リン回収を伴う下水汚泥の超臨界水ガス化

内容の要約広島大学(Hiroshima University)博士(工学)Doctor of Engineeringdoctora

Insights into the behavior and kinetics of purun tikus degradation during slow pyrolysis

Purun tikus (Elocharis dulcis), a type of wetland biomass feedstock, is a challenge to the swamp ecosystem as it contributes to pollution in the area. Hence, integrating the use of purun tikus as a source of bioenergy, particularly in the form of bio-oil, is of the highest priority. Nevertheless, there is a lack of research on the degradation rate of purun tikus conversion to bio-oil through pyrolysis. Thus, this study aims to evaluate the rate of destruction of purun tikus in the process of conversion into bio-oil via pyrolysis. In the experiment, a batch reaction vessel was used to carry out slow pyrolysis at temperatures ranging from 300 to 500 °C, and the reaction times ranged from 60 to 120 min. By assuming a first-order process and using the Arrhenius equation, it was possible to figure out the activation energy and the preexponential factort. To determine whether purun tikus destroyed during pyrolysis, an activation energy of 43.317 kJ mol-1 and a pre-exponential factor of 0.351 s-1 were identified

Pengaruh Bahan Bakar LPG Sistem Manifold Injeksi Terhadap Performa Single Cylinder Spark Ignition Engine

Penelitian ini merupakan penelitian lanjutan dari penelitian sebelumnya. Konversi dari bahan bakar minyak ke bahan bakar gas jenis LPG (Liquified Petroleum Gas) dengan menggunakan sistem injeksi tipe 1. Sistem injeksi tipe I atau disebut dengan manifold injection merupakan desain injeksi yang paling sederhana pengganti sistem karburator, dimana sistem ini diharapkan mampu memperbaiki pasokan bahan bakar yang dibutuhkan oleh mesin. Torsi dan daya mesin diperoleh dengan menggunakan peralatan chasis dynamometer. Bahan bakar yang digunakan dalam penelitian ini yaitu menggunakan bahan bakar minyak jensi premium dan bahan bakar gas jenis LPG. Hasilnya menunjukkan bahwa dengan menggunakan bahan bakar LPG injeksi tipe 1, terjadi penurunan torsi, daya mesin, dan spesifik konsumsi bahan bakar pada single cylinder spark ignition. Akan tetapi efisiensi thermal meningkat sebesar 6,38% dibandingkan dengan bahan bakar premium

Studi Kinerja Picohydro Turbine Low Power Pada Saluran Irigasi Budidaya Ikan Desa Bincau Kecamatan Martapura Kabupaten Banjar

Salah satu sumber energi baru terbarukan yang memiliki potensi untuk dikembangkan yaitu pemanfaatan energi air sebagai pembangkit listrik. Implementasi dari Pembangkit Tenaga Listrik Pikohidro sangat cocok dengan wilayah alam yang berada di Kalimantan Selatan yang banyak memiliki aliran air, seperti sungai, irigasi, air terjun, bendungan dan lainnya. Sebuah pengembangan tentang Pembangkit Listrik Tenaga Pikohidro diperlukan untuk implementasi di wilayah terpencil Kalimantan Selatan yang energinya dapat menerangi irigasi pada malam hari ataupun kebutuhan sehari-hari. Penelitian ini bertujuan untuk mengetahui performa Pembangkit Listrik Tenaga Pikohidro Archimedes Screw dengan menggunakan debit andalan irigasi Instalasi Buididaya Ikan Desa Bincau. Hasil pengujian dengan debit 47,88 ltr/dtk, dengan Level Rendaman (I) 0,7 serta Kemiringan 11° menghasilkan Putaran diangka 301 rpm dengan Torsi (? ) sebesar 2,82 Nm

UJI EKSPERIMENTAL SEMEN PAPAN PARTIKEL BERBAHAN BAKU LIMBAH FLY ASH BATU APUNG SEBAGAI BAHAN PEREDAM SUARA

By the development in technology especially in architecture and industry with its noise activity, encourage us to do some efforts to solve noise problem. One might done is utilize pumice as noise absorber. Raw material used in this reaserch is pumice ash. Mixing compotsition variation between cement composition, pumice ash as sand subtitution, with comparison mixing composition at 1 : 6 (1 cemen : 6 ash), 1 : 8 (1 cement : 8 ash :), 1 : 10 (1 cement : 10 ash). Sound absorbtion coefisien are measured by standing wave tube apparatus. The result of the research indicates that mixing composition affects the sound absorbtion coefisien. Reaserch shows taht 1 : 6, 1 :8 and 1 : 10 sound absorbtion coefisien which is 0.96, 0,86 and 0.89 in 8000 Hz frequency. Comparison at 1 : 6, 1 : 8 and 1 : 10 (cement : sand ) has the best absorbtion coefisien at comparation 1 : 10 which is 0.98 with 4000 Hz frequency (middle level frequency)

