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All Journal Justek : Jurnal Sains Dan Teknologi AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) International Journal of Research in Vocational Studies (IJRVOCAS) Society: Jurnal Pengabdian Masyarakat Prosiding Seminar Nasional Inovasi Teknologi Terapan Jurnal Inovasi Teknologi Terapan
Daya Wulandari
Politeknik Manufaktur Negeri Bangka Belitung
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Other

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Life Cycle Assessment of Production Bio-oil from Thermal Cracking Empty Fruit Bunch (EFB) Daya Wulandari; Rusdianasari Rusdianasari; Muhammad Yerizam
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 6 No. 3 (2022)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (349.554 KB) | DOI: 10.29165/ajarcde.v6i3.118

Abstract

Empty fruit bunch (EFB) is one of the abundant biomass waste from oil palm and it is an issue that it can be used as renewable energy in the form of Bio-oil. Bio-oil is produced by a thermal cracking process. This research aims to identify the potential environmental impact of Bio-oil production from EFB as fuel. Life Cycle Assessment (LCA) with gate to gate approach is used in data processing applications for networks in Simapro V.9 and the database used is similar to the characteristics of the eco invent database. Functional units are used to show environmental references in impact categories, such as energy used and global warming potency. The results show that the stage of the bio-oil production cycle in the pretreatment process has a greater global warming impact than the others, amounting to 131.10013 kg CO2 eq. The results of the analysis using the networking graph on the Simapri, show that the environmental hotspot of the thermal cracking process for Bio-oil production is caused by the use of electricity from the State Electricity Company (PLN) and the release of chemical substances from the process. From the results of the LCA, environmental performance improvement or continuous improvement can be done is by managing energy use and installing equipment.
Overview of the Utilization of Palm Empty Fruit Bunch (PEFB) as Raw Material for Bioplastic Production Pakpahan, Cindy; Utarina, Leila; Cahyani, Aulia; Moulita, R.A. Nurul; Wulandari, Daya
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 5 No. 3 (2025): IJRVOCAS - December
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v5i3.389

Abstract

This research examines the utilization of Palm Empty Fruit Bunch (PEFB), a byproduct of the palm oil sector, as a sustainable feedstock for bioplastic manufacturing. Bioplastics, derived from natural substances like cellulose, starch, and vegetable oils, offer a sustainable substitute for traditional petroleum-based plastics, which substantially contribute to environmental degradation. This research examines the processes of cellulose extraction, delignification, and the diverse pre-treatment techniques employed to transform PEFB into bioplastics. The findings indicate that PEFB is abundant in cellulose, rendering it a viable material for bioplastic manufacturing. Moreover, the inclusion of plasticizers such glycerol and chitosan enhance mechanical qualities, including tensile strength and flexibility, while preserving biodegradability. The study also emphasizes the influence of various processing conditions and additives on the ultimate attributes of the bioplastic, such as water resistance and mechanical performance. The results indicate that bioplastics sourced from PEFB may aid in diminishing plastic waste and fostering sustainable materials in sectors like packaging. The analysis continues by underscoring the necessity for more research to enhance production techniques and evaluate the scalability of PEFB-based bioplastics in practical applications.
The Effect of Seawater and Sea Sand Composition Ratio on the Characterization of Voltage and Electric Current Riztamala Diana; Daya Wulandari; Putri Afifa Nur Oktadina; Roviu Darojat
Justek : Jurnal Sains dan Teknologi Vol 9, No 1 (2026): March
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v9i1.37799

Abstract

The limited availability of fossil fuels and their environmental impacts have encouraged the development of more environmentally friendly alternative energy sources. One of the methods of renewable energy is to utilize seawater and sea sand. This research aims to analyze seawater and sea sand in generating electrical energy. Source of seawater and sea sand from Tongachi Beach Bangka Belitung Indonesia. The research method was mixing seawater and sea sand with a ratio of 100:0%, 70:30%, 50:50%, 30:70%, dan 0:100%.  Measure the seawater according to the percentage 100%, 70%, 50%, 30% and 0%. Then Weigh the sea sand according to the percentage ratio 0%, 30%, 50%, 70% and 100%.  Add the seawater and sea sand to the mixing container according to the weighed ratio. The electrical energy generated is determined by observing the current flow and power are seen on the multimeter. The results showed that the composition ratio of 100:0 % seawater and sea with a voltage of 0.67 V, an electrical current of 0.2 mA and a power of 0.134 watts. It has of the analysis of the composition of seawater and sea sand can potentially be used as a source of electrical energy.                           
Life Cycle Assessment (LCA) of Biodiesel Production from Coconut Pulp Using In-Situ Transesterification with Microwave Energy Daya Wulandari; Riztamala Diana; Godlove Elioth Kiswaga; Leila Utarina; Devina Sanchia Samosir; Marisa Tri Octavia
Justek : Jurnal Sains dan Teknologi Vol 9, No 2 (2026): June
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v9i2.38010

