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All Journal Reaktor International Journal of Science and Engineering (IJSE) International Journal of Renewable Energy Development TEKNIK METANA JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmu Lingkungan JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Bulletin of Chemical Reaction Engineering & Catalysis Communications in Science and Technology ASEAN Journal of Chemical Engineering Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Journal Of Sustainability Perspectives Pharmaceutical Sciences and Research (PSR) Journal of Sustainability Perspectives International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis
Dessy Ariyanti
Department Of Chemical Engineering, Universitas Diponegoro, Semarang 50275, Indonesia
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Public Health

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STUDI KARAKTERISTIK BIOPOLIMER GRACILARIA VERRUCOSA SEBAGAI BAHAN PENJERAP Ariyanti, Dessy; Nurcahyani, Intan
Jurnal Ilmu Lingkungan Vol 10, No 2 (2012): Oktober 2012
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (715.774 KB) | DOI: 10.14710/jil.10.2.85-88

Abstract

ABSTRAK Keberadaan logam berat Cu dalam limbah industri dapat berakibat buruk bagi lingkungan. Gracilaria verrucosa ditujukan sebagai bahan alternatif yang ramah lingkungan pengganti polimer sintetis untuk proses biosorpsi logam berat Cu. Pada penelitian ini dipelajari karakteristik kemampuan penjerapan dari biopolimer Gracilaria verrucosa terhadap logam berat Cu. Pada proses biosorpsi Cu2+ kapasitas biosorpsi maksimum sekitar 38.34 mg/gr. Kapasitas biosorpsi dicapai pada t=15 menit dan pH larutan= 4. Data kesetimbangan proses biosorpsi ini dapat dimodelkan dengan persamaan Langmuir. Keberadaan NH4+ dalam larutan tidak terlalu berpengaruh terhadap proses biosorpsi logam berat Cu. Hasil penelitian disimpulkan bahwa biopolimer Gracilaria verrucosa memiliki potensi sebagai bahan alternatif dalam proses pemisahan trace element dengan kapasitas biosorpsi yang tinggi. Kata kunci : Gracilaria verrucosa, alga merah, biosorpsi  logam berat ABSTRACT The presence of heavy metals such as Cu in industrial wastewater can lead to the environment contamination. The algae Gracilaria verrucosa is intended to be the environmentally friendly polymer used in biosorption process of heavy metals Cu. In this research, the characteristics and adsorption ability of biopolymers Gracilaria verrucosa against heavy metals Cu was studied respectively. Results shown that the maximum biosorption capacity of Gracilaria verrucosa in adsorbing Cu2+ was 38.34 mg/gr at t = 15 min and pH = 4. Equilibrium data of biosorption process can be modeled by Langmuir equation. The presence of NH4 + in solution does not significantly affected the biosorption process of heavy metals Cu. It can be concluded that biopolymer Gracilaria verrucosa has potential as an alternative material with high biosorption capacity in removing trace elements. Keywords: Gracilaria verrucosa, red algae, heavy metals biosorption
APLIKASI TEKNOLOGI REVERSE OSMOSIS UNTUK PEMURNIAN AIR SKALA RUMAH TANGGA Ariyanti, Dessy; Widiasa, I N.
TEKNIK Volume 32, Nomor 3, Tahun 2011
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (369.882 KB) | DOI: 10.14710/teknik.v32i3.1735

Abstract

Initially, commercially available reverse osmosis (RO) systems were intended to use on ships for producing freshwater during long voyages. After the time, many developments have been conducted especially in membraneelement and system configuration. Such developments allow RO systems to be applied for home use with normalplumbing in households. A basic reverse osmosis system consists of a pressurized source of water, a membranesystem, and hoses of pipes that carry off and separate clean water and drain water. There are four types ofhousehold RO system, i.e.: undersink, whole house, multi family, farm and ranch. If a water quality problem isdue to several different contaminants, RO may be the most cost-effective method for their removal.
MIKROALGA SEBAGAI SUMBER BIOMASA TERBARUKAN: TEKNIK KULTIVASI DAN PEMANENAN Ariyanti, Dessy; Handayani, Noer Abyor
METANA Vol 6, No 02 (2010): Desember 2010
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (198.5 KB) | DOI: 10.14710/metana.v6i2.3431

