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All Journal TELKOMNIKA (Telecommunication Computing Electronics and Control) Eksergi: Chemical Engineering Journal JISI UMJ (Jurnal Integrasi Sistem Industri UMJ) Journal of Engineering and Technological Sciences JURNAL NASIONAL TEKNIK ELEKTRO R.E.M (Rekyasa Energi Manufaktur) Jurnal Indonesian Journal of Chemistry REACTOR : Journal of Research On Chemistry And Engineering Journal of Applied Agricultural Science and Technology Journal of Industrial Community Empowerment JURNAL REKAYASA KIMIA & LINGKUNGAN
Reni Desmiarti
Bung Hatta University
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Behavior of Natural Estrogens in Activated Sludge: Biodegradation in Semicontinuous Reactor under Aerobic, Anaerobic and Sequential Anaerobic/Aerobic Conditions Reni Desmiarti; Fusheng Li
Journal of Engineering and Technological Sciences Vol. 45 No. 2 (2013)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2013.45.2.1

Abstract

The behavior of natural estrogens was examined by separately spiking 17β-estradiol (E2) and estrone (E1) into semicontinuous activated sludge reactors operated under aerobic, anaerobic and sequential anaerobic/aerobic conditions. Under aerobic and anaerobic conditions, E1 was formed from E2. The cactivated sludge; biodegradation; estrogens; estradiol; estroneonversion of E1 to E2 was did not occur under aerobic conditions. The maximum conversion of E2 to E1 was higher than the maximum conversion of E1 to E2. Overall, the degradation rate of E2 (kE2) was much faster than that of E1 (kE1). The findings suggest that E1 is probably more persistent than E2 in effluent of sewage treatment plants.
Preliminary Study on Treatment of Palm Oil Mill Effluent (POME) by Sand Filtration-DBD Plasma System Ariadi Hazmi; Reni Desmiarti; Eka Putra Waldi; Primas Emeraldi
Journal of Engineering and Technological Sciences Vol. 48 No. 1 (2016)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2016.48.1.3

Abstract

In the palm oil industry, open ponding, aerobic and anaerobic digestion, physicochemical treatment and membrane filtration are generally applied as conventional treatments of palm oil mill effluent (POME). In this study, a sand filtration-dielectric barrier discharge (DBD) system was investigated as an alternative process for treating POME. This system can reduce land usage, processing time and costs compared to conventional systems. The removal efficiency of chemical oxygen demand (COD), biological oxygen demand (BOD5), and oil-grease in relation to the applied voltage were studied. Furthermore, the pH and temperature profiles were investigated. The obtained results indicate that the removal efficiency of COD, BOD5, and oil-grease increased with an increase of the applied voltage. The electrical energy consumption needed is about 10.56 kWh/L of POME.
Characteristics of NOM Released to Water from Different Forest and Agricultural Soils Hongjie Gui; Fusheng Li; Yongfen Wei; Toshiro Yamada; Reni Desmiarti
Journal of Engineering and Technological Sciences Vol. 48 No. 5 (2016)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2016.48.5.9

Abstract

The characteristics of natural organic matter (NOM) released to water from a soil environment were investigated based on the release potential and the quality indexes of SUVA, fluorescence EEM and molecular weight distribution using eight forest and agricultural soils collected from a representative river catchment (Kani River catchment in Gifu, Japan). The content of organic matter (OM) and its release potential to water differed obviously with type of soil origin, in the following order: vegetable field (VF) < paddy field (PF) < broadleaf forest (BF) < coniferous forest (CF) and VF < PF < CF < BF, respectively. For the released NOM, SUVA under different pH conditions decreased in the following order: neutral condition [3.6-24.0 m-1/(mg/L)] > basic condition [3.5-8.0 m-1/(mg/L)] > acidic condition [2.5-3.0 m-1/(mg/L)]. Humic acids (P1), fulvic acids (P2) and protein-like substances (P3) were the main components of the NOM released under neutral condition. The proportion of P1 and P2 released from the forest soils was lower than that from the agricultural soils. Marked differences in UV-absorbing constituents of NOM between forest and agricultural soils were found in the peak with a molecular weight of about 9800 g/mol identified as PSS (polystyrene sulfonate).
Disinfection Performance against Salmonella Typhi in Water by Radio Frequency Inductive Couple Plasma System Reni Desmiarti; Ariadi Hazmi; Fusheng Li
Journal of Engineering and Technological Sciences Vol. 49 No. 6 (2017)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2017.49.6.3

