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고분자의 혐기적 생분해도에 영향을 미치는 하수 소화 슬러지의 인자들
김명희,신평균,김종민,김병홍 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.1
형기적 조건에서 플라스틱의 생분해도를 측정할 때 미생물원으로 사용되는 소화조 슬러지의 특성 중 플라스틱의 생분해도에 미치는 영향 인자에 대하여 조사하였다. 1994년 5월부터 7개월간 채취한 중랑 하수처리장(서울) 소화 슬러지의 유기물 함량(total organic solids)은 0.52-0.86%로 변하였다. 슬러지의 cellophane에 대한 생분해도는 슬러지의 유기물 함량과 일치하지 않았으며 여름철(7, 9월)에 채취한 슬러지의 생분해 활성이 특히 낮았다. 그러나 poly-β-hydroxybuty-rate/hydroxyvalerate 공중합체(PHB/HV, 92/8, W/W)의 생분해도는 슬러지의 유기물 함량과 일치하였다. 슬러지의 접종량이 증가할수록 cellophane과 PHB/HV의 생분해 속도는 증가하였고 분해 지체기는 감소하였다. 슬러지 접종의 최적농도는 배지 중의 총 유기성 고체의 농도 0.10-0.20%(w/v)이였다. The characteristics of anaerobic digested sludge affecting the biodegradation of plastic materials under anaerobic condition were studied. The percent organic matter(total solid×volatile solid, VSS) of sludges obtained from Joongrang Municipal Wastewater Treatment Plant in Seoul had varied from 0.52% to 0.86% during the period of 7 months from May, 1994. The biodegradation activity of sludges for cellophane didn't correspond to the VSS. Sludges of July and September showed lower activities than others. But biodegradation activity for poly-β-hydroxybutyrate/hydroxyvalerate copolymer(PHB/HV, 92/8, W/W) corresponded well to VSS value. The biodegradation rate for both cellophane and PHB/HV increased as the concentration of sludge inoculum increases along with the decrease of lag period. The optimal total organic solids in the test medium was determined as 0.10-0.20%(W/V).
Effects of compost and culture conditions on the biodegradation of degradable plastics
Jung, Eun Joo,Shin, Pyong Kyun,Bae, Hee Kyung 嶺南大學校 環境問題硏究所 1998 環境硏究 Vol.18 No.1
AbstractBiodegradable polymers have been regarded as a good alternative to solve the solid waste problem caused by non-degradable synthetic polymers such as polyethylene and polystyrene. Because of their biodegradability, they can be easily treated in the current solidwaste treatment systems like composting or anaerobic digestion. To promote the usage of biodegradable polymers, proper evaluation methods are critical. Many standard methods have been issued for biodegradable polymers. One of the methods is the test method to measure the biodegradability under controlled composting condition.To evaluate the effectiveness of current test method under controlled composting condition, the effects of compost conditions on the biodegradability of degradable polymers were studied with compost harvested after thermophilic degradation stage or cured for one month at two different temperatures, 55 and 15℃. Compost harvest right after thermophilic degradation stage showed highest biodegradation activities among three composts for both a synthetic aliphatic polyester and a natural polymer, cellulose at test temperature of 55℃. When the biodegradability test with the compost cured at ambient temperature was performed at the temperatures of 35 and 55℃, cellulose degradation was faster at 35℃ than at 55℃, while the degradations of the syntheitic aliphatic polyester at both temperatures were similar. Our results reveal that the biodegradation activity of the compost is greatly influenced by the test temperature and compost conditions.