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All Journal Reaktor Jurnal Teknologi Mineral dan Batubara WIDYA LAKSANA
Aryanti, Putu Teta Prihartini
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Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Materials Science & Nanotechnology Other

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OPTIMASI PERSEN BINDER, BEBAN KOMPAKSI, DAN SUHU SINTERING DALAM PEMBUATAN BATU BATA TINGGI ALUMINA MENGGUNAKAN APLIKASI RSM (RESPONSE SURFACE METHODOLOGY) Dianawati, Erika Arum; Sirait, Phichiato; Wibawa, Aditya; Husaini; Aryanti, Putu Teta Prihartini
Jurnal Teknologi Mineral dan Batubara Vol 20 No 1 (2024): Jurnal Teknologi Mineral dan Batubara Edisi Januari 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No1.2024.1522

Abstract

PT Indonesia Chemical Alumina (ICA) is a company that produces 300,000 tons of chemical grade alumina (CGA) per year. Of this amount, there is an average of 15,000 tons that do not meet market specifications every year. Alumina that does not meet this specification is only piled up by PT. ICA and takes up space, so it is economically detrimental to the company because they have to provide space to accommodate it. In fact, this alumina has a very high Al2O3 content and is in the form of an alpha phase or α-Al2O3 which is the most stable phase at the highest temperatures, so it can be processed into useful materials and has high added value such as high alumina bricks through compaction and sintering. Process conditions such as percent binder, load during compaction and sintering temperature greatly affect the quality of the high alumina bricks produced. The purpose of this study is to optimize the process conditions for making high-alumina bricks by identifying the relationship between input variables and the measured responses and developing a prediction model for experimental variations that will be used in optimizing the process conditions for the manufacture of high alumina bricks. The Design Expert 7.0® program with Box-Behnken Design Response Surface Methodology (RSM) is used to research and select process conditions from a combination of factor levels that produce an optimal response. Based on RSM Box-Behnken Design it is known that the main effects of binder percentage, compaction load and sintering temperature are factors that greatly influence the response value of high alumina bricks. The optimal response value for high alumina bricks is a compressive strength of 8.2229 MPa, with a process condition of 3% binder percent, a compacting load of 10 tons and a sintering temperature of 1600ºC.
Gravity-Based PVC/PVP/SiO2 Membrane for River Water Treatment Aryanti, Putu Teta Prihartini
Reaktor Volume 24 No.1 April 2024
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.24.1.28-35

Abstract

In this study, UF-GDM membranes are made from PVC (12-14% weight), which is mixed with PVP (0-5% weight) and SiO2 (1-3% weight) in a DMAc solvent. The results showed that the PVC/PVP/SiO2 membrane formulation 12/5/1 produced a membrane with the lowest water contact angle of 55° and a permeate flux of 34 L.m-².h-1. However, the membrane is more susceptible to fouling, characterized by a 21% decrease in flux during 5 hours of operation. This is due to the large porosity of the membrane (84%). PVC/PVP/SiO2 formulations 14/2,5/1 showed the highest decrease in contaminants (turbidity above 99.9%, TDS of 47-51%, conductivity of 96%, and organic matter of 97.5%), but low permeate flux (8 L.m-².h-1) due to tighter membrane pores and high flux decrease (20%) due to fouling. The best formulation was obtained in a 12/2,5/1 PVC/PVP/SiO2 composition, with a more stable flux (37 L.m-².h-1) and a decrease of 9% over 5 hours. This formulation also showed a decrease in TDS of 38%, turbidity of 99.9%, conductivity of 96%, and organic substances of 98%. With clear water results, this formulation has the potential to be further developed in the manufacture of membranes for environmentally friendly and energy-efficient clean water supply.
UNIT TERINTEGRASI ELEKTROKOAGULASI DAN ULTRAFILTRASI UNTUK PENGOLAHAN LIMBAH CAIR TEMPE DI KELURAHAN CIMAHI, KECAMATAN CIMAHI TENGAH Aryanti, Putu Teta Prihartini; Nugroho, Febrianto Adi; Susilowati, Susilowati
JURNAL WIDYA LAKSANA Vol 9 No 2 (2020)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (520.26 KB) | DOI: 10.23887/jwl.v9i2.24309

Abstract

Cimahi Subdistrict in Cimahi City, Indonesia has two problems related to clean water and tempeh industry wastewater. The communities Cimahi Subdistric used groundwater that contains high concentration of organic compounds as well as dissolved minerals. Meanwhile, the liquid waste from tempe industry was not treated properly, and consequently, it polluted the river when disposed directly. This activity provided technology to solve the mentioned problems in Cimahi Subdistrict, namely ultrafiltration (UF) and integrated electrocoagulation - ultrafiltration (EC-UF) units. In groundwater treatment using UF membrane, the water product meet drinking water quality standards. The integrated EC-UF reduced the turbidity levels of tempeh industry wastewater to below 5 NTU and BOD by 60%. The EC units can be integrated with biological process as the second treatment to produce more clean effluent. This technology can be used as an alternative of green technology for water and industrial wastewater treatment
Co-Authors Dianawati, Erika Arum Husaini Nugroho, Febrianto Adi Sirait, Phichiato Susilowati Susilowati Wibawa, Aditya