准好氧填埋工艺陈腐垃圾的理化特性变化规律

针对准好氧填埋工艺,研究了实际填埋场1~5年陈腐垃圾的含水率、有机质和腐殖质等理化特性动态变化规律。结果表明,垃圾含水率、电导率、有机质均随着填埋时间的增加呈现明显的降低趋势,且导气管附近垃圾样品(0 m)垃圾含水率、有机质降低速度相对较快,在填埋3年后含水率达到相对稳定的状态,有机质含量的降低主要发生在填埋处置的第2年;垃圾pH值、腐殖质提取率和富里酸含量呈现明显升高的趋势,且距离导气管较远垃圾样品(15 m)pH值升高速度相对较快,在填埋1年左右存在明显的酸化阶段;胡敏酸含量和HA/FA比则呈现出前期升高后期降低的趋势,其中导气管附近垃圾样品(0 m)的变化明显快于距离导气管较远(15 m)的垃圾。

Physic-chemical properties variations of aged refuse in semi-aerobic landfills

One to five years old aged refuses from operating semi aerobic landfill sites were sampled, and the physic-chemical properties variations (such as, water content, organic matter content and humus content, etc.) of the samples were investigated. The results showed that the water contents, electrical conductivities and organic matter contents significantly declined with the landfill ages increasing. Moreover, the water content and organic matter content of aged-refuse samples near the air pipe (0 m) decreased rapidly, while the water content achieved stable state after 3 years landfilling, and the main organic matter content decline occurred in the first two years. The pH values, humus extraction rates and fulvic acid contents of aged-refuses raised with the landfill age increasing, and the pH value of aged-refuse far from the air pipe (15 m) increased rapidly, which means that there was the obvious acidification phase existing at landfill time of 1 year. In addition, with the landfill age increasing, humic acid content and HA/FA ratio increased in earlier stage, and then decreased later, in which variation trends of the aged-refuse samples near air pipe (0 m) significantly fastened than that of the samples far from the air pipe (15 m).