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All Journal Majalah Forum Teknik UGM Jurnal Rekayasa Proses Reaktor Seminar Nasional Teknik Kimia Kejuangan Journal of Engineering and Technological Sciences Jurnal Riset Industri Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Jurnal Rekayasa Proses Jurnal Teknologi ASEAN Journal of Chemical Engineering Jurnal Teknologi Bahan dan Barang Teknik Indonesian Journal Of Energy And Mineral

Aswati Mindaryani

Department Of Chemical Engineering, Faculty Of Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia

Author-ID : 236249

Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Kinetic Parameters Determination of Benzene Vapor Adsorption on Activated Carbon Using Differential Permeation Technique Aswati Mindaryani; Boma W. Tyoso; Wahyudi B. Sediawan; Supranto Supranto
ASEAN Journal of Chemical Engineering Vol 5, No 1 (2005)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Equilibrium and kinetic data are very important for a reliable design of a large-scale adsorption system. The objective of the research was to determine the particle scale kinetic parameters of strongly adsorbed volatile organic compounds (VOCS)in activated carbon (AC) by using the differential permeation technique. The experimental rig consisted basically of upstream and downstream reservoirs separated by a slab-shaped AC that is 2 mm thick. After cleaning the slab overnight at 400 K and under vacuum condition, the experiment was started by opening the valve to allow vapor to diffuse through the AC. The upstream and downstream pressures were continuously recorded until equilibrium was reached. Another experiment was run by increasing incrementally the upstream pressure. The same experiment was carried out using nonadsorbed gas (argon) to estimate both Knudsen permeability and viscous permeability. The Knudsen, viscous, and surface diffusivities were determined by matching the total permeability against the experimental data. From the data obtained, it was found that both porosity and surface diffusivity change with loading. The surface diffusivity of benzene vapor in AC pores does not follow the Darken model, but it follows the hydrodynamic model of Gilliland, especially when the porosity is relatively constant at high loading. Keywords: Adsorption, benzene, differential permeation, kinetic, and volatile organic compounds (VOCs).

Pengaruh Rasio Jumlah Resin terhadap Air pada Adsorpsi Gas Karbon Dioksida Menggunakan Resin Komersial Anies Mutiari; Aswati Mindaryani
Jurnal Teknologi Bahan dan Barang Teknik Vol 4, No 1 (2014)
Publisher : Center for Material and Technical Product

Biogas is one of the most promising source of alternative energy, but there is still a problem regarding the reduction of combustion heat due to the level of impurities, i.e. carbondioxide (CO2), which is around 25-45%. One of the most feasible way to reduce the concentration of carbondioxide is adsorption. In this research, adsorption was done using strong base anion exchanger resin, by using Purolite Resin and Dowex Marathon A Resin. Adsorption using this method was done by diluting CO2 in water, where the reaction of forming HCO3- will occur. These HCO3- ions will be adsorbed on the resin surface by means of ion exchange, and the solid-liquid equilibrium was approached by Langmuir method. To increase the solubility of CO2 in water, low temperature variations were used in this research. The amount of resin were also varied in order to understand the optimum composition, the variations of resin to water ratio were 1:3, 1:4 and 1:6. The result shows that the concentration of H2CO3 and HCO3- formed gradually increases over time, yet the concentration of CO2 did not show the same pattern; it decreases until a particular time, and then increases until it approaches its initial concentration due to the effects of system equilibrium. The reaction and adsorption time is also counted as the function of resin-water ratio. Biogas merupakan salah satu sumber energi alternatif yang sangat menjanjikan, namun permasalahan yang sering muncul ialah berkurangnya panas pembakaran akibat kadar impurities berupa karbondioksida (CO2) yang masih cukup besar, yaitu sekitar 25-45%. Salah satu cara yang cukup baik dan ekonomis untuk mengurangi kadar karbondioksida yaitu dengan cara adsorpsi. Metode adsorpsi dalam penelitian ini menggunakan adsorben berupa Strong Base Anion Exchange Resin dengan jenis Resin komersial Purolite dan Dowex Marathon A. Metode adsorpsi ini menggunakan mekanisme pelarutan gas CO2kedalam air, sehingga akan terjadi reaksi pembentukan ion HCO3-. Ion HCO3-ini akan diserap pada permukaan resin melalui mekanisme pertukaran ion dengan metode pendekatan kesetimbangan padat cair Langmuir. Untuk meningkatkan kelarutan CO2didalam air maka pada penelitian ini dilakukan variasi resin yang digunakan, yaitu 1:3, 1:4 dan 1:6 dengan tujuan untuk mencari komposisi dengan jumlah resin yang optimum dan ekonomis. Dari hasil percobaan dapat dilihat bahwa pola H2CO3dan HCO3- yang terbentuk selalu meningkat setiap waktu, namun pola konsentrasi CO2 yang teramati menunjukkan penurunan sampai waktu tertentu dan meningkat lagi sampai konsentrasi awalnya akibat kesetimbangan sistem. Selain itu, laju reaksi dan adsorpsi di permukaan resin juga terhitung sebagai fungsi rasio resin terhadap air.

