Identification of initial settlement of municipal solid waste layers in Indonesian landfill

Abstract

This study presents the measurement of municipal solid waste (MSW) compressibility and subsequent development of a landfill settlement estimation model incorporating a correction factor accounting for initial settlement prior to the addition of pressure/municipal solid waste layers. Three layers of municipal solid waste obtained from a temporary waste station in Bandung, Indonesia, were placed in each of three different lysimeters/treatments (MSW, layer height 35 cm; MSW, layer height 70 cm; and MSW, layer height 35 cm), with a time lag of sample layer input of 2 days. Tests were then undertaken based on the ASTM D2435 test standard - Standard Test Method for One-Dimensional Consolidation Properties of Soils - revealing large immediate and secondary compression ratio values reflecting the high moisture and organic matter content of the analysed municipal solid waste. From the test results, it was also detected that the initial settlement of the analysed municipal solid waste was considerable even before the addition of pressure/further layers, ranging from 10% to 17%. Thus, a modification was made to the classical Sowers settlement estimation model in the form of a correction factor representing the initial settlement occurring prior to the addition of the municipal solid waste layers. This modification resulted in a decrease in the difference between estimated and actual settlement values, from 17% to 24% based on the Sowers equation model to below 5% using the proposed modified settlement model.

Analysis of Potential RDF Resources from MSW Landfills in Major Cities of Indonesia

“…In Bali's dumps, for example, the volatile level was at 67.86% (Widyarsana et al, 2021). Furthermore, the Bandung landfill's explosive level was 78.72% (Hadinata et al, 2018). The waste samples at the three research sites could be directly processed into RDF using the combustible method since this study's volatile level was 50-70%.…”

Paper Components Effect on Hydraulic Characteristics of Biodegradable Municipal Solid Waste

“…The high compressibility of Indonesian MSW, describe the low density of MSW layer in Indonesian landfill, related to high moisture and high organic matter contents (Hadinata et al, 2018), so the effect of paper components in increasing the dry density of MSW and slows down the entry of water into landfills (due to smaller permeability) becomes important and needs to be studied further. If there is a possibility of loss of paper components in landfill, for example by recycling activities, reduced density (and stability) is probable, especially for fresh waste on the top layer of the landfill.…”

Analytical Modelling of MSW Landfill Surface Displacement Based on GNSS Monitoring

“…Although the Sowers model is the most commonly used in practical aspects, Hadinata et al [37] made an attempt to modify the Sowers (1975) formula by adding a correction factor representing the initial settlement occurring prior to the addition of waste layers. Proposed modification resulted in a decrease in the difference between estimated and actual settlement values, from 17-24% to below 5%.…”