Effect of Discharge Variation on the Performance of Single Blade Archimedes Screw Turbine: Prediction with Computational Fluid Dynamic

Constructing a small-scale hydroelectric power station that can run efficiently at a head lower than 10 m is one possible method for reducing the impact of the electricity crisis in remote areas of Indonesia. The Archimedes Screw turbine is one type of turbine that is ideal for discharges below 10 m.  In this study, the simulation results show that the value of Turbulences Kinetic Energy is directly proportional to the increase in flow rate but inversely proportional to the level of immersion. This type of turbine is unless well in Indonesia due to a lack of information regarding the application of low head power plants. The turbine model that is suitable for the low head is investigated in this study. Before being tested, the turbine is first designed theoretically and then numerically evaluated. With discharges of 1 l/s, 2 l/s, and 3 l/s and turbine immersion levels of 30%, 50%, and 70%, ANSYS CFD (Computational Fluid Dynamic) software was used to investigate flow rate and level of immersion in the turbine. According to the investigation findings, the discharge has a considerable impact on the turbine's movement; the higher the flow rate, the higher the power to the turbine, which produces a torque on the turbine. The simulation findings indicate that the value of Turbulence Kinetic Energy is proportional to the increase in flow rate but inversely proportional to the level of immersio

Slow Pyrolysis of Ulva lactuca (Chlorophyta) for Sustainable Production of Bio-Oil and Biochar

Ulva Lactuca is a fast-growing algae that can be utilized as a bioenergy source. However, the direct utilization of U. lactuca for energy applications still remains challenging due to its high moisture and inorganics content. Therefore, thermochemical processing such as slow pyrolysis to produce valuable added products, namely bio-oil and biochar, is needed. This study aims to conduct a thorough investigation of bio-oil and biochar production from U. lactuca to provide valuable data for its further valorization. A slow pyrolysis of U. lactuca was conducted in a batch-type reactor at a temperature range of 400–600 °C and times of 10–50 min. The results showed that significant compounds obtained in U. lactuca’s bio-oil are carboxylic acids (22.63–35.28%), phenolics (9.73–31.89%), amines/amides (15.33–23.31%), and N-aromatic compounds (14.04–15.68%). The ultimate analysis revealed that biochar’s H/C and O/C atomic ratios were lower than feedstock, confirming that dehydration and decarboxylation reactions occurred throughout the pyrolysis. Additionally, biochar exhibited calorific values in the range of 19.94–21.61 MJ kg−1, which is potential to be used as a solid renewable fuel. The surface morphological analysis by scanning electron microscope (SEM) showed a larger surface area in U. lactuca’s biochar than in the algal feedstock. Overall, this finding provides insight on the valorization of U. lactuca for value-added chemicals, i.e., biofuels and biochar, which can be further utilized for other applications

Slow Pyrolysis of <i>Ulva lactuca</i> (Chlorophyta) for Sustainable Production of Bio-Oil and Biochar

Ulva Lactuca is a fast-growing algae that can be utilized as a bioenergy source. However, the direct utilization of U. lactuca for energy applications still remains challenging due to its high moisture and inorganics content. Therefore, thermochemical processing such as slow pyrolysis to produce valuable added products, namely bio-oil and biochar, is needed. This study aims to conduct a thorough investigation of bio-oil and biochar production from U. lactuca to provide valuable data for its further valorization. A slow pyrolysis of U. lactuca was conducted in a batch-type reactor at a temperature range of 400–600 °C and times of 10–50 min. The results showed that significant compounds obtained in U. lactuca’s bio-oil are carboxylic acids (22.63–35.28%), phenolics (9.73–31.89%), amines/amides (15.33–23.31%), and N-aromatic compounds (14.04–15.68%). The ultimate analysis revealed that biochar’s H/C and O/C atomic ratios were lower than feedstock, confirming that dehydration and decarboxylation reactions occurred throughout the pyrolysis. Additionally, biochar exhibited calorific values in the range of 19.94–21.61 MJ kg−1, which is potential to be used as a solid renewable fuel. The surface morphological analysis by scanning electron microscope (SEM) showed a larger surface area in U. lactuca’s biochar than in the algal feedstock. Overall, this finding provides insight on the valorization of U. lactuca for value-added chemicals, i.e., biofuels and biochar, which can be further utilized for other applications