Abstract

Coconut pulps are solid waste from coconut processing that has had its coconut milk extracted, with a remaining oil content of around 12.2–15.9%. The processing of coconut pulp is not yet optimal, and this waste has the potential to be utilized as renewable energy in the form of biodiesel. Biodiesel is produced through an in-situ transesterification process assisted by microwave energy. This study aims to identify the potential environmental impacts of biodiesel production from coconut pulp as fuel. A Life Cycle Assessment (LCA) was conducted using the cradle-to-gate approach with the SimaPro ver. 9.4.0.3 data processing application and a database similar to the eco-invent database. The environmental impact assessment was analyzed using the EF 3.0 Method (adapted) V1.03 / EF 3.0 normalization and weighting set. The results show that among the stages of the biodiesel production process, the transportation of raw materials and supporting materials has the greatest impact on climate change compared to other stages. The transportation stage contributed 78.19 kg CO₂-eq out of a total of 204.35 kg CO₂-eq in the climate change category and dominated energy resource use at 1108.14 MJ out of a total of 1742.17 MJ. In addition, the preparation stage also contributed significantly to climate change, with emissions reaching 56.21 kg CO₂-eq. The large contribution from the transportation stage was mainly caused by exhaust gas emissions from vehicles used to transport raw materials and supporting materials. Based on the LCA results, environmental performance improvements or continuous improvements that can be implemented include optimizing logistics, regulating fuel use, selecting the nearest sources of raw materials, and improving energy efficiency during the preparation stage to support more sustainable biodiesel production from coconut pulp.
Gamification for Young Learners: Transforming Motivation and English Language Skills through Collaborative-Competitive Learning among Junior High School Students at SMPN 5 Sungailiat- Bangka Belitung Indriati, Titin; Veniati; Daya Wulandari; Riztamala Diana; Mildazani; Endah Arum Wangi; Decky Putra Revo
Society : Jurnal Pengabdian Masyarakat Vol. 5 No. 3 (2026): Mei
Publisher : Edumedia Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55824/5y0kew29

Abstract

The development of digital technology has significantly influenced and changed the current educational practices, particularly language learning and instruction. However, English instruction at the Indonesian junior secondary school level continues to be predominantly teacher-dominated and frequently provides limited opportunities for interactive, student-centered engagement. A mixed-method approach was applied, including classroom observations, student questionnaires, as well as reflective discussions to examine the impact of the program. Purpose of the Study: This community service was designed to improve students’ learning motivation and English language competencies through the application of gamification-oriented collaborative-competitive learning. The program was carried out at SMP Negeri 5 Sungailiat, Bangka Belitung, involving 30 junior high school students participating in a series of interactive digital games, team-based activities, and point-based competitions integrated into English lessons focusing on past tense structures. Methods: A mixed-method approach was applied, including classroom observations, student questionnaires, as well as reflective discussions to examine the impact of the program. Results: The results revealed a significant improvement in students’ learning motivation, classroom participation, and vocabulary development related to past tense usage. The integration of collaborative and competitive gamification elements created a supportive yet dynamic learning environment, encouraging peer interaction while maintaining students’ enthusiasm through healthy competition. Accordingly, the findings indicate that digital gamification constitutes an effective instructional approach for improving English grammar learning among young learners. This study uniquely integrates collaborative-competitive gamification within a community service framework, offering a practical model for grammar instruction in junior high school EFL contexts.
Pengaplikasian Baterai Lithium Ion pada DYE Sensitized Solar Cell (DSSC) dengan Sistem Building Integrated Photovoltaic (BIPV) Rumah Tinggal Daya Wulandari; Riztamala Diana; Leila Utarina; Mitha Pratiwi
Jurnal Inovasi Teknologi Terapan Vol. 4 No. 1 (2026): Jurnal Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/jitt.v4i1.353

Abstract

Solar energy can be converted into electricity using photovoltaic systems as a strategic measure to achieve the renewable energy mix targets outlined in the National Energy Policy. Photovoltaic Rooftop (PV Rooftop) systems integrated with Building Integrated Photovoltaics (BIPV) present a viable alternative. PV Rooftop technology is currently trending, as evidenced by its increasing adoption in both industrial and residential sectors, supported by the global decline in solar panel prices. However, from an architectural perspective, silicon-based PV panels can reduce the aesthetic appeal of buildings. An emerging solution promoted by architects worldwide is the implementation of semi-transparent, dye-sensitized solar cells (DSSC), which are sensitive to colorants. In addition to their functional properties, DSSCs offer high aesthetic value due to the pigments used. Urban areas hold significant potential for the development of off-grid DSSC photovoltaic systems installed on rooftops and building facades. This study focuses on the analysis of off-grid DSSC PV systems for a type 42 residential house in Palembang City. The research employs a quantitative approach, using literature review and field measurements, followed by technical calculations. The article details the components required for designing an off-grid DSSC photovoltaic system capable of supplying all household electrical loads.
Characterization of Cassava Sludge and Tofu Wastewater as Anaerobic Digestion Substrates for Biogas Production Daya Wulandari; Riztamala Diana; Laras Niti Mulyani; Julien Alpa Harzon; Mella Aulia
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 6 No. 2 (2026): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v6i2.528

