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All Journal Indonesian Journal of Multidisciplinary on Social and Technology Journal Of Chemical Process Engineering
Dyah Setyo Pertiwi
Institut Teknologi Nasional Bandung
Aerospace Engineering Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Economics, Econometrics & Finance Energy Engineering Social Sciences

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Identification and Control of Occupational Hazards in Recycled Paper Production Using the HIRADC Method Dyah Setyo Pertiwi; Trinita Septiani Putri; Khairunnisa Fitri Maryam; Riny Yolandha Parapat
Indonesian Journal of Multidisciplinary on Social and Technology Vol. 4 No. 2 (2026): Maret - Juni
Publisher : PT Ilmu Data Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69693/ijmst.v4i2.10047

Abstract

The recycled paper manufacturing industry involves various production stages that may expose workers to occupational hazards. This study aims to identify potential hazards, assess risk levels, and determine appropriate control measures in the production of recycled paper (Samson kraft) using the Hazard Identification, Risk Assessment, and Determining Control (HIRADC) method. Data were collected through direct observation, interviews with production workers and laboratory personnel, and documentation of production activities. Hazard identification was conducted in all production stages, including raw material storage and pressing, hydropulping, stock preparation, paper machine operations (wire part, press part, and dryer part), calendering, pope reel operations, and wastewater treatment. The results identified 24 potential hazards categorized as physical, mechanical, chemical, ergonomic, environmental, electrical, and biological hazards. Risk assessment indicated that Very High risks were concentrated in hydropulping, press part, dryer part, and calendering operations due to rotating machinery entrapment and exposure to high-temperature steam. High risks were associated with slippery floors, noise exposure, chemical handling, and material handling activities, while medium risks were mainly related to ergonomic strain and low-level chemical exposure. Evaluation of existing controls showed that risk mitigation measures were primarily based on administrative controls and personal protective equipment (PPE), whereas engineering controls remained limited in several critical areas. Residual risk assessment demonstrated that risk levels decreased after implementing proposed controls; however, several hazards remained at medium risk levels. Therefore, strengthening engineering controls, safety training, and safety culture is necessary to improve occupational safety performance in recycled paper manufacturing facilities.
Performance Comparison of Static and Rotating Bioreactor for Bacterial Cellulose Production from Tofu Wastewater Choerudin; Dadi Arif Viliando; Dyah Setyo Pertiwi
Journal of Chemical Process Engineering Vol. 11 No. 1 (2026): Journal of Chemical Process Engineering
Publisher : Fakultas Teknologi Industri - Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33096/jcpe.v11i1.2362

Abstract

Tofu industry wastewater is a potential substrate for bacterial cellulose (BC) production due to its residual nutrient content. However, conventional static culture has limited oxygen transfer and substrate diffusion, resulting in low substrate utilization efficiency. This study presents a comparative evaluation of static and rotating bioreactor (RB) systems, with a primary focus on substrate utilization, bacterial growth, and BC yield. In addition, the effect of inoculum volume (10% and 30%) was investigated to assess its influence on process performance. The results demonstrate that the RB system significantly outperforms static culture, achieving 1.6 – 2 times higher substrate utilization and 53.3 - 61.3% higher BC yield on initial substrate. The highest BC product is 5 g dry mass BC/ L medium in the RB system.   Furthermore, the RB system enhances substrate conversion toward bacterial growth, indicating improved metabolic efficiency under dynamic conditions. A lower inoculum volume, 10% inoculum with 1-10 million CFU/mL, resulted in better overall performance compared to 30% inoculum, suggesting that excessive inoculum does not improve process efficiency. These findings confirm that the rotating bioreactor is a more effective system for intensifying BC production, particularly in terms of substrate utilization, and highlight its potential for scalable and sustainable bioprocess applications.
Co-Authors Choerudin Dadi Arif Viliando Khairunnisa Fitri Maryam Riny Yolandha Parapat Trinita Septiani Putri