非正规填埋场矿化垃圾理化性质与资源化利用研究

为探索非正规垃圾填埋场矿化垃圾资源化利用问题,以广东省东莞市常平镇桥沥垃圾填埋场矿化垃圾为例,多点采集样品经人工分拣和不同粒径段筛分后,对其物理组成和化学性质进行了分析.结果表明:矿化垃圾中腐殖土主要在40mm粒径段以下,占47.3%,塑料、织物及木竹等可燃轻质垃圾主要在大于80mm粒径段,占40.1%;工程筛分粒径可选40mm,筛上物主要为可燃物,筛下物主要为腐殖土;按照有机肥堆肥腐熟标准,筛下物腐殖土基本可达到腐熟,营养物质含量达到《城市生活垃圾农用标准》(GB8172-1987)要求,但部分重金属含量超标;矿化垃圾经筛分后的轻质垃圾,热值约为6000kJ/kg,可直接进行焚烧处理,将其制备成垃圾衍生燃料(RDF)后,热值可达10000~24000kJ/kg.

Physicochemical properties and resource utilization of aged refuse in informal landfill

In order to explore the resource utilization of aged refuse in informal landfill, in this study, the municipal aged refuse collected from Dongguan Qiaoli Landfill in Guangdong Province were investigated. Mixed sample solid waste were sorted manually and divided into several groups according to different sizes, their physical composition and chemical properties were analyzed. The result indicated that: aged refuse from the group of 0~40mm were mainly humus soil and accounting for 47.3% of total aged refuse, while aged refuse from the group of >40mm were mainly combustible refuse and accounting for 40.1%, such as plastic, fabric, bamboo etc. The 40mm was reasonable for sieving particle size in engineering application, above 40mm were mainly combustibles, and others were mainly humus soil. The humus soil can reach the standard of maturity index of composting, in terms of the control standards for urban wastes for agricultural use (GB8172-1987),the content of nutrient in humus soil is qualified, but the content of partial heavy metal was over standard. These combustible refuse could be incinerated with calorific value of about 6000kJ/kg, when these combustible refuse were prepared of refuse derived fuel (RDF), there calorific value can incrsase to 10000~24000kJ/kg .