Abstract

Abstract   For millennia, aquatic environment has been a source of food, minerals, and natural products to fulfill human’s need. In order to resolved problem due to increment of population, the development of product microalgae based which is one of renewable resource absolutely needed.   There are two important processes in biotechnology of microalgae, microalgae cultivation and harvesting. Common cultivation methods used in growing microalgae are open raceway pond system and closed photobioreactor system. While harvesting methods used is flocculation, centrifugation and filtration. This paper described briefly the methods used in cultivation and harvesting of microalgae.   Keywords: microalgae, cultivation, harvesting
Penentuan Proses Pretreatment untuk Pemanfaatan Limbah Kulit Singkong sebagai Bahan Baku Bioetanol melalui Hidrolisa Enzimatis menggunakan Aspergillus spp. Ariyanti, Dessy; Purbasari, Aprilina; Kusumayanti, Heny; Handayani, Noer Abyor
METANA Vol 15, No 1 (2019): Juni 2019
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (785.67 KB) | DOI: 10.14710/metana.v15i1.22965

Abstract

Ketergantungan terhadap bahan bakar fosil ini menjadi masalah besar yang sangat mendesak untuk segera diselesaikan. Salah satu langkah solusi yang bisa dilakukan adalah memanfatkan bioetanol lignoselulosa dari limbah kulit singkong sebagai alternatif pengganti. Permasalahan utama yang menghambat penggunaan kulit singkong sebagai bahan baku utama pembuatan bioetanol adalah belum adanya proses pretreatment dan hidrolisa yang terbukti efektif secara teknis maupun ekonomis untuk mengkonversi lignoselulosa yang terkandung dalam kulit singkong menjadi bentuk gula sederhana. Penelitian ini dilaksanakan untuk mengetahui efektifitas proses pretreatment dan hidrolisa untuk mengkonversi lignoselulosa yang terkandung dalam kulit singkong menjadi bentuk gula sederhana. Metode pretreatment asam (H2SO4) dan organosolv (Etanol + CH3COONa) terbukti dapat meningkatkan yield gula tereduksi hingga 50% dibandingkan dengan proses hidrolisa tanpa pretreatment. Yield hingga 78% dapat diperoleh pada proses pretreatment asam suhu 30oC, waktu 30 menit yang dilanjutkan dengan hidrolisa enzimatik dengan Aspergillus niger selama 48 jam. Peningkatan yield pada proses pretreatment organosolv (optimum 74% pada suhu 30oC, waktu 90 menit) masih dapat dilakukan dengan meningkatkan waktu operasi dan meningkatkan suhu operasi. Namun peningkatan suhu maupun penambahan waktu operasi berpengaruh terhadap analisa teknis dan ekonomis dari proses. Secara teknis, pretreatment organosolv lebih mudah dilakukan terutama pada proses dengan kondisi operasi atmosferik dibandingkan dengan pretreatment asam karena sifat bahan kimia yang digunakan dan penanganannya. Secara ekonomis, pretreatment asam lebih baik untuk diaplikasikan dibandingkan pretreatment organosolv, hal ini dikarenakan yield yang dihasilkan lebih tinggi pada kondisi proses atmosferik. Lignocellulose material derived from cassava peel can be utilized as raw material for bioethanol production. The utilization of this material can be part of solution in order to maintain Indonesia’s energy security which still majority covered by the fossil fuel. The main problem of lignocellulose conversion into bioethanol is their crystalline structures those make them really difficult to be converted into monomeric sugar prior fermentation to produce ethanol. The objective of this research is to find out the effectiveness of pre-treatment process prior enzymatic hydrolysis of lignocellulose contained on cassava peel. The result shows pre-treatment methods both acid (H2SO4) and organosolv (Etanol + CH3COONa) proved to be effective in order to increase the yield of total reducing sugar (TRS) until 50% after enzymatic hydrolysis compared to the sample without pre-treatment. Highest yield 78% can be achieved by applying acid pre-treatment under temperature 30oC and 30 minutes of process prior enzymatic hydrolysis by Aspergillus niger under temperature 35oC for 48 hours. Further optimization in organosolv pre-treatment can be conducted by increasing the temperature and prolong the process into certain extent. It should be noted that the above action could influence the feasibility of the organosolv pre-treatment technically and economically. From technical point of view, organosolv pre-treatment can be more feasible compared to acid pre-treatment (under atmospheric condition) as the reagents are easy to handle in terms of safety consideration. However, from economic side acid pre-treatment is more preferable as higher yield of the process and lower volume of chemical can be used in order to achieve the same amount of product. 
Potency of Solar Energy Applications in Indonesia Handayani, Noer Abyor; Ariyanti, Dessy
International Journal of Renewable Energy Development Vol 1, No 2 (2012): July 2012
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.1.2.33-38

