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All Journal Reaktor Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan ELKHA : Jurnal Teknik Elektro Rekayasa Mesin Abdimas Umtas : Jurnal Pengabdian kepada Masyarakat Jurnal Teknologi Lingkungan Lahan Basah Makara Journal of Technology
Rakasiwi, Rinjani
Universitas Tanjungpura
Religion Agriculture, Biological Sciences & Forestry Arts Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences

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Rancang Bangun Pemanas Air Surya Tipe Datar Rakasiwi, Rinjani Ratih; Syaifurrahman, Syaifurrahman; Gani, Usman A
ELKHA : Jurnal Teknik Elektro Vol. 10 No. 2, October 2018
Publisher : Faculty of Engineering, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/elkha.v10i2.27901

Abstract

Kalimantan Barat dilalui Garis Khatulistiwa dimana surya menyinari selama 10-15 jam/hari. Energi surya diserap langsung oleh sistem pemanas surya. Energi panas yang dihasilkan dapat digunakan sebagai sumber panas dalam menghasilkan bahan bakar  terbarukan misalnya bioetanol dan biodiesel.  Implementasi untuk gagasan di atas dapat berupa teknologi pemanas surya yang sederhana, tanpa memerlukan energi listrik, biaya operasi murah dan ramah lingkungan.  Tujuan penelitian ini adalah merancang dan menguji pemanas air surya.  Pemanas surya dirancang bertipe datar dengan media pemanas berupa air. Pemanas surya terdiri dari kolektor panas dan tangki penampung air yang terbuat dari bahan stainlees steel dan polistiren sebagai isolator. Hasil rancang diperoleh pemanas air surya berkapasitas 50 liter yang diuji selama 3 hari dan mampu menghasilkan temperatur air maksimal sebesar 53oC pada intensitas cahaya rata-rata sebesar 1426 lux.
Pengaruh Penambahan Lumpur PDAM dan Zeolit sebagai Media Imobilisasi Bakteri terhadap Produksi Biogas dari Limbah Organik Pasar (Effect of Addition PDAM Sludge and Zeolite as Bacterial Immobilization Media on Biogas Production from Organic Waste) Wivina Diah Ivontianti; Rinjani Ratih Rakasiwi; Dwi Asniawati
Jurnal Teknologi Lingkungan Lahan Basah Vol 8, No 2 (2020): Juli 2020
Publisher : Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jtllb.v8i2.43189

Abstract

Abstract Organic waste can be processed into biogas through the anaerobic decomposition process. Anaerobic decomposition can be influenced by various factors including the addition of immobilization media. Cell immobilization is an attempt to increase the stability of the anaerobic process while reducing the potential for washout. Adding this solid material can increase reactor efficiency and can increase methane yield. The research on the addition of zeolite and PDAM sludge as immobilization media aims to find out how the effect of the addition of immobilized media, as well as the best composition between PDAM slurry and zeolite as immobilization media in the biogas production process from organic waste. The immobilization media used has three variations in the composition ratio between PDAM sludge and zeolites, namely 2:0, 2:1, 1:1 and a control reactor. Observation parameter are of VS, pH, concentration of methane gas and gas volume. Based on observations made, it was known that the addition of zeolite and sludge PDAM as a medium of immobilization in the biogas production process could increase biogas production and the concentration of methane produced. Of the three variations in the composition of the media used in this study, the composition ratio of 2: 1 gave the best biogas production results in the amount of 23.2844 L. As for the methane concentration, the overall reactor with the addition of immobilization media results in higher biogas concentrations and the reactor with the addition of media with a ratio of 2: 1 gave the largest methane concentration results. Keywords: biogas, immobilization, PDAM  Sludge, zeolite Abstrak Sampah organik pasar dapat diolah menjadi biogas melalui proses penguraian anaerobik. Penguraian anaerobik ini dapat dipengaruhi oleh berbagai faktor diantaranya penambahan media imobilisasi. Imobilisasi sel adalah salah satu usaha untuk meningkatkan stabilitas proses anaerob sekaligus mengurangi potensi washout. Penambahan material padatan ini dapat meningkatkan efisiensi reaktor dan dapat meningkatkan yield metana. Penelitian bertujuan untuk mengetahui bagaimana pengaruh penambahan media imobilisasi tersebut, serta komposisi terbaik antara lumpur limbah PDAM dan zeolit sebagai media imobilisasi pada proses produksi biogas dari limbah pasar. Media imobilisasi yang digunakan memiliki tiga variasi perbandingan komposisi antara lumpur PDAM dan zeolit, yaitu 2:0, 2:1,  1:1 dan  reaktor kontrol. Parameter pengamatan adalah  nilai VS, pH, konsentrasi gas metana, dan volume gas. Berdasarkan hasil pengamatan yang dilakukan diketahui bahwa penambahan zeolit dan lumpur PDAM sebagai media imobilisasi pada proses produksi biogas dapat meningkatkan produksi biogas serta konsentrasi metana yang dihasilkan. Dari tiga variasi perbandingan komposisi media yang digunakan dalam penelitian ini, perbandingan komposisi  2:1 memberikan hasil produksi biogas terbaik yaitu sebesar 23,2844 L. Sedangkan untuk konsentrasi metana, reaktor dengan penambahan media imobilisasi menghasilkan konsentrasi biogas yang  lebih tinggi dengan hasil terbaik yaitu variasi  perbandingan 2:1. Kata kunci: biogas, immobilisasi, lumpur PDAM, zeolit
Manufacture of Hand Sanitizer and Liquid Soap in Pinang Dalam and Pinang Luar Villages Eva Pramuni Oktaviani Sitanggang; Rinjani Ratih Rakasiwi; Wivina Diah Ivontianti; Lalak Tarbiyatun Nasyin Maleiva; Zainal Abidin
ABDIMAS: Jurnal Pengabdian Masyarakat Vol. 5 No. 2 (2022): ABDIMAS UMTAS: Jurnal Pengabdian Kepada Masyarakat
Publisher : LPPM Universitas Muhammadiyah Tasikmalaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (840.745 KB) | DOI: 10.35568/abdimas.v5i2.2521

