Enhancement on methane oxidation in cover soil of landfill by compost alone or addition

• Main Authors: Bo Hung Chen, 陳柏亨
• Other Authors: 廖文彬
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/71271192301608542570

碩士 === 國立中興大學 === 環境工程學系 === 94 === Most municipal and agricultural wastes can be composted to recover the nutrients in organic matter. Compost of bagasse is simple in the ingredients, and has constant properties. We select the compost of bagasse as the major additive in the study. The compost was added by 10%, 20%, or 30% into the cover soil of a landfill. The activity of methane oxidation of the cover soil increased from 90 nmol/hr-g dry soil up to 1018, 1142, and 1112 nmol/hr-g dry soil respectively. Although the maximum oxidation rate differs not much, but more percentage of compost lasted for a longer period of time. The sample of 10% compost maintained only 10 days, while the sample of 30% lasted over one month or even longer. In the column tests, the most active zone of methane oxidation located at a depth of 10~20 cm. The soil without compost dried out more easily under the emission of methane. Thus, the active depth is deeper for the soil without compost. Either soil mixed with compost or compost only could keep moisture content in the column. That is the reason for the active zone being closer to the top surface. From this study, we realized that the compost can increase the oxidation rate of methane in the cover soil of landfill. A percentage of 30% compost will facilitate the methanetroph’s growth and maintain a higher rate of oxidation over a longer time period. We highly recommend the addition of compost into the surface soil of landfill due to the engineering benefits.