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All Journal IJEMS (Indonesian Journal of Environmental Management and Sustainability) Industrika : Jurnal Ilmiah Teknik Industri
Ramadhan, Muhammad Ragil
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Agriculture, Biological Sciences & Forestry Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Energy Engineering Environmental Science Industrial & Manufacturing Engineering Public Health

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The Effectiveness of Polysilicone Coated Chitosan-Nanosilver as a Disinfectant in Drinking Water Treatment Processes Nisah, Firda Ainun; Winarsih, Neneng; Nuraini, Umi; Mubarok, Yoga Ulya; Ramadhan, Muhammad Ragil; Febrian, Faris Diaztu
Indonesian Journal of Environmental Management and Sustainability Vol. 9 No. 1 (2025): March
Publisher : Magister Program of Material Science, Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijems.2025.9.1.12-19

Abstract

 The need for clean and safe drinking water is increasing, so innovative disinfection methods are needed. This study evaluates the effectiveness of Polysilicone coated with Chitosan-Nanosilver (PCAg) as a disinfectant for drinking water treatment. The synthesis process involves the reduction of silver nitrate (AgNO3) with sodium citrate, which is then combined with chitosan in an acetic acid solution to produce a stable mixture of nanoparticles. This solution was then impregnated into polysilicone foam to create a functional filter media. The experimental results showed that the PCAg were able to effectively remove bacterial contaminants, including Escherichia coli and Total Coliform, from the distilled drinking water samples from 4 CFU/100mL to 0 CFU/100 mL, as per the quality standard of the Ministry of Health of the Republic of Indonesia number 2 of 2023. Analysis of the SEM-EDX characterization method showed an evenly distributed Chitosan-Nanosilver coating on the polysilicone surface, evidenced by the detection of 1.31% Nanosilver and an increase in carbon percentage from 40.16% to 44.98%. In addition, analysis of the FTIR characterization method showed the presence of peaks indicating alkane vibrations, aromatic rings, ester groups, and amine groups typical of chitosan. This indicates that chitosan has been coated on polysilicone. This study concludes that the coating process enables optimal interaction between chitosan, silver nanoparticles, and polysilicone, thus enhancing the antibacterial properties of the material. Thus having a significant ability to eliminate bacteria.
Analysis of the Work Posture of Paint Warehouse Operators Using the Ovako Work Posture Analysis System (OWAS) Method in the Automotive Painting Service Industry Ramadhan, Muhammad Ragil; Suseno, Agustian; Wahyudin, Wahyudin
Industrika : Jurnal Ilmiah Teknik Industri Vol. 10 No. 2 (2026): Industrika: Jurnal Ilmiah Teknik Industri
Publisher : Fakultas Teknik Universitas Tulang Bawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37090/pf54fe40

Abstract

The rapid growth of the industrial sector in Indonesia highlights the importance of occupational health and safety, particularly in industries involving heavy physical activities such as painting services. This study aims to evaluate the working postures of paint warehouse operators at PT XYZ using the Ovako Work Posture Analysis System (OWAS) method to assess ergonomic risks in manual handling activities. The research employed a quantitative approach with a descriptive observational design through direct observation of lifting, moving, and arranging paint cans. The results indicate that most working postures pose a high risk of musculoskeletal disorders, especially during lifting and moving activities, which were classified as high-risk categories according to OWAS. The study also found that simple improvements, such as adjusting work tables and improving lifting techniques, can effectively reduce injury risks. Overall, this research provides recommendations for posture improvement to enhance worker well-being and company productivity, while serving as a basis for designing a safer and healthier work environment. Keywords: Ergonomics, Manual Handling Activities, MSDs, OWAS, Work posture
Co-Authors Agustian Suseno Febrian, Faris Diaztu Mubarok, Yoga Ulya Neneng Winarsih Nisah, Firda Ainun Umi Nuraini, Umi Wahyudin Wahyudin