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All Journal Reaktor International Journal of Science and Engineering (IJSE) TEKNIK METANA Jurnal Ilmu Lingkungan Teknotan: Jurnal Industri Teknologi Pertanian Jurnal Teknik Kimia USU JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Seminar Nasional Teknik Kimia Kejuangan Journal of Engineering and Technological Sciences Jurnal Riset Industri agriTECH Jurnal Kelautan Tropis Communications in Science and Technology Jurnal Abdi Masyarakat Indonesia Jurnal Teknik Kimia USU International Journal of Renewable Energy Development
I Nyoman Widiasa
Chemical Engineering Dept., Faculty Of Engineering, Universitas Diponegoro Jl. Prof. Soedarto SH Tembalang Semarang Telp./Fax. (024)7460058 / (024)76480675
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Public Health Other

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Fouling dan Cleaning Membran Reverse Osmosis Tekanan Rendah untuk Aplikasi Daur Ulang Air Limbah Domestik Retno Dwi Jayanti; I Nyoman Widiasa
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2016: Prosiding SNTKK 2016
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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

Abstract

Separation process by reverse osmosis membrane for wastewater reuse is an advantage process because of feasible cost and able to produce high quality of product water. The used of RO membrane on wastewater reuse application is often limited by fouling phenomena, that is the accumulation of some types of foulant on the membrane surface. An understanding of the foulant types and the fouling mechanism is the key to success in RO membrane chemical cleaning. This review discusses numerous works about the fouling mechanisms and cleaning procedures.
Program Air Kita: Program Pemberdayaan Karang Taruna Dalam Upaya Peningkatan Kualitas Air di Kelurahan Bandarharjo Bernadeta Eka Naftalina; Ayu Putri Lestari; Michael MGP Simatupang; Savero Pakavi Zahrudin; Hendrik Wijaya; I Nyoman Widiasa
Jurnal Abdi Masyarakat Indonesia Vol 1 No 1 (2021): JAMSI - September 2021
Publisher : CV Firmos

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1172.721 KB) | DOI: 10.54082/jamsi.23

Abstract

Bandarharjo merupakan sebuah kelurahan yang terletak di Kecamatan Semarang Utara, wilayah ini berbatasan langsung dengan Laut Jawa di sebelah Utara dan berkembang menjadi suatu Kawasan kumuh karena adanya banjir yang menggenang menyebabkan penurunan kualitas hidup masyarakat. Situasi ini menyebabkan air permukaan tidak dapat dimanfaatkan karena rasanya asin dan tercemar limbah. Masyarakay biasanya menggunakan air tanah untuk kebutuhan sehari-hari yang kualitasnya masuk dalam kelas E dengan kategori sangat amat buruk sehingga apabila dikonsumsi dapat menyebabkan penyakit diare. Saat ini, belum terdapat tatanan tim kelembagaan untuk mengatasi permasalahan air bersih. Oleh karena itu,  kami mengusung program dengan mengoptimalkan fungsi Karang Taruna setempat yaitu Program “Air Kita”. Program Air kita adalah program yang bertujuan meningkatkan kualitas air dan pengetahuan masyarakat tentang air bersih. Pelaksanaan program “Air Kita” menggunakan konsep blended, yaitu virtual digital, daring, dan luring dengan penerapan protokol kesehatan secara ketat. Program ini terdiri dari 2 kegiatan utama yakni pelatihan pembuatan alat pemurni air dan penyuluhan. Dari hasil uji pemeriksaan air  secara kimia dan fisika, air hasil filtrasi alat pemurni Air Kita telah memenuhi parameter yang ditetapkan oleh  Permenkes RI No.416/Menkes/Per/IX/1990 sehingga aman untuk digunakan dalam memenuhi kebutuhan sehari-hari.
Performance of An Aerated Wastewater Stabilization Pond for the Treatment of Cultivation Wastewater of Pacific White Shrimp (Litopenaeus vannamei) Grow-out Ponds Jannah, Rizkiyah Fatikhatul; Ratnawati, Ratnawati; Sunaryo, Sunaryo; Widiasa, I Nyoman
Reaktor Volume 23 No.3 December 2023
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.23.3.105-115

