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Arief Budiman
Chemical Engineering Department Universitas Gadjah Mada
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Biochar from Slow Catalytic Pyrolysis of Spirulina platensis Residue: Effects of Temperature and Silica-Alumina Catalyst on Yield and Characteristics Siti Jamilatun; Ilham Mufandi; Arief Budiman; Suhendra Suhendra
Jurnal Rekayasa Proses Vol 14, No 2 (2020)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.56221

Abstract

The use of biochar varies on its ability as an adsorbent which adsorbs liquid or gas molecules. Biochar from Spirulina platensis residue (SPR) as an energy source, as its richness in nutrients, can be used as fertilizer and maintain water resources in plantations. Biochar can be used as an intermediary for the synthesis of nanotubes, activated carbon, carbon black, and carbon fiber. One of the essential things to be considered in the application of activated carbon from SPR is char’s characteristics. This study aimed to obtain data on the biochar and components from the pyrolysis of Spirulina platensis residue. The study was conducted in a fixed-bed reactor with electric heaters with a variety of temperatures (300-700 ⁰C) and the amount of silica-alumina catalyst (0-20%). The biochar weight was obtained by weighing the char formed at the end of the pyrolysis. The char characteristics were obtained by the surface area, total pore volume, and pore size analysis. Based on the study results, the relationship between temperature and the amount of catalyst on the characteristics of biochar was studied. The higher the pyrolysis temperature, the less biochar. Also, the use of catalysts can reduce the amount of biochar. The higher the temperature, the higher the surface area and the total pore volume while the pore radius was reduced. The optimum condition for maximum biochar yield in non-catalytic pyrolysis at a temperature of 300 ⁰C was 49.86 wt.%. The surface area, the total pore volume, and the pore radius at 700 ⁰C catalytic pyrolysis with 5% silica-alumina was obtained as 36.91 m2/g, 0.052 cm3/g, and 2.68 nm, respectively.Keywords: biochar; pore radius; silica-alumina; surface area; total pore volumeA B S T R A KPenggunaan biochar bervariasi pada kemampuannya sebagai adsorben dalam menjerap molekul cairan atau gas. Biochar dari residu Spirulina platensis merupakan sumber energi, karena kaya akan unsur hara, dapat digunakan sebagai pupuk dan pemeliharaan sumber daya air di perkebunan. Biochar dapat juga digunakan sebagai perantara untuk sintesis nanotube, karbon aktif, carbon black, dan serat karbon. Salah satu hal penting yang harus diperhatikan dalam aplikasi karbon aktif dari SPR adalah karakteristik arang. Penelitian ini bertujuan untuk mendapatkan data biochar dan komponen dari pirolisis residu Spirulina platensis. Penelitian dilakukan di reaktor fixed-bed dengan pemanas listrik dengan variasi suhu (300-700 ⁰C) dan jumlah katalis silika-alumina (0-20%). Berat biochar diperoleh dengan cara menimbang arang yang terbentuk pada akhir pirolisis. Sedangkan karakteristik arang diperoleh dari analisis luas permukaan, volume pori total, dan ukuran pori. Berdasarkan hasil studi hubungan antara suhu dan jumlah katalis terhadap karakteristik biochar yang telah diteliti, semakin tinggi suhu pirolisis maka biochar semakin sedikit. Selain itu, penggunaan katalis dapat mengurangi jumlah biochar. Sebaliknya, semakin tinggi suhu semakin besar luas permukaan, dan volume pori total serta radius pori-pori semakin berkurang. Kondisi optimum untuk biochar maksimum pada pirolisis non katalitik pada suhu  300 ⁰C adalah 49,86 wt.%. Luas permukaan, total volume pori, dan radius pori pada suhu 700 ⁰C untuk pirolisis katalitik silika-alumina 5% diperoleh masing-masing sebesar 36,91 m2/g, 0,052 cm3/g, dan 2,68 nm.Kata kunci: biochar; luas permukaan; radius pori; silika-alumina; total volume pori  
Valuable Chemicals Derived from Pyrolysis Liquid Products of Spirulina platensis Residue Siti Jamilatun; Budhijanto Budhijanto; Rochmadi Rochmadi; Avido Yuliestyan; Arief Budiman
Indonesian Journal of Chemistry Vol 19, No 3 (2019)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (356.615 KB) | DOI: 10.22146/ijc.38532