Pemodelan Matematis Adsorpsi CO2 dengan Strong Base Anion Exchange Resin sebagai Adsorben untuk Purifikasi Biogas Anies Mutiari; Wiratni Wiratni; Aswati Mindaryani
Jurnal Teknologi Bahan dan Barang Teknik Vol 5, No 1 (2015)
Publisher : Center for Material and Technical Product

Biogas purification processes are widely conducted to remove CO2 content and enhance CH4 content. High content of CH4 will increase the performance of biogas significantly. Mathematical modelling in adsorption processes were derived from the two fim theory. The gas phase, liquid phase and solid phase were reviwed. Mathematical modelling was derived from the rate processes and equilibrium experiment in chemical adsorption of CO2 by ion exchange mechanism in a packed column. Mathematical modelling was purposed to get the coefficients value which was needed to scale up the processes or to design the process equipment. The rate processes coefficients value sought from the simulation was volumetric mass transfer coefficient of CO2 in the liquid phase (kLa), volumetric mass transfer coefficient of CO2 in the gas phase (kGa) and the reaction rate coefficients(k1 and k2). The Sum of Squares Error (SSE) value of rate proceses parameters kGa, kLa, k1 and k2 were 0.0431 in average. The model predictions value of kGa and kLa were compared to the theoretical value and the error were 18.79% and 7.29%, respectively.Pemurnian biogas telah banyak dilakukan untuk menghilangkan kadar CO2 dan meningkatkan kandungan CH4 yang terkandung di dalamnya. Kandungan CH4 yang tinggi akan memberikan unjuk kerja yang lebih baik. Model matematis proses adsorpsi CO2 disusun berdasarkan teori lapisan film antar fasa, dimana pada proses yang ditinjau terdapat tiga fase yaitu gas, cair dan padat. Model matematis dari data eksperimental kecepatan dan kesetimbangan proses adsorpsi CO2 melalui mekanisme pertukaran ion di suatu kolom adsorpsi telah dibuat. Model ini dibuat untuk mencari konstanta yang dapat dipergunakan pada proses scale up data laboratorium ke skala pilot plant. Parameter proses kecepatan yang dicari nilainya adalah koefisien transfer massa massa volumetris CO2 pada fase cair (kLa), koefisien transfer massa volumetris CO2 pada fasegas (kGa) dan tetapan laju reaksi (k1 dan k2). Pada hasil penelitian ini ditunjukkan bahwa nilai parameter yang diperoleh sesuai hasil fitting data dengan model matematis yang digunakan, yaitu model transfer massa pada lapisan film antar fase secara seri: adalah kGa, kla, k1 dan k2 dengan nilai Sum of Squares Error (SSE) rata-rata 0,0431. Perbandingan nilai kGa hasil simulasi dan teoritisnya memberikan kesalahan rata-rata 18,79%. Perbandingan nilai kLa hasil simulasi dan teoritis memberikan kesalahan rata-rata 7,92%.

