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All Journal J-Sil (Jurnal Teknik Sipil dan Lingkungan)
Shofi Latifah Nuha Anfaresi
IPB University
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Environmental Science Transportation

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Evaluation of Waste Containment and Collection at Dramaga Campus, IPB University Joana Febrita; Jihan Nur Azizah; Zainab Ramadhanis; Shofi Latifah Nuha Anfaresi; Handito Rahman; Rasendriya Arkananta Bhanu Loppies; Naila Fauzia Arwen; Indana Atqiya Kamila
Jurnal Teknik Sipil dan Lingkungan Vol. 11 No. 1: April 2026
Publisher : Departemen Teknik Sipil dan Lingkungan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jsil.11.1.23-32

Abstract

Effective waste management at university campuses requires systematic evaluation of containment systems and collection operations. This study assessed waste generation, containment conditions, and collection practices at Dramaga Campus, IPB University, Indonesia. Waste sampling was conducted over eight days at 40 collection points across academic, dormitory, general facility, and canteen zones, following SNI 19-3964-1994. Waste at Taman Semangat Integrated Waste Management Facility (TPST) was sampled on two additional days. Total daily waste generation averaged 3.25 tonnes, yielding a per capita generation rate of 0.13 kg/person/day, which is below the global average for higher education institutions (0.19–0.21 kg/person/day). Organic waste dominated all source zones (39–66% by weight), followed by plastic (17–44%) and paper (10–25%). Waste containment relied on two container types—concrete and plastic—classified as communal containers. Evaluation against SNI 19-2454:2002 revealed multiple non-conformities: absence of waste segregation at source, inconsistent container placement, and underutilized containers at peripheral sites. Waste collection follows a Stationary Container System operated by two colour-coded trucks across two daily shifts. The existing fleet of two active trucks requires a total of five trips per day to remove all generated waste, but the current schedule is insufficient to fully serve all sites daily. Recommendations include spatial redistribution of containers, enforcement of source segregation, and expansion of collection capacity.
Hydraulic-Thermal Evaluation and Maintenance Prioritization for a District Geothermal Network in Berkeley, California Shofi Latifah Nuha Anfaresi; Yulia Nugroho; Nanthaya Verweij
Jurnal Teknik Sipil dan Lingkungan Vol. 11 No. 1: April 2026
Publisher : Departemen Teknik Sipil dan Lingkungan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jsil.11.1.65-76

Abstract

District geothermal systems require reliable and efficient pressurized circulation and limited thermal dissipation in buried piping, yet design studies often report hydraulic or thermal behavior separately and rarely translate results into maintenance priorities. This study develops a one-way hydraulic-thermal screening workflow aiming to enhance the geothermal energy sustainability by designing a cyber-physical systems baseline. In the district closed-loop geothermal network, EPANET was used to model the full pressurized hydraulics system, while the heat-transfer calculation was evaluated separately from heat loss and heat exchange, coupled with hydraulic values. The operating cases used in the system is a 42-node, 40-pipe network with three 350 HP pumps, and an elevation range of 70-116 m. Outputs from EPANET, including link flow, velocity and head values were then exported to a separate steady heat loss calculation based on radial heat transfer under a uniform supply-return screening scenario. The methodological novelty in this study is the explicit combination of EPANET hydraulics with pipe-level heat-loss screening to investigate maintenance-critical pipes in a closed-loop geothermal network, rather than only reporting system operating metrics. The simulations indicate daily pumping energy of 17,896.8 kWh under the assumed work cycle with hydraulically acceptable velocities of approximately 3-5 fps. The average heat loss in the system is at around 0.0357 kWh/day with almost half of the system’s pipes are pipes with heat loss values above average and considered critical. These pipes are the overheat pipes with wider diameter and mostly considered as main transmission pipes in the geothermal system loop. The use of enhanced insulated pipes and automated sensing devices installations in these critical pipes in the geothermal construction plan would create a significant contribution towards the operation and maintenance work and overall system’s sustainability. This result is interpreted as a design-stage decision-support screen rather than a bankable estimate of lifecycle sustainability gains.
Co-Authors Handito Rahman Indana Atqiya Kamila Jihan Nur Azizah Joana Febrita Naila Fauzia Arwen Nanthaya Verweij Ramadhanis, Zainab Rasendriya Arkananta Bhanu Loppies Yulia Nugroho