Abstract

The COVID-19 pandemic has hit the whole world, including Indonesia. Many attempts had been deftly conducted by the Government as a countermeasure so that this virus does not spread further and the cases can decrease. However, among all the implemented efforts, liquid soap and hand sanitizer have not been produced. Therefore, the socialization for the production of liquid soap and hand sanitizers were carried out to the residents of Pinang Luar Village and Pinang Dalam Village, Kubu Raya Regency, West Kalimantan, as residents of remote villages who had difficulty accessing the health protocol necessaries. Through this project, the residents expectedly can have the skills to produce them independently and avoid the dangers of COVID-19. Keywords: COVID-19, hand sanitizer, liquid soap
KAJIAN EFISIENSI PANAS KOLEKTOR PEMANAS AIR SURYA PADA MOBILE MINI BIODIESEL PLANT Rinjani Rakasiwi; Syaifurrahman Syaifurrahman; Wivina Diah I; Usman A Gani
Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v13i3.1209

Abstract

Integration of solar water heating system and biodiesel unit process has resulted a prototype called Mini Biodiesel Plant. The key of that unit is the effectiveness of heat transfer that occured in the solar collector. The purpose of this research is to analyze the performance of the collector from the solar water heating system. The solar collector used is a flat plate type with a surface area of 0.7m2. It consists of a glass cover, alummunium absorber, styrofoam insulator and woof frame. Based on the research result for 5 times for 5 hours each day, the highest of intensity of solar radiation (I) was 859 W/m2 can produce  maximum hot water (Ta) of 62oC. The average of real heat has been absorbes by teh collector (Qu) was 271 Watt while the maximum of heat loss (Qloss) was 144.6 Watt therefore the average of collector efficiency (ƞ) was 45.1%.
Biogas Purification using Modified Red Mud Adsorbent with a Study of the Length of the Adsorbent Column Wivina Diah Ivontianti; Gayu Ika Putri; Rinjani Ratih Rakasiwi; Syahrul Khairi; Sri Rezeki; Aini Sulastri
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 21, No 1 (2024): March 2024
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v21i1.70-79

Abstract

This study used red mud as an adsorbent for biogas purification. However, red mud had to undergo dealumination and calcination processes before being used as an adsorbent. Several acids, including 1 M HCl and 1M H2SO4, were employed in the red mud dealumination process, which was then analysed by XRF and GSA instruments. The results show that the best type of acid for the dealumination process was HCl with a Si/Al ratio, total pore volume, surface area and pore radius of 1.697; 67,081 m2/g; 0.1624 cm3/g; 48.4242 Å. The biogas purification process was carried out using red mud adsorbent dealuminated with HCl by varying the length of the adsorbent column, such as 10, 20 and 30 cm, and the contact time of 5, 10, 15 and 20 min. The optimum column length variation was 30 cm. The results obtained for this variation were a decrease in CO2 content of 292742.30 ppm with an efficiency of 19.08%. The increase in CH4 was 378232.69 ppm with a percentage increase of 240.28%.
Coffee Shop Liquid Waste Treatment System Using Portable Waste Water Treatment Plant (WWTP) Ivontianti, Wivina Diah; Rakasiwi, Rinjani Ratih; Sintanggang, Eva Pramuni Oktaviani; Syaifurrahman, Syaifurrahman; Aulia, Penny
Jurnal Teknologi Lingkungan Lahan Basah Vol 12, No 1 (2024): Januari 2024
Publisher : Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jtllb.v12i1.72534