Abstract

With a motto of preserving nature, the use of renewable resources for the fulfillment of human needs has been seen echoing these days. In response, microalgae, a water-living microorganism, is perceived as an interesting alternative due to its easy-to-cultivate nature. One of the microalgae, which possess the potential for being the future source of energy, food, and health, is Spirulina plantesis. Aiming to identify valuable chemicals possibly derived from it, catalytic and non-catalytic pyrolysis process of the residue of S. plantesis microalgae has been firstly carried out in a fixed-bed reactor over the various temperature of 300, 400, 500, 550 and 600 °C. The resulting vapor was condensed so that the liquid product consisting of the top product (oil phase) and the bottom product (water phase) can be separated. The composition of each product was then analyzed by Gas Chromatography-Mass Spectrometry (GC-MS). In the oil phase yield, the increase of aliphatic and polyaromatic hydrocarbons (PAHs) and the decrease of the oxygenated have been observed along with the increase of pyrolysis temperature, which might be useful for fuel application. Interestingly, their water phase composition also presents some potential chemicals, able to be used as antioxidants, vitamins and food additives.
Equilibrium Modeling of Astaxanthin Extraction from Haematococcus pluvialis Putri Restu Dewati; Rochmadi Rochmadi; Abdul Rohman; Avido Yuliestyan; Arief Budiman
Indonesian Journal of Chemistry Vol 21, No 3 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.56965

Abstract

Astaxanthin is a natural antioxidant, and the highest content of this compound is found in Haematococcus pluvialis microalgae. Microwave-assisted extraction (MAE) is one of the environmentally friendly extraction methods and has many advantages. This study aims to investigate the extraction of astaxanthin through the MAE method using various solvents. Several equilibrium models were proposed to describe this solid-liquid equilibrium. The solid-liquid extraction equilibrium parameters were determined by minimizing the sum of squares of errors (SSE), in which equilibrium constants were needed for scaling up purposes. Previously, the microalgae were pretreated with HCl to soften their cell walls in order to improve the extraction recovery. In this study, dichloromethane, acetone, methanol, and ethanol were used as the solvents for extraction. The astaxanthin concentration was determined by high-performance liquid chromatography (HPLC) and spectrophotometry. Astaxanthin was found to attain equilibrium at 57.42% recovery in a single-step extraction. Thus, several steps were required in sequence to obtain an optimum recovery. The experimental data were fitted to three equilibrium models, namely, Henry, Freundlich, and Langmuir models. The experimental data were well fitted to all the models for the extraction in dichloromethane, methanol, ethanol and acetone, as evident from the almost same SSE value for each model.
The Effects of Particle Mesh and Temperature on Pyrolysis Spirulina platensis Residue (SPR): Pyrolysis Yield and Bio-Oil Properties Siti Jamilatun; Arief Budiman; Ilham Mufandi; Agus Aktawan; Nabila Fauzi; Defiani Putri Denanti
ASEAN Journal of Chemical Engineering Vol 22, No 1 (2022)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ajche.69439

Abstract

Microalgae is the third generation of biomass as renewable energy, a future energy source for making bio-oil. The purpose of this research is to examine the biomass from microalgae Spirulina platensis residue (SPR) using the pyrolysis process, to investigate the effect of particle mesh and temperature on the pyrolysis process, to determine the bio-oil properties, including density, pH, color, flame power, and conversion. Fixed bed reactor used for SPR pyrolysis with dimensions of 4.4 cm outside diameter, 4.0 cm inside diameter, and 60.0 cm reactor height. The temperature controls have been fitted from 300-600 °C combined with a 14-16 °C/minute heating rate. Spirulina platensis residue of 50 grams with various particle mesh (80 and 140 mesh) was fed to the reactor. From the experiment results, the particle mesh and temperature process are influenced by bio-oil yield, water phase, gas yield, biochar yield, conversion, and bio-oil properties, including density, pH, flame power, and color. One hundred forty mesh particles at a temperature of 500 °C showed the highest bio-oil yield with a yield of 22.92%, then the water, charcoal, and gas phases were 27.98, 18.84, and 30.26%, with a conversion of 81.16%. At the same time, 80 mesh particles at 500 °C yielded bio-oil, water, charcoal, and gas phases of 19.66, respectively; 23.10, 27.90, and 29.34%, with a conversion of 72.10%. In addition, density, pH, color, and flame power are described in this study.  
Appropriate Technology for Municipal Solid Waste Management Based on Wastepreneurship Implementation Diananto Prihandoko; Arief Budiman; Prabang Setyono; Chafid Fandeli; Maria Theresia Sri Budiastuti
ASEAN Journal of Chemical Engineering Vol 21, No 1 (2021)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ajche.64496