Abstract

Currently, 80% of conventional energy is used to fulfill general public's needs andindustries. The depletion of oil and gas reserves and rapid growth in conventional energyconsumption have continuously forced us to discover renewable energy sources, like solar, wind,biomass, and hydropower, to support economic development in the future. Solar energy travels at aspeed of 186,000 miles per second. Only a small part of the radiant energy that the sun emits intospace ever reaches the Earth, but that is more than enough to supply all our energy demand.Indonesia is a tropical country and located in the equator line, so it has an abundant potential ofsolar energy. Most of Indonesian area get enough intensity of solar radiation with the average dailyradiation around 4 kWh/m2. Basically, the solar systems use solar collectors and concentrators forcollecting, storing, and using solar radiation to be applied for the benefit of domestics, commercials,and industrials. Common applications for solar thermal energy used in industry are the SWHs, solardryers, space heating, cooling systems and water desalination.
Microbial Fuel Cells for Simultaneous Electricity Generation and Organic Degradation from Slaughterhouse Wastewater Christwardana, Marcelinus; Prabowo, Adrianus Kristyo; Tiarasukma, Agnes Priska; Ariyanti, Dessy
International Journal of Renewable Energy Development Vol 5, No 2 (2016): July 2016
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.5.2.107-112

Abstract

Microbial fuel Cell (MFC) has gained a lot of attention in recent years due to its capability in simultaneously reducing organic component and generating electricity. Here multicultural rumen microbes (RM) were used to reduce organic component of slaughterhouse wastewater in a self-fabricated MFC. The objectives of this study were to determine the MFC configuration and to find out its maximum capability in organic degradation and electricity generation. The experiments were conducted by employing, different types of electrode materials, electrode size, and substrate-RM ratio. Configuration of MFC with graphite-copper electrode 31.4 cm2 in size, and substrate-RM ratio 1:10 shows the best result with current density of 318 mA m-2, potential  2.4 V, and achieve maximum power density up to 700 mW m-2. In addition, self-fabricated MFC also shows its ability in reducing organic component by measuring the chemical oxygen demand (COD) up to 67.9% followed by increasing pH from 5.9 to 7.5. MFC operating at ambient condition (29oC and pH 7.5), is emphasized as green-technology for slaughterhouse wastewater treatment. Article History: Received March 26, 2016; Received in revised form June 20, 2016; Accepted June 25, 2016; Available onlineHow to Cite This Article: Prabowo, A.K., Tiarasukma, A.P., Christwardana, M. and Ariyanti, D. (2016) Microbial Fuel Cells for Simultaneous Electricity Generation and Organic Degradation from Slaughterhouse Wastewater. Int. Journal of Renewable Energy Development, 5(2), 107-112.http://dx.doi.org/10.14710/ijred.5.2.107-112 
Enhancing Ethanol Production by Fermentation Using Saccharomyces cereviseae under Vacuum Condition in Batch Operation Abdullah, Abdullah; Ariyanti, Dessy
International Journal of Renewable Energy Development Vol 1, No 1 (2012): February 2012
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.1.1.6-9