Pengaruh Konsentrasi Sabun Terhadap Biodegradasi Limbah Cuci Piring Dengan Aerobic Suspension Culture Divita Hayyu Kinanthi; Aswati Mindaryani
Indonesian Journal of Energy and Mineral Vol. 2 No. 1 (2022): Indonesian Journal of Energy & Mineral
Publisher : Politeknik Energi dan Mineral Akamigas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53026/IJoEM/2022/2.1/999

Usaha warung makan terus berkembang mengingat masyarakat yang mayoritas lebih suka membeli makanan dari pada memasak sendiri. Seiring dengan terus berkembangnya industri warung makan, limbah cuci piring yang dihasilkan juga semakin meningkat dan umumnya limbah ini dibuang tanpa melalui pengolahan. Oleh karena itu, diperlukan suatu sistem pengolahan limbah cuci piring untuk menghilangkan kandungan berbahaya di dalamnya. Pada penelitian ini, dilakukan sistem pengolahan limbah cuci piring dengan aerobic suspension culture yang dapat mendegradasi kandungan organik pada limbah untuk menghasilkan effluen dengan kualitas sesuai baku mutu lingkungan. Penelitian ini menggunakan 4 macam bioreaktor yang masing-masing mengandung limbah murni dengan konsentrasi sabun yang berbeda-beda. Bioreaktor diaklimatisasikan terlebih dahulu dengan menggunakan limbah sintetik untuk menumbuhkan activated sludge sampai beratnya 580-860 miligram/L. Setelah aklimatisasi, sampel limbah yang telah diperoleh pada setiap waktu kemudian diuji dengan berbagai parameter. Nilai parameter COD, sCOD, amonia, dan MBAS setiap jenis bioreaktor mengalami penurunan seiring berjalannya waktu selama 48 jam. Sementara itu, hasil analisis parameter TS dan TVS mengalami kenaikan seiring berjalannya waktu selama 48 jam. Kadar DO cairan dalam bioreaktor berada pada range 4,2-7,7 mg/L dan nilai pH berada di range 7,82 – 8,75. Selain itu, pada penelitian ini juga didapatkan nilai parameter kinetika dari bakteri, yaitu µm dan Ks.

Biodegradasi Limbah Cuci Mobil dengan Aerobic Suspension Culture pada Berbagai Konsentrasi Sabun Aqiela Mahannada; Aswati Mindaryani
Indonesian Journal of Energy and Mineral Vol. 2 No. 2 (2022): Indonesian Journal of Energy & Mineral
Publisher : Politeknik Energi dan Mineral Akamigas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53026/IJoEM/2022/2.2/1015

Di antara beberapa jenis limbah, limbah cuci mobil merupakan salah satu limbah yang sangat terkontaminasi dengan pengotor dan kandungan kimia yang cukup tinggi. Untuk memenuhi baku mutu limbah cair, pengolahan limbah cuci mobil ini perlu diperhatikan. Pada penelitian ini, dila-kukan sistem pengolahan limbah hasil cuci mobil dengan sistem aerob menggunakan activated sludge, ditujukan untuk menghasilkan effluen yang baik dan aman bagi lingkungan. Digunakan 4 bioreaktor dengan variasi konsentrasi sabun, yaitu bioreaktor yang berisi limbah cuci mobil mur-ni sebanyak 4L, serta bioreaktor berisi limbah murni dengan tambahan sabun cuci mobil 2 mL, 4 mL, dan 8 mL Bakteri diaklimatisasikan terlebih dahulu sampai massa dari activated sludge adalah 570-670 mg/L. Setelah bakteri tumbuh dan stabil, limbah cair hasil cuci mobil ditambahkan untuk menggantikan substrat. Sampel limbah diambil pada waktu 0;0,5;1;2;4;6;24;dan 48 jam. Dari penelitian ini didapat nilai COD removal hingga 67,79% dan sCOD removal hingga 67,89%. Nilai parameter TS dan TVS mengalami peningkatan akibat pertumbuhan bakteri. Nilai amonia dan surfaktan removal terbaik didapatkan 18,30% dan 69,57%. Nilai pH masih dalam rentang normal (8,07-8,65), dan DO cukup tinggi pada kisaran 6,8-7,5 mg/L. Selain itu, pada penelitian ini juga didapatkan nilai parameter kinetika bakteri setiap bioreaktor, yaitu µm dan Ks.

