Redesign of Leachate Treatment Plant of Selopuro Landfill in Ngawi Regency East Java

• Main Author: Isyarani, Destiana
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/36834
• Institution: Institut Teknologi Bandung

Selopuro landfill is located in Selopuro Village, Pitu District, Ngawi Regency. Selopuro landfill began operations since 1995 and began operating in a sanitary landfill since 2015. The service area of the Selopuro landfill is a sub-district of Ngawi consisting of 12 villages and 4 sub-sub-districts. Selopuro land has an existing leachate treatment plant which is stabilization ponds. This series of stabilization ponds consists of anaerobic ponds, facultative ponds divided into 3 cells, maturation ponds divided into 3 cells, and constructed wetland. This leachate treatment plant produces effluent which exceeds the quality standard of Peraturan Menteri Lingkungan Hidup dan Kehutanan RI Nomor 59 tahun 2016, namely the BOD parameter of 945 mg / l, COD of 3050 mg / l, TSS of 250 mg / l, and Nitrogen Total of 129.5 mg / l. Based on the Thorntwaite method, the leachate discharge produced was 0.14 liters/second or 0.28 liters/second/hectare. Therefore it was redesigned by utilizing existing processing plants. Redesign is done by adding surface aerators to facultative ponds with a power of 1.5 hp in the first cell and 0.5 hp in the second and third cells and increasing the elevation of the maturas pond datum by adding a concrete plate so that the depth becomes 1.5 m and replacing the soil media and wetland vegetation. This upgrade results in BOD removal efficiency of up to 99%. The budget plan required for this redesign is Rp.500,973,446.30 with operational costs of Rp.22,984,090.23, per year. Additional recommendations proposed is the need to build a recirculation system towards landfill to handle fluctuations in leachate quality and maintenance of ponds