characteristics in specific surface area, pore volume, and hardness. Since the compressed and the extruded substances had coarser surfaces than a raw material, steam could penetrate easily through particles and produce macropores especially in the diameter ranges of 3,000-50,000Å during activation process. The extruded activated carbon showed about twice more macropore volumes than the crushed activated carbon and the hardness was increased from 30% up to 95%.
Dewatering Characteristics for Physico-chemical Properties with Sewage Sludge
이창한,안갑환,송승구,Lee, Chang-Han,Ahn, Kab-Hwan,Song, Seung-Koo The Korean Society for Biotechnology and Bioengine 2010 KSBB Journal Vol.8 No.1
In this study, we found that dewatering properties were related with physico-chemical properties such as sludge concentration, pH, and zeta potential with sewage sludge, Ionic contents in digested sludge were in the order of $Ca^{2+}$ (14.2 mg/g) > $Mg^{2+}$ (1.9 mg/g) > $Na^+$ (1.4 mg/g) > $K^+$ (1.0 mg/g). Divalent ion more than monovalent have influenced on physico-chemical and dewatering properties. Floc size distribution in activated (AS) and digested sludge (DS) increased on lower pH range to be near isoelectric point and than specific resistance to filtration (SRF) decreased. A linear increase in SRF ($5.25\times10^{13}\sim2.86\times10^{14}$ m/kg in AS and $6.89\times10^{14}\sim1.09\times10^{15}$ m/kg in DS) was observed throughout low concentration range of 1230~9960 mg/L in AS and 2700~5400 mg/L in DS.