Community Empowerment through Sustainable Utilisation of Mangrove Forests for the Production of Natural Dyes with an Environmentally Friendly System (Phase I: Increasing Awareness and Knowledge Enhancement) Dwi Tyaningsih Adriyanti; Tri Winarni Soenarto Putri; Aswati Mindaryani; Agus Prasetya; Himawan Tri Bayu Murti Petrus
Jurnal Pengabdian kepada Masyarakat (Indonesian Journal of Community Engagement) Vol 9, No 1 (2023): March
Publisher : Direktorat Pengabdian kepada Masyarakat Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpkm.70455

Community participation in mangrove forest ecosystem conservation is an effort to overcome and avoid mangrove ecosystem deterioration. The findings show that mangrove forests in Kampung Laut’s coastal region, particularly in the village of Ujung Alang, are still well preserved due to diverse mangrove planting efforts. Currently, the community uses mangrove plants by converting some plant sections into food and using the plant’s stems as building materials. Efforts have been made to preserve mangrove forest ecosystems through the Sustainable Utilisation of Mangrove Forests for the Production of Natural Dyes with a Zero Waste System. The following are the activities: 1) Dissemination of the concept to raise public awareness of the potential of mangrove plants as a source of raw materials for natural dyes to increase community income and sustainably manage mangrove forests, 2) Raising the awareness of the younger generation to improve the local economy through the development of micro-scale SMEs in the field of mangrove-based natural dyes, and 3) Technical training on thinning/logging and sustainable mangrove planting to acquaint participants with the concepts of thinning/logging and sustainable man Establish the program’s purpose, which should be divided into six activities. Many farmer groups anticipate that this community service under the auspices of Krida Wana Lestari will assist them in improving their existing products and estimating the potential process of their natural mangroves. This program raises public awareness of the mangrove plant’s potential as a source of raw materials for natural colours. In addition, this activity enables the community to do technical logging and sustainable mangrove planting to support the availability of raw materials for natural dyes. Consequently, the creation and development of a local economic business unit with a green entrepreneurship incubator model based on mangrove conservation and zero waste from natural dye SMEs have begun.

Pengawetan Ekstrak Pewarna Alami dari Daun dan Kulit Buah Kakao (Theobroma cacao L.) Veni Tri Agustin; Edia Rahayuningsih; Aswati Mindaryani
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

Indonesia has abundant natural resources that are very potential and prospective as raw materials for natural dyes, one of which is the leaves and skins of cocoa pods (Theobroma cacao L.). The purpose of this study is to determine the concentration of preservatives that can effectively inhibit the biodegradation reaction of natural dyes in the extract of leaves and skins of cocoa pods. Extracts of natural dyes that have been centrifuged and preservatives was added, then stored in a closed reactor. The preservatives used are benzoic acid and chitosan. Extraction is carried out for 20 days. Every 2 days, extract was analyzed from the reactor to determine the colorant concentration using gravimetric method. Besides benzoic acid, the same experiments was also carried out on another chitosan dissolved in 2% acetic acid solution. The results showed that the addition of benzoic acid and chitosan dissolved in 2% acetic acid solution can inhibit the biodegradation of leaves and skins of cocoa pods extract. Preservative concentrations of 0.50% benzoic acid and 0.25% chitosan are effective preservatives to inhibit the biodegradation reaction

Co-Authors Adriyanti, Dwi Tyaningsih Agus Prasetya Anies Mutiari Aqiela Mahannada Benny Arif Pambudiarto Boma W. Tyoso Bostang Radjagukguk Deendarlianto Divita Hayyu Kinanthi Edia Rahayuningsih Edia Rahayuningsih Francisca Larasati Handrian Handrian Himawan Tri Bayu Murti Petrus Imam Prasetyo Mukti Mukti Muntari, Anies Murni Handayani Muslikhin Hidayat Ningrum, Sari Sekar Nur Indah Fajar Mukti Pambudiarto, Benny Arif Rochmadi Rochmadi Supranto Supranto Surasno . Syafrima Wahyu Tri Winarni Soenarto Putri Veni Tri Agustin Wahyudi B. Sediawan Wahyudi Budi Sediawan Wiratni . Wiratni Budhijanto Wiratni Wiratni Yuni Kusumastuti

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