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

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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)
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.
EVALUASI PERAN RUANG TERBUKA HIJAU DALAM MITIGASI EMISI KARBON DIOKSIDA TRANSPORTASI DI SIDOARJO Nursinta Abadiyah; Okik Hendriyanto Cahyonugroho
Racic : Rab Construction Research Vol. 11 No. 1 (2026): JUNI
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v11i1.6892

Abstract

Urban Green Infrastructure serves a critical function in spatial planning and emission mitigation in cities. This study aims to evaluate UGI located in the city center and the suburban area of Sidoarjo. The research was conducted using traffic counting along the roads adjacent to both parks and tree inventory, including species identification, diameter at breast height (DBH), crown width, tree height, and tree condition. Data analysis employed the IPCC Tier 2 approach, i-Tree Eco, and NDVI processed with ArcGIS. The results indicate that carbon dioxide emissions from motor vehicles were higher at Apkasi Park, located in the suburban area, compared to Abhirama Park, located in the city center. Conversely, CO₂ sequestration capacity showed the opposite trend: Apkasi Park contained 70 trees with a sequestration capacity of 0.39 kg/hour, while Abhirama Park had 159 trees with a sequestration capacity of 0.90 kg/hour. This demonstrates a relatively small percentage of sequestration compared to the emissions produced. NDVI analysis further revealed that Apkasi Park still has sufficient space for additional tree planting, whereas Abhirama Park has already reached a relatively high vegetation density.
Komunitas Fitoplankton sebagai Bioindikator Kualitas Air Sungai Kali Surabaya Desi Salsabila Putri; Okik Hendriyanto Cahyonugroho
Spizaetus: Jurnal Biologi dan Pendidikan Biologi Vol 6 No 3 (2025): Spizaetus: Jurnal Biologi dan Pendidikan Biologi
Publisher : Program Studi Pendidikan Biologi, FKIP, Universitas Nusa Nipa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55241/spibio.v6i3.658

