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All Journal Journal of Degraded and Mining Lands Management Jurnal Teknik Kimia Indonesia
S Setiadi, S
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering

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Pengaruh konfigurasi liquid jet flow kolom gelembung terhadap kemampuan absorpsi gas karbondioksida Setiadi, S; Supramono, Dijan; Istiqomah, Nur
Jurnal Teknik Kimia Indonesia Vol 9, No 2 (2010)
Publisher : ASOSIASI PENDIDIKAN TINGGI TEKNIK KIMIA INDONESIA (APTEKIM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jtki.2010.9.2.1

Abstract

Efforts to improve the performance of CO2 absorption using bubbling columns and liquid jet flow have consistently been developed. The advantage of the present column is the presence of gas entrainment by suction of nozzle and the gas dispersed throughout the bulk of liquid by the formation of bubble clouds. The selection of liquid jet flow configuration used parameters of nozzle position and liquid jet inclination. The configurations have been examined by hydrodynamic test by measuring the ratio of volumetric rate of gas to that of liquid exiting nozzle (QG/QL) and gas holdup. Absorption test to the best configuration used NaOH solution with flowrate of 5 litres/min at atmospheric pressure and CO2 gas feed of 96.6%. The results showed that the configurations of liquid jet flow gave significant effect on hydrodynamics and that the best configurations had gas hold-up in the range of 0.55-0.6 and QG/QL 1.3-1.8. Absorption tests showed that CO2 concentration can be reduced into 0.01%-0.07% in less than five minutes and the absorption should proceed with the chemical reaction up to 10 minutes with no indication of CO2 desorption. The bubbles were generated in the column predominantly in the diameter range of 0.00097-0.00184 mm.Keywords: Configurations of liquid jet, bubble column, gas entrainment, CO2 gas absorption AbstrakUpaya meningkatkan kinerja absorpsi gas CO2 yang memanfaatkan kolom gelembung dan liquid jet flow telah banyak dilakukan. Keunggulan kolom gelembung dalam riset ini adalah kolom menyebabkan gas entrainment (pengisapan gas) dan dispersi gas ke dalam cairan yang membentuk awan gelembung. Pemilihan konfigurasi liquid jet flow terbaik berdasarkan posisi nosel dan arah sudut tembakannya dan dengan mengukur rasio laju volumetrik aliran gas entrainment terhadap laju volumetrik aliran cairan (QG/QL) serta gas hold-up untuk setiap konfigurasi. Konfigurasi terbaik digunakan untuk menentukan kinerja kolom gelembung untuk mendapatkan kinerja kemampuan absorpsi yang setinggi-tingginya. Uji absorpsi dilakukan terhadap konfigurasi terbaik dengan menggunakan absorben larutan NaOH dengan laju alir 5 L/min pada tekanan atmosferik dan umpan gas CO2 dengan kadar 96,6%. Hasil penelitian menunjukkan bahwa konfigurasi memberikan pengaruh cukup signifikan dan bahwa konfigurasi terbaik memberikan gas hold-up kisaran 0,55-0,65 dan rasio QG/QL bernilai 1,3-1,8. Uji absorpsi menunjukkan berkurangnya kadar CO2 menjadi 0,01% hingga 0,07% setelah absorpsi kurang dari 5 menit dan tetap tidak berubah sampai 10 menit. Hal ini menandakan bahwa absorpsi terjadi secara kimiawi antara gas CO2 dan NaOH and tidak terjadi desorpsi walaupun kolom gelembung tetap resirkulasi. Populasi gelembung menunjukkan distribusi ukuran gelembung lebih dominan pada rentang diameter antara 0,00097-0,00184 mm.Kata Kunci: Konfigurasi liquid jet, kolom gelembung, gas entrainment, absorpsi gas CO2
Analysis of the factors affecting the poverty in rural areas around gold mine areas in West Sumbawa Regency Ibrahim, I; Baiquni, M; Ritohardoyo, S; Setiadi, S
Journal of Degraded and Mining Lands Management Vol. 3 No. 3 (2016)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2016.033.585

Abstract

West Sumbawa Regencyis one of the regencies that are rich of natural resources managed by PT. Newmont Nusa Tenggara. However, local communities around the gold mine areas have generally to date been poor. This study was aimed to (1) examine the effect of material poverty, physical weakness, isolation, vulnerability, and powerlessness on poverty, and (2) describe the distribution of rural povertybased on land slope mapsin gold mine areas in West Sumbawa Regency.This study applied a survey technique, observation, and structured interviews to collect data. The processing and analysis of data was carried out by a quantitative method using a multiple regression analysis. The results of the study showed that the factors significantly affecting the poverty among rural communities around gold mine areas were material poverty, physical weakness, isolation, vulnerability and powerlessness (R2 = 0.715). However, the mostly dominant factor affecting the poverty was powerlessness (t = 19.715). Meanwhile, the distribution of poverty based on topographic sites showed that the poverty occurred in villages with plain topography (Goa Village), terrain topography (Maluk Village), wave topography (Belo Village), and hilly topography (Sekongkang Bawah Village). The poverties occurred in all the villages were mostly affected by powerlessness with t values of 3.489, 13.921, 11.828, and 6.504, respectively. This condition was due to minimum access and communication by local communities to local government and the gold mining company of PT. Newmont Nusa Tenggara
The economic activities analysis of the marginal community living around the artisanal oil mining site in Hargomulyo, Bojonegoro Regency Brata, N T; Sairin, S; Setiadi, S
Journal of Degraded and Mining Lands Management Vol. 4 No. 2 (2017)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2017.042.733

Abstract

The focus of this paper is on a marginal society in Bojonegoro Regency, East Java Province. It is a remote area in the middle of a teak forest, far away from the centre of economy and governance, it’s that makes the society find some difficulties to overcome their economic problems. There are some oil wells owned by NV BPM Company which had stopped its legal operations. Then, the society conducts illegal traditional oil mining. The purposes of this study are: (1) to study the reason of the society in making the artisanal oil mining as their livelihood, (2) to study the economic implication from their mining activities. The results showed that in a tough life to fulfil their needs, there is a creative idea from the society in seeing and understanding their infertile environment. In an environment that looks unable to provide a chance to the society for getting a livelihood, there are some people find a niche in the form of old oil wells. The society is able to find an environment niche to resolve their poverty problems. The economic implication is in the form of chance or entrance for the society to work in Artisanal Oil Mining (AOM) field. 
Co-Authors Brata, N T Dijan Supramono I Ibrahim, I M Baiquni Nur Istiqomah S Ritohardoyo, S Sairin, S