Abstract

Piyungan landfill is the biggest landfill in the Special Region of Yogyakarta, Indonesia, which receives municipal solid waste (MSW) from two districts and a city, while its designed service time has been over and faces operational obstacles. Meanwhile, the volume of the MSW grows rapidly and exceeds the reduction rate in their sources. The difficulty in finding a new landfill area is the reason why appropriate technological alternatives in the MSW management are strongly needed. Therefore, the study aimed to evaluate the social and economic aspects and formulate appropriate technology based on the waste entrepreneurship (wastepreneurship) concept. The methods of this study were conducting calculation of waste characteristics and composition, social evaluation, and economic evaluation of the combination of composting, incinerator, and sanitary landfill. Waste characteristics and composition were taken using direct field measurement following Indonesia's National Standard Guideline about retrieving and measuring examples of urban waste emergence and composition. Characteristics of waste are used for the calculation of calorific value and energy. The social evaluation was conducted using an in-depth interview with the rag pickers. The economic evaluation was conducted using net present value, internal rate of return, and payback period. The result of the study shows that Piyungan Landfill with total combustion waste reach 82.22% has the potential of incinerator implementation. In social evaluation, the implementation of composting and incinerator technologies would open employment for the surrounding community and rag pickers. The economic evaluation shows the combination of composting and incinerator technologies was economically feasible with an average profit margin of 12.97% in the operational period of 18 years. In conclusion, the concept of wastepreneurship is relevant in Piyungan Landfill by adjusting the MSW management paradigm from previously cost-center into business-center.
The Effect of Liquid Organic Fertilizer “Bio Ferti” Application on the Growth Rate of Spirulina platensis by Using Haldane Model M Iqbal Maulana Ginting; Eko Agus Suyono; Mochammad Donny Koerniawan; Lucia Tri Suwanti; Ulfah Juniarti Siregar; Arief Budiman
Journal of Tropical Biodiversity and Biotechnology Vol 7, No 2 (2022): August
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jtbb.68944

Abstract

This experimental research was performed to observe the influence of an agricultural liquid organic fertilizer called Bio Ferti on the growth and biomass of Spirulina platensis, aiming at replacing inorganic fertilizer with the liquid organic one. The cultivation of the microalgae was conducted over seven days at Nogotirto Algae Park. The liquid organic fertilizer, namely Bio Ferti, was obtained from the Faculty of Biology, Universitas Gadjah Mada, and prepared to have doses of 2, 4, 6, 8, and 10 mL. For comparison, an inorganic fertilizer with the same doses was also prepared. The variables to be observed were cell density, dry cell weight, and growth kinetics. The culture medium conditions observed were temperature, pH, and salinity (the optimum salinity was 20 ppt). The growth kinetic analysis was performed mathematically using numerical simulations using the Contois and the Haldane models. This research’s results showed that Bio Ferti affected the growth rate of Spirulina platensis. With a dose of 2 mL, it became the optimum medium which produced the highest density and dry weight of 1.78x106 cells/mL and 160 mg/mL, respectively. Meanwhile, the inorganic fertilizer with a dose of 10 mL produced the highest density and dry weight of 2,13x105 and 80 mg/mL, respectively. The temperature ranged from 28 to 31°C, while the pH ranged from 8.01 to 9.02 for each medium. The suitable model to describe the growth kinetics of Spirulina platensis was the Haldane model.
Thermal Decomposition and Kinetic Studies of Pyrolysis of Spirulina Platensis Residue Siti Jamilatun; Budhijanto Budhijanto; Rochmadi Rochmadi; Arief Budiman
International Journal of Renewable Energy Development Vol 6, No 3 (2017): October 2017
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.6.3.193-201

