M Kennyzyra^[1]* and M A Hadi¹

¹ Department of Civil Engineering, University Islam Indonesia, Yogyakarta, Indonesia

[1]^* Corresponding author’s email: [email protected]

DOI: https://doi.org/10.20885/icsbe.vol4.art26

ABSTRACT

Application of signalling at junction can make the delay time longer. The delay time at the junction will be related to the amoun^Zt of fuel consumption of vehicles. In this study, research will be conducted on delays with fuel consumption at the Degolan Junction. The purpose of this study was to determine the comparison of vehicle fuel consumption between the unsignalized junction and signalized junction. Junction performance analysis was carried out based on IHCM 1997. The fuel consumption analysis is carried out based on the length of the delay using the equation from LAPI-ITB. Furthermore, data analysis was carried out using linear regression analysis. Based on the results of the analysis, it was found that the average fuel consumption at the Degolan Junction when the junction conditions were not signalled was 9.553 liters/junction. Meanwhile, when signalling is applied to the Degolan junction with details, alternative 1 produces an average fuel consumption of 40,144 liters/ junction, alternative 2 produces an average fuel consumption of 40,646 liters/ junction, and alternative 3 produces an average fuel consumption of 39,937 liters/junction. The results of the analysis show that the performance of the junction in the form of delay has an influence on fuel consumption.

Keywords: fuel consumption, intersection, delay time

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D Wulandari^1*, R Rosita², A F Maulana³, I Mansur⁴, Kasam^[1]

¹ Department of Environemntal Engineering, Faculty of Civil Engineering and Planning, Universitas Islam Indonesia, Yogyakarta, IndonesiaJl Kaliurang KM 14, 5 Yogyakarta, Indonesia. 55584

² SEAMEO BIOTROP, Jl Raya Tajur Bogor 16134, Indonesia

³ Department of Bioresources Technology and Veterinary, Vocational College, Universitas Gadjah Mada, Gedung SV UGM, Sekip Unit 1, Depok Sleman Yogyakarta 55281, Indonesia

⁴  Faculty of Forestry, IPB University, Dramaga Bogor 16680, Indonesia

^[1]* Corresponding author’s email: [email protected]

DOI: https://doi.org/10.20885/icsbe.vol4.art24

ABSTRACT

Tin mining is one industry that contributes to Indonesia’s economic development. However, because tin is always in high demand, this activity creates an environmental problem. Silica sand, the dominant soil in post-tin mining, is easily eroded by water and wind, resulting in soil nutrient deficiency including N. Because this condition makes it difficult for organisms to survive, rehabilitation is essential. Nitrogen (N) is an essential nutrient for plant growth. N-fixing rhizobacteria are well-known for fixing N from the atmosphere, whether through symbiosis or otherwise. The goal of this study was to isolate indigenous N-fixing rhizobacteria from a post-tin mining area. The soybean plant was used as the testing plant. Three types of N-fixing rhizobacteria were isolated from the nodule of Acacia mangium growing in a post-tin mining area: B1, B2, and B3. To minimize the nutrient content in the growth media, the plant was grown in sterilized sand. Inoculated and non-inoculated soybean were grown in a greenhouse for three months without fertilizer. There were seven replications. Among the treatments, B3 had the highest soil and pod N content, best growth performance, nodule formation, and soybean production. This finding suggests that B3 could be used for future rehabilitation in the post-tin mining area.

Keywords: post-tin mining, rehabilitation, rhizobacteria. N deficiency

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F M Iresha^1*, Kasam¹, D S Nuramadhani¹, A Rahmat²

¹ Program Studi Teknik Lingkungan, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia, Yogyakarta

² Badan Riset dan Inovasi Nasional, Indonesia

^{[1] *}Corresponding author’s email: [email protected]

DOI: https://doi.org/10.20885/icsbe.vol4.art22

ABSTRACT

Final Disposal Site (FDS) which is a place that is produced from landfills or the final stage in waste processing. Gunung Tugel FDS which is located in Kedungrandu Village, Patikraja District, Banyumas Regency has a source of waste originating from settlements, markets, shops and also industry of 260 m3/day. The existing facilities at the Gunung Tugel FDS have not been maximized because they use the open dumping method, namely the discarded waste is allowed to accumulate without any further processing other than that there is no leachate or leachate disposal. Leachate that is not treated can infiltrate into the ground and contaminate the surrounding groundwater. The study was conducted to determine the concentration of heavy metals Zinc (Zn) and Chromium (Cr) in the hair of the community around the Gunung Tugel FDS, Banyumas Regency and analyze the relationship between length of stay, source of drinking water consumption and the amount of drinking water consumption with heavy metal content in the community around the Gunung Tugel FDS, Banyumas Regency. The number of samples was determined using the distance of residence from the FDS, namely 16 samples. The distance used has 4 retrieval points and 4 repetitions which are at a distance of 500 meters, 1000 meters, 1500 meters and 2000 meters. The results of the analysis of the concentration of Zn in the hair of the people around the Gunung Tugel FDS reached 85.52 – 339.64 µg/g and the concentration of Cr in the sample was in the range of 1.8±0.3 ppm. At point 1 the average concentration obtained is 609.87 mg/kg, this shows that the closer the distance, the faster the exposure to heavy metals produced by the landfill.

Keywords: Heavy Metal, exposure, disposal

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