Abstract

The disinfection performance of the radio frequency inductively coupled plasma (RFICP) system against Salmonella Typhi in water was examined using continuous flow experiments. The evaluation was based on disinfection efficiency, death rate constant, disinfection yield, and energy consumption. For all experiments the electromagnetic flux generated in the plasma reactor varied from 4 to 6 W/cm2. The disinfection efficiency and death rate constant of Salmonella Typhi decreased with the increase of the initial number of Salmonella Typhi bacteria. The disinfection yield increased from 784 to 1889 CFU/KWh and the energy consumption decreased from 0.28 to 0.07 KWh/L with the flowrate increasing from 5 to 20 mL/minute. The flowrate is an important parameter in predicting disinfection performance against pathogenic bacteria in water to design drinking water treatment plants.
Pembuatan Cairan Pembersih Lantai dengan Memanfaatkan Minyak Atsiri dan Hidrosolnya Erda Rahmilaila Desfitri; Reni Desmiarti; Sandy Yuda Verdana; Amelia Amanda
REACTOR: Journal of Research on Chemistry and Engineering Vol 3, No 1 (2022): Published in June 2022
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v3i1.56

Abstract

Floor cleaning products on the market usually use synthetic active that can interfere with health and the environment. Therefore, highly recommended to substitute synthetic active with natural active substances such as essential oils. The by-product of essential oils is hydrosol which is also not safe for the environment. This research aims to analyze hydrosol's effectiveness as an antibacterial and get an optimal formulation of oil essential and hydrosol as antibacterial in floor cleaning products. Kaffir lime leaf oil, lemongrass oil, and its hydrosol have been used as an additive in floor cleaners. pH value, free alkaline level, viscosities, and antibacterial effectiveness have been analyzed for floor cleaning products produced in this research. This research found a pH value of 6-8, viscosities is 1516-1867 cP, and free alkaline level of 0,1519-0,1627 b/b. The most antibacterial effectiveness found in the composition of kaffir lime leaf oil and its hydrosol is 15% and 30%, have bacteria inhibition of 10 mm. pH value, free alkaline, and viscosities have been fulfilled the standard of SNI 1842:2019.
The Effect of Calcination Temperature on The Quality of Quicklime from Different Limestone Mines in West Sumatera, Indonesia Reni Desmiarti; Ellyta Sari; Firdaus Firdaus; Erda Desfitri; Amelia Amir; Inva Salsabil; Maulana Rosadi; Nofri Naldi
Journal of Applied Agricultural Science and Technology Vol. 6 No. 1 (2022): Journal of Applied Agricultural Science and Technology
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (607.367 KB) | DOI: 10.55043/jaast.v6i1.44

Abstract

Quicklime is a widely used industrial chemical and its characteristics may be affected by the limestone characteristics and calcination temperature. The present study investigated the quicklime characteristics obtained from limestone after calcination at different temperatures (800, 900, and 1000 ℃) from six geological-different mines in West Sumatera, Indonesia. X-ray fluorescence (XRF) analysis was performed to characterize the elemental compositions in limestone and quicklime. The stoichiometric evaluation was examined to compare the obtained carbon dioxide (CO2) from experimental and theoretical results during calcination. Based on elemental composition from XRF analysis, all the investigated limestones are very pure limestones, with impurities of less than 1%. The level of calcium oxide (CaO) after calcination at 1000℃ increased to more than 90% for all investigated limestone. The obtained CaO and CO2 mass after calcination at 1000℃ for 5 h were more than 70 and 60 grams, respectively. However, the experimental results on CaO and CO2 mass were 5–12% less than theoretical mass, reflecting the partial decomposition of calcium carbonate during the calcination process.
Production of Cocoa Pulp Syrup by Utilizing Local Sugar Sources Firdaus Firdaus; Reni Desmiarti; Erti Praputri; Amelia Amir
Journal of Applied Agricultural Science and Technology Vol. 6 No. 2 (2022): Journal of Applied Agricultural Science and Technology
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (463.64 KB) | DOI: 10.55043/jaast.v6i2.70

