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All Journal Jurnal Sains Teknologi dan Lingkungan (JSTL) CHEESA: Chemical Engineering Research Articles Jurnal Serambi Engineering Media Ilmiah Teknik Lingkungan Nusantara Science and Technology Proceedings Envirotek : Jurnal Ilmiah Teknik Lingkungan Journal Serambi Engineering (JSE)
Okik Hendriyanto Cahyonugroho
Department Of Environmental Engineering, Universitas Pembangunan Nasional “Veteran” Jawa Timur, Surabaya 60294, Indonesia
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology Public Health

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Estimasi Emisi Gas Rumah Kaca (GRK) di TPA Benowo Menggunakan Model LandGem: Estimation of Green House Gas (GHG) Emissions at Benowo Landfill Using the LandGem Model Rimadhani Prilindatami; Okik Hendriyanto Cahyonugroho
JURNAL SAINS TEKNOLOGI & LINGKUNGAN Vol. 9 No. 4 (2023): JURNAL SAINS TEKNOLOGI & LINGKUNGAN
Publisher : LPPM Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jstl.v9i4.518

Abstract

Greenhouse gases (GHG) are one of the dangerous gases that cause global warming. Greenhouse gases include methane gas and carbon dioxide. In large quantities, this gas can cause damage to the atmosphere. Greenhouse gas emissions are dominated by waste management activities at landfills. Benowo Landfill is one of the Landfills that manages the waste of the residents of Surabaya City. The more waste that is piled up in the landfill, the more gas is produced. So it is necessary to estimate the occurrence of methane gas and carbon dioxide gas in landfills. LandGem is a model that is able to estimate greenhouse gases that will appear in landfills. In this research, greenhouse gas estimates were carried out at the Benowo landfill using 3 scenarios. This scenario is applied to determine the influence of weather (k value) on the landfill. The results showed that scenario 3 which uses a k value of 0.7 (wet area) has the highest estimate of methane and carbon dioxide compared to the other scenarios, namely 6.801 x 107 m3/year. This happens because the k value means that the landfill area has high rainfall and there is a bioreactor or leachate circulation system. This value is considered a good value for bacterial growth in landfills.
Comparison of DAF Pretreatment between Static Mixer and Impeller Mixer for Oil and Grease Reduction Rizka Novembrianto; Firra Rosariawari; Okik Hendriyanto Cahyonugroho; Syadzadhiya Qothrunada Zakiyayasin Nisa'; Praditya Sigit Ardisty Sitogasa; Restu Hikmah Ayu Murti
Nusantara Science and Technology Proceedings 8th International Seminar of Research Month 2023
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2024.4107

Abstract

The problem of domestic wastewater originating from restaurants is the largest contributor to organic wastewater in urban waters. Among them are waste water parameters, namely oil, and grease. Oils and grease are compounds that do not dissolve easily in water. However, it can be dissolved with non-polar organic solvents. The carbon chains of oils and grease are also long. So, it is difficult to decompose and takes a long time if processing uses the help of microorganisms. So, the alternative is to use physical-chemical processing. In this research, we tried using a static mixer and an impeller mixer. We conducted a systematic review of DAF techniques in wastewater treatment. We reviewed six indexed databases namely dissolved air flotation, microbubbles, wastewater treatment, and key operational and design parameters involved in the effectiveness of the flotation process. In this pre-treatment, the focus is on the withdrawal/discharge speed in collecting wastewater as a test and the effectiveness of mixing wastewater with coagulants and air pressure. These three aspects are used in equilibrium to achieve the optimum dose for the static mixer use scheme. Meanwhile, the impeller mixer scheme uses rotational speed in mixing with the coagulant, contact time, and Reynolds number to achieve the required turbulence. Apart from that, the use of electrical energy in the pump is also calculated in these two schemes. The results obtained were the amount of weight of oil and grease collected in the static mixer pretreatment of 9.12% w/v and the impeller mixer of 7.63% w/v and the results of the organic content of the Chemical Oxygen Demand (COD) parameter for the static mixer were 86.92 % and mixer impeller 78.86 %. From these results, static mixers have advantages over using impeller mixers in terms of the effectiveness of the oil and grease reduction process.
Effect of Flow Rate on Hexavalent Chromium Reduction in Electroplating Wastewater Using TiO2 Immobilized Resin Arya Darmawan; Okik Hendriyanto Cahyonugroho; Ram Babu Pachwarya
CHEESA: Chemical Engineering Research Articles Vol. 8 No. 2 (2025): In Progress
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v8i2.23102.76-85