Abstract

Pacific white shrimp (Litopenaeus vannamei) is a major cultivated crustacean species whose aquaculture production has doubled in the last decade. The implementation of shrimp pond systems using closed or intensive methods is widely carried out. However, wastewater produced by intensive shrimp farming may cause environmental effects. This study is aimed to evaluate the feasibility of the aerated wastewater stabilization pond to treat the cultivation wastewater. The physicochemical parameters monitored were temperature, pH, salinity, ammonia, nitrite, nitrate and phosphate. In the case of this study, almost all physicochemical parameters of the water coming out of the aerated wastewater stabilization pond are suitable for use as input water for integrated multitrophic aquaculture (IMTA). Temperature, pH, salinity, nitrite, nitrate, and phosphate were 27.1°C to 32.2°C, 7.86 to 8.79, 30 ppt to 34 ppt, 0.003 mg/L to 0.068 mg/L, and 0.19 mg/L to 1.31 mg/L, respectively. Only ammonia concentration significantly fluctuated in the range of 0.44 mg/L to 12 mg/L. 
Evaluasi Kinerja Instalasi Pengolahan Air Limbah (IPAL) di PT. Rohul Sawit Industri Yasmin Nabilah; Putri, Tanti Nabella; Widiasa, I Nyoman; Tito, Adryan; Adyaksa, M. Nur
Jurnal Teknik Kimia USU Vol. 11 No. 2 (2022): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v11i2.8969

Abstract

This paper reports the performance evaluation results of the wastewater treatment plant and the quality of the effluent from the palm oil mill of PT. Rohul Sawit Industri in 2021, which uses Ponding System methods. PT. Rohul Sawit Industri are allowed to reuse the results of their waste treatment into the Land Application System. The faculative waste is monitored once a month where the data is in accordance with the UKL–UPL matrix. In the liquid waste test, samples of liquid waste are taken from the last outlet which will be flowed to the study area, referring to the applicable water sampling method. The results of laboratory tests showed that for 6 months the pH was relatively constant between ​​7–8 and the Biological Oxygen Demand (BOD)  was always below 5,000 mg/L. Both of these parameters have met the quality standards that have been set in the Decree of the State Minister of the Environment No. 29th in 2003. The level of Chemical Oxygen Demand (COD) in wastewater is between 1912.2 mg/L–9389.67 mg/L, oil and fat content in wastewater is between 6.1 mg/L–15.3 mg/L, Total Suspended Solid (TSS) liquid waste is between 700 mg/L–55,920 mg/L, ammonia levels in palm oil waste are around 62.5 mg/L–215.5 mg/L, Pb levels in waste are between 0 .08 mg/L–0.155 mg/L, Cu levels in waste are always less than 0.005 mg/L, Cd levels in sewage are always less than 0.01 mg/L, and Zn levels in waste are between 0.012 mg/L–0.098 mg/L. Based on this, the processing of liquid waste from the palm oil mill of PT. Rohul Sawit Industri is quite good because the quality of the liquid waste is still below the quality standard.
Evaluasi Kinerja Instalasi Pengolahan Air Limbah (IPAL) di PT. Rohul Sawit Industri Yasmin Nabilah; Putri, Tanti Nabella; Widiasa, I Nyoman; Tito, Adryan; Adyaksa, M. Nur
Jurnal Teknik Kimia USU Vol. 11 No. 2 (2022): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v11i2.8969