Abstract

 Analysis of thermal decomposition and pyrolisis reaction kinetics of Spirulina platensis residue (SPR) was performed using Thermogravimetric Analyzer. Thermal decomposition was conducted with the heating rate of 10, 20, 30, 40 and 50oC/min from 30 to 1000oC. Thermogravimetric (TG), Differential Thermal Gravimetric (DTG), and Differential Thermal Analysis (DTA) curves were then obtained. Each of the curves was divided into 3 stages. In Stage I, water vapor was released in endothermic condition. Pyrolysis occurred in exothermic condition in Stage II, which was divided into two zones according to the weight loss rate, namely zone 1 and zone 2. It was found that gasification occurred in Stage III in endothermic condition. The heat requirement and heat release on thermal decomposition of SPR are described by DTA curve, where 3 peaks were obtained for heating rate 10, 20 and 30°C/min and 2 peaks for 40 and 50°C/min, all peaks present in Zone 2. As for the DTG curve, 2 peaks were obtained in Zone 1 for similar heating rates variation. On the other hand, thermal decomposition of proteins and carbohydrates is indicated by the presence of peaks on the DTG curve, where lignin decomposition do not occur due to the low lipid content of SPR (0.01wt%). The experiment results and calculations using one-step global model successfully showed that the activation energy (Ea) for the heating rate of 10, 20, 30, 40 and 50oC/min for zone 1 were 35.455, 41.102, 45.702, 47.892 and 47.562 KJ/mol, respectively, and for zone 2 were 0.0001428, 0.0001240, 0.0000179, 0.0000100 and 0.0000096 KJ/mol, respectively.Keywords: Spirulina platensis residue (SPR), Pyrolysis, Thermal decomposition, Peak, Activation energy.Article History: Received June 15th 2017; Received in revised form August 12th 2017; Accepted August 20th 2017; Available onlineHow to Cite This Article: Jamilatun, S., Budhijanto, Rochmadi, and Budiman, A. (2017) Thermal Decomposition and Kinetic Studies of Pyrolysis of Spirulina platensis Residue, International Journal of Renewable Energy Development 6(3), 193-201.https://doi.org/10.14710/ijred.6.3.193-201
Experimental and Kinetic Modeling of Galactose Valorization to Levulinic Acid Retno Ringgani; Muhammad Mufti Azis; Rochmadi Rochmadi; Arief Budiman
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 2 Year 2022 (June 2022)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.2.14032.451-465

Abstract

Levulinic acid, a versatile chemical building block, was derived from C6-sugar galactose using sulfuric acid as the catalyst. Galactose is monosaccharide of polysaccharides constituent that is mostly contained in third generation biomass, macro-microalgae. It currently receives high attention to be a source of renewable feedstock. The effect of temperature, catalyst concentration and initial substrate loadings were studied for 60 min, in the temperature range of 150–190 °C, acid concentration of 0.25–0.75 M and initial substrate loading of 0.05–0.25 M. The highest levulinic acid yield of 40.08 wt% was achieved under the following conditions: 0.05 M galactose, 0.75 M acid concentration, 170 °C temperature, and 40 min reaction time. The kinetic model was developed by first order pseudo-irreversible reaction. The results showed that the proposed model could capture the experimental data well. These results suggested that galactose, derived from macro- and micro-algae, can potentially be converted and applied for platform chemicals. Copyright © 2022 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). 
The Effect of Various Photoperiodic Conditions and Zn2+ Concentrations on Growth Rate and Metabolite Content in Euglena sp: Effect of Photoperiod and Zn2+ on Euglena sp. Eko Agus Suyono; Budiman, Arief; Siti Ferniah, Rejeki; Astiti, Adam; Mardyansah, Deviko; Natalia, Fitri; Cindiati, Maya; Qonita Maghfiroh, Khusnul; Erfianti, Tia; Nurafifah, Istini; Amelia, Ria; Kurnianto, Dedy; Ryan Sadewo, Brilian; Maggandari, Revata
Journal of Tropical Life Science Vol. 14 No. 2 (2024)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.14.02.04

Abstract

The application of Euglena as a carbon capture organism has generated considerable interest among scientists. Through the photosynthesis process, many kinds of metabolites are produced by Euglena, such as lipids, proteins, and pigments. Due to the metabolites produced by Euglena, it is vital to optimize the carbon capture ability and cell growth rate by adding Zn2+ content and giving photoperiodic into Euglena culture. The purpose of this study is to identify the optimal photoperiod and Zn2+ concentration to increase the growth rate, biomass, and metabolite content of Euglena sp. This study is a laboratory experiment involving the cultivation of Euglena sp. in various photoperiod cycles (light:dark), namely 24:0, 12:12, 14:10, and 16:8. In addition, Euglena sp. was also cultivated using different concentrations of Zn2+ (0 ppm, 5 ppm, 10 ppm, and 15 ppm). The growth of Euglena sp. was monitored for 18 days before being harvested every three days to measure the research parameters, including primary and secondary metabolites. The results showed that the photoperiod treatment and various concentrations of Zn2+ had a significant impact (P<0.05) on the growth rate, biomass, lipid, carbohydrate, protein, chlorophyll, and carotenoid levels of Euglena sp.  
Sintesis Biodiesel dari Minyak Jelantah dengan Katalis K2CO3/y-Al2O3 Handayani, Fitriyani Yetti; Cahyono, Rochim Bakti; Budiman, Arief
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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

