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The Analysis of Pollutant Parameters in Tofu Wastewater after being Treated by Contact Glow Discharge Electrolysis Widya Pangestika; Nelson Saksono

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/jip.v9i1.7492


Background and Objective: There are many Small, Micro and Medium Enterprises engaged in tofu processing in Indonesia. Some of them still dumped their waste directly into the river, causing the river to become turbid, had bad odor, and many aquatic organisms in the water died. Tofu wastewater contained high pollutant parameters, such as: COD, BOD, TOC, and TSS therefore, we need an effective wastewater treatment that could reduce the level of these parameters to below the standards set by the government. Materials and Methods: We used Contact Glow Discharge Electrolysis (CGDE) to treat the wastewater. Besides these four parameters, we also measured pH solution at several CGDE process voltage variations and analyzed the content of compounds contained in the initial tofu wastewater and the waste that had been treated by using CGDE. Results: From this study, we knew that the higher the voltage we used, the more acidic the solution would become. In the same operating condition, the percentage of TOC degradation was lower than the percentage of COD degradation. Voltage of 750 V gave the lowest COD and TOC values, respectively 446.6 mg/L and 320 mg/L. In addition, the best voltage that could reduce BOD and TSS degradation by 37% and by 80.2% respectively, was 650 V. Conclusion: CGDE process was able to degrade complex compounds in tofu wastewater into compounds with simpler molecular structures, such as Tris (2,4-di-tert-butylphenyl) phosphate and eicosane.
Efek Suhu dan Injeksi Udara pada Penyisihan Limbah Pewarna Tekstil Remazol Red dengan Metode Elektrolisis Plasma Tri S. Budikania; Dian R. Suminar; Eva F. Karamah; Nelson Saksono
Jurnal Teknik Kimia Indonesia Vol 18, No 1 (2019)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jtki.2019.18.1.5


Abstrak. Limbah pewarna industri tekstil merupakan limbah cair yang sulit teroksidasi dan berbahaya bagi lingkungan. Radikal hidroksil (•OH) merupakan spesies yang sangat efektif dalam mengoksidasi berbagai limbah cair organik seperti limbah pewarna.  Metode Elektrolisis Plasma sangat produktif menghasilkan radikal Hidroksil sehingga efektif dalam menyisihkan (mendegradasi) berbagai jenis limbah pewarna tekstil seperti Remazol Red. Penelitian ini bertujuan mengoptimalkan proses degradasi remazol red RB 133 dan konsumsi energinya menggunakan metode Elektrolisis Plasma melalui pengaturan suhu dan  injeksi gelembung  udara dalam larutan. Pembentukan H2O2 merupakan indikator pembentukan •OH pada reaksi Elektrolisis Plasma. Injeksi udara pada larutan limbah pewarna menurunkan arus listrik pada kurva karekateristik arus-tegangan. Kenaikan suhu larutan dari 45 oC menjadi 75 oC  selama 10 menit reaksi tampa injeksi udara menurunkan konsumsi energi  dari 229,9 kJ menjadi 219,5 kJ serta menurunkan  produksi H2O2 dari 4,8 mmol menjadi 3,1 mmol. Sementara injeksi udara pada suhu 75 oC selama 10 menit proses menurunkan konsumsi  listrik hingga 28,5% dan meningkatkan produksi H2O2 hingga 27,3 %. Namun demikian injeksi udara hanya meningkatkan degradasi Remazol Red sebesar 1,8 %.  Suhu optimum dicapai pada 55oC, dengan produksi H2O2 sebesar 5,7 mmol selama 30 menit. Injeksi udara udara mampu meningkatkan efektivitas proses. Hasil penelitian menunjukkan persen penyisihan mencapai 88,9% dengan  konsumsi energi sebesar 115,2 kJ dalam waktu 30 menit reaksi. Kata kunci: elektrolisis plasma, remazol red, gelembung udara. Abstract. Effect of Temperature and Air Injection on Degradation of Remazol Red Textile Dyes by Plasma Electrolysis Method. The textile dye waste is a liquid waste that is difficult to oxidize and dangerous for the environment. Hydroxyl radicals (• OH) are very effective species in oxidizing various organic liquid wastes such as Remazol Red. Plasma Electrolysis Method is very productive in producing Hydroxyl radicals, resulting in effective degradation of various types of textile dye waste such as Remazol Red. This study aims to optimize the degradation process of remazol red RB 133 and its energy consumption using the Plasma Electrolysis method through temperature regulation and injection of air bubbles in solution. The formation of H2O2 is used an indicator of the formation of •OH in the Plasma Electrolysis reaction. The Air injection decreases the electric current on the current-voltage characteristic curve. The solution temperature increases from 45oC to 75oC for 10 minutes reaction without air injection were able to reduce the energy consumption from 229.9 kJ to 219.5 kJ and H2O2 production from 4.8 mmol to 3.1 mmol. Meanwhile, the addition of air injection at 75oC within 10 minutes of reaction were able to reduce electricity consumption by 28.5% and increases H2O2 production by 27.3%. However, the addition of air injection only increased the degradation of Remazol Red by 1.8%. The optimum temperature was reached at 55oC, with H2O2 production of 5.7 mmol for 30 minutes. The addition of air injection has been shown to increase the effectiveness of the process. The results showed degradation percentage reached 88.9% with energy consumption of 115.2 kJ within 30 minutes of reaction. Keywords: air injection, plasma electrolysis, remazol red. Graphical Abstract
Analisis dan Optimasi Pengaruh Suhu Gas Umpan Pada Kinerja Acid Gas Removal Unit Iwan Febrianto; Nelson Saksono
Proceedings Series on Physical & Formal Sciences Vol. 1 (2021): Proceedings of Smart Advancement on Engineering and Applied Science
Publisher : UM Purwokerto Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (608.721 KB) | DOI: 10.30595/pspfs.v1i.136


