Article Per Year (5 Year)
p-Index From 2021 - 2026
3.533
P-Index
This Author published in this journals
All Journal Jurnal Teknik Kimia USU Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Journal of Engineering and Technological Sciences Konversi Jurnal UNITEK Narra J Journal of Bioprocess Chemical and Environmental Engineering Science Jurnal Teknik Kimia USU Jurnal Pengabdian Masyarakat Bidang Sains dan Teknologi Jurnal Offshore: Oil, Production Facilities, and Renewable Energy Heca Journal of Applied Sciences Malacca Pharmaceutics Leuser Journal of Environmental Studies Infolitika Journal of Data Science JURNAL REKAYASA KIMIA & LINGKUNGAN
Zuchra Helwani, Zuchra
Unknown Affiliation
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Public Health Transportation Veterinary Other

Published : 71 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 71 Documents
Search

 1   2   3   4   5 
Bahan Bakar Padat Dari Tandan Kosong Sawit Menggunakan Proses Torefaksi Dengan Variasi Suhu Dan Waktu Torefaksi Zen, Muhammad; Helwani, Zuchra; Komalasari, Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

Empty fruit bunches (EFB) can be used as alternative energy source by using torrefaction process. Torrefaction is a pre-treatment process of biomass into solid fuel within temperature range of 200-300oC in an inert condition. The Torrefaction process research aims to produce solid fuel from EFB and study the effect of process variabel towards characteristic of solid fuel resulted. Torrefaction of empty fruit bunch was using fixed bed horizontal reactor with temperature (250-300oC) and torrefaction time (15-45 minute). Product quality resulted was calorific value, mass yield, energy yield and proximate (moisture content, ash content, volatile content and fixed carbon). The result obtained for calorific value in range was 19883.03-23165.96 kJ/kg, mass yield was 47.93-71.64 %, and energy yield was 65.09-86.39 %. 17091.03-20697.13 kJ/kg, mass yield was 35.95-59.91 %, and energy yield was 50.97-72.91 %. Proximate analysis resulted in the form of moisture content was 0.40-0.73 %, ash content was 8.75-10.16 %, volatile content was 35.94-64.48 %, and fixed carbon was 26.78-53.90 %. From the result obtained, the effect of rising temperature and torrefaction time give linier effects toward the product quality. Increased temperature and torrefaction time give enhancement to the calorific value, ash content, and fixed carbon.Keywords: biomass, empty fruit bunches, solid fuel, torrefaction.
Pengaruh Kondisi Proses Terhadap Karakteristik Pulp Pada Fraksinasi Rumput Gajah Menggunakan Asam Formiat Dizikri, Dizikri; Helwani, Zuchra; Rionaldo, Hari; Zulfansyah, Zulfansyah
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

Elephant grass is a lignocellulosic biomass which has not been utilized optimally. Fractination of elephant grass can be converted into valuable products, such as pulp. The objectives on this research is to study the effect of the process condition on pulp yield, cellulose and lignin content in pulp. The effect of process condition were studied by Response Surface Methodology (RSM) using Central Composite Design (CCD). Fractionation of elephant grass performed on a normal boiling point of the solution with a concentration of formic acid (60%, 70% and 80%), the reaction time of 60-180 minutes, solid to liquid ratio of 10/1 to 20/1, 40 grams elephant grass, HCl catalyst 0.1% wt. This research has 4 stages process that are cooking, screening, washing and drying. The pulp from process will be analyzed for yield pulp, alpha celluose content and lignin content. The result shows that fractionation of elephant grass have yield pulp of 53.6% to 73.7%, cellulose pulp of 84.03% to 93.97% and lignin pulp of 11% to 19.5%. the concentration of formic acid and reaction time influence each response significantly.Keywords: biomass fractionantion, central composite design, elephant grass, response surface methodology.
Pembuatan Katalis Heterogen Naoh/Cao/C Dari Kulit Telur Ayam Untuk Produksi Biodiesel Dari Minyak Sawit Off Grade Hawa, Karfika Ainil; Helwani, Zuchra; Amri, Amun
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

