Compression behaviors of mechanically biologically treated wastes of Tianziling landfill in Hangzhou, China

Zhang, Zhenying; Fang, Yuehua; Wang, Yixuan; Xu, Hui

Compression behaviors of mechanically biologically treated wastes of Tianziling landfill in Hangzhou, China

2020

Zhang, Zhenying | Fang, Yuehua | Wang, Yixuan | Xu, Hui

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.

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