Optimization of Conditions of Digested Sludge Using Landfill Biocover Material for Enhance Methane Oxidation

Abstract:

The modified digested sludge (MDS) can be used as landfill biocover that serve to minimize CH₄ emissions by optimizing CH₄ oxidation. MDS composited by coal ash and digested sludge was studied in this paper. The permeability coefficient and the compressive strength of MDS were tested in full factorial L₉(3⁴) experiment using simulation column. Results show that when the mix ratio of coal ash and digested sludge is about 1:1-1.5:1, the permeability coefficient < 10^-4 cm/s and compressive strength 50 kPa, MDS can meet the engineering requirements for landfill operation. The optimal conditions of MDS were as follow: mix ratio of coal ash/digested sludge = 1:1, nutrient solution = 0.05 ml/g, thickness of biocover = 400mm, and moisture content of MDS = 40%. The maximum CH₄ oxidation efficiency was 88.6% and the volume flow rate of CH₄ was 0.75 mmol/(kgd) under the optimal conditions.

• Periodical: Advanced Materials Research (Volumes 838-841)
• Pages: 2797-2801
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.838-841.2797
• Online since: November 2013
• Authors: Ling Zhao, Xiao Gu Cheng, Jun Chang Suo, Ping He Yin*
• Keywords: Coal Ash, Digested Sludge, Landfill Biocover, Methane Oxidation

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