Publisher: Universitas Ahmad Dahlan   (Total: 6 journals)   [Sort by number of followers]

Showing 1 - 6 of 6 Journals sorted alphabetically
Bulletin of Electrical Engineering and Informatics     Open Access   (Followers: 7)
Chemica : Jurnal Teknik Kimia     Open Access   (Followers: 9)
Intl. J. of Advances in Intelligent Informatics     Open Access   (Followers: 2)
J. of Education and Learning     Open Access   (Followers: 8)
Pharmaciana     Open Access  
TELKOMNIKA (Telecommunication, Computing, Electronics and Control)     Open Access   (Followers: 2, SJR: 0.265, CiteScore: 1)
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Chemica : Jurnal Teknik Kimia
Number of Followers: 9  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2355-875X - ISSN (Online) 2355-8776
Published by Universitas Ahmad Dahlan Homepage  [6 journals]
  • Modification of Purple Sweet Potato Flour Using Hydrogen Rich Water

    • Authors: Gita Indah Budiarti, Ika Dyah Kumalasari, Endah Sulistiawati, Mitha Ulli Rahmatillah, Qaulina Tsabit
      First page: 114
      Abstract: The increasing need for wheat flour in Indonesia needs to be overcome by looking for alternatives to wheat flour. Wheat flour has the disadvantage of high sugar content, so flour from local tubers is needed, which is healthier, namely purple sweet potatoes. The disadvantage of local tubers if they are used as flour is their flourishing power so they need to be modified. Hydrogen rich water (HRW) is alkaline water that can be used to modify starch in purple sweet potato flour. The purpose of the study was to determine the effect of HRW modification on water content, swelling power, ash content and color. The method used is soaking using variable pH (5.9), soaking time (15, 30 minutes) and compared with citric acid 1% with soaking time 30 minutes. The optimal analysis results were obtained at pH 9, soaking time of 30 minutes using HRW with a moisture content of 6%, swelling power of 4.1 g/g, ash content of 10%, the fat content of 13.5%, color L, a, b respectively 65.34; -0.33; 16.03.
      PubDate: 2023-01-16
      DOI: 10.26555/chemica.v9i3.24954
      Issue No: Vol. 9, No. 3 (2023)
       
  • Desalination of Seawater to Reduce Ca2+ and Na+ using Natural Zeolite in
           Vertical Column

    • Authors: Adi Ilcham, Adi Anggara, Anugrah Afzavi Habibilah
      Pages: 120 - 126
      Abstract: Water is a source of life. The ocean contains enormous potential for daily life, especially for people who inhabitants near the sea. Around two-thirds of Indonesia’s territory is the ocean. In certain conditions, the seawater has been applied for some industrial processing such as in Gresik Petrochemical. This study aims to reduce the Ca2+ and Na+ content of seawater as part of desalination. In this study, zeolites were supplied from the Wonogiri region. The zeolite rocks were crushed and then sieved to the desired size. The zeolites were washed with distilled water and then dried for 4 hours at 400 oC in the furnace. Furthermore, the zeolites were activated using NaOH solution and heated at 90 oC. After that the zeolite was neutralized and dried within four hours at 110 oC. Furthermore, the zeolite is ready to be applied as adsorbent for separating Ca2+ and Na+. In the experiment, the zeolite is placed in a vertical column pipe and seawater is poured from the bottom of the pipe continuously. After circulating for a certain time, the seawater coming out from the column was analyzed for Ca2+ and Na+ content. Based on observation, it was found that the decreasing of Ca2+and Na+ could reach of 29.75% and 25.14%.
      PubDate: 2023-01-19
      DOI: 10.26555/chemica.v9i3.25432
      Issue No: Vol. 9, No. 3 (2023)
       
  • Purification of Raw Water from Pollutant using Coupling Membrane
           Filtration to UV Irradiation: Preliminary Study

    • Authors: Dhias Cahya Hakika, Zahrul Mufrodi, Shinta Amelia
      Pages: 127 - 134
      Abstract: The low quality of groundwater, along with the increasing demand for drinking water for the community, encourages the need for water treatment technology to produce quality drinking water that is environmentally friendly. One promising method to be applied is membrane technology. In water treatment systems, membrane technology is often not used alone but combined with other methods to improve water quality more effectively. This study aims to apply several methods for the raw water treatment system to drinking water, including membrane filtration and UV irradiation. The removal of chemical pollutants was investigated and compared to the standard value from Minister of Health Regulation No. 492 Year 2010 for drinking water quality. This coupled treatment successfully improved the water quality. The concentration of chemical and biological pollutants such as total dissolved solids (TDS), Fe, Zn, Pb, and total Coliform were reduced by 58.53%; 43.48%; 88.89%; 66.67%.; and 86.15%, respectively. The results indicate that coupling microfiltration membrane to UV irradiation method can be an effective treatment to remove chemical pollutants and enhance the quality of raw water for drinking water preparation.
      PubDate: 2023-01-23
      DOI: 10.26555/chemica.v9i3.25212
      Issue No: Vol. 9, No. 3 (2023)
       
  • Rubber Industry Wastewater Treatment Using A Combination Of Ozonation And
           Modified PES-Nano ZnO Membranes

    • Authors: Enny Nurmalasari, Tutuk D. Kusworo, Miftahul Khairati
      Pages: 135 - 142
      Abstract: Until now, the application of a combination of biological, physical, and chemical methods to eliminate contaminants from the rubber industry wastewater has not been reported. The purpose of our investigation is to analyze the use of membrane techniques and the effect of pre-treatment of industrial rubber wastewater—pre-treatment by ozone on the performance of the modified PES-nano ZnO membrane. Modified PES-nano ZnO membranes were made with phase inversion techniques and membrane performance based on flux and rejection. Filtration processes with cross-flow filtration systems and ozonation time variations were 1, 2, 3 hours. The ozonation process influenced membrane rejection. The membrane rejection value increased to 89.6%, and ammonia decreased to 4.3 mg/L. The flux value increased to 10.2 L.M-2.h-1 in 1h Ozonatian and decreased with the increasing of filtration time. Pre-treatment with ozonation can increase membrane selectivity and extend membrane life during the filtration process due to reduced fouling. The pre-treatment process time with 3 hours-ozonation was the most violent rejection even though the flux value has decreased
      PubDate: 2023-01-29
      DOI: 10.26555/chemica.v9i3.24658
      Issue No: Vol. 9, No. 3 (2023)
       
 
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