RETNO HIDAYATI, TITIS and NUR PRAMUKTI NUGROHO, ZULFA (2025) OPTIMAL SITE PLANNING OF BIODIGESTER BASED AT 3R WASTE PROCESSING SITE THROUGH ANALYTICAL HIERARCHY PROCESS (AHP) AND GEOGRAPHIC INFORMATION SYSTEM (GIS) ANALYSIS IN SEMARANG REGENCY. Undergraduate thesis, Universitas Diponegoro.

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Abstract

ABSTRACT
Rapid population growth in Semarang Regency has increased waste
generation, while new landfill development is often rejected due to high costs and land needs. Waste management remains suboptimal, with most waste directly disposed of at landfills. The Blondo landfill reached 52.23% capacity in 2022 and 51.97% in 2023. Waste reduction efforts through waste banks only target inorganic
waste, despite 73.14% of total waste being organic. Implementing 3R waste processing facilities (3R WPS) with biodigester technology offers a strategic solution to reduce waste and generate renewable energy. Biodigesters are chosen for their ability to convert organic waste into energy. The placement of biodigester facilities considers technical, social, and environmental aspects using the Analytical
Hierarchy Process (AHP) and Geographic Information System (GIS) methods. Data collection is carried out based on SNI 3964:2025 and the gravimetric method to measure volatile content, in order to determine the potential of organic waste and the number of facilities needed. Organic waste in Semarang Regency accounts for
56.1% of total waste generation. Based on the analysis results, the volatile solid content reached 96.26% and the total solid content was 34.65%, making it suitable for use as raw material for biodigesters. The GIS analysis results showed that 20 biodigester facilities were needed, with a potential electricity production of 724 kWh per day for large-scale 3R waste management sites and 379 kWh per day for
small-scale 3R waste management sites. The total cost of constructing a 3R WPS with a biodigester facility is estimated at IDR 4,836,980,790.65 for a large scale and IDR 3,681,719,032.98 for a small scale. Based on a financial feasibility analysis using the Net Present Value (NPV), Economic Internal Rate of Return (EIRR),
Benefit Cost Ratio (BCR), and Payback Period methods, the WPS 3R project, designed to operate for 20 years, is deemed feasible for implementation.
Keywords: Analytical Hierarchy Process; Geographic Information System; Biodigester; Renewable Energy; Organic Waste

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