Abstract

Ethanol is one of renewable energy, which considered being an excellent alternativeclean-burning fuel to replaced gasoline. In fact, the application of ethanol as fuel still blended withgasoline. The advantages of using ethanol as fuel are that the raw material mostly from renewableresources and the product has low emission which means environmental friendly. Ethanol can beproduced by fermentation of sugars (glucose/fructose). The constraint in the ethanol fermentationbatch or continuous process is the ethanol product inhibition. Inhibition in ethanol productivityand cell growth can be overcome by taking the product continuously from the fermentor. Theprocess can be done by using a vacuum fermentation. The objective of this research is toinvestigate the effect of pressure and glucose concentration in ethanol fermentation. The researchwas conducted in laboratory scale and batch process. Equipment consists of fermentor withvacuum system. The observed responses were dried cells of yeast, concentration of glucose, andconcentration of ethanol. Observations were made every 4 hours during a day of experiment. Theresults show that the formation of ethanol has a growth-associated product characteristic undervacuum operation. Vacuum condition can increase the cell formation productivity and the ethanolformation, as it is compared with fermentation under atmospheric condition. The maximum cellsproductivity and ethanol formation in batch operation under vacuum condition was reached at166.6 mmHg of pressure. The maximum numbers of cells and ethanol formation was reached at141.2 mm Hg of pressure. High initial glucose concentration significantly can affect the productivityand the yield of ethanol.
Enhanced adsorption property of TiO2 based nanoribbons produced by alkaline hydrothermal process Ariyanti, Dessy; Mo’ungatonga, Satriani; Gao, Wei
METANA Vol 16, No 2 (2020): Desember 2020
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/metana.v16i2.33428

Abstract

TiO2 is a semiconductor material with endless potential for the development of renewable energy as well as in the environmental field application. With various methods, TiO2 nanostructures with various morphology, properties and application can be developed. In this paper, the synthesis of TiO2 based nanoribbons with high adsorption property produced by alkaline hydrothermal methods were investigated. Its morphology, crystal structure and physical properties were characterized using Scanning Electron Microscope (SEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) and Brunauer-Emmett-Teller (BET) surface area analysis. The result shows that by controlling the hydrothermal processing time, different morphology and structures of TiO2 nanoribbons with different adsorption properties can be obtained. The nanoribbons produced via alkaline hydrothermal method has width 200-300 nm and length up to several microns. It also possesses fair adsorption capacity over dyes (Rhodamine B and Methyl orange) considering its large surface area and high pore volume. 
Study on Organic Redox Flow Battery Mechanism using TEMPO and FMN-Na Solutions Faishal Maulana Kusumah; Dita Baeti Pridiana; Peter Kusnadi; Dessy Ariyanti
Reaktor Volume 19 No. 3 September 2019
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (562.516 KB) | DOI: 10.14710/reaktor.19.3.96-100

Abstract

Among numerous energy storage technologies, redox flow battery is one of the promising technologies that can be used to supply reliable continuation of electricity to electricity grids with a scale up to MW or MWh.  In this paper, the process mechanism and optimization of redox flow battery using organic solution such as Riboflavin-5’-phosphate sodium salt dihydrate (FMN-Na) as anolyte and 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) as catholyte were investigated. Sodium and chloride ions in salt feed were moved respectively to anolyte and catholyte by electrochemical reaction of electrolytes during the charge process and return to the feed during the discharge process. The study was carried out by given electric current with different voltage to graphite electrode range 1,5-10,5 volts and TEMPO concentration 0,02-0,08 M. The result shows that the optimum voltage is 7,5 volts with the concentration of TEMPO 0,06 M. The result also confirms the role of TEMPO solutions in the cathode. In addition to that, the FTIR and SEM analysis to the sedimentation generated during the process also revealed the change of the anolyte and catholyte after charging process.Keywords: Organic; Flow Battery; TEMPO; FMN-Na; energy storage
MODIFIKASI TEPUNG UMBI TALAS BOGOR (COLOCASIA ESCULENTUM (L) SCHOTT) DENGAN TEKNIK OKSIDASI SEBAGAI BAHAN PANGAN PENGGANTI TEPUNG TERIGU Dessy Ariyanti; C Sri Budiyati; Andri Cahyo Kumoro
Reaktor Volume 15, No.1, APRIL 2014
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (457.271 KB) | DOI: 10.14710/reaktor.15.1.1-9