Abstract

The increasing generation of organic waste from the food processing industry has created opportunities for converting biodegradable residues into renewable energy. Cassava sludge and tofu wastewater contain biodegradable organic matter and may serve as substrates for anaerobic digestion. This study aimed to characterize the initial physicochemical properties of cassava sludge and tofu wastewater and assess their characteristics and endpoint gas profiles under different substrate formulations. Four formulations were evaluated: cassava sludge (S1), cassava sludge mixed with tofu wastewater (S2), tofu wastewater (S3), and cassava sludge supplemented with a microbial inoculum (S4). Activated Effective Microorganisms 4 (EM4) was applied to all formulations. Initial characterization included pH, temperature, total nitrogen (TN), total suspended solids (TSS), turbidity, chemical oxygen demand (COD), and biochemical oxygen demand (BOD). Reactor pH and temperature were monitored every three days for 21 days batch digestion period, followed by endpoint gas composition analysis. Cassava sludge exhibited the highest initial COD and BOD concentrations, at 19,409 and 8,640 mg/L, respectively, with TSS and TN concentrations of 680 and 270 mg/L. The cassava sludge tofu wastewater formulation showed COD and BOD concentrations of (13,355 mg/L and 6,028 mg/L), respectively, whereas tofu wastewater showed values of (6,644 mg/L and 2,974 mg/L). S4 exhibited lower initial COD and BOD concentrations of 389 and 175 mg/L, respectively, reflecting the initial characteristics of the formulation containing additional microbial inoculum. During the digestion period, temperatures ranged from (25.1–32.2 °C). while pH generally increased across the formulations. At the end of the 21 days digestion period, S4 showed the highest CH₄ reading (65.4%LEL), followed by S1 (9.7%LEL), S3 (4.7%LEL), and S2 (3.9%LEL). The observed results indicate differences in endpoint gas characteristics among the substrate formulations under the experimental conditions. Overall, the initial physicochemical characteristics and endpoint gas profiles provide a basis for assessing cassava sludge and tofu wastewater as substrates for anaerobic digestion.
IMPLEMENTASI COIN ACCEPTOR SEBAGAI SISTEM PEMBAYARAN PADA PROTOTYPE RAK PENGERING SEPATU BERBASIS MIKROKONTROLER Wansah Aditya; Yudis Setiawan; Ade Putra Maulana; Daya Wulandari
Prosiding Seminar Nasional Inovasi Teknologi Terapan Vol. 6 No. 1 (2026): Prosiding Seminar Nasional Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

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

Abstract

Conventional shoe drying methods still rely on weather conditions, making them less effective especially during the rainy season or in environments with high humidity. Additionally, the use of commercial shoe dryers requires a payment system that is practical and easy to operate. This literature review aims to analyze the implementation of a coin acceptor as a payment system in a microcontroller-based shoe dryer rack prototype. The method used is a narrative literature review, involving the collection and analysis of various scientific articles, journals, and conference proceedings published between 2021 and 2025 via Google Scholar. The analysis was conducted descriptively by examining the operating principles of coin acceptors, microcontroller based shoe dryer technology, and the potential for integrating these two systems. The results indicate that coin acceptors have a high level of accuracy in detecting coins and can be integrated with microcontrollers to automatically regulate service duration. Meanwhile, a microcontroller-based shoe-drying system that utilizes a heater, fan, and temperature-humidity sensors has proven capable of improving the effectiveness of the drying process. The integration of these two technologies has the potential to produce a self-service shoe drying system that is practical, efficient, and easy to use. Thus, a coin acceptor could serve as an alternative payment system that supports the development of microcontroller based shoe drying racks.
Co-Authors Ade Putra Maulana Cahyani, Aulia Decky Putra Revo Devina Sanchia Samosir Endah Arum Wangi Godlove Elioth Kiswaga Julien Alpa Harzon Laras Niti Mulyani Leila Utarina Marisa Tri Octavia Mella Aulia Mildazani Mitha Pratiwi Moulita, R.A. Nurul Muhammad Yerizam Pakpahan, Cindy Putri Afifa Nur Oktadina Riztamala Diana Riztamala Diana Roviu Darojat Rusdianasari Rusdianasari Titin Indriati Utarina, Leila Veniati Wansah Aditya Yudis Setiawan