Abstract

Biodiesel is an environmentally friendly alternative fuels. The price of biodiesel is still relatively expensive due to the high price of raw materials. Thus, cheaper raw materials such as used cooking oils can be used. Used cooking oils can be used to produce biodiesel by transesterification reaction using alcohol and catalyst. The effect of temperature on the conversion was studied in this research. The research was carried out in batch at various temperatures of 45, 55 and 65 oC by reacting used cooking oil and bioethanol with catalyst K2CO3/γ-Al2O3. The ratio of used cooking oil and bioethanol is 1:9 and the concentration of catalyst is 3%. The reaction was run for 5, 10, 15, 30, 60, and 120 minutes, then the biodiesel was separated from the catalyst and glycerol. Furthermore, the biodiesel samples were analyzed by GC-MS to determine the alkyl ester content. The result showed that the highest conversion was 86.39% at 65oC. The biodiesel product complies with SNI 7182:2015, with a density of 871.7 kg/m3, kinematic viscosity of 4.82 mm2/s, flash point of 176oC, cloud point of 9oC, copper plate corrosion number 1, acid number 0.39 mg-KOH/g, total glycerol 0.16%, and ester content 98.3%.
Co-Authors . Widayat Abdul Ghofur Abdul Rohman Achmad Halim Purbohandono Achmad Rizky Fazar Achmad Roesyadi Adidtya Perdana, Adidtya Afkarina, Izzeh Aflah, Arief agung setiawan Agus Aktawan, Agus Agus Suyono, Eko Ahda Hafidz, Anggaditya Ahmad Agus Setiawan Ahmad Tawfiequrrahman Yuliansyah Aini, Apsari Puspita Akly, Faisal Akmal, M. Alfarisi, Muhammad Alisharsa, Muhammad Dafa Alita Lelyana Alwiyah Alwiyah Amelia, Ria Anastasia Ary Noviyanti Andhika Puspito Nugroho Andini Putri, Egydia Ardy Aprilian Anwar Ari Usman, Ari Arif Yulianto Widi Kurniawan Arifin, A. Zainul Arum Wulandari, Hesti Ashari, Maajid Surya Putra Astiti, Adam Avido Yuliestyan Aydogmus, Ilkay Baehaqi Boy Arief Fachri Budhijanto Budhijanto Budhijanto Budhijanto Budhijanto Budhijanto Budhijanto Budhijanto Budhijanto Budhijanto, Budhijanto Budi Budi Budi BUDI SETIADI DARYONO Burhanto, Burhanto Cahyono, Rochim Bakti Chafid Fandeli Cindiati, Maya Damaiyanti, Mukhripah Damayanti, Fera Daniar Rianawati David David Dedi Irwan Defiani Putri Denanti Demmanggasa, Yultan Dewayanto , Nugroho Dewi, RD. D. Lokita Pramesti Dewi, Rike Tri Kumala Diana Diana Diananto Prihandoko Diansyah, T.M Diena Yudiarti Dwi Pratiwi Edy Yulianto Eko Agus Suyono Eko Agus Suyono Ely Afridiana Kuncoro Eni Budiyati Erfianti, Tia Erna Ferrinadewi Febrian, Wenny Desty Fitri Annisah lubis, Yessi Fitri Natalia Fitri, Linda Dwi Novial Galang Fitrianto, Wisesa Ghifari, Muhmmad Nurshandy Al Gusti, Alexander Kenzy Pinaring H Hadiyanto H.M. Edwar Juliartha Handayani, Fitriyani Yetti Handayani, Septy Handoko, Divi Harahap, Herlina Hary Sulistyo Heri Heriyanto Heri Rustamaji Herti Utami Husaini, M. Hutasuhut, Muhammad Rizki Hamdani Ilham Mufandi Ilham Mufandi