THE EFFECT OF VARIATION OF FRESH WASTE RATIO ADDED ONTO THE DRYING OF LANDFILL MINING WASTE THROUGH BIODRYING AND SOLAR GREENHOUSE BIODRYING PROCESS AS PRE-TREATMENT FOR REFUSE DERIVED FUEL (RDF)

• Main Author: Sevina, Raisa
• Format: Theses
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/70873
• Institution: Institut Teknologi Bandung

In 2020, TPA Talang Gulo site 1 which has been operated in Jambi City since 1997 was officially closed due to overcapacity. About 350 tons of waste goes to TPA per day. As much as 80% of the total treated waste in Jambi is transported to TPA due to low level of waste treatment at source (12% is managed by formal and informal sector processing facilities, the rest is untreated properly). Currently, municipal waste disposal has shifted to new landfill at site 2. However, because the level of sorting and composting at the landfill is still not optimal, more than 95% of the waste goes to landfill. It can decrease the age of the landfill faster than it should be. According to Massarutto (2012), in densely populated areas it will be difficult to get new landfill land that complies with regulations. Aside from limited land, landfills also have the potential to cause pollution and reduce the carrying capacity of the environment. Old landfills, which have not had modern environmental technology, are a source of local pollution due to leaching of hazardous compounds (Flyhammar, 1997). So that in this study carried out landfill mining activities to utilize old landfill excavated waste as material and energy. Mining was carried out at depths of 3, 5 and 7 meters with an estimated sample age of more than 9 years. The composition of excavated waste consists of 49.94% plastic, 0.13% paper/cardboard, 2.36% textile, 0.71% glass, 0.52% rubber, 0.69% metal, 17.12% garden waste, soil-like material 26.35% and others 1.88%. with sample size dominated by particles <38.1 mm (61,7%). The landfill samples contained 55.6- 66.2% water content, 50.3-80.6% volatile content, 19.4-49.7% ash content, 2.6- 4.2% fixed carbon and 5.1-7.1 MJ/kg calorific value. The soil-like material had 55,6-61,2% water content and 26.8-32.7 C/N ratio. The landfill waste can be utilized as a recycling material of 6,402 tons, compost/cover soil production of 120,478 tons and RDF production of 320,415 tons. Furthermore, to obtain RDF characteristics that meet the standards, drying of excavated waste is carried out with various drying methods and waste composition ratios. These methods are greenhouse biodrying and solar greenhouse biodrying (SGB) method were applied, with the ratio of landfill waste to the addition of fresh waste is 1:0, 1:1, 1:2, 1:3, and 1:4. The SGB method reduced water content by 27-62.2% with a lower calorific value of 7,5-14 MJ.kg. Meanwhile, the biodrying method reduced water content of 9-29.1% with a lower calorific value of 5-6,8 MJ/kg. Based on SNI 8966-2021, piles that meet the standard of water content value for RDF class 3 are pile B1, while piles that meet the calorific value standards of RDF are piles B1 and B3. Based on the statistical analysis, it is known that the drying method has a significant effect on the water content, while the drying ratio also has a significant effect on the water content in the greenhouse biodrying system without solar but has no significant effect on the water content in the SGB system. This is because in SGB there are two factors that play a role in drying, namely heat caused by sunlight and exothermic heat produced by the activity of microorganisms. The most optimum drying variation is the SGB system with a ratio of 1:0 (pile B1).