The Gas Gathering Station (GGS) in field X processes gas from 16 (sixteen) wells before being sent as selling gas to consumers. The sixteen wells have decreased in good pressure since 2011, thus affecting the performance of the Acid Gas Removal Unit (AGRU). The GGS consists of 4 (four) main units, namely the Manifold Production/ Test, the Separation Unit, the Acid Gas Removal Unit (AGRU), the Dehydration Unit (DHU). The AGRU facility in field X is designed to reduce the acid gas content of CO2 by 21 mol% with a feed gas capacity of 85 MMSCFD. A decrease in reservoir pressure caused an increase in the feed gas temperature and an increase in the water content of the well. Based on the reconstruction of the design conditions into the simulation model, the amine composition consisting of MDEA 0.3618 and MEA 0.088 wt fraction to obtain the percentage of CO2 in the 5% mol sales gas. The increase in feed gas temperature up to 146 F caused foaming due to condensation of heavy hydrocarbon fraction, so it was necessary to modify it by adding a chiller to cool the feed gas to become 60 F. Based on the simulation, the flow rate of gas entering AGRU could reach 83.7 MMSCFD. There was an increase in gas production of 38.1 MMSCFD and condensate of 1,376 BPD. Economically, the addition of a chiller modification project was feasible with the economical parameters of NPV US$ 132,000,000, IRR 348.19%, POT 0.31 year and PV ratio 19.06.
Techno Economic of CNG & GTG Technology Applied in Gas Flare Management Dicgorry Nafiscatoha; Nelson Saksono
Proceeding ISETH (International Summit on Science, Technology, and Humanity) 2019: Proceeding ISETH (International Summit on Science, Technology, and Humanity)
Publisher : Universitas Muhammadiyah Surakarta

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Our environment is being endangered by greenhouse gases from gas flaring processes. Approximately 4 mmscfd is contributed by flare gas from JWB field. The flare gas would be concentrated to become the most economic value and prevent the greenhouse effect. The analysis of economic value is getting the fastest investment return and the most annual profit. This Study would discuss a techno-economic aspect of flare gas utilization technology. In this paper, two methods of compressed natural gas (CNG) and gas to wire (GTW) was combined with CNG would be introduced and applied in this field. For both methods are introduced and compared to the best method from an economic standpoint identified. According to the results, the production of the CNG method of flare gas utilization is the most economical technology; with has a greater ROR, an annual profit of about $3.65 million, and a payback period of 2.09 years. Economic analysis shows there improved gas flare value and improvement environmental