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Analisis Pengaruh Variasi Debit Air (QL) dan Debit Gas (QG) terhadap Koefisien Transfer Oksigen (KLa) pada Performa Microbubble Generator Mistoro, Niesa Hanum; Saraswati, Sri Puji; Ahmad, Johan Syafri Mahathir; Wiratni, Wiratni
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

Show Abstract | Download Original | Original Source | Check in Google Scholar

The domestic wastewater treatment plant is usually installed using anaerobic system which has the disadvantage for low conversion process and large volume required. While the effectiveness of aerobic system can be increased by high consumption of energy to supply the oxygen. This study investigates the performance of Microbubble Generator (MBG) for wastewater treatment. The MBG utilizes the hydrodinamics of wastewater flow in the nozzle to provide energy-saving aeration. In this study, the clean water non-steady state test method was selected to find the overall oxygen transfer coefficient (KLa). The experiment was conducted by increasing the concentration of Dissolved Oxygen (DO) using MBG installed with submersible pump (water discharge, QL=80 l/min) and variations of gas discharge (QG) (0.15 l/min and 0.30 l/min). The KLa average results on QL 80 l/min at QG 0.15 l/min showed 0.01996/min and at QG 0.30 l/min showed 0.02564/min. These results indicate that the greater gas discharge (QG) can produce a greater KLa value. This happens because the more air is injected into the water and forms into micro-sized bubbles, the greater the rate of transfer oxygen to the liquid phase.

Evaluasi dan Pengembangan Jaringan Distribusi Air Minum di PDAM Tirta Bhagasasi: Studi Kasus Cabang Babelan dan Cabang Sukatani: indonesia Mistoro, Niesa Hanum; Yulianto, Andik; Wantoputri, Noviani Ima
Asian Journal of Innovation and Entrepreneurship Volume 09, Issue 03, September 2025
Publisher : UII

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ajie.vol9.iss3.art1

Rapid population growth in the Babelan and Sukatani areas of Bekasi Regency has significantly increased the demand for clean water, posing a challenge for PDAM Tirta Bhagasasi in maintaining a reliable and sustainable drinking water supply. This study aims to evaluate the performance of the existing water distribution network and propose an optimized development plan to meet projected demand through 2041. The methodology includes population and water demand projections, evaluation of Water Treatment Plant (WTP) capacity, hydraulic simulation using EPANET 2.0, and cost estimation for network development. The results show that by 2041, the population in Babelan and Sukatani is projected to reach 418,390 and 149,700 people respectively, with corresponding water demands of 481.8 L/s and 172.5 L/s. The existing WTP capacities are insufficient, particularly in Sukatani, which currently operates at only 44 L/s. Hydraulic simulation indicates that a looping distribution system is more effective than a branching system in improving water pressure and reducing losses. However, implementing a looping system requires a higher investment, estimated at approximately IDR 15 billion, compared to IDR 10 billion for a branching system. Given these findings, the study recommends that PDAM Tirta Bhagasasi prioritize increasing WTP capacity and adopt a looping-based distribution network to ensure long-term service reliability, particularly in high-growth areas. This approach offers both technical and economic benefits for future water supply planning and can serve as a model for other regions facing similar challenges.

Analisis Pengaruh Variasi Debit Air (QL) dan Debit Gas (QG) terhadap Koefisien Transfer Oksigen (KLa) pada Performa Microbubble Generator Mistoro, Niesa Hanum; Saraswati, Sri Puji; Ahmad, Johan Syafri Mahathir; Wiratni, Wiratni
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

Show Abstract | Download Original | Original Source | Check in Google Scholar

The domestic wastewater treatment plant is usually installed using anaerobic system which has the disadvantage for low conversion process and large volume required. While the effectiveness of aerobic system can be increased by high consumption of energy to supply the oxygen. This study investigates the performance of Microbubble Generator (MBG) for wastewater treatment. The MBG utilizes the hydrodinamics of wastewater flow in the nozzle to provide energy-saving aeration. In this study, the clean water non-steady state test method was selected to find the overall oxygen transfer coefficient (KLa). The experiment was conducted by increasing the concentration of Dissolved Oxygen (DO) using MBG installed with submersible pump (water discharge, QL=80 l/min) and variations of gas discharge (QG) (0.15 l/min and 0.30 l/min). The KLa average results on QL 80 l/min at QG 0.15 l/min showed 0.01996/min and at QG 0.30 l/min showed 0.02564/min. These results indicate that the greater gas discharge (QG) can produce a greater KLa value. This happens because the more air is injected into the water and forms into micro-sized bubbles, the greater the rate of transfer oxygen to the liquid phase.

Strategi Infrastruktur Hijau dalam Mendukung Ketahanan Lingkungan Perkotaan di Kawasan Historis Baciro, Yogyakarta: indonesia Mistoro, Niesa Hanum; Yulianto, Andik; Rahmawati, Suphia; Putro, Muhammad Kholif Lir Widyo
Asian Journal of Innovation and Entrepreneurship Volume 10, Issue 1, January 2026
Publisher : UII

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ajie.vol10.iss1.art5

Many urban cities in Indonesia face critical challenges such as limited green open spaces, declining environmental quality, and spatial pressure driven by rapid population growth. These conditions threaten urban environmental resilience, particularly in maintaining quality of life and sustainable resource use. This study aims to formulate adaptive green infrastructure planning strategies for the Baciro historical neighbourhood in Yogyakarta to enhance environmental quality while preserving the area’s cultural identity. A qualitative case study approach was employed, combining spatial planning documents, field observations, and stakeholder interviews. The findings indicate that despite limited open spaces, Baciro offers significant opportunities for green infrastructure development through the utilization of residual and vertical spaces, including narrow alleys, riverbanks, and commercial building façades. Proposed strategies include the implementation of vertical gardens, green corridors, revitalized riverfronts, and pedestrian-friendly green streets. These interventions contribute ecological functions—such as water infiltration, microclimate regulation, and air quality improvement—while also strengthening social cohesion through community participation. Furthermore, integrating green infrastructure with the Transit Oriented Development (TOD) concept expands its role in promoting sustainable mobility and liveable urban spaces. This research demonstrates that green infrastructure can serve as a strategic instrument for achieving urban environmental resilience while safeguarding historical heritage in the face of urbanization pressures. The results provide insights and practical implications for planning similar historic neighbourhoods across Indonesian cities that encounter comparable spatial and environmental challenges.

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