Eggshell waste was modified by calcination, hydration and dehydration methods. Which were impregnated with activated carbon and NaOH made to be used as heterogeneous base catalysts used off grade palm oil transesterification reactions.The catalyst with the highest activity on production of biodiesel is obtained in the catalyst prepared by calcination temperature of 800 °C and catalyst ratio mass of 7:3 with transesterification reaction conditions of a molar ratio of methanol/oil 6:1, catalyst dosage of 6% by weight, temperature of 70 °C for 3 hours having yield biodiesel results reached 79,08%.Keyword: activated carbon, biodiesel, calcium oxide, catalysts, transesterification.
Pembuatan Pulp Dari Rumput Gajah Dengan Pelarut Organik Asam Formiat Syahputra, Dede; Helwani, Zuchra; Rionaldo, Hari; Zulfansyah, Zulfansyah
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

Elephant grass is lignocellulosic material that has the potential as raw material in pulping process. The objective of this research is to study effect of operational condition on the characteristic of pulp. Effect of the process condition were studied by Response Surface Methodology (RSM) with Central Composite Design (CCD). Pulping Experiment were carried out at the boiling temperature of cooking liquorat atmosphere ic pressure with 40 gram of elephent grass with a concentration of formic acid were 60%, 70%, and 80%, cooking time were 60 minutes, 120 minutes, and 180 minutes, solid to liquor ratio were 10/1, 15/1, and 20/1, and catalyst HCl was 0,1%. The result showed that pulp of the elephant grass have yield pulp of 53,6% - 73,7%, lignin content of 11% - 19,5%, and tensile index of 47,93 – 205,491 Nm/g.   Keywords:  organosolv pulping, formic acid, elephant grass, CCD, RSM.
Optimasi Kondisi Proses Pembuatan Pulp Tandan Kosong Sawit Rafi, M Khaidiz; Helwani, Zuchra; Rionaldo, Hari; Zulfansyah, Zulfansyah
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

The use of wood for paper making in Indonesia can be reduced by biomass materials and non-wood raw materials. Indonesia is the country that produces the largest palm oil in the world with a total oil palm plantation area of 11 million Ha and a total palm oil production of 33 million tons / year [Ministry of Agriculture, 2016]. Reduce palm oil mill waste can be use by utilizing oil palm empty fruit bunch as alternative raw material in making paper. A central composite design (CCD) and response surface methodology (RSM) were employed to optimize the soda pulping of oil palm empty fruit bunch. The effects of three independent variables are temperature (120oC, 130oC and 140oC), cooking time (60, 120 and 180 min), solid to liquor ratio (1/8, 1/10 and 1/12) on pulp yield, lignin content, and physical properties of pulp were investigated. The major parameter influencing was the solid to liquor ratio for pulp yield and lignin content. According to the response surface analysis the optimum conditions for yiled pulp 50,66% and lignin content of 5,2% would be obtained using a cooking time of 60 minute, at 180◦C and with a solid to solid to liquor ratio of 1/12 with desirability value 0.788. On the physical characteristics of the pulp the value obtained for the burst index is 21.769 kPa m2/g, tensile index 0.570875 mN.m2/g and tear index 548.791 mN/g.Keywords: oil palm empty fruit bunch, optimization, CCD, RSM.
PROSES DENSIFIKASI PRODUK KARBONISASI TANDAN KOSONG SAWIT MENJADI BRIKET MENGGUNAKAN CRUDE GLISEROL PRODUK SAMPING BIODIESEL SEBAGAI FILLER Arifin, Lukman; Helwani, Zuchra; Fatra, Warman
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