Abstract

This study aims to analyze the effect of flow rate on the reduction of hexavalent chromium (Cr6+) in electroplating wastewater treated with a TiO2-immobilized resin in a continuous fixed-bed reactor. The electroplating wastewater, characterized by Cr6+, was treated with RIPT-TiO2 functioning as a catalyst to enhance the contaminant degradation process. The flow rate was then examined to observe the effect on the reduction of Cr6+ concentration during the reaction. The results showed that increasing the flow rate within the range of 40–70 mL/min affected the reduction of Cr6+, and ultimately influenced the photocatalytic efficiency. The flow rate affected the contact time between the wastewater and the catalyst. The best removal efficiency, reaching 50.83% at 180 minutes, was obtained at a lower flow rate. This study provides important contributions to the development of sustainable and efficient electroplating wastewater treatment technology using a continuous reactor system with a TiO2-immobilized resin.
Analysis of Psychosocial Hazard Potential and Its Implications on the Occupational Safety and Health Performance of Employees in the QC Department of PT Garudafood Putra Putri Jaya, Tbk : Analisis Potensi Bahaya Psikososial dan Implikasinya terhadap Kinerja K3 Karyawan Departemen QC PT Garudafood Putra Putri Jaya, Tbk Moch Akeyla Anugrah; Okik Hendriyanto Cahyonugroho
Media Ilmiah Teknik Lingkungan (MITL) Vol. 11 No. 1 (2026): Media Ilmiah Teknik Lingkungan (MITL)
Publisher : ​Institute for Researches and Community Services Universitas Muhammadiyah Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33084/mitl.v11i1.11755

Abstract

Because it can have an impact on employee performance, work stress is an important issue for businesses. The goal of this study is to assess the degree of stress using a straightforward random sampling technique. The Slovin formula and a 10% tolerance level are used to estimate the sample size. In accordance with the appendix to the Minister of Manpower Regulation (PERMENAKER) Number 5 of 2018 concerning Occupational Safety and Health in the Work Environment, a cross-sectional study was carried out using a quantitative approach with descriptive analysis. Respondents from the Quality Control (QC) department completed the questionnaire. Both the reliability and validity tests yielded reliable results. According to the study's findings, of the 44 responders to the questionnaire, 40 (90.91%) were classified as having mild stress and 4 (9.09%) as having moderate stress. The aforementioned rationale leads to the conclusion that workers in PT Garudafood Putra Putri Jaya, Tbk's Quality Control (QC) department are not overly stressed at work.
Analysis of the Socio-Economic Impact on the Community of Village X Due to the Construction of Hotel X: Analisis Dampak Sosial Ekonomi Masyarakat Desa X Akibat Pembangunan Hotel X Muhammad Rizal Rosyadi; Okik Hendriyanto Cahyonugroho
Media Ilmiah Teknik Lingkungan (MITL) Vol. 11 No. 1 (2026): Media Ilmiah Teknik Lingkungan (MITL)
Publisher : ​Institute for Researches and Community Services Universitas Muhammadiyah Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33084/mitl.v11i1.11770

Abstract

The construction of Hotel X in a Village, has brought various social and economic changes to the surrounding community. This study aims to examine how the project influences local social conditions, levels of concern, community perceptions, employment opportunities, and household income. A descriptive approach was used by combining primary data obtained through field observations and interviews, with secondary data derived from official documents and relevant literature. The findings indicate that most residents are aware of the development plan and generally show a positive response. The community perceives that the presence of the hotel may create new job opportunities and increase income, although a small number of residents still express concerns regarding the changes occurring during the pre-construction and construction phases. These perceptions are shaped by the information received and the direct experiences of the community throughout the development process. Overall, the construction of Hotel X tends to provide economic benefits for the local population; however, proper management of social aspects remains necessary to ensure that the changes are widely accepted and do not generate tension within the community.
Co-Authors Aditya Rizky Dwicahya Aditya Titian Dickdoyo Aisyah Nadia Andhyanerra Irsia Prasasti Arya Darmawan Eginta Marovid Tarigan Euis Nurul Hidayah Fadhilah Labibah Nurjanah Fairuz Khurotul Aini Firra Rosariawari Imaniar Ramadhani Indah Nur Fauziyyah Lolita Kurniasari Moch Akeyla Anugrah Mochammad Shaifullah Indrawanto Muhammad Rizal Rosyadi Nisa', Syadzadhiya Qothrunada Zakiyayasin Novembrianto, Rizka Novira Putri Amini Praditya Sigit Ardisty Sitogasa Raka Rulistyanto Prakoso Putra Ram Babu Pachwarya Restu Hikmah Ayu Murti Rimadhani Prilindatami Savira Fevilia Savira Safrilia Shinta Ajeng Salyndri Hifdzul Aqlys Siti Kayyisa Nakhwa Endjani Valentino Rizkiar Pradana Zakkiyah Salwa Meydhita Nur Sabrina