Performance of Lagoon Ash As Bottom Liner in MSW Landfill

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Proper management of Municipal Solid Waste dumping in landfill site require adequate bottom liner to mitigate the seepage of leachate from contaminating the ground. To make landfill system sustainable, adequate liners are provided at the bottom of engineered landfill system. Liners act as impermeable cover mitigating effect of leachate on ground and groundwater. Pond ash collected from lagoon of thermal power plant is a preferable building material for municipal solid waste impounding system if properly stabilized and compacted. To meet the mandatory requirement of landfill liner having permeability 10-7 cm/sec or less, detailed experimental study was carried out on pond ash collected from Nalco Captive Power Plant, Angul, India. The parameters Unconfined Compressive Strength (UCS) and coefficient of permeability (K) were determined by conducting the laboratory experiments following Indian standard code procedure for all the mixes as stated in Table 1. Experimental results of UCS test were found to increase the strength upto 5.4 MPa for S3 mix sample after curing period of 180 days. It was further observed that for the sample S7 mix the strength reached upto 6.9MPa which was due to the binding effect of 1% gypsum in the mix. The hydraulic conductivity value of stabilized Pond Ash came down to 10-7 cm/sec after 180 days of curing period even after acid and base permeation. It was observed from R square value established for all sample mixes of pond ash that a strong linear correlation existed between curing time and UCS value. The strength and permeability results clearly indicate that pond ash, stabilized with optimum mix of lime-gypsum satisfies both Environmental Protection Agency (U.S) and Central Pollution Control Board (India) guidelines for landfill liner. Hence lime and gypsum stabilised pond ash is proved to be an effective eco-friendly material adhering to the requirements of landfill bottom liner for MSW engineered landfill system.




Bose, B., Chand, S. K., & Maharana, M. (2022). Performance of Lagoon Ash As Bottom Liner in MSW Landfill. International Journal of Recent Technology and Engineering (IJRTE), 11(3), 11–20.

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