Empty fruit bunches (EFB) has not been utilized optimally. EFB can be used as source of solid fuel in the form of briquettes. The calorific value of the EFB is 18.200,975 kJ / kg. The calorific value can be increased by carbonization process that is followed by densification process. Carbonization process aims to minimize the elements forming of the smoke, so the exhaust gas can be cleaner. Densification Process aims to increase the density and simplify the handling process. The calorific value of the combustion products can be enhanced by adding the filler. Crude glycerol is used as the filler, because it has a the calorific value of 25.175,98 kJ / kg which aims to improve the calorific value. The purpose of this research is to utilize EFB and wasting crude glycerol as a source of solid fuel, to learn how is the effect of crude glycerol, particle size, and compression pressure, to determine the influence of calorific value and compressive strength of the briquettes produced. EFB Densification uses a hydraulic press in operating conditions of particle sizes (60, 80, and 100 mesh), the composition of the filler (60:40, 70:30 and 80:20) and a pressing pressure (100.110, and 120 bar). Responses were analyzed, namely the calorific value and compressive strength by using Response Surface Methodology. The Best calorific value is obtained by 28.999,4 kJ / kg at 80 mesh particle size, composition filler 53: 47, and the pressing pressure of 110 bar. While the best compressive strength value is 9,5316 kg / cm2 at 100 mesh particle size, composition filler 60: 40, and the pressing pressure of 120 bar. Process conditions is very influence significantly on the calorific value and compressive strength is the composition of the filler and the pressing pressure.Keywords: Briquettes, Densification, Carbonization, Compressive Strength, Calorific Value, Empty Palm Bunches
Sintesis Hidroksiapatit Melalui Precipitated Calcium Carbonate (PCC) Cangkang Telur Ayam Ras Dengan Metode Presipitasi Pada Variasi Konsentrasi Pelarut HNO3 Dan Rasio CA/P Qalbi, Tiffani; Azis, Yelmida; Helwani, Zuchra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

Everyday, several thousand tons of eggshell are being generated as bio-waste in Indonesia. The eggshell is conteined 94% calcium carbonate (CaCO3) which can be used as raw material to synthesis hydroxyapatite (HAp). HAp is a bioactive ceramic material with high bioafinity and can be used as bone and dental implant. In this study, HAp was synthesized by precipitation method, using precipitated calcium carbonate (PCC) from chicken eggshell that has 99% purity. PCC as a calcium source was reacted with diamonium hydrogen phosphate ((NH4)2HPO4) as phosphorus source under concentration of HNO3 solvent (0,3; 0,4; 0,5 M) and Ca and P ratio varied from reactant (1,57; 1,67; 1,77) . The analysis using FTIR showed that the adsorption of PO43- and OH- ion in each sample indicated that the calcium phosphate compound has been formed. The sharpest peaks obtained on sample at the concentration of 0,4 M HNO3 solvent with ratio of Ca/P 1,57; a concentration of 0,4 M HNO3 solvent with ratio of Ca/P 1,67 and a concentration of 0,5 M HNO3 solvent with ratio of Ca/P 1,77. Based on XRD analysis, the best HAp obtained in concentration of 0,5 M HNO3 solvent and ratio of Ca/P 1,77 with crystal size 40.38 nm and crystal structure was hexagonal. The analysis by SEM-EDX showed that the morphology of HAp was agglomerates with single particles tends spherical and ratio of Ca/P was 1,5. The surface area of HAp obtained from the BET analysis was 3,606 m2/g and the yield was 58,89%.Keywords : Hydroxyapatite, precipitation method, PCC chicken egg shell, ratio Ca/P
Pembuatan Briket Dari Batang Sawit Menggunakan Gliserol Produk Samping Biodiesel Sebagai Matrix Aswie, Viqha; Helwani, Zuchra; Fatra, Warman
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