Abstract

The pulp of the cocoa fruit still has not economically viable yet. Its potency to be processed into fruit syrup is expected to increase its value added. Local sugar from palm and canes is still traditionally utilized to produce brown sugar. This study aimed to make fruit syrup by utilizing cocoa pulp and local sugar sources in West Sumatra with several variants (palm sugar, sugarcane, and market white sugar). The effects of sugar concentration on the quality of the syrup were also studied. Sensory evaluation by the hedonic method was performed and statistical analysis data were carried out using SPSS. Microbiological analysis and shelf-life testing also have been done. The results of this study showed that respondents preferred syrup with palm sugar to sugarcane because of its light brown color and distinctive sweetness. The microbiological test reported that the syrup could only be consumed for less than the 5th day in a sealed glass bottle if it was placed at room temperature. Meanwhile, the syrup placed in the refrigerator (5 0C) could keep until the 5th day
Studi Efektivitas Pemanfaatan Arang Aktif Cangkang Kelapa Sawit (Elaeis guineensis) Sebagai Adsorben Pengurangan Kadar Amonia Limbah Cair Tahu Desfitri, Erda Rahmilaila; Arifanda, Aditya Yoga; Yulianti, Amro; Paysmi, Paysmi; Desmiarti, Reni
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.v21i1.10974

Abstract

Limbah cair tahu mengandung gas-gas yang terdekomposisi bahan-bahan organik yang terdapat di dalam air buangan seperti gas nitrogen (N2), oksigen (O2), hidrogen sulfida (H2S), ammonia (NH3), karbondioksida (CO2) dan metana (CH4). Penelitian sebelumnya menemukan bahwa kandungan ammonia pada limbah cair tahu berkisar antara 21,4 mg/L hingga 33,5 mg/L. Angka ini sangatlah tinggi jika dibandingkan dengan standar yang sudah ditetapkan oleh pemerintah yaitu sebesar 8 mg/L. Tujuan dari penelitian ini adalah untuk mengurangi pencemaran lingkungan yang disebabkan oleh ammonia yang berasal dari limbah cair tahu dan mengoptimalkan pemanfaatan limbah cangkang kelapa sawit. Pengurangan kadar ammonia ini dilakukan dengan metode adsorbsi, sedangkan metode analisis kadar ammonia menggunakan spektrofotometri. Arang aktif cangkang kelapa sawit diaktivasi menggunakan larutan H2SO4. Variasi waktu kontak yang digunakan adalah 30, 60, 90 dan 120 menit, sedangkan variasi massa adsorben adalah 2, 4, 6 dan 8gram. Hasil penelitian menunjukkan kondisi optimal untuk proses adsorpsi ammonia adalah 30 menit waktu kontak dengan 4gram jumlah arang aktif. Hasil karakterisasi menunjukkan bahwa arang aktif memenuhi standar kualitas dan cocok untuk mengurangi kadar ammonia dalam limbah cair tahu. Hasil penelitian ini dapat diaplikasikan untuk pemanfaatan limbah cangkang kelapa sawit untuk penurunan konsentrasi ammonia pada limbah cair tahu.
Penghilangan Kadar Klorine pada Precipitate Calcium Carbonate (PCC) dengan Proses Pencucian dan Filtrasi Naldi, Nofri; Arief, Syukri; Desmiarti, Reni; Sari, Ellyta; Desfitri, Erda Rahmilaila
Eksergi Vol 20, No 3 (2023)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v20i3.9684

