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PENGARUH VARIASI JENIS ABU BOILER DAN KOSENTRASI HCl TERHADAP SIFAT FISIS SILIKA GEL HASIL SINTESIS Meidinariasty, Anerasari; Purnamasari, Indah; Zamhari, Mustain; ., Fadarina; Permadi, Jekasyah; Fadillah, Nadia Zaky; Luthfiah, Sakinah
KINETIKA Vol. 11 No. 3 (2020): KINETIKA 01112020
Publisher : Politeknik Negeri Sriwijaya

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Efforts to minimize environmental pollution caused by solid waste in the form of boiler ash are managed and reused into new materials that have economic value. Boiler ash has a high enough silica content which can be used as an alternative raw material for making adsorbents in the form of silica gel. This study aims to synthesize silica gel from variations of boiler ash and determine the effect of HCl concentration on its physical properties. The boiler ash used comes from PT Tanjungenim Lestari Pulp and Paper, PT Pupuk Sriwidjaja and PT Sriwijaya Palm Oil Indonesia. Silica gel synthesis was carried out by extracting boiler ash with 3 M NaOH solution for 1 hour, then the extraction results in the form of Sodium Silicate were precipitated using HCl with various concentrations of 1, 3 and 5 M. The physical properties of the synthesized silica gel were analyzed by analyzing the SiO2 content, water content, and absorption capacity of water vapor. The effect of HCl concentration on the physical properties of the synthesized silica gel showed the highest yield value in SG PP, SG PS, and SG PO respectively amounted to 15.6176%, 21.6115% and 24.5215%.The highest SiO2 content value in a row in SG PP, PS SG and SG PO amounted to 39.48%, 52.73% and 50.74%.
EFISIENSI MESIN PENGERING BEKU VAKUM PADA PENGERINGAN CABAI MERAH (Capsicum annuum L.) ., Fadarina
KINETIKA Vol. 11 No. 1 (2020): KINETIKA 01032020
Publisher : Politeknik Negeri Sriwijaya

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Vacuum freeze drying is a drying method performed at low temperature, reducing product damage caused by high temperature. Red chilies are highly perishable and seasonal, so farmers who have applied the recommended cultivation technology will produce large quantities of chilies at harvest time. This study aimed to design a vacuum freeze dryer, obtained the performance of the dryer based on the efficiency of the cooling machine, and obtained red chilies that met the water content standards based on SNI No. 01-3389-1994. The parameters measured for the cooling machine performance including time, temperature of the evaporator inlet and outlet, temperature of the condenser inlet and outlet. For red chilies drying, the measured parameters were drying temperature with variations 40oC, 45oC, 50oC, and 55oC for 13 hours. Based on the test result, the design of this vacuum freeze dryer had a maximum capacity of 6.52 L for the cold room and 3 L for the heating room. The average of the actual COP, Carnot COP, and refrigeration efficiency were 3.33, 6.18, and 53.71%respectively. The dried chilies produced met the moisture content in accordance with SNI No. 01-3389-1994, namely at temperature 50oC and 55oC with water content of 10.66% and 9.50%respectively.
PENGOLAHAN AIR PAYAU MENJADI AIR BERSIH MENGGUNAKAN METODE ELEKTROKOAGULASI Kaslum, Leila; ., Fadarina; Meidinariasty, Anerasari; Yuliati, Selastia; Syakdani, Adi; Pratama, M.Bagas; Alpitansyah, Rachmad Bayu; Alnafrah, Fenty; Ismareni, Pepi
KINETIKA Vol. 12 No. 1 (2021): KINETIKA 01032021
Publisher : Politeknik Negeri Sriwijaya

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The limitation of clean water resources in coastal areas is related to the scarcity of fresh water. Water that has too high a salinity can cause harm if it is used for certain activities, for example, it is dangerous for health when used as drinking water, causing crop failure for agriculture, corrosion for equipment and buildings made of metal elements. In order to be used as clean water and suitable for daily household use, brackish water needs special treatment with the aim of reducing the mineral content in it, especially in reducing salinity levels. For this purpose brackish water treatment has been made into clean water which works based on the electrocoagulation process. The performance test was carried out by filling 10 liters of brackish water into the electrocoagulation reactor and using an electric current of 10 volts, 12 volts and 14 volts for each test. The observation times for each test were 60, 120 and 180 minutes. Measurement of salinity, iron, sulfate and organic substances for each test was carried out using a potentiometer, atomic absorption spectrophotometer, turbidimeter, and titrimetry. The optimum results of the test show that the use of 14 volts of electricity and contact time for 120 minutes can reduce iron levels from 1.41 mg / l to 0.98 mg / l, and sulfate levels from 301.97 mg / l to 235.84 mg. / l, levels of organic substances from 3.05 mg / l to 2.25 mg / l and salinity levels from 16.25 ppt to 10.07 ppt.
Co-Authors Alnafrah, Fenty Alpitansyah, Rachmad Bayu Anerasari Meidinariasty Fadillah, Nadia Zaky Indah Purnamasari Ismareni, Pepi Kaslum, Leila Luthfiah, Sakinah Mustain Zamhari Permadi, Jekasyah Pratama, M.Bagas Selastia Yuliati Syakdani, Adi