DESIGN OF INTEGRATED WASTE TREATMENT PLANT (TPST) IN BATUJAJAR DISTRICT, WEST BANDUNG REGENCY

• Main Author: Dui Oktavianto, Alif
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/80268
• Institution: Institut Teknologi Bandung

The waste management currently implemented in West Bandung Regency involves the collection-transport-disposal method, with waste disposal services limited to only 9 out of the total 16 districts in West Bandung Regency. Among the 9 districts receiving services, only urban areas are covered, while in rural areas, waste is handled by burning, burying, or dumping in open areas or rivers. Household and similar waste from West Bandung Regency are disposed of at the Sarimukti Landfill, which is currently overcapacity. Therefore, West Bandung Regency, with the financial support of the World Bank, plans to construct an Integrated Waste Processing Facility (TPST) to reduce waste in the region. This facility is planned to be built in the Batujajar District, East Batujajar Village. The design involves sampling waste generation in the Batujajar District based on the community's income level. The results of waste sampling show average total weight, volume, and density of waste per person per day at 0.30 kg, 0.0022 m3, and 137.40 kg/m3, respectively. Organic waste constitutes the largest portion at 53.60%, with plastic waste as the second-highest at 20.87%. Organic waste, mainly food waste, will undergo composting due to its C/N ratio of 11.23%. Mixed waste, including food waste, wood, leaves, paper, cardboard, rubber/leather, fabric/textiles, and plastic, will be processed using RDF technology due to its high calorific value of 3053.38 kcal/kg. To determine the processing technology at TPST, alternative methods for composting and RDF are considered. Composting alternatives include windrow composting, block systems, and vermicomposting. RDF processing alternatives include bio drying, thermal drying, and solar drying. The selection of technology is further determined using the Simple Additive Weighting (SAW) method, resulting in windrow composting for composting due to its ability to produce high-quality compost with a large loading capacity and bio drying for RDF processing because of its capacity to reduce water content by up to 50%. To establish the design requirements, future waste quantities over twenty years are projected using exponential methods, estimating around 85 tons/day entering TPST, with reduction targets at the source and service levels of 30% and 100%, respectively. The vi required costs for building TPST East Batujajar and land acquisition amount to Rp10,585,000,000 or Rp1,070,598/m2, with an annual operational cost of approximately Rp1,600,077,900 or Rp51,574/ton. Revenue from RDF product sales, compost, and fees are projected to be Rp10,060,460,000 for the highest scenario and Rp5,030,230,000 for the lowest scenario. Therefore, considering the Net Present Value (NPV) over 20 years, the project is economically viable, with a positive NPV of Rp105,586,497,119 for the highest scenario and Rp46,700,709,610 for the lowest scenario.