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All Journal Waste Technology Jurnal Inotera Jurnal Serambi Engineering
Isma Wulansari
Politeknik STMI Jakarta
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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The Oxidation of Sulphide Compounds in the Order of Processing Sodium Hydrosulphides Isma Wulansari; Wahyudi Budi Sediawan; M. Hidayat
Waste Technology Vol 11, No 1 (2023)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/11.1.42-51

Abstract

Oxidation of spent sulfidic caustic consist of SH- ion or NaHS compound by H2O2 in neutral or acidic solution to elemental sulphur may provide a convenient and economical method for the control of sulphide wastes and their associated odors at pulp, paper and textile industry. The effects of total sulphide concentration, isothermal and nonisothermal process, catalyst loading, ratio of SH-/H2O2 and temperature on the kinetics of sulphide oxidation were investigated. Kinetic equations and activation energies of H2O2 and SH- ion to total sulphur and sulphate in aqueous solution for the non catalytic and catalytic oxidation reaction were calculated based on the experimental results. The rate of SSC oxidation was found higher at lower initial sulphide concentration and the rate of sulphide oxidation was found directly proportional to loading and hydrogen peroxide addition. Optimum total sulphide concentration was achieved when sulphide solutions were treated at pH 4 in the presence of H2O2 in the ratios SH-/H2O2 1:5.6. The potential user of H2O2 determine the optimal conditions for control of odor, corrosion and waste treatment cost due to SSC consisting of sulphur ion, sulphate ion, etc. The oxidation of sulphides into sulphates by H2O2 may be applied directly to aqueous wastes containing these odorants.
Peningkatan Value Added dalam Industri Tahu melalui Penerapan Lean Manufacturing dan Analisis Waste Fredy Sumasto; Muhammad Raihan Akbar; Shafiratul Fajri Harisul Husna; Indra Rizki Pratama; Isma Wulansari; Muhamad Fahrul Rozi; Ahlan Ismono
Jurnal Serambi Engineering Vol 8, No 4 (2023): Oktober 2023
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/jse.v8i4.6876

Abstract

Productivity is the most vital part of the food industry as it is one of the priority industries in Indonesia. PD. Saluyo is an industry that produces tofu, which needs to increase production efficiency to meet market needs. The problem in the tofu production process is the high waiting time during soybean soaking. The approach used in this research is lean manufacturing by mapping the process using Value Stream Mapping so that Value Added, Non-Value Added and Necessary Non-Value Added activities can be mapped. Further, Value Added, Non-Value Added and Necessary Non-Value Added data processing is weighted in VALSAT to determine the most significant waste and mapped through PAM. The mapping results obtained a VA of 3,29%, NVA of 90,64% and Necessary Non-Value Added of 6,06%. Based on the results of the VALSAT calculation, the most significant waste is found in time waiting and unnecessary motion. These results are re-mapped in PAM for further analysis using the Cause-Effect Diagram. The analysis results of PAM and the Cause-and-Effect Diagram proposed improvements to change the soaking process method using hot water and create a new SOP to adjust to the proposed production process. The results of the proposed improvements can increase the value added by 0,07% from 3,29% to 3,36%.
Comparison of Ergonomic Assessment Results in the Automotive Polymer Industry: Cornell Musculoskeletal Discomfort Questionnaire (CMDQ) and Rapid Upper Limb Assessment (RULA) Methods Khadijah Sayyidatun Nisa; Abdussalam Topandi; Isma Wulansari; Fauziah Aulia; Bismo Zulfikar Mustofa
Jurnal Inotera Vol. 9 No. 1 (2024): January-June 2024
Publisher : LPPM Politeknik Aceh Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31572/inotera.Vol9.Iss1.2024.ID309

Abstract

Musculoskeletal disorders (MSDs) encompass injuries to muscles, nerves, joints, and connective tissues, affecting the neck, back, and limbs. The polymer automotive industry, particularly in manufacturing automotive components using plastic injection tools, involves workers with diverse postures. Non-ergonomic postures can lead to muscle tension and health issues, emphasizing the importance of safety and ergonomics. This study employs the Cornell Musculoskeletal Discomfort Questionnaire (CMDQ) and Rapid Upper Limb Assessment (RULA) methods to assess working postures. In the production sector, the average RULA score is 3.8 (31.67%), indicating moderate risk and suggesting further investigation. Conversely, the non-production sector's average RULA score is 3.4 (28.33%), indicating a lower risk but still necessitating changes. CMDQ analysis on 12 respondents reveals posture variation. In the production sector, the average CMDQ score is 2.5 (20.83%), signaling moderate risk and advocating for further investigation. This study lays groundwork for downstream polymer industries to enhance efficiency, quality, and safety.
Co-Authors Abdussalam Topandi Ahlan Ismono Bismo Zulfikar Mustofa Fauziah Aulia Indra Rizki Pratama Khadijah Sayyidatun Nisa M. Hidayat Muhamad Fahrul Rozi Muhammad Raihan Akbar Shafiratul Fajri Harisul Husna Sumasto, Fredy Wahyudi Budi Sediawan