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All Journal CHEESA: Chemical Engineering Research Articles Indonesian Journal of Multidisciplinary on Social and Technology
Irawan Rusnadi
Politeknik Negeri Sriwijaya
Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Economics, Econometrics & Finance Engineering Social Sciences

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Reducing Silica Levels in WTP PLTGU X Wastewater using Rice Husk Filter Membranes Indah Agus Setiorini; Indah Pratiwi; Irawan Rusnadi; Amiliza Miarti; Achmad Faisal Faputri; Dian Kurnia Sari; Reco Rambang Putra Negsagis
CHEESA: Chemical Engineering Research Articles Vol. 7 No. 2 (2024)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v7i2.15576.103-110

Abstract

During the water demineralization process, silica content is increased due to the failure of the chemical reagent. This shows the need to perform a blowdown action to reduce silica content in the water. Therefore, this research aimed to determine the effectiveness of silica reduction in the Water Treatment Plant (WTP) of PLTGU X by observing the permeate flux values relative to time and operating pressure variables, using ceramic membrane made from rice husk. To achieve the objective, ceramic membrane was made from rice husk additives, with a pore diameter of 365 nm and a surface area of 25 cm². The results showed that the composition ratio of clay, rice husk, and iron powder was 82.5%, 15%, and 2.5%, respectively. Furthermore, ceramic membrane with rice husk additives successfully reduced silica content from 1250 ppb to 890 ppb at a pressure of 1.5 bar and 90 minutes of operation and from 1250 ppb to 710 ppb at 2 bar and 90 minutes of operation. This suggested that wastewater could be processed again in the demineralization plant to produce demineralized water. The best membrane performance in the filtration process was achieved at 90 minutes with a pressure of 2 bar, which successfully reduced silica content by 43.2%, with a permeate flux of 3.44 L/m².
Analisis Pengaruh Temperatur terhadap Yield dan Karakteristik Bio-Oil Hasil Pirolisis Plastik HDPE dan Serbuk Kayu Pinus Menggunakan Katalis Bentonit Alfarizky Pradirga; Dwi Lestari; Irawan Rusnadi; Lety Trisnaliani; Rima Daniar
Indonesian Journal of Multidisciplinary on Social and Technology Vol. 4 No. 3 (2026): Juli - Oktober
Publisher : PT Ilmu Data Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69693/ijmst.v4i3.12560

Abstract

Penumpukan sampah plastik dan limbah biomassa yang belum dimanfaatkan secara optimal merupakan permasalahan lingkungan yang memerlukan solusi berkelanjutan. Penelitian ini bertujuan menganalisis pengaruh temperatur operasi terhadap yield dan karakteristik bio-oil hasil pirolisis campuran plastik High Density Polyethylene (HDPE) dan serbuk kayu pinus dengan rasio 2:1 menggunakan katalis bentonit. Proses pirolisis dilakukan pada reaktor fixed bed dengan variasi temperatur 250°C, 300°C, 350°C, 400°C, dan 450°C, massa bahan baku 2 kg, katalis bentonit 10% dari massa bahan baku, serta waktu operasi 120 menit. Karakteristik bio-oil yang dianalisis meliputi densitas, viskositas, nilai kalor, titik nyala, serta komposisi senyawa menggunakan Gas Chromatography-Mass Spectrometry (GC-MS). Hasil penelitian menunjukkan bahwa peningkatan temperatur operasi meningkatkan yield bio-oil dari 10,04% pada 250°C menjadi 13,02% pada 450°C. Densitas bio-oil menurun dari 0,7970 g/ml menjadi 0,7405 g/ml, sedangkan nilai kalor meningkat dari 8.083 cal/g menjadi 8.942 cal/g seiring kenaikan temperatur. Viskositas berfluktuasi pada rentang 3,01–6,77 cP dan titik nyala berada pada rentang 33,1–38,2°C. Kondisi operasi optimum diperoleh pada temperatur 450°C dengan yield 13,02%, densitas 0,7405 g/ml, viskositas 3,53 cP, nilai kalor 8.942 cal/g, dan titik nyala 33,1°C. Analisis GC-MS menunjukkan bio-oil didominasi oleh fraksi bensin (42,23%) dan fraksi solar (38,49%), diikuti fraksi kerosin (13,18%) dan fraksi pelumas (6,12%). Hasil ini menunjukkan bahwa campuran plastik HDPE dan serbuk kayu pinus berpotensi dikembangkan sebagai bahan baku bahan bakar cair alternatif, meskipun masih memerlukan proses upgrading lanjutan agar sesuai standar bahan bakar komersial.
Co-Authors Achmad Faisal Faputri Alfarizky Pradirga Amiliza Miarti Dian Kurnia Sari Dwi Lestari Indah Agus Setiorini Indah Pratiwi Lety Trisnaliani Reco Rambang Putra Negsagis Rima Daniar