Abstract

This paper reports the performance evaluation results of the wastewater treatment plant and the quality of the effluent from the palm oil mill of PT. Rohul Sawit Industri in 2021, which uses Ponding System methods. PT. Rohul Sawit Industri are allowed to reuse the results of their waste treatment into the Land Application System. The faculative waste is monitored once a month where the data is in accordance with the UKL–UPL matrix. In the liquid waste test, samples of liquid waste are taken from the last outlet which will be flowed to the study area, referring to the applicable water sampling method. The results of laboratory tests showed that for 6 months the pH was relatively constant between ​​7–8 and the Biological Oxygen Demand (BOD)  was always below 5,000 mg/L. Both of these parameters have met the quality standards that have been set in the Decree of the State Minister of the Environment No. 29th in 2003. The level of Chemical Oxygen Demand (COD) in wastewater is between 1912.2 mg/L–9389.67 mg/L, oil and fat content in wastewater is between 6.1 mg/L–15.3 mg/L, Total Suspended Solid (TSS) liquid waste is between 700 mg/L–55,920 mg/L, ammonia levels in palm oil waste are around 62.5 mg/L–215.5 mg/L, Pb levels in waste are between 0 .08 mg/L–0.155 mg/L, Cu levels in waste are always less than 0.005 mg/L, Cd levels in sewage are always less than 0.01 mg/L, and Zn levels in waste are between 0.012 mg/L–0.098 mg/L. Based on this, the processing of liquid waste from the palm oil mill of PT. Rohul Sawit Industri is quite good because the quality of the liquid waste is still below the quality standard.
Application of Vertical Flow Constructed Wetland for Organic Pollutant Removal from Petroleum Refinery Wastewater Lestari, Amelia Eka; Widiasa, I Nyoman
Reaktor Volume 24 No.2 August 2024
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.24.2.68-75

Abstract

This study examined the application of a pilot-scale Vertical Flow Constructed Wetland (VFCW) system for secondary oil refinery effluent treatment at PPSDM MIGAS, Indonesia. The VFCW technique, known for its simplicity, minimal operational cost, and environmental friendliness, was used to reduce organic pollutants (BOD and COD) to meet the standards and minimize pollutant levels. The system, constructed with a closed pond including gravel and sand substrates, and planted with Typha angustifolia, was evaluated under Hydraulic Retention Times (HRT) of 3, 4, and 5 days. The results showed BOD removal efficiencies of 52.9%, 54.4%, and 53.6%, and COD removal efficiencies of 35.7%, 49.1%, and 47.2% for hydraulic retention times of 3, 4, and 5 days, respectively. Statistical investigation (ANOVA) showed no significant difference (P > 0.05) in BOD removal efficiencies across HRTs and COD removal for 4 and 5 days. These findings implied diminishing benefits after 4 days for organic matter removal operations. The limited BOD and COD removal, in contrast to other investigations, was due to the short acclimatization time (7 days) for the Typha angustifolia to drive oxygen sufficiency and biofilm formation. These findings underlined the capability of the VFCW system to reduce wastewater contaminants sustainably and economically in tropical areas such as Indonesia. A 4-day HRT is recommended for practical applications in refinery wastewater treatment with pollutant loads up to complement. Extended acclimatization duration and improved operational settings are recommended to enhance the performance of the VFCW. This study illustrates the feasibility of VFCW as a scalable and environmentally sustainable solution for wastewater control in the petroleum industry sector. Keywords: VFCW, organic pollutants, retention time, removal efficiency, acclimatization.
Microwave-assisted extraction of eco-friendly surfactant from Jatropha curcas for sustainable solubilization of reactive dyes Aryanti, Nita; Khoiriyah, Lu'luatul; Nafiunisa, Aininu; Ratnawati; Widiasa, I Nyoman; Zakki, Abdurrahman; Adina, Alifia Rizki
Communications in Science and Technology Vol 10 No 1 (2025)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.10.1.2025.1636

Abstract

Natural surfactants derived from plant-based sources, such as saponins, remain underexplored. This study developed the extraction of saponins from Jatropha curcas leaves using microwave-assisted extraction (MAE) finding that the optimized condition of 3 min, 363.15 K, 30 mL/g ratio of extraction yielded the highest saponin content of 35.04 mg/g. The FTIR and HPLC analyses confirmed the structural similarity between the extract and commercial saponin. Additionally, the extracted saponins effectively solubilized Remazol Red RB and Blue TQ with solubilization efficiency increasing proportionally to the surfactant concentration. The surfactant properties of the extracted saponin were also confirmed by its ability to form foam and high critical micellar concentration, which revealed the potential for material valorization. This work demonstrated that the development of plant-based surfactants provides a sustainable alternative to synthetic surfactants. Moreover, valorizing natural materials contributes to the advancement of eco-friendly technologies, particularly in waste treatment and water purification applications.
Chemically activated biochar derived from mangrove litter with enhanced CO2 adsorption capacity for carbon sequestration Ariyanti, Dessy; Syifa, Viona; Hapsari, Farida Diyah; Widiasa, I Nyoman; Widayat, Widayat; Silviana, Silviana; Purbasari, Aprilina; Setiabudi, Herma Dina; Hamzah, Fazlena
International Journal of Renewable Energy Development Vol 15, No 3 (2026): May 2026
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.62059

