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Evaluasi Perbandingan Kinerja Attached Culture Bioreaktor dan Hybrid Membran Bioreaktor dalam Mendegradasi Air Limbah Juniawan, Asyhar Sururi; Budhijanto, Wiratni; Marbelia, Lisendra
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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Restaurant wastewater is categorized as grey wastewater, which is low strength wastewater with a chemical oxygen demand (COD) concentration of <1,000 mg/L. Therefore, further treatment is necessary before it is discharged into the environment. This study focused on comparing the performance of an attached culture bioreactor and a Hybrid Membrane Bioreactor (HMBR) in degrading restaurant wastewater. The bioreactors used a mesh filter support media of 70-80 μm. The bioreactors were operated with COD feed concentration 600 ppm and HRT 13 hour, with artificial grey water waste feed consisting of sugar, urea, KH2PO4, and tapioca flour. The %COD removal achieved by the attached culture bioreactor and HMBR was 90,48% – 90,95% and 96,28%– 96,79%, the turbidity out achieved by the attached culture bioreactor and HMBR was 57,42 – 60,25NTU and 4,95 – 5,62NTU, MLSS value reached 2,36 – 2,86ppm and 2,36 – 2,86ppm. The conclusion of this research shows that the HMBR has relatively better performance than the attached culture bioreactor

Efisiensi air di gas conditioning tower untuk mengurangi kadar SO2 pada emisi industri semen Sitohang, Osvaldo Zulbedia; Suryana; Listianingrum, Erna; Marbelia, Lisendra
Jurnal Rekayasa Proses Vol 17 No 1 (2023): Volume 17, Number 1, 2023
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.78193

Industri kimia dan juga termasuk di dalamnya, industri semen, menghadapi tantangan untuk dapat terus melakukan perbaikan proses untuk melakukan efisiensi sumber daya dan meminimalkan beban pencemaran ke lingkungan. Salah satu hal yang penting di industri semen adalah kandungan SO2 pada emisinya. Kandungan emisi ditentukan oleh proses pengolahan gas, yang dilakukan dengan penyemprotan air di gas conditioning tower (GCT) dan bag filter sebelum dikeluarkan ke lingkungan melalui cerobong. Di sisi lain, konsumsi air di GCT merupakan salah satu titik penggunaan air yang tertinggi di industri semen. Studi ini bertujuan untuk menganalisis efisiensi penggunaan air di GCT dengan menggunakan seven tools mulai dari analisis masalah hingga pembuatan usulan standard operating procedure (SOP) baru. Dari analisis ini didapatkan bahwa tergantung pada kadar SO2 dan SO3 di emisi dan bahan baku, maka dapat dilakukan pengendalian temperatur inlet bag filter yang selanjutnya akan mengendalikan volum air di GCT. Hasil pengembangan/inovasi ini menunjukkan bahwa SOP baru dapat menghemat air di GCT secara signifikan.

Kajian Tingkat Pencemaran pada Efluen Air Limbah IPAL - IPAL Domestik Komunal Ditinjau dari Parameter COD, BOD, Amonia dan Total Coliform di Sleman, Yogyakarta Nugroho, Muhammad Luthfi; Ahmad, Johan Syafri Mahathir; Marbelia, Lisendra
Prosiding Seminar Nasional Teknik Sipil UMS 2023: Prosiding Seminar Nasional Teknik Sipil UMS
Publisher : Universitas Muhammadiyah Surakarta

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Pencemaran air limbah di Kabupaten Sleman merupakan dampak dari permasalahan sanitasi. Saat ini IPAL – IPAL Domestik Komunal di Sleman menjadi alternatif untuk pengolahan air limbah domestik. Setidaknya terdapat 56 IPAL Domestik yang memiliki efluen air limbah yang tidak memenuhi baku mutu. Efluen IPAL ini diduga menjadi kontribusi terhadap peningkatan tingkat pencemaran perairan di Sleman. Oleh karena itu, penelitian terkait tingkat pencemaran efluen IPAL diperlukan. Penelitian menggunakan metode analisis konsentrasi polutan, analisis kinerja penyisihan dan analisis indeks pencemaran. Hasil penelitian didapatkan bahwa >50% IPAL untuk kualitas efluen COD, BOD dan Amonia masih memenuhi baku mutu yang dipersyaratkan. Namun, 56 IPAL (100% jumlah total IPAL) masih belum memenuhi baku mutu untuk Total colifrom. Kedua, 56 IPAL masih memiliki kinerja penyisihan polutan COD, BOD, Amonia dan Total coliform yang rendah (<80% efisiensi). Terkakhir, kenaikan tingkat pencemaran IPAL cenderung signifikan tiap tahunnya dan secara rerata kumulatif dari tahun 2017 sampai tahun 2022 terdapat 52 IPAL tercemar berat.

