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All Journal Jurnal Ilmu Lingkungan Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Journal of Engineering Science and Technology Management Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Venus: Jurnal Publikasi Rumpun Ilmu Teknik BioHealth Jurnal Kendali Teknik dan Sains
Revi Lasmita
Institut Kesehatan Dan Teknologi Al Insyirah
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering

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Journal : journal of engineering science and technology management

 1 
Analysis of Environmental Traffic Flow Characteristics on Jalan Kaharuddin Nasution – Marpoyan, Pekanbaru City Lasmita, Revi; Putri Permata MS, Ayu; Gusnanda
Journal of Engineering Science and Technology Management (JES-TM) Vol. 3 No. 2 (2023): September 2023
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v3i2.129

Abstract

Jalan Kaharuddin Nasution, a major educational area in Pekanbaru, hosts numerous schools and universities along with various amenities such as hotels, restaurants, cafes, shops, and street vendors. This study focuses on three key traffic components: Speed, Volume, and Density, aiming to analyze service levels on Kaharuddin Nasution Street. The research investigates the relationship between traffic flow components (Volume, Speed, and Density) using the Greenshield and Greenberg Models. Findings reveal that the Greenshield Model best portrays congestion density (Dj), ranging from 103.17 to 126.41 vehicles/km, compared to Greenberg's much higher Dj values (642.89 – 3990.35 vehicles/km). Greenshield also identifies maximum volume/capacity (1801.74 – 2562.53 vehicles/hour), while Greenberg shows higher capacity (3477.38 – 12826.50 vehicles/hour), inconsistent with the road's actual capacity. Service levels on Kaharuddin Nasution Street throughout the week are categorized as E, indicating service levels beyond speed measurement due to consistently lower speeds than level D. Unstable traffic results from near-capacity volumes, causing congestion and occasional standstill. Effective traffic management considering volume, speed, and density is essential to anticipate future congestion issues on Kaharuddin Nasution Street.
Occupational Health and Safety Risk Analysis Using The HAZOP Method at UD Kerupuk Mamak Kito Ardeline, Mela; Lasmita, Revi
Journal of Engineering Science and Technology Management (JES-TM) Vol. 5 No. 2 (2025): September 2025
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v5i2.331

Abstract

Occupational Health and Safety (OHS) is an approach designed to prevent workplace accidents that may cause death, injury, or disability. If potential hazards in the workplace are not adequately identified and managed, they can lead to fatigue, musculoskeletal disorders, injuries, or serious accidents. Due to the high-risk nature of its production processes and the lack of ergonomic considerations, the kerupuk processing industry at UD Mamak Kito must pay greater attention to Health, Safety, and Environment (HSE). One method to support OHS implementation is the HAZOP (Hazard and Operability Study) method, which systematically identifies potential hazards in the workplace. The study identified ten high-risk conditions, primarily associated with the use of personal protective equipment (PPE), ergonomics, and exposure to high heat or hot oil. Six moderate-risk conditions were also found, including failure to use PPE and minor environmental hazards. Low-risk factors, including minor cuts and slippery surfaces, were additionally observed. Based on these findings, recommended improvements include enhancing workplace conditions and promoting safer work practices to reduce the risk of accidents and occupational health problems.
Size and Shape Distribution of Microplastics in PET Recycled Wastewater and Their Removal Behavior during the Coagulation–Flocculation Process Fadlilah, Lilya Irsianti; Ardeline, Mela; Lasmita, Revi
Journal of Engineering Science and Technology Management (JES-TM) Vol. 5 No. 2 (2025): September 2025
Publisher : Journal of Engineering Science and Technology Management

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

Abstract

Plastic Recycling Facilities (PRFs), although intended to reduce plastic pollution, can act as potential sources of microplastic release due to mechanical processing activities. This study aims to investigate the size and shape distribution of microplastics in polyethylene terephthalate (PET) recycling wastewater and to evaluate their removal behavior through coagulation–flocculation processes. Wastewater samples were collected from several treatment stages of the wastewater treatment system at a PET recycling facility. The results indicate that microplastics are predominantly fragment-shaped, with medium-sized particles representing the most abundant fraction. Coagulation–flocculation was shown to effectively remove microplastics, particularly fragment-shaped and medium-sized particles, compared to film and fiber forms. Removal efficiency was influenced by microplastic size and shape characteristics. These findings suggest that coagulation–flocculation has strong potential as an effective method for controlling microplastic release from PET recycling wastewater and provides a basis for developing more targeted wastewater treatment strategies.
Co-Authors Aras Mulyadi Ardeline, Mela Fadlilah, Lilya Irsianti Fauzi, Manyuk Gusnanda Jecky Asmura Putri Permata MS, Ayu Syarfi Daud Winda Yuliana Sari