Abstract

Tanaman talas bogor (Colocasia esculentum (L) Schott) sangat mudah dibudidayakan di daerah tropik dan sub-tropik, termasuk Indonesia. Umbi talas bogor kaya akan karbohidrat, sehingga dapat digunakan sebagai sumber energi yang potensial bagi manusia melalui berbagai proses modifikasi. Tujuan dari penelitian ini adalah memperbaiki kualitas tepung umbi talas bogor dengan mengkaji pengaruh konsentrasi suspensi, katalis, oksidator, dan temperatur dari proses modifikasi dengan cara oksidasi menggunakan larutan hidrogen peroksida (H2O2). Variabel yang dikaji adalah suspensi tepung dengan air (40, 30, 20, dan 10%), waktu reaksi (30, 60, 90, dan 120 menit, konsentrasi katalis (0; 0,1%; 0,2%), konsentrasi oksidator (1%, 2% dan 3%) dan temperatur (30; 40; 50oC). Hasil penelitian menunjukkan bahwa penggunaan konsentrasi suspensi 40% , konsentrasi katalis 0,1%, konsentrasi H2O2 2% dan temperatur 30oC pada waktu oksidasi 30 menit memberikan hasil yang paling optimum ditinjau dari daya kembang (swelling power) dengan nilai 7g/g dan kelarutannya dalam air yaitu 4% dengan mempertimbangkan aspek teknis dan ekonomis dari proses. Hasil penelitian ini menunjukkan bahwa penggunaan H2O2 sebagai oksidator cukup efektif dalam meningkatkan nilai daya kembang tepung talas bogor yang sebelumnya hanya 4,3 g/g menjadi 7 g/g, dimana nilai tersebut telah masuk dalam rasio daya kembang tepung terigu yaitu 6,8-7,9 g/g. Namun oksidator H2O2 tidak cukup efektif dalam meningkatkan nilai kelarutan tepung dalam air yang sebelumnya hanya 2% menjadi 4%, dimana nilai tersebut masih dibawah rasio kelarutan tepung terigu yaitu 6,3-7,3%. Selain itu uji organoleptik pada kue kering berbahan baku tepung umbi talas bogor teroksidasi menunjukkan kelemahan berupa rasa yang agak pahit dan tekstur yang terlalu rapuh dibandingkan dengan kue kering yang menggunakan bahan baku tepung terigu.Bogor taro (Colocasia esculentum (L) Schott) is one of the local resources which can be used as raw material for flour and starch production. They are easy to cultivate in tropical and sub-tropical area such as Indonesia. Tubers of Bogor taro contain a lot of carbohydrates and the flour can be modified using several technique of modification in order to achieve the similar content and properties as wheat flour. The objective of this research was to upgrade the quality of tuber Bogor taro flour by studying the effect of suspension consistency (40; 30; 20;10%), concentration of catalyst (0; 0.1%; 0.2%) and H2O2 (1%; 2% and 3%) as oxidizer and temperature of oxidation process (30; 40; 50oC). The results showed that the use of 40% suspension consistency, 0.1% catalyst concentration, 2% H2O2 concentration and 30oC of oxidation temperature at 30 minutes gave the most optimum results in terms of swelling power with 7g/g and water solubility 4% with taking the technical and economic aspects of the process as consideration. Swelling power and water solubility of modified tuber of Bogor taro flour were higher compared to the native ones, which successively 4.3 g/g and 2%. However, in organoleptic analyses showed that the cookies made from modified flour of Bogor taro tuber still have weaknesses such as a bitter taste and fragile textures compared to the cookies made from wheat flour.
Co-Authors Adi Saputra, Erwan Adrianus Kristyo Prabowo, Adrianus Kristyo Afiatin Afiatin Agnes Priska Tiarasukma Aji Prasetyaningrum Ambariyanto , Andri Cahyo Kumoro Aprilina Purbasari Apsari Puspita A. Azizah, Nadya Ummi Bakti Jos Bayu Samudra, Muhammad C Sri Budiyati Catarina Sri Budiyati Denny Nugroho Sugianto Desiyantri Siti P. Diah Susetyo Retnowati Dita Baeti Pridiana Erwan Adi Saputro Faishal Maulana Kusumah Filicia Wicaksana H Hadiyanto Hamzah, Fazlena Handayani, Elinna Putri Hapsari, Farida Diyah Heny Kusumayanti Herman Suryadi I N. Widiasa Intan Nurcahyani Junye Dong Junzhe Dong Khoirul Huda Lesdantina, Dina Maksum Radji Marcelinus Christwardana Mo’ungatonga, Satriani Noer Abyor Handayani Peter Kusnadi Purwanto Purwanto Purwoko, Agus Pury Diana Shintawati Saputra, Erwan Adi Setia Budi Sasongko Slamet Priyanto Srivastava, Vimal Chandra Wei Gao Wei Gao Wei Gao Yos Johan Utama