Evaluasi Perbandingan Kinerja Attached Culture Bioreaktor dan Hybrid Membran Bioreaktor dalam Mendegradasi Air Limbah Juniawan, Asyhar Sururi; Budhijanto, Wiratni; Marbelia, Lisendra
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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

Restaurant wastewater is categorized as grey wastewater, which is low strength wastewater with a chemical oxygen demand (COD) concentration of <1,000 mg/L. Therefore, further treatment is necessary before it is discharged into the environment. This study focused on comparing the performance of an attached culture bioreactor and a Hybrid Membrane Bioreactor (HMBR) in degrading restaurant wastewater. The bioreactors used a mesh filter support media of 70-80 μm. The bioreactors were operated with COD feed concentration 600 ppm and HRT 13 hour, with artificial grey water waste feed consisting of sugar, urea, KH2PO4, and tapioca flour. The %COD removal achieved by the attached culture bioreactor and HMBR was 90,48% – 90,95% and 96,28%– 96,79%, the turbidity out achieved by the attached culture bioreactor and HMBR was 57,42 – 60,25NTU and 4,95 – 5,62NTU, MLSS value reached 2,36 – 2,86ppm and 2,36 – 2,86ppm. The conclusion of this research shows that the HMBR has relatively better performance than the attached culture bioreactor

Used Lubricating Oil Treatment and Reuse for Sustainable Production Processes in Cement Industry Lestianingrum, Erna; Marbelia, Lisendra
Eksergi Vol 22 No 1 (2025)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v22i1.12477

Used lubricating oil is one type of hazardous waste produced in the chemical industry, including the cement industry. PT. ITP Unit Palimanan has obtained a permit to process hazardous waste in the form of used lubricant oil since February 21, 2023. Therefore, starting from March 2023, PT. ITP Unit Palimanan has been utilizing used lubricant oil for open chain lubrication. The used lubricant oil, which is dark in color and contains a high amount of particles, is reprocessed through a filtration process before being used. In this process, the contaminating particles are reduced, and the used lubricant oil can be reused as lubrication material for open chains within PT. ITP Unit Palimanan itself. In 2019-2021, the average total generation of used lubricant oil was around 125 tons per year. Of this amount, approximately 90% was suitable for reuse as it contained metal and water levels below the threshold limits. Through this reuse process, the substitution of lubricant oil for open chain equipment can be reduced by 95.5%, equivalent to Rp 1,514,556,289 per year or Rp 4,207,101 per day. Besides the cost savings, PT. ITP Unit Palimanan can significantly reduce the burden of used lubricant oil waste on the environment through this innovation.

Comparative Study of the Single and Double-Stage Thermochemical Pretreatment of Gracilaria sp. for Biogas Feedstock Prastyo, Elli; Cahyono, Rochim Bakti; Marbelia, Lisendra; Budhijanto, Wiratni
Journal of Engineering and Technological Sciences Vol. 58 No. 1 (2026): February 2026 (In Progress)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.1.6

The objective of this study was to evaluate the effects of single-stage thermochemical pretreatment using sodium hydroxide (NaOH) and a double-stage pretreatment combining NaOH and hydrochloric acid (HCl) on the production of reducing sugars and total phenolic compounds (TPC). The influence of pretreatment duration (30–120 minutes) and solvent concentration (NaOH: 0.2–1 N; HCl: 0.05–0.4 N) at 100 °C was systematically investigated. The results showed that the double-stage pretreatment led to a higher yield of reducing sugars while maintaining relatively low TPC levels. Analysis of variance (ANOVA) revealed that, in the single-stage pretreatment, NaOH concentration had a more pronounced effect than treatment duration. Conversely, in the double-stage pretreatment, duration had a greater influence than HCl concentration. Overall, the double-stage pretreatment, involving NaOH-induced delignification followed by acid-catalyzed hydrolysis, offers a promising strategy for the efficient conversion of macroalgae into reducing sugars while minimizing phenolic compound accumulation.

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