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All Journal Eksergi: Chemical Engineering Journal Bulletin of Chemical Reaction Engineering & Catalysis IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Jurnal Distilasi Jurnal Redoks Martabe : Jurnal Pengabdian Kepada Masyarakat WIDYA LAKSANA Jurnal Inovator Barometer Jurnal Teknik Kimia JURNAL SURYA ENERGY Best Journal (Biology Education, Sains and Technology) Jurnal Abdi Insani JURNAL TEKNIK PATRA AKADEMIKA AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Aptekmas : Jurnal Pengabdian Kepada Masyarakat Jurnal Teknik Kimia dan Lingkungan PROSIDING SEMINAR NASIONAL PENELITIAN DAN PENGABDIAN KEPADA MASYARAKAT (SNPPM) UNIVERSITAS MUHAMMADIYAH METRO Bulletin of Chemical Reaction Engineering & Catalysis
Mardwita, Mardwita
Chemical Engineering Department, Faculty Of Engineering, Universitas Muhammadiyah Palembang, Palembang., Indonesia
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Analisa Efesiensi Bahan Bakar Dan Dampak Lingkungan Emisi Gas Buang Pembangkit Listrik Tenaga Diesel (Pltd) Terhadap Pembangkit Listrik Mesin Gas (PLTMG) marhaini, marhaini; Mardwita, Mardwita; Suranda, Arief
JURNAL SURYA ENERGY Vol 6, No 2 (2022)
Publisher : UNIVERSITAS MUHAMMADIYAH PALEMBANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32502/jse.v6i2.4215

Abstract

The need for electrical energy is a primary human need at this time, the need for electricity is almost a necessity for both industry, offices, and the general public. The main problem of the power generation industry today is the use of oil as fuel for power generation which will increase the cost of electricity production. One of the government's efforts to reduce the use of fuel oil is to use oil fuel with the consideration that natural gas is more effective and efficient, its use is more practical and its emissions are more environmentally friendly when compared to solar power. From these problems arose the idea of calculating the efficiency between a diesel-fired power plant (PLTD) and a gas engine power plant (PLTMG) powered by LNG (Liquedfied Natural Gas) and the resulting emission measurement results. The study conducted an efficiency analysis by carrying out a 50% and 75% load test of installed capacity and analyzing its environmental friendliness by taking the emission test results.
Effects of Calcination Temperatures on The Catalytic Activities of Alumina Supported Cobalt and Chromium Catalysts Mardwita Mardwita; Eka Sri Yusmartini; Nidya Wisudawati
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 3 Year 2019 (December 2019)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.14.3.4673.654-659

Abstract

Catalysts properties are important for catalytic reactions. The interaction between support and metal in a catalyst is resulted from catalyst preparation. In this study, gamma-alumina (Al2O3) supported cobalt (Co) and chromium (Cr) catalysts were prepared by impregnation method and calcined at two different temperatures, they are 400 °C for 4 hours and 800 °C for 4 hours. The resulted catalysts contained 10 wt.% of metal and denoted as Co/Al2O3(400), Co/Al2O33(800), Cr/Al2O3(400), and Cr/Al2O3(800) catalysts. The surface and state of the catalysts were examined by using x-ray diffraction (XRD), x-ray photoelectron spectrometer (XPS) and transmission electron microscopy (TEM). The XRD result reveals that strong interaction between Co and Al2O3 due to a formation of higher cobalt oxide. The XRD result further indicates aggregation and strong support metal interaction between Co and Al2O3 during calcination. On the other hand, TEM result showed that large Co particle was observed on Al2O3. The Cr/Al2O3 catalysts were characterized by using XPS. The XPS results showed that Cr/Al2O3(800) catalyst was dominated by Cr6+ species at binding energy 579.04 eV, indicating high dispersion of Cr on Al2O3. Moreover, Cr metal particle was not observed on XRD and TEM image. All the characterization results provide information that the impregnated metal on Al2O3 showed different properties. Co metal particle tends to be more oxidized and formed large particle, however it was not observed on Cr metal particle. 
Effects of Cobalt and Chromium Loadings to The Catalytic Activities of Supported Metal Catalysts in Methane Oxidation Mardwita Mardwita; Eka Sri Yusmartini; Nidya Wisudawati
Bulletin of Chemical Reaction Engineering & Catalysis 2020: BCREC Volume 15 Issue 1 Year 2020 (April 2020)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.15.1.6320.213-220