Abstract

Kualitas Precipitated Calcium Carbonate yang dapat digunakan di industri kertas dan cat harus bebas dari klorin, karena dapat menyebabkan korosi pada peralatan. Hasil penelitian skala pilot plant kapasitas 2 kg/jam, produk PCC masih mengandung klorin (0,73 s/d 2,02 %), sedangkan standar industri <0,001%. Penelitian ini bertujuan untuk menghilangkan kadar klorin dengan metoda pencucian dan filtrasi tanpa vacuum dan metode kedua pencucian dan filtrasi dengan vacuum filter. Proses pencucian menggunakan air PDAM, air hujan dan aquadest dengan rasio PCC dengan air pencucinya yaitu 1:1, 1:2, 1:3 dan 1:4. PCC yang dihasilkan dari pilot plant dengan dua jenis PCC yaitu PCC dengan konsentrasi pelarut NH4Cl 12,5 g/L dan 50 g/L. Hasil penelitian menunjukkan penggunaan air PDAM dapat menurunkan kadar klorin 0,0322% (NH4Cl 12,5 g/L) dan 0,0959% (NH4Cl 50 g/L) dengan metoda pencucian dan filtrasi tanpa vakum dengan rasio 1:4. Kadar klorin yang diperoleh pada metode pencucian dan filtrasi dengan vacuum filter kadar klorin menjadi 0,0203% (pelarut NH4Cl 12,5 g/L) dan 0,0364% (pelarut NH4Cl 50 g/L). Morfologi PCC dipengaruhi konsentrasi NH4Cl. Kristal kalsit untuk konsentrasi NH4Cl (12,5 g/L) dan kristal aragonit untuk konsentrasi NH4Cl 50 g/L. Ukuran partikel yang diperoleh PCC 0 - 16 µm.
DESAIN ALAT BANTU PROSES PEMOTONGAN TAHU GUNA MENINGKATKAN PRODUKTIVITAS PRODUKSI bidiawati, ayu; Muchtiar, Yesmizarti; Setiawati, Lestari; Suherman, Hendra; Desmiarti, Reni
JISI: Jurnal Integrasi Sistem Industri Vol 11, No 2 (2024): JISI UMJ
Publisher : Fakultas teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jisi.11.2.261-270

Abstract

A company in the food industry that produces tofu has encountered issues with product size inconsistency in each batch. This is due to the very basic cutting process currently using only a knife and a wooden roller. As a result, errors can occur during production, leading to tofu pieces that are not uniform in size. To address this, a design for a cutting aid has been developed to increase the number of cut pieces and minimize the cutting process time. This cutting aid was designed using a rational method. The tofu cutting aid is ergonomically designed to make it easier for workers to perform their tasks. The goal of this tool is to produce tofu pieces that are uniform and of the same shape.
Co-Authors . Darwison Amelia Amanda Amelia Amir Ansyah, Zulfebri Ariadi Hazmi Arifanda, Aditya Yoga Ayu Bidiawati JR Desfitri, Erda Rahmilaila Edwardo Edwardo Eka Putra Waldi Elizarni Elizarni, Elizarni Ellyta Sari Ellyta Sari Erda Desfitri Erda Rahmilaila Desfitri Erti Praputri Firdaus Firdaus Fu-Sheng Li Fu-Sheng Li Fusheng Li Fusheng Li Fusheng Li Fusheng Li Gui, Hongjie Hapsauqi, Iqbal Hongjie Gui Inva Salsabil Lestari Setiawati Li, Fusheng Li, Fusheng mardian Matlal Fajri Alif Maulana Rosadi Muhammad Imran Hamid Mustikaningtias, Endah Naldi, Nofri Nofri Naldi Nora Idiawati Paysmi, Paysmi Permata, Adinda Ratu Primas Emeraldi Putra, Ikhsan Syafano Raihan, Mohammad Ramayani, Devi Rambe, Rodo Padena Rizaldi, Fajri Akbar Rosadi, Maulana Yusup Sandy Yuda Verdana Suherman, Hendra Susanti, Riju Syukri Arief Tanjung, Diva Amanda Toshiro Yamada Wahyuni, Alfia Wei, Yongfen Yamada, Toshiro Yesmizarti Muchtiar Yongfen Wei Yulastri . Yulianti, Amro Zulhadjri Zulhadjri