Abstract

Coffee shops produce waste that is included in the category of domestic waste in a fairly large amount. Therefore, it is necessary to carry out domestic wastewater management. One solution is the design of an integrated portable WWTP that can treat waste from coffee shop business activities. The advantages of using WWTP are that it is simple and does not require  large amounts of land. The processing of this WWTP consists of filtration and precipitation. The wastewater to be filtered will be separated from the solids, after which it will be continued with stratified filtration using activated carbon. In the study, variations in flow rate were carried out to determine processing efficiency, namely variations in tap openings of 30o, 45o, and 90owith water flow rate of 200, 360, and 570 mL/s.  The result of research, the portable Wastewater Treatment Plant with activated carbon filtration designed has been able to treat coffee shop liquid waste. The variation of flow rate in the processing of coffee shop liquid waste affects the processing results where the smaller the flow rate, the greater the efficiency reduction. The optimum flow rate variation in this study is 200 mL/s with a COD removal efficiency of 48.5%, TSS 72.8%, Coliform 66.6%, TDS 62.5%, and pH 6.2.  The suggestion that can be given is the addition of a biological treatment system to optimize the performance of Portable WWTP.
The Effect of Variation of Palm Fronds Absorbent Concentration In Adsorption Process to Reduce Free Fatty Acid Content on Tengkawang Oil Puspita, Filda Agum; Oktaviani, Eva Pramuni; Rakasiwi, Rinjani Ratih; Ivontianti, Wivina Diah
Reaktor Volume 23 No.3 December 2023
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.23.3.92-100

Abstract

Tengkawang oil that hasn’t through purification process contains free fatty acid that can affect its quality, where this essence is the polluter that must be removed because it can caused a rancid. The removal of free fatty acid content on Tengkawang oil was done through adsorption process utilizing palm fronds adsorbent by using its cellulose content. Palm fronds went through dilegnification process using 10% of NaOH, then adsorption process was conducted with adsorbent concentration variety 5, 10, 15, 20 and 25%. Adsorbent characterized by utilizing FTIR and SAA, from FTIR result shows that palm fronds contain berlignocellulose function cluster, after delignification the C=C lignin compound function cluster still can be found on FTIR result and after adsorption O-H cluster went through intensity decrement which shows that cellulose content and hydroxyl (-OH) cluster reacted with adsorbat. Furthermore, there’s absorption on C-H function cluster that indicates the existence of free fatty acid compound and other polluter that adsorbed by palm fronds adsorbent. The characteristic of palm fronds adsorbent after delignification process was conducted shows the pore size is on micropore range with surface area of 6.480 m2/g, pore volume of 0.01138 cc/g and pore radius of 12.4 Å. The result of the research shows decreasing percentage of free fatty acid, capacity value and adsorption effectiveness of Tengkawang oil that the highest is on adsorbent concentration as much as 25% with decreasing percentage of free fatty acid as much as 4.68%, adsorption capacity as much as 207.19 mg/g and adsorption effectiveness as much as 36.28%. Keywords: adsorption; delignification; free fatty acid; tengkawang oil
Effect of the CaO Catalyst Concentration Based on Barnacle Shells (Tetraclita squamosa) on Biodiesel Production from Coconut Oil Rakasiwi, Rinjani; Rezeki, Sri; Hafiza, Nurul; Ivontianti, Wivina Diah
Makara Journal of Technology Vol. 29, No. 1
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Barnacle shells are a source of the calcium oxide (CaO) catalyst, which is nontoxic, highly alkaline, and biodegradable. This study aims to determine the characteristics and the effect of the CaO catalyst concentration obtained from the calcination of barnacle shell particles at a temperature of 900 ℃ for 2 and 4 h on the transesterification reaction of biodiesel from coconut oil. Transesterification was conducted at 65℃ for 2 h with a methanol/coconut oil molar ratio of 6:1. The concentration of the CaO catalyst was varied (i.e., 1wt%, 3wt%, 5wt%, 7wt%, and 9wt%) for coconut oil. The results of the characterization of the catalyst through the X-ray diffraction test showed that the best calcination time was 4 h. The characteristic peaks of CaO appear at diffraction angles (2θ) of 31.4°, 36.0°, 54.3°, and 64.7°. The optimum catalyst concentration was 5wt%, where the highest yield (92.17%) was obtained with the following biodiesel characteristics: density at 40 ℃ of 863 kg/m3 , kinematic viscosity at 40 ℃ of 3.03 cSt, water content of 0.01%, and acid number of 0.26 mg KOH/g. The results of the gas chromatography–mass spectrometry analysis based on the optimum catalyst concentration showed that biodiesel was composed of methyl ester compounds, which were dominated by methyl laurate (54.52%) and methyl myristate (19.37%).
Co-Authors Aini Sulastri Aulia, Penny Dwi Asniawati Eva Pramuni Oktaviani Sitanggang Gayu Ika Putri Hafiza, Nurul Ivontianti, Wivina Lalak Tarbiyatun Nasyin Maleiva Oktaviani, Eva Pramuni Puspita, Filda Agum Sintanggang, Eva Pramuni Oktaviani Sitanggang, Eva Sri Rezeki Sri Rezeki Syahrul Khairi Syaifurrahman Syaifurrahman Usman A. Gani Wivina Diah I Wivina Diah Ivontianti Wivina Diah Ivontianti, Wivina Diah Zainal Abidin