Abstract

A series of alumina supported cobalt and chromium catalysts with different metal loadings were prepared by impregnation method. Six types of alumina supported cobalt and chromium catalysts contained 5 wt%, 10 wt%, and 15 wt% loadings were produced and tested in methane oxidation. The catalysts were characterized by using x-ray diffraction (XRD) and carbon monoxide chemisorption (CO chemisorption). The XRD results do not confirmed any features of cobalt and chromium metal. The metal sizes for both catalysts were larger in high loading as shown by CO chemisorption results. Methane conversion results showed that the conversion increases with increasing the metal loading, however supported chromium catalysts were higher in activities compared to supported cobalt catalysts. Thermal stability tests on 15 wt% Co/Al and 15 wt% Cr/Al catalyst showed that supported chromium catalyst is more stable and maintain the particle size due to its strong interaction with support, while supported cobalt catalyst decrease in methane conversion due to deactivation of the catalyst. Copyright © 2020 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Egg Shells as an Adsorbent for the Adsorption of Lead (Pb) and Iron (Fe) Metals Eka Sri Yusmartini Yusmartini; Mardwita Mardwita; Atikah Atikah; Suli Cahaya Kaswari
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 8 No. 1 (2024)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29165/ajarcde.v8i1.349

Abstract

An eggshell is estimated to have around 10,000–20,000 pores; this condition created a chance for the eggshells to be used as an adsorbent. This research aims to activate egg shells used as an adsorbent. Egg shells were applied as an adsorbent in solutions of lead (Pb) and iron (Fe). Test parameters for adsorption capacity were carried out on the optimum mass and absorption contact time with lead (Pb) and iron (Fe) while using the eggshell waste as an adsorbent. The adsorbent quality of egg shells was tested using parameters such as ash content, water content, and adsorption capacity towards methyl blue. This research aims to utilize egg shells as an adsorbent to absorb lead (Pb) and iron (Fe) content using an adsorption process. There are 3 stages of a method for this research to establish: adsorbent preparation, adsorbent activation, and the adsorption process. The adsorption process was carried out with variations of the mass sample, which are 0.75 grams, 1 gram, 1.25 grams, 1.50 grams, and 2 grams and time variations when contact occurred in 20, 30, 40, 50, and 60 minutes. The outcome of this research showed that the highest adsorption capacity at the optimum mass of Pb metal was 1.5 grams at 98.914% and for Fe metal at 96.386%. The highest adsorption capacity results were influenced by Pb metal contact time in 40 minutes, which was 99.30%, and the best capacity for adsorption of Fe metal was at a contact time in 50 minutes, which was 99.82%.
Efisiensi Thermal Alat Economizer pada Pre-Treatment Section dalam Pengolahan Crude Palm Oil (CPO) Ariyanto, Eko; Alqorni, Muhammad Faris; Mardwita, Mardwita
Eksergi Vol 21, No 1 (2024)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v21i1.9974

Abstract

Dalam industri pengolahan CPO, efisiensi energi pada alat economizer menjadi faktor penting dalam meningkatkan efektivitas produksi. Penelitian ini bertujuan untuk mengevaluasi kinerja alat economizer dalam mentransfer energi panas pada aliran fluida Crude Palm Oil (CPO) dan Refined Bleached and Deodorized Palm Oil (RBDPO). Metode penelitian yang dilakukan adalah pengamatan langsung dengan pengukuran suhu dan aliran fluida, dari data tersebut dihitung heat loss dan evaluasi efisiensi termal pada PT XYZ. Hasil penelitian menunjukkan terjadi fluktuasi temperatur pada aliran masuk dan keluar CPO dan RBDPO. Fluktuasi ini dipengaruhi oleh perubahan variabel aliran fluida yang masuk. Aliran massa RBDPO mengalami peningkatan dari 33.659,98 kg/jam menjadi 36.720 kg/jam, sementara aliran CPO tertinggi pada 37.280 kg/jam. Efisiensi termal alat economizer HE-T521A dengan nilai rata-rata sebesar 89,45%. Efisiensi termal tertinggi dicapai pada tanggal 22 Februari 2023, yaitu mencapai 91,09%, sedangkan nilai terendah terjadi pada tanggal 24 Februari 2023, sebesar 88,58%. Meskipun efisiensi termal masih di bawah target desain 94%, alat ini tetap memberikan efisiensi termal yang relatif baik. Hasil penelitian ini dapat digunakan sebagai dasar untuk perbaikan dan pemantauan lebih lanjut guna meningkatkan efisiensi termal alat sesuai dengan desain yang diharapkan.
PENYULUHAN PEMBUATAN KOMPOS DARI LIMBAH RUMAH TANGGA MENGGUNAKAN KOMPOSTER DI KELURAHAN KEBUN BUNGA PALEMBANG Mardwita, Mardwita; Yusmartini, Eka Sri; Kalsum, Ummi; Rifdah, Rifdah; Angkasa, Zuber
JURNAL WIDYA LAKSANA Vol 7 No 2 (2018)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jwl.v7i2.12897

