Compression behaviors of mechanically biologically treated wastes of Tianziling landfill in Hangzhou, China
Compression behaviors of mechanically biologically treated wastes of Tianziling landfill in Hangzhou, China
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中国杭州天子岭垃圾填埋场机械生物处理垃圾的压缩行为
DOI：
10.1007/s11356-020-10253-w
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发表时间：
2020
影响因子：
5.8
通讯作者：
Xu Hui
中科院分区：
文献类型：
--
作者：
Zhang Zhen-ying;Fang Yue-hua;Wang Yi-xuan;Xu Hui
本研究旨在探讨机械生物处理(MBT)废弃物的压缩特性。为此，对中国杭州天子岭垃圾填埋场收集的MBT垃圾进行了短期压缩-回弹和长期压缩试验。结果表明，即时压缩时间为15.17~36.67h，与城市生活垃圾相当。即时压缩比为0.233-0.247，与陈年高厨余垃圾、新鲜和陈年低厨余垃圾相当，但远低于生鲜垃圾。其机械蠕变比(C‘αc)为0.012~0.018，与新鲜和陈化垃圾接近。生物诱导压缩比(C‘αb)为0.143~0.174。在机械蠕变阶段和生物诱导压缩阶段，压缩比均随温度(5~42℃)呈指数上升，且在生物诱导压缩阶段增加得更快。在相同的应力区间，回弹应变仅为压缩应变的2.1-3.3%，表明压缩应变以塑性变形为主，弹性变形可忽略不计。以上研究成果可为MBT垃圾填埋场的沉降预测和库容估算提供参考。
This study aimed to investigate the compression behaviors of mechanically biologically treated (MBT) wastes. For this purpose, the short-term compression-rebound and long-term compression tests were conducted on MBT wastes collected from Hangzhou Tianziling landfill in China. The results showed that the duration of immediate compression was obtained as 15.17–36.67 h and was comparable to municipal solid waste (MSW). The immediate compression ratio was 0.233–0.247, and it was comparable to the aged high food waste content (HFWC)-MSW, fresh and aged low food waste content (LFWC)-MSW, but much lower than the fresh HFWC-MSW. The mechanical creep ratio (C′ αc) was 0.012–0.018, being close to the fresh and aged MSWs. The bio-induced compression ratio (C′ αb) was 0.143–0.174. The compression ratio rose exponentially with temperature (5–42 C) in both mechanical creep stage and bio-induced compression stage, and it increased much faster in the bio-induced compression stage. The resilient strains was only 2.1–3.3% of the compression strain at the same stress interval, suggesting that the compression strain consisted of mostly plastic deformation and negligible elastic deformation. The above findings can provide a reference for settlement prediction and storage capacity estimation of an MBT waste landfill.