Abstract

Overcoming climate change is crucial to ensure environmental sustainability. This research focuses on the development of chemically activated biochar (CAB) from mangrove litters that can be used for CO2 adsorption, which leads to reducing the impacts of climate change. The synthesisation of CAB was carried out via pyrolysis at 400℃ for 2 hours under nitrogen gas flow, followed by treatment using various activating agents (0.1 M of H2SO4, HCl, KOH, and NaOH) for 2 hours with a biochar-to-solution ratio of 1 g : 4 mL. The activation process was designed to enhance surface area, pore characteristics, and functional groups associated with CO2 adsorption performance. The observation on the characteristics of CAB using Scanning Electron Microscope and Energy Dispersive X-Ray (SEM-EDX), The Brunauer, Emmett, Teller and Barret-Joyner-Halenda (BET-BJH), Fourier Transform Infrared Spectroscopy (FTIR), CHN Analyser, and static batch CO2 adsorption tests shows the ability of CAB in capturing CO2 through several possible mechanism. Among the samples, KOH-activated biochar (B-KOH) exhibited the highest CO2 adsorption capacity, reaching 12.47 mmol CO2 g-1 biochar. This high performance is attributed to a potassium (K) composition of 9.74%, which effectively catalyzed the development of a microporous structure, resulting in a micropore volume of 5.927 x 10-3 cm3/g and an optimized average pore width of 1.543 nm. Furthermore, B-KOH maintained the highest O-H group area (1.533 a.u. x cm-1), enhancing its affinity for CO2 molecules. This research offers an innovative and practical solution to reduce greenhouse gases and is expected to have a significant impact, both locally and globally, in advancing sustainable development.
Co-Authors . Widayat A A Susanto A Ardiansyah A Arinaldi Adina, Alifia Rizki Adyaksa, M. Nur Ahmad Fauzi Ismail Ahmad Fauzi Ismail Ali Djunaedi Aprilina Purbasari Ario Budi Kusumo Asteria Apriliani Susanto Ayu Putri Lestari B Budiyono Bambang Pramudono Bayu Satria Utama Berkah Fajar Bernadeta Eka Naftalina Catur Pamularsih Dera Choanji Dessy Ariyanti F Ferdian Febrianto Adi Nugroho Gatra Buana Winiarti Ghina Shofi Pratiwi Hamzah, Fazlena Hapsari, Farida Diyah Hasristuti, Nani Hendrik Wijaya Heny Herawati Heny Herawati Heru Susanto I Gede Wenten Izza Rahmawati Jannah, Rizkiyah Fatikhatul Jayanti, Retno Dwi JS, Ikha Rasti Kendri yanto Kendriyanto Kendriyanto Khoiriyah, Lu'luatul Lestari, Amelia Eka Linda Aliffia Yoshi, Linda Aliffia Luqman Buchori Malida Fauzzia Maria E. Simorangkir Michael MGP Simatupang Miranti Budi Kusumawati Nafiunisa, Aininu Nita Aryanti Noer Abyor Handayani Nur Rokhati Priyo Sasmoko Putri, Tanti Nabella Putu Teta Prihartini Aryanti Rahmanisa, Riang Anggraini RATNAWATI Ratnawati Ratnawati Retno Dwi Jayanti Retno Dwi Jayanti Riang Anggraini Rahmanisa Savero Pakavi Zahrudin Seno Johari Seno Johari Seno Johari Seno Johari Seno Johari Setiabudi, Herma Dina Silviana Silviana Siswo Sumardiono Sunarso . Sunaryo Sunaryo Sunaryo Sunaryo Syifa, Viona Titik Istirokhatun Tito, Adryan Tutuk Djoko Kusworo Wishnu Wijaya Yasmin Nabilah Zakki, Abdurrahman