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Rosalia Sira Sarungallo
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Journal : paulus chem engineering journal

 1 
Metode Elektrokoagulasi Untuk Pengolahan Limbah Cair Laboratorium Yang Mengandung Logam-Logam Berat Marthen Joning; Lydia Melawaty; Rosalia Sira Sarungallo
Paulus Chem Engineering Journal Vol 1 No 1 (2022): Vol.1 No.1 Juni 2022 Paulus Chemical Engineering Journal
Publisher : Prodi Teknik Kimia

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Abstract

In this research several variations of process variables such as pH, time and voltage were carried out to observe operating conditions that were more effective in reducing pollutants in wastewater. Before the electrocoagulation process was carried out the initial characterization of the waste using the ICP-OES analysis method and obtained the results of the initial concentration of pollutants such as TSS = 119 mg / L, Iron metal (Fe) = 24,453 mg / L, Copper (Cu) = 9,732 mg / L, Lead (Pb) = 0.309 mg / L and Selenium (Se) = 0.052 mg / L. The characterization of the wastewater pollutants does not meet the quality standards of liquid waste to be flowed to the environment based on Environmental Ministerial Regulation No. 05 of 2014. After going through the processing process by electrocoagulation method, pollutants of suspended solids and metals can be reduced in concentration to: TSS = 32 mg / L, ferrous metal (Fe) = 0.003 mg / L, Copper (Cu) = 0.074 mg / L, Lead (Pb) = 0.023 mg / L, and Selenium (Se) almost close to zero. Based on the data of pollutant concentrations in waste before and after the electrocoagulation process, it can be stated that the electrocoagulation method is effective in reducing Total Suspended Solid (TSS) pollutant levels by 73.12%, Iron (Fe) metals by 99.99%, Copper (Cu)) by 99.24%, Lead (Pb) by 92.56%, Selenium (Se) by 99.81%. The results were obtained under operating conditions at 10 volt voltage, 10 minutes time and pH 9. the electrocoagulation method produced the quality of wastewater that meets the requirements for drainage of the environment based on waste water quality standards according to the Environmental Ministerial Regulation No. 05 of 2014.
Produksi Bioethanol Berbasis Nira Sorgum Manis (Sorghum Bicolor) Melalui Rekayasa Bioproses Pada Kultivasi Batch dan Destilasi Satu Tahap Grace Ananda; M Saleh; Rosalia Sira Sarungallo
Paulus Chem Engineering Journal Vol 1 No 1 (2023): Vol.1 No.1 Agustus 2023 Paulus Chem Engineering Journal
Publisher : Prodi Teknik Kimia

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The purpose of this research in general is to obtain a productive and efficient bioethanol production process technology through bioethanol production engineering of the Sweet sorghum Nira (Sorghum bicolor) using Saccharomyces cerevisiae in Batch cultivation. This research is specifically aimed at; Determining the concentration of sugar and bioethanol at the end of fermentation to nira sorghum sweetened with presses and extraction; Determinethe optimization of the column height (the volume Destilat) bioethanol distillation tool against the yield and rendament. Nira Sweet Sorghum (Sorghum bicolor) potentially as the raw material ofbioethanol production. In this study the varieties used were sweet Sorghum Super 1, with a brix sugar content of 6% through the stage of pressing of the sorghum stem and 3% through the extraction stage of the sorghum rod. The level of bioethanol obtained after fermentation is 19% in the pressing process and 10% in the extraction process. Based on the results of studies that have been done in this study, it can be concluded that: the highest bioethanol summation is the result of distillation by using a column height of 44 cm (ordinary distillation apparatus) of 75% of the pressing result. The highest bioethanol rendament is 0.722% by using a column height of 44cm (ordinary destillation). Bioethanol Yield is 4.3% by using a column height of 44cm (ordinary destillation)
ANALISIS DAN PERBANDINGAN KADAR Ni, Fe2O3, dan SiO2 PADA BIJIH NIKEL LATERIT BERDASARKAN JENIS SAMPEL DI WILAYAH MALUKU UTARA Jane Aprilia Mege; Febriani Kadang; M. Saleh; Rosalia Sira Sarungallo
Paulus Chem Engineering Journal Vol 6 No 1 (2026): Vol.6 No.1 Februari 2026 Paulus Chem Engineering Journal
Publisher : Prodi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63365/vxm1et10

Abstract

Bijih nikel laterit merupakan sumber mineral yang berperan dalam industri pengolahan dan hilirisasi nikel di Indonesia, khususnya di kawasan Maluku Utara. Variasi kadar unsur nikel (Ni), besi oksida (Fe2O3), dan silika (SiO2) pada bijih nikel laterit dipengaruhi oleh proses laterisasi dan jenis material, sehingga karakteristik kimia dibutuhkan untuk pengendalian kualitas bahan baku. Penelitian ini bertujuan untuk menganalisis dan membandingkan kadar Ni, Fe2O3, dan SiO2 pada bijih nikel laterit berdasarkan perbedaan jenis sampel, yaitu sampel batu, sampel tanah, dan sampel campuran yang berasal dari wilayah Maluku Utara, meliputi Ternate, kawasan industri pertambangan di Halmahera, dan pulau-pulau sekitarnya. Metode penelitian meliputi pengambilan sampel di lapangan, preparasi sampel melalui proses pengeringan, penghalusan ukuran 200 mesh, serta pembentukan pelet. Analisis kimia dilakukan menggunakan instrumen Energy Dispersive X-Ray Fluorescence (ED-XRF) untuk menentukan kadar Ni, Fe2O3, dan SiO2. Hasil penelitian menunjukkan bahwa kadar Ni dan Fe2O3 sampel tanah lebih tinggi serta kandungan SiO2 yang lebih rendah dibandingkan sampel batu dan sampel campuran, sehingga menunjukkan kualitas bijih nikel laterit yang paling baik. Sampel campuran menunjukkan karakteristik campuran material dengan tingkat laterisasi yang berbeda, sedangkan sampel batu  kualitas terendah karena sifat batuan ultramafik dan kandungan silika yang tinggi. Karakteristik bijih nikel laterit di Maluku Utara yang diperoleh dapat dimanfaatkan untuk pengendalian kualitas bijih serta perencanaan penambangan dan pengolahan yang lebih tepat dan berkelanjutan.
Co-Authors Febriani Kadang Grace Ananda Jane Aprilia Mege Lydia Melawaty M Saleh M. SALEH Marthen Joning