Feasibility Study for Mining Waste Materials as Sustainable Compost Raw Material Toward Enhanced Landfill Mining
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Department of Environmental Engineering, Universitas Diponegoro, Semarang 50275, Indonesia
Department of Industrial Engineering, Universitas Diponegoro, Semarang 50275, Indonesia
Department of Life and Environment Engineering, Faculty of Environmental Engineering, The University of Kitakyushu, Fukuoka 808-0135, Japan
Master of Environmental Engineering, Universitas Diponegoro, Semarang 50275, Indonesia
Environmental Sustainability Research Group, Universitas Diponegoro, Semarang 50275, Indonesia
Submission date: 2022-07-20
Final revision date: 2022-12-18
Acceptance date: 2022-12-28
Online publication date: 2023-02-23
Publication date: 2023-04-14
Corresponding author
Mochamad Arief Budihardjo   

Department of Environmental Engineering, Faculty of Engineering, Universitas Diponegoro Jl. Prof. H. Sudarto, SH Tembalang, Semarang, Indonesia, 50275, Indonesia
Pol. J. Environ. Stud. 2023;32(3):2323-2335
Semarang, the capital of Central Java, had a population of 1,814,100 in 2019. City’s Jatibarang landfill waste dump was expected to close in 2021. This dump can be rehabilitated by mining the backfill and utilizing mining materials. Herein, a mining feasibility study was conducted to examine the environmental, technical, and financial aspects to determine the condition of the waste dump zone. The environmental feasibility was evaluated using the integrated risk basic approach (IRBA); the technical feasibility was analyzed by conducting laboratory tests and determining the appropriate technology for processing fine materials; and the net present values (NPV), payback period (PP), and internal rate of return (IRR) were calculated for financial feasibility analysis. The total waste heap in zones 1 and 2 was 2,444,700 m3, with a fine material composition of 56% and density of 738.05 kg/m3. IRBA analysis results indicated a moderately hazardous dump. Thus, this dump can be rehabilitated via landfill mining. The fine material can be converted to granular organic fertilizer for use in the petrochemical industry. Overall, landfill mining is financially feasible, with a NPV value of IDR 11,126,547,566>0, IRR 33%>9.86%, and PP of seven years<planning year.
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