Abstract

Meningkatnya jumlah sampah dilingkungan masyarakat memberikan dampak negatif bagi kesehatan masyarakat, seperti masalah kesehatan dan polusi udara (bau) yang dihasilkan oleh sampah. Sampah organik seperti sayur-sayuran dan buah-buahan yang telah membusuk dan banyak dihasilkan dari rumah tangga dapat diolah menjadi pupuk kompos. Tujuan dari pengabdian masyarakat ini adalah untuk mengajarkan pada masyarakat khususnya ibu rumah tangga untuk dapat memisahkan antara sampah organik dan anorganik dan selanjutnya dapat mengolah sampah organik tersebut menjadi pupuk kompos. Pengomposan sampah organik tersebut menggunakan komposter dan Effective Microorganism 4 (EM4). Hasil pengomposan berupa pupuk kompos padat dan cairan lindi. Cairan lindi dapat digunakan kembali sebagai biang dan dapat digunakan sebagai pupuk cair tanaman. 
Pendampingan dan Pelatihan Web Pemasaran Berbasis On-Line Di SMA Negeri I Tanjung Raja Yusmartini, Eka Sri; Mardwita; Aseptianova
JURNAL WIDYA LAKSANA Vol 11 No 2 (2022)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (512.012 KB) | DOI: 10.23887/jwl.v11i2.40041

Abstract

Menumbuhkan minat dan jiwa entrepreneur dapat ditanam sejak di bangku sekolah. Dengan mendaur ulang sampah organik yang dihasilkan oleh sekolah menjadi pupuk kompos dan menjualnya menjadi salah satu upaya melahirkan entrepreneur muda. Tim Pengabdian UM Palembang bermitra dengan SMA Negeri 1 Tanjung Ogan Ilir dalam memberikan keterampilan dasar menjadi entrepreneur, tidak hanya kepada siswa tetapi juga guru pendamping, yaitu keterampilan dalam membuat website sebagai sarana promosi dan penjualan serta keterampilan mendesain label produk agar mampu menarik perhatian pembeli. Metode pelaksanaan kegiatan pengabdian ini adalah pra-pelaksanaan, pelaksanaan dan evaluasi. Hasil dari kegiatan ini adalah peningkatnya pengetahuan siswa dan guru pendamping terhadap pembuatan website untuk memasarkan produk, pelabelan produk serta adanya website SMANTRA01 dengan menggunakan platform Google Site dan label produk SMANTRA 01 Kompos sebagai hasil pendampingan.
Co-Authors Agustina . Alqorni, Muhammad Faris Ary Rahmady Pratama Ary Rahmady Pratama Aseptianova Aseptianova Aseptianova Aseptianova Aseptianova Atikah Atikah Azzahra Aprilia Rosa Eka Sri Yusmartini Eko Ariyanto Eko Ariyanto Eko Ariyanto Eko Ariyanto Elfidiah, Elfidiah Erna Yuliwati Erna Yuliwati Erna Yuliwati Fernianti, Dewi Galih Abriansyah Husnul Khotimah Innike Abdillah Fahmi Junanda Marza Kgs. A Roni Lolita Safitri Marhaini, Marhaini Meylinda Rahayu Muhammad Djoni Bustan Muhammad Djoni Bustan Netty Herawaty Nidya Wisudawati Nindia Selviana Parwanti, Sri Rahadianto Wahyu Triaji Rifdah, Rifdah Rifdah, Rifdah Sri Haryati Sri Haryati Suli Cahaya Kaswari Sulton Nawawi Suranda, Arief Suryati, Linda Ummi Kalsum Yoga Yuniadi Zuber Angkasa