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생물학적 고형물의 침전성에 대한 부식토양의 물리 , 화학적 효과 분석
최영균(Young Gyun Choi),정태학(Tai Hak Chung) 한국물환경학회 2001 한국물환경학회지 Vol.17 No.1
An experimental study was conducted to investigate the effects of soil particles upon the settling properties of the biosolids using humus soil (HS) powder and fresh activated sludge. Settling properties of the biosolids were altered remarkably by the presence of the HS particles. An attempt was made to identify the physical effect and the chemical effect of the HS particles addition. Cation mixtures equivalent to the cations leaching from the HS were introduced for estimation of only the chemical effect. The physical effect was then isolated by subtracting the chemical effect. Based on the results of the batch settling tests and the microscopic observations it may be concluded that the chemical effect takes part in 30∼50% of the overall improvement of the settling properties and the physical effect, mainly by floc density increase. is more important in the improved settling properties by the HS addition.
티타늄 전극과 전기분해를 이용한 상수 원수의 망간 제거
최영균 ( Young-gyun Choi ),서호영 ( Hoe-yeong Seo ),김성홍 ( Sung-hong Kim ) 조선대학교 공학기술연구원 2020 공학기술논문지 Vol.13 No.1
Manganese causes the black water of tap water. In this study, we investigated the effect of electrolysis for the removal of manganese under various conditions of electrode type, contact time, operating voltage, and catalyst use. The following results were obtained. The manganese removal rate is proportional to the contact time. The difference of manganese removal rate between the titanium electrode and the manganese dioxide coated electrode was not significant. The manganese removal rate was increased as the voltage increase up to 24V. However, it was slightly decreased at 30V. Manganese removal was not increased by electrolysis combined by aeration but the rate was rapidly increased by electrolysis combined with hydrogen peroxide.