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All Journal Venn: Journal of Sustainable Innovation on Education, Mathematics and Natural Sciences KOLONI Jurnal Teknologi Kimia Mineral
Pampang, Harun
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Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Education Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences Other

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Efektivitas Penggunaan Poli Aluminium Klorida (PAC) dan Aluminium Sulfat (Tawas) Dalam Pengolahan Limbah Cair Industri pada Waste Water Treatment Plant (WWTP) PT. KIMA Makassar dengan Metode Koagulasi Menggunakan Jar Test Pampang, Harun; Ole, Maria Assumpta Nogo; Darajat, Zakiyah
KOLONI Vol. 1 No. 4 (2022): DESEMBER 2022
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/koloni.v1i4.280

Abstract

Wastewater in industrial areas has various contents. The levels of pollutant substances in waste water have been regulated in industrial area waste water quality standards stipulated in Government Regulations. One method used to achieve quality standards is a chemical process, namely adding chemicals as coagulants using a jar-test machine. In this study, the coagulation process of liquid waste from PT. Makassar Industrial Area with the addition of polyaluminium chloride (PAC) and aluminum sulfate (alum) which aims to study the effectiveness of using two types of coagulants with variations of 0.02, 0.04, 0.06, and 0.08 grams in 500mL of wastewater. After 1 minute fast stirring and 10 minutes slow stirring then leaving for 10 minutes, the TSS test showed that the addition of alum was able to reduce TSS better than the addition of PAC. The addition of 0.04 grams of alum resulted in an effectiveness of 91.71%, while for PAC the best results were the addition of 0.06 grams of coagulant with an effectiveness of 46.13%. Keywords: coagulation, jar-test, alum, PAC, wastewater treatment
Perbandingan Hasil Delignifikasi Jerami Padi menggunakan Natural Ternary Deep Eutectic Solvent dengan Variasi Penambahan Air Ole, Maria Assumpta Nogo; Ranggina , Dian; Pampang, Harun; Yunus, Muhammad Arham; Darajat, Zakiyah; Septiani, Mimin; Maharani , Andina Sari; Cincing, Andi Ahmad Maulana Senna; Pertiwi, Sherlina Zalfa; Bala, Dwi Ferel Imanuel
JURNAL TEKNOLOGI KIMIA MINERAL Forthcoming issue
Publisher : Politeknik ATI Makassaar

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Abstract

Jerami padi, sebagai hasil samping pertanian yang melimpah di Indonesia, memiliki potensi besar sebagai bahan baku untuk produksi energi terbarukan seperti biohidrogen dan bioetanol. Kandungan lignin dalam biomassa menghambat hidrolisis sehingga perlu dikurangi; untuk itu penelitian ini mengembangkan metode delignifikasi menggunakan Natural Ternary Deep Eutectic Solvent (NATDES) yang tersusun dari kolin klorida, asam laktat, dan asam sitrat pada rasio molar 0,1:0,6:0,3 dengan variasi penambahan air 0–20% (v/v). Perlakuan dilakukan pada rasio padatan:pelarut 1:10 (w/v) dalam reaktor pada 121 °C. Analisis FTIR pada residu padatan menunjukkan kadar lignin terendah (0,72%) pada perlakuan dengan 20% air, yang mengindikasikan bahwa penambahan air menurunkan viskositas NATDES dan meningkatkan efisiensi delignifikasi. Analisis gula pereduksi menggunakan metode dinitrosalisilat (DNS) menunjukkan bahwa kadar gula pereduksi terlarut tidak maksimal pada perlakuan 20% air akibat adanya fenolik bebas hasil degradasi lignin; oleh karena itu perlakuan pra‑analitik untuk assay DNS perlu dioptimalkan untuk menghilangkan interferensi fenolik, furfural, dan kekeruhan serta memastikan kuantifikasi gula pereduksi yang akurat. Hasil penelitian ini menunjukkan perlunya optimasi kandungan air dalam formulasi NATDES untuk meningkatkan potensi NATDES sebagai pelarut hijau untuk mendukung konversi jerami padi yang lebih bersih dan efisien.
Kinetics of BTX Removal by Rhodococcus Erythropolis in a Slurry Bioreactor Ole, Maria Assumpta Nogo; Ranggina, Dian; Pampang, Harun; Darajat, Zakiyah
Venn: Journal of Sustainable Innovation on Education, Mathematics and Natural Sciences Vol. 5 No. 2 (2026): Biology, Physics, Chemistry, and other Basic Sciences
Publisher : Pusat Studi Bahasa dan Publikasi Ilmiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53696/venn.v5i2.421

Abstract

Benzene, toluene, and xylene (BTX) contamination arising from oil-drilling operations constitutes a persistent environmental challenge, necessitating the development of robust bioremediation strategies underpinned by kinetic evaluation. This study systematically investigated the kinetics of BTX removal by Rhodococcus erythropolis in a slurry-phase bioreactor employing soil sourced from the PPEJ oil-drilling site in Tuban, Indonesia, with particular emphasis on the influence of inoculum concentration on the k₀ and the Kₘ. Batch experiments were conducted at inoculum loadings of 12,5%, 15%, and 17,5% (v/v), with periodic monitoring of dissolved-phase BTX concentrations and BOD. Analytical methodologies encompassed gas chromatography–mass spectrometry (GC–MS) for the quantification of BTX and intermediate metabolites, BOD assessment, and kinetic modeling to estimate k₀ and Kₘ values. The results demonstrated that incremental increases in inoculum concentration consistently elevated the k₀, thereby expediting BTX removal in reactors with higher biomass. However, a concomitant decline in specific activity per unit biomass was observed at the highest inoculum level, attributable to mass-transfer limitations—specifically, restricted diffusion of oxygen and substrate into microbial flocs—and heterogeneity in enzyme induction. The estimated Kₘ values exhibited variability across inoculum concentrations, indicating that substrate affinity is modulated by reactor physical parameters and microbial enzymatic adaptation. These findings underscore the necessity of optimizing inoculum concentration in concert with operational parameters such as dissolved oxygen control, agitation intensity, and structured kinetic assays to ensure that enhancements in k₀ are translated into effective per-cell degradation and complete mineralization of BTX contaminants in soils impacted by oil-drilling activities.
Co-Authors Bala, Dwi Ferel Imanuel Cincing, Andi Ahmad Maulana Senna Dian Ranggina Maharani , Andina Sari Ole, Maria Assumpta Nogo Pertiwi, Sherlina Zalfa Ranggina , Dian Septiani, Mimin Yunus, Muhammad Arham Zakiyah Darajat