Polutan yang terdapat di udara, khususnya gas buang yang berasal dari sisa-sisa pembakaran, salah satunya mengandung unsur Oksida Nitrogen (NOx). Dimana gas tersebut dapat menyebabkan kerusakan pada lapisan ozon, menghasilkan efek rumah kaca, hujan asam dan kabut fotokimia. Untuk mengatasi agar kandungan gas tersebut tidak mengakibatkan pencemaran udara yang berlebih, perlu dilakukan penelitian untuk menurunkan kadar emisi gas NOx. Eksperimen ini bertujuan untuk mengeliminasi NOx dari udara melalui penyerapan menggunakan campuran larutan H2O2 dan HNO3 sebagai penyerap dalam modul membran. Proses absorpsi berlangsung dengan mempertemukan gas NOx dengan absorben yang merupakan campuran oksidator yaitu H2O2 dan HNO3 . Variabel independen yang diuji adalah laju aliran gas NOx antara 100 mL/mnt, 125 mL/mnt, 150 mL/mnt, 175 mL/mnt dan 200 mL/mnt dengan konsentrasi gas NOx 600 ppm dan variasi H2O2 (0,5%, 5%, 10% wt) dengan campuran 0,5 M HNO3. Nilai efisiensi penghilangan NOx tertinggi, koefisien perpindahan massa, fluks dan NOx Loading yang dicapai dalam percobaan adalah 95,61%, 9,6x10-8 mmol/cm2 , 1,3x10-2 cm/s, 9x10-3. Semua jenis aliran gas ialah turbulen berdasarkan nilai b trendline bilangan Reynold yang didapatkan yaitu 0,9542 ; 0,9608 ; 0,9419.
Pollutants found in the air, especially exhaust gases from combustion residues, one of which contains Nitrogen Oxide (NOx). Where gas can cause damage to the ozone layer, resulting in a greenhouse effect, acid rain and photochemical fog. To overcome the problems, it necessary to conduct a research to reduce the level of NOx gas emissions. This experiment aims to eliminate NOx from the air through absorption using a mixture of H2O2 and HNO3 solutions as absorbers in the membrane module. The absorption process takes place by combining NOx gas with absorbent which is a mixture of oxidizers namely H2O2 and HNO3. The experiment started with the absorbent were at static phase inside shell of membrane while the feed gas flowing inside the tube of membrane. The independent variables tested were NOx gas flow rate between 100 mL/min, 125 mL/min, 150 mL/min, 175 mL/min and 200 mL/min with NOx gas concentration of 600 ppm and H2O2 variation (0,5%, 5%, 10% wt) reacted with 0,5 M HNO3. The highest values of NOx removal efficiency, mass transfer coefficient, flux and NOx Loading achieved in the experiment were 95.61%, 9.6x10-8 mmol/cm2 , 1.3x10-2 cm/s, 9x10-3 respectively. All gas flow types based on the Reynold value obtained are 0.9542, 0.9608, 0.9419.
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The gas is an energy transition that can reduce carbon emissions cause its climate change. Implementation of energy transition by plan of gas field development (POFD). The Natuna D Alpha Field with 71% of CO2 content and 28% of CH4 content. It is necessary to study upgrading natural gas specification in accordance with the sales gas specifications. Natuna D Alpha development study using Techno-Economics method. For technical aspect, we design polymer membrane technology with Polysulfone into Python then input to unisim. Membrane technology is to separate CO2 from natural gas. Furthermore, CO2 captured will re inject to subsurface as the implementation of carbon capture storage & utilization through estimating CO2 storage capacity for sequestration and enhanced gas recovery . Meanwhile, the economic aspect is to determine project feasibility using a production sharing contract cost recovery scheme, whose are the Government and the Contractor. The result is 95,02% of CH4 content with 4,89% of CO2 content. It needs investment cost of 5.451.869 MUSD. Based on the economic aspect Natuna D Alpha gas field development can proceed to the execution stage that determined net present value (NPV) of USD 24,960 million then IRR is about 13,84%, Payback Period (PBP) in 7,05 year.
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