Palm oil waste is one of the potential biomass to be converted into briquettes. The size of the particles, the composition of the matrix crude glycerol on palm oil charcoal and the pressing pressure has an effect on the quality of the briquettes produced. This study aims to determine the effect of particle size, composition of matrix crude glycerol on palm oil, and pressing pressure in briquettes produced from palm oil, and analyze the effect of these variables using the analysis of Respond Surface Methodology (RSM). The palm stem is first carried out by a carbonization process to form palm oil charcoal. Palm oil charcoal is separated by 60, 80, and 100 mesh sieve and mixed with crude glycerol with the composition of charcoal to crude glycerol 60:40, 70:30, and 80:20. The samples that have been mixed are then densified at 100, 110 and 120 kg / cm2. The design of the experiment trip was determined by Central Composite Design in Design Expert 7.0.0 software. The resulting briquette products were analyzed in the form of heat value analysis, compressive strength analysis, and proximate analysis. The results showed that the highest calorific value was obtained at 28,089.6 kJ / kg in 80 mesh particle size, 53:47 charcoal matrix composition, and pressing pressure 110 bar. While the highest compressive strength value was 7,526 kg / cm2 at 10 mesh particle size, matrix composition of 80:20 charcoal, and pressing pressure 120 bar. Palm oil briquettes have met the standard heat value of briquettes (min. 21,000 kJ / kg) based on SNI.Keywords : briquettes, crude glycerol, matrix, palm prees
Karbonisasi Pelepah Sawit Dengan Variasi Temperatur Dan Waktu Karbonisasi Sitorus, Mesakh Fridolin; Komalasari, Komalasari; Helwani, Zuchra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

Palm fronds only used as a source of raw materials for animal feed, compost and organic fertilizer in the garden area so far. The heating value of palm fronds is 15,184 MJ/kg. The heating value can be improved by conducting carbonization process. Carbonization is a method to process biomass into solid fuel without oxygen where the temperature range is between 400-600 °C.The aim of this study is to produce a solid fuel from palm fronds by using carbonization process and studied the effect of variations in temperature (450-550 °C) and carbonization time (3-4 hours) on the quality of fuels from waste palm frond.Carbonization temperature used were 450, 500, 550oC, carbonization time used were 3, 3.5, 4hours. Particle size used were < 850 μm (20 mesh).The highest result of heating value was 27,177MJ/kg at 450oC for 3.5hours. The lowest result of volatile matter content was 7,01 %-wt at 550oC for 3hours. Significant process condition affecting the heating value was temperature and carbonization time.Keywords : Carbonization, Heating Value, Palm Frond, Volatile Matter
Optimasi Proses Karbonisasi Tandan Kosong Sawit Menggunakan Response Surface Methodology Putra, Bayu Eldino; Helwani, Zuchra; Fatra, Warman
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