Imas Komariah, Imas Imran Lubis Indriana Lestari Irgie, Rafi Irwan Setyaji ISKANDAR Istiqomah, Aisa Fadhilatul Jarman Arroisi Joko Waluyo Karilanata, Khalid Erlangga Khalidy, Furqan Kinanti, Isnatul Agil Kurnianto, Dedy Kurniawan, Aries Taufiq Kurniawan, Yulius Kusmeri, Kusmeri Kustiawan, Unggul Kusuma, Melvin Aryadika Lakilaki, Eogenie Laksana, Rio Dhani Lestari, Dwi Indah Lestari, Yuyun Dwi Lucia Tri Suwanti, Lucia Tri M Iqbal Maulana Ginting Maggandari, Revata Mahfuddin, Rohmat Makalew, Paulina Vega Mardiah Mardiah Mardyansah, Deviko Margaretha Praba Aulia Maria Theresia Sri Budiastuti Martomo Setyawan Marwa, Annisa Masduki Maswani Maswani, Maswani Mien Rukmini, Mien Minny Elisa Yanggah Mitha Puspitasari Mochammad Donny Koerniawan Muhammad Mufti Azis Muhammad Rivai Muhammad Saifi Muhammad Yudhi Rezaldi, Muhammad Yudhi Muis Murtadho Munadi, Yudhi Muzakar Isa Nabila Fauzi Nadza, Reza Nainggolan, Theodora MV Natalia, Fitri Naufalina, Fariha E Norjannah, Norjannah Nugroho Dewayanto, Nugroho Nur Wulan, Nur Nurafifah, Istini Nuril Huda Nurtiar, Haryo Oktafia, Linda Ortiz, Edixon Daniel Pandjaitan, Manahan Budiarto Panut Mulyono Pauzi, Riky Pereira, Julio Prabang Setyono Pradana, Yano Surya Prakasa, Razaan Mauli Al-Farizi Prasakti, Laras Prasetyo, Ridwan Budi Prima Astuti Handayani Putri Restu Dewati Putri, Renata Adaranyssa Egistha Qonita Maghfiroh, Khusnul R Rochmadi Rachmat Aulia, Rachmat Rachmawan Budiarto Ratna Dewi Kusumaningtyas Rediono, Erwin Regita, Nira C. Ridwan Budi Prasetyo Ringgani, Retno Riski, Sari Kurnia Rochmadi Rochmadi Rochmadi Rochmadi Rochmadi Rochmadi Rochmadi Rochmadi Rochmadi Rochmadi Rochmadi Rochmadi Rochmadi Rochmadi Rochmadi Rochmadi Rojuaniah Rojuaniah Roto Roto Rozy, Ahmad Rusmiati, Elis Ryan Sadewo, Brilian S Sutijan Sadewo , Brilian Ryan Sarudin Sarudin, Sarudin Septiyaningsih Septiyaningsih Setianto, Diki Putra Setiantoro, Arief Eko Sholeh, Aminuddin Sihotang, Ferryanto Simanungkalit, Muhammad Iqbal Arghribi Sinaga, Jepriando Siregar, Muhammad Ramulia Siregar, Yosua Arihta R. Sada Siti Ferniah, Rejeki Siti Jamilatun Siti Jamilatun Siti Khadijah siti mudrikah Siti Soekiswati Siti Sundari Sitompul, Siti Cholijah Solly Aryza Sri Dwi Astuti Al Noor Sucahyati, Diarany Sugeng, Joko Suhendra Suhendra Suhendra Suhendra Sulistyawati Sulistyawati Sumitro Sumitro Suriati, Suriati Suryo Purwono Susanto, Try Sutijan Sutijan Sutijan Sutijan Sutijan Suyono, Dr. Eko Agus Syahputra, Tengku Tantri Yanuar Rahmat Syah Tarigan, Duncan Dancin Tiara Radinska Deanda Tommy Munaf Tommy, Tommy Topani, Ilham Tri Wahyu Setyaningrum, Tri Wahyu Ulfah Juniarti Siregar Ummul Khair Usman, Arie Utami, Dewi Ayu Anggraeni Vendy, Vicky Verawati, Linda Wahyu Wilopo Wahyudi Budi Sediawan Widodo, Condro widyastuti, ira Wijaya, R. Muh Syah Arief Atmaja Wiyono, Edi Wusana Agung Wibowo, Wusana Agung Yessi Fitri Annisah Lubis Yosa Fiandra Yulius Hari Yunita Sari Yuslainiwati, Yuslainiwati