혐기적 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 활설이 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 최적 농도는 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-hydroxybuty-rate/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).

Plastic Biodegradation Anaerobic Municipal Digested Sludge Cellophane PHB/HV

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