Empty fruit bunches (EFB) is a source of biomass which has not been utilized optimally yet. EFB can be used as source of solid fuel in the form of charcoal because of its high calorific value 18,200.75 kJ / kg. The calorific value can be increased by carbonization. Carbonization is a process to convert lignoselulose biomass into charcoal within temperature range 300 – 600 °C in a limited oxygen environment. The purpose of this research is to utilize EFB as a source of solid fuel, to study the effect of process condition such as temperature, holding time, and feed size towards the characteristics of resulted charcoal and to optimize carbonization process from the data obtained. Reactor used for EFB carbonization is a tube furnace at operating conditions of temperature (350, 400 and 450 °C), holding time (90, 120 and 150 minutes) and feed size (2, 4 and 6 cm). Responses were analyzed, namely the calorific value and volatile matter by using Response Surface Methodology (RSM). Optimum conditions obtained are temperature 450 °C, holding time 90 minutes and feed size 6 cm with calorific value 28,106 kJ/kg and volatile matter 13.47 %. The most influential process variable for calorific value is temperature. Meanwhile for volatile matter, every process variables give significant effect.Keywords : Carbonization, Calorific Value, Empty Fruit Bunch, Optimization, RSM
Co-Authors Abd , Ammar Ali Abd Rahman, Sunarti Afriyenti, Mia Agustiyanti, Rini Dwi Agustiyanti, Rini Dwi Ahmad Fadli Ahmad, Khairunnas Akbar, Irfan Sarhadi Amir Awaluddin Amun Amri Anggraini, Diva Putri Anggriani, Rara Dewi Anjani, Putri Anuar, Kaspul Asep Rusyana Aswie, Viqha Bahruddin Bahruddin Bahruddin Boy M. Bachtiar Damayanti, Elok David Andrio Dhani Nur Miftahudin Dizikri, Dizikri Drastinawati Drastinawati Drastinawati Drastinawati, Drastinawati Dwi Septiana Edi Susanto Edy Saputra Eko Suhartono Emran, Talha Bin Febrina Dwi Putri Febrina Dwi Putri, Febrina Dwi Febrina, Wetri Fernando, Rivo Ghazi Mauer Idroes Hafiz, Fadlillahi Hanafi, Muhammad Rifter Hari Rionaldo Hari Rionaldo Hawa, Karfika Ainil Hawa, Karfika Ainil Hutagaol, Martiandes Ida Zahrina Idral Amri Idroes, Ghazi M. Idroes, Ghifari Maulana Jecky Asmura Julhijah, Noni Karfika Ainil Hawa Karina Octaria Putri Kemala, Pati Kesni Savitri Khairan Khairan Komalasari Komalasari Komang, Hendri Kusumo, Fitranto Lala, Andi Lubis, Vanizra F. Lukman Arifin Maulana, Aga Maulydia, Nur B. Miftahudin, Dhani Nur Miftahudin, Dhani Nur Muhammad Mardhiansyah Muhammad Zen, Muhammad Muliadi Ramli Mulya, Dynna Ardilla Putri Muslim Abdurrahman, Muslim Nasution, Muhammad Hatta Nazaris, Nazsha Nayyazsha Neonufa, Godlief Frederick Ningsih, Diana S. Noviandy, Teuku R. Nurfatihayati Nurwijayanti Oktariandi, Vito Oktriyono, Febri Dwi Olsy, Fradilla Othman, Mohd. Roslee Peliciamanuela, Samantha Perdana, Rendy Putra Prasetyo Arva S, Prasetyo Arva Pratama, Teddy Pratama, Yudistira Putra Zelly Nugraha, Putra Zelly Putra, Bayu Eldino Putra, Yogi Lesmana Putri, Karina Octaria Putri, Karina Octaria Qalbi, Tiffani Rafi, M Khaidiz Rahayu, Ricky Puji Rahman, Sunarti Abd Raja Heru Nur Alam Ichsan, Raja Heru Nur Alam Randi Sanjaya Randi Sanjaya, Randi Reno Susanto Reski, M. Rinaldi Idroes Rizki, Juliana Rizky, Muhammad Dian Rozanna Sri Irianty Saparullah, Zulkarnaen Saryono Saryono Setiadi, Fydel Simbolon, Kristin Madelin Siregar, Thasya Nurfadillah Sitorus, Mesakh Fridolin Sugesti, Heni Suhendrayatna Suhendrayatna Sunarno Sunarno Surya, Andry Pratama Susanty, Wenny Susilowati Susilowati Syafi’i, Abdullah Syahputra, Dede SYAIFUL BAHRI Tengku Mukhlis Teuku Rizky Noviandy Topan Herianto Trina E. Tallei, Trina E. TRINA EKAWATI TALLEI Triwahyuni, Vanny Efia Ulfaa, Suci Mas’ama Ulima, Riris Warman Fatra, Warman Wenny Susanty Yelmida Azis Yemita, Sylvia Yudha, Ricky Satria Z Zulfansyah Zahriah, Zahriah Zohera, Zohera Zul Amraini, Said Zulfansyah Zulfansyah Zultiniar, Zultiniar