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All Journal CogITo Smart Journal Journal Dynamic SainT International Journal of Environmental, Sustainability, and Social Science
Andrea Stevens Karnyoto
Bioinformatics And Data Science Research Center Bina Nusantara University, Indonesia
Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation

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Redesigning the Element Profile of Air Preheater in Coal-fired power plants for Emission Reduction and Efficiency Improvement SUSILO, Sofiyan Dwi; TRISTANTO, Andhika Dwipradipta; PRASETYA, Wahyu; ICHWAN, Munirul; SIHOTANG, Fernando; INTAN, Indo; KARNYOTO, Andrea Stevens
International Journal of Environmental, Sustainability, and Social Science Vol. 5 No. 3 (2024): International Journal of Environmental, Sustainability, and Social Science (May
Publisher : PT Keberlanjutan Strategis Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38142/ijesss.v5i3.1082

Abstract

PT PLN Nusantara Power Unit Pembangkit Tanjung Awar-Awar (UPTA) is a state-owned company that supplies electricity to areas of Java and Bali. Using coal as the main fuel, UPTA currently has two mills that each has capacity of 350 MW in coal-fired mode. Since the last few years, UPTA has been focusing on bringing efficiency into its overall operations, maximizing efforts for an improved output, modernizing machinery, and reducing emissions. After conducting routine inspection and examinations, UPTA decided to improve the air preheating element, so-called air preheater (APH), as an enabling condition to heat both the primary and secondary air to a temperature required for effective combustion in a boiler. To seek for an optimal APH, a redesign project was initiated to primarily change the element profile from a distorted wavy flow path to a linear flow path. The profile surface was coated with an added "enamel" layer, which prevents ash from adhering readily. Our measurements and calculations were based upon the data collected in October 2022 (pre- implementation) and within the periods of February to June 2023 (post-implementation). As a result, the average power consumption was reduced: from over 1740 kWh per month to become around 1377 - 1535 kWh per month, or 11% - 21%, for the induced draft fan (ID Fan) and from over 1900 kWh per month to become around 1450 - 1542 kWh per month, or 19% - 29%, for the primary air fan (PA Fan).
Karst Ecosystem Restoration in the Nglirip Cave Nature Reserve with Endemic Plants Andrea Stevens KARNYOTO; Yunan KURNIAWAN; Rahayu Eka SARI; Nauvani Rahma ILAHI; Citra Asmo MARDHIATI; Asharviyan Ridzky HERMAWAN; Munirul ICHWAN; Charnia Iradat RAPA; Indo INTAN
International Journal of Environmental, Sustainability, and Social Science Vol. 6 No. 4 (2025): International Journal of Environmental, Sustainability, and Social Science (Jul
Publisher : PT Keberlanjutan Strategis Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38142/ijesss.v6i4.1581

Abstract

The karst ecosystem of the Nglirip Cave Nature Reserve in Tuban Regency, East Java, plays a vital role as a water reservoir, carbon sink, and biodiversity hub. However, uncontrolled deforestation and human activities have disrupted the ecological balance, threatening the flora and fauna, as well as the local groundwater reserves. This study documents a collaborative restoration program initiated by PT PLN Nusantara Power Unit Pembangkit Tanjung Awar-Awar (UPTA), in partnership with the East Java BBKSDA (National Resources Conservation Agency) and the Tuban Regency Environmental Agency. The program aimed to rehabilitate the karst ecosystem through the planting of 1,000 endemic trees, which are Ficus benjamina and Ficus macrocarpa. These trees were chosen for their high-water absorption capacity and ecological suitability to the Nglirip Cave Nature Reserve. We implemented an innovative protection technique called “Ficus in Shield” by constructing cylindrical galvanized sheet metal under the tree trunks. This procedure was implemented to protect the saplings from damage by porcupines. The results show a measurable increase in biodiversity, evidenced by an increase in the Shannon-Wiener Biodiversity Index, and are expected to improve groundwater retention and ecosystem resilience. Beyond the ecological benefits, this initiative emphasizes the importance of public-private collaboration in biodiversity conservation and climate resilience. These findings highlight that endemic-based reforestation, combined with adaptive protection methods, is expected to effectively restore longdegraded karst ecosystems and serve as a model for sustainable conservation both in the Nglirip Cave Nature Reserve and elsewhere.
Karst Ecosystem Restoration in the Nglirip Cave Nature Reserve with Endemic Plants Andrea Stevens KARNYOTO; Yunan KURNIAWAN; Rahayu Eka SARI; Nauvani Rahma ILAHI; Citra Asmo MARDHIATI; Asharviyan Ridzky HERMAWAN; Munirul ICHWAN; Charnia Iradat RAPA; Indo INTAN
International Journal of Environmental, Sustainability, and Social Science (IJESSS) Vol. 6 No. 4 (2025): International Journal of Environmental, Sustainability, and Social Science (Jul
Publisher : PT Keberlanjutan Strategis Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38142/ijesss.v6i4.1581

Abstract

The karst ecosystem of the Nglirip Cave Nature Reserve in Tuban Regency, East Java, plays a vital role as a water reservoir, carbon sink, and biodiversity hub. However, uncontrolled deforestation and human activities have disrupted the ecological balance, threatening the flora and fauna, as well as the local groundwater reserves. This study documents a collaborative restoration program initiated by PT PLN Nusantara Power Unit Pembangkit Tanjung Awar-Awar (UPTA), in partnership with the East Java BBKSDA (National Resources Conservation Agency) and the Tuban Regency Environmental Agency. The program aimed to rehabilitate the karst ecosystem through the planting of 1,000 endemic trees, which are Ficus benjamina and Ficus macrocarpa. These trees were chosen for their high-water absorption capacity and ecological suitability to the Nglirip Cave Nature Reserve. We implemented an innovative protection technique called “Ficus in Shield” by constructing cylindrical galvanized sheet metal under the tree trunks. This procedure was implemented to protect the saplings from damage by porcupines. The results show a measurable increase in biodiversity, evidenced by an increase in the Shannon-Wiener Biodiversity Index, and are expected to improve groundwater retention and ecosystem resilience. Beyond the ecological benefits, this initiative emphasizes the importance of public-private collaboration in biodiversity conservation and climate resilience. These findings highlight that endemic-based reforestation, combined with adaptive protection methods, is expected to effectively restore longdegraded karst ecosystems and serve as a model for sustainable conservation both in the Nglirip Cave Nature Reserve and elsewhere.
Co-Authors Asharviyan Ridzky HERMAWAN Charnia Iradat RAPA Citra Asmo MARDHIATI ICHWAN, Munirul Indo Intan Indo INTAN Muhammad Agus Muljanto Munirul ICHWAN Nauvani Rahma ILAHI PRASETYO, Arif Eko Rahayu Eka SARI Sihotang, Fernando SUSILO, Sofiyan Dwi TRISTANTO, Andhika Dwipradipta Wahyu Prasetya, Wahyu Yunan KURNIAWAN