Abstract

The Kali Surabaya River is one of Indonesia's rivers impacted by pollution from industrial and domestic activities. Conventional water pollution analysis generally relies on physicochemical parameters and often overlooks biological factors. This study aims to analyze phytoplankton biological indices as bioindicators of water quality and integrate them with the results of the Pollution Index (PI). Water samples were collected using purposive sampling from four stations for the analysis of physicochemical parameters and phytoplankton identification using a 40 µm plankton net. The obtained data were analyzed by calculating the phytoplankton diversity index and the Pollution Index (PI). During the two-week research period, the phytoplankton community structure was dominated by Scenedesmus sp. (22.92%), Nitzschia sp. (12.76%), and Merismopedia sp. (10.75%), indicating organic pollution and eutrophication in the Kali Surabaya River. The PI results classified the river as slightly polluted (1.8 – 4.935). This study concludes that the integration of phytoplankton bioindicators with the pollution index analysis is effective in indicating pollution status and condition.
Pengaruh Jenis Oksidator terhadap Karakteristik Bahan Organik Alami pada Pengolahan Air Sungai Siti Nur Hidayah; Okik Hendriyanto Cahyonugroho; Nur Laili Alfiatin Mukharromah
Jurnal Serambi Engineering Vol. 11 No. 3 (2026): Juli 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Bahan organik alami merupakan komponen organik yang umum terdapat pada perairan dan dapat menurunkan kualitas air serta berpotensi membentuk produk samping desinfeksi yang berbahaya. Penelitian ini bertujuan untuk mengevaluasi pengaruh penggunaan kalium permanganat (KMnO4) dan kalsium hipoklorit Ca(OCl)2 sebagai oksidator pada proses preoksidasi yang dikombinasikan dengan koagulasi-flokulasi, sedimentasi, dan adsorpsi untuk menyisihkan bahan organik alami dari air sungai. Variasi waktu kontak preoksidasi yang digunakan yaitu 15, 30, 60, dan 120 menit, waktu sedimentasi divariasikan selama 30, 60, 120, dan 240 menit, dan waktu kontak adsorpsi selama 15, 45, 60, dan 90 menit. Proses koagulasi menggunakan aluminium sulfat 45 mg/L dan adsorpsi menggunakan karbon aktif 20 mg/L. Kinerja pengolahan dievaluasi berdasarkan parameter Chemical Oxygen Demand (COD) dan absorbansi UV254. Hasil penelitian menunjukkan bahwa kombinasi proses preoksidasi, koagulasi-flokulasi, sedimentasi, dan adsorpsi mampu menurunkan nilai COD dari 160 mg/L menjadi 40 mg/L pada penggunaan KMnO4 dan Ca(OCl)2. Nilai UV254 juga mengalami penurunan dari 0,12633 cm-1 menjadi 0,07074 cm-1 pada penggunaan KMnO4 dan dari 0,12633 cm-1 menjadi 0,08563 cm-1 pada penggunaan Ca(OCl)2. Penambahan preoksidasi menggunakan KMnO4 dan Ca(OCl)2 sebelum KFS dan adsorpsi meningkatkan penurunan konsentrasi bahan organik.
Karakteristik Bahan Organik Alami pada Air Sungai Akibat Pengaruh Mikroalga Nitzschia sp. Dheas Rizqi Ameilia; Okik Hendriyanto Cahyonugroho; Hendrata Wibisana; Nur Laili Alfiatin Mukharomah
Jurnal Serambi Engineering Vol. 11 No. 3 (2026): Juli 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Bahan organik alami merupakan kumpulan senyawa organik alami yang banyak ditemukan di perairan dan berasal dari proses dekomposisi bahan organik maupun aktivitas organisme akuatik, termasuk mikroalga. Keberadaan mikroalga di perairan dapat memengaruhi karakteristik bahan organik alami melalui proses pertumbuhan, metabolisme, dan lisis sel yang menghasilkan berbagai senyawa organik. Penelitian ini bertujuan untuk mengetahui bagaimana keberadaan mikroalga Nitzschia sp. dapat memengaruhi bahan organik alami di air sungai. Penelitian ini dilakukan secara batch dengan reaktor kapasitas 1,5 L yang berisi air Sungai Tambak Oso dan kultur Nitzshia sp. yang diaerasi selama penelitian, kemudian dilakukan sampling pada waktu 0, 3, 6, dan 9 hari pengamatan. Hasil penelitian menunjukkan bahwa penambahan Nitzschia sp. memengaruhi karakteristik bahan organik alami, ditunjukkan oleh perubahan nilai COD. Pada fase pertumbuhan Nitzschia sp., nilai COD cenderung menurun akibat pemanfaatan senyawa organik untuk pembentukan biomassa, sedangkan pada fase kematian terjadi peningkatan akibat pelepasan senyawa organik hasil lisis sel ke dalam perairan. Perlakuan dengan rasio Nitzschia sp. 1:1 menghasilkan kandungan bahan organik lebih tinggi yaitu 1500 mg/L dibandingkan rasio 3:1 yang hanya 1333.3 mg/L. Hal ini menunjukkan bahwa semakin besar rasio mikroalga Nitzschia sp. yang ditambahkan maka semakin besar kontribusinya terhadap peningkatan kandungan bahan organik alami di dalam air sungai.
Kinerja Pertumbuhan Tetraselmis chuii dan Hubungannya dengan Penyisihan COD, TSS, dan Kromium pada Berbagai Konsentrasi Limbah Cair Penyamakan Kulit Ashfiyak Nur Hamid; Okik Hendriyanto Cahyonugroho
Jurnal Serambi Engineering Vol. 11 No. 3 (2026): Juli 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Limbah cair penyamakan kulit mengandung beban pencemar organik dan logam berat yang tinggi sehingga berpotensi mencemari lingkungan. Penelitian ini bertujuan menganalisis keterkaitan kelimpahan sel Tetraselmis chuii dengan efisiensi penyisihan Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), dan total kromium (Cr total) pada berbagai konsentrasi limbah cair penyamakan kulit. Penelitian menggunakan rancangan eksperimental dengan empat variasi konsentrasi limbah, yaitu 20%, 50%, 75%, dan 100% selama 21 hari kultivasi. Parameter yang diamati meliputi kelimpahan sel mikroalga, konsentrasi COD, TSS, dan Cr total, Hasil penelitian menunjukkan bahwa Tetraselmis chuii mampu tumbuh pada seluruh variasi konsentrasi limbah, namun pertumbuhan terbaik diperoleh pada konsentrasi limbah 20% dengan kelimpahan sel mencapai 20 × 10⁶ sel/mL pada hari ke-14. Penyisihan COD tertinggi terjadi pada konsentrasi limbah 20%, yaitu dari 1350,2 mg/L menjadi 98,8 mg/L (92,68%), penyisihan TSS tertinggi terjadi pada konsentrasi limbah 50%, yaitu dari 180 mg/L menjadi 26,67 mg/L (85,18%), sedangkan penyisihan Cr total tertinggi terjadi pada konsentrasi limbah 20%, yaitu dari 15 mg/L menjadi 0,4 mg/L (97,33%). Analisis korelasi menunjukkan bahwa peningkatan kelimpahan sel berkaitan dengan penurunan konsentrasi pencemar.
Co-Authors Aditya Rizky Dwicahya Aditya Titian Dickdoyo Aisyah Nadia Andhyanerra Irsia Prasasti Arya Darmawan Ashfiyak Nur Hamid Desi Salsabila Putri Dheas Rizqi Ameilia Eginta Marovid Tarigan Euis Nurul Hidayah Fadhilah Labibah Nurjanah Fairuz Khurotul Aini Firra Rosariawari Hendrata Wibisana Imaniar Ramadhani Indah Nur Fauziyyah Iqbal Attaqi Adriansyah Lolita Kurniasari Moch Akeyla Anugrah Mochammad Shaifullah Indrawanto Muhammad Rizal Rosyadi Nisa', Syadzadhiya Qothrunada Zakiyayasin Novembrianto, Rizka Novira Putri Amini Nur Laili Alfiatin Mukharomah Nur Laili Alfiatin Mukharromah Nursinta Abadiyah 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 Siti Nur Hidayah Valentino Rizkiar Pradana Zakkiyah Salwa Meydhita Nur Sabrina