Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai, Maharashtra, India.
Institute of Civil Engineering, Warsaw University of Life Sciences, Warsaw, Poland.
Waste Manag Res. 2021 Nov;39(11):1375-1388. doi: 10.1177/0734242X211045607. Epub 2021 Sep 20.
Estimation of temporal changes undergone by municipal solid waste (MSW) in its physico-chemico-geomechanical properties in a bioreactor landfill (BLF) is essential for: (i) efficient landfilling, (ii) establishing the state of decomposition of MSW with time and (iii) deciding upon the appropriate time to initiate landfill mining. To achieve this, a series of destructive (DTs) and non-destructive tests (NDTs) can be conducted on the MSW samples in the BLF. With this in view, several DTs were conducted on these samples retrieved from different depths of the two cells of a fully operational BLF in Mumbai, India. Subsequently, the physical and chemical properties of these samples such as composition, moisture content, volatile solids (VS), elemental content, lignocellulosic content (i.e. cellulose, hemicellulose and lignin content) and bio-methanation potential, were determined by following the laboratory testing, as a function of time. Also, NDTs such as cone penetration test and multichannel analysis of surface waves were conducted on these cells of BLF to obtain geomechanical parameters (viz. cone resistance, sleeve resistance, friction ratio and shear wave velocity) of the MSW. Based on the data obtained from these tests, and reported in the literature, it has been observed that the VS, elemental content, lignocellulosic content and bio-methanation potential of MSW exhibits very well-defined trends, as compared to the geomechanical parameters, with time. Furthermore, it has been observed that the VS, hydrogen-, carbon- and nitrogen-content reduce significantly (≈62%, 70%, 50% and 30%, respectively), following an exponential decay, until the critical time () (≈4 years) has been achieved. As, beyond these parameters remain practically unchanged, which corresponds to the 'stabilized MSW', mining of the BLF can be initiated without further delay.
估算生物反应器填埋场 (BLF) 中城市固体废物 (MSW) 在物理化学地质力学性质方面随时间的变化对于以下方面非常重要：(i) 高效填埋，(ii) 确定 MSW 随时间的分解状态，以及 (iii) 决定何时开始填埋场开采。为了实现这一点，可以对 BLF 中的 MSW 样品进行一系列破坏性 (DTs) 和非破坏性测试 (NDTs)。有鉴于此，对从印度孟买一个全运作 BLF 的两个单元的不同深度取回的这些样本进行了几项 DT。随后，通过以下实验室测试，随着时间的推移，确定了这些样本的物理和化学特性，例如组成、水分含量、挥发性固体 (VS)、元素含量、木质纤维素含量（即纤维素、半纤维素和木质素含量）和生物甲烷化潜力。此外，还对这些 BLF 单元进行了 NDT，如圆锥贯入试验和多道面波分析，以获得 MSW 的地质力学参数（即圆锥阻力、套管阻力、摩擦比和剪切波速度）。基于这些测试获得的数据以及文献中的报告，可以观察到与地质力学参数相比，MSW 的 VS、元素含量、木质纤维素含量和生物甲烷化潜力随时间呈现出非常明确的趋势。此外，还观察到 VS、氢、碳和氮含量呈指数衰减，显著减少（分别约为 62%、70%、50%和 30%），直到达到临界时间 ()（约 4 年）。由于这些参数在之后几乎保持不变，对应于“稳定的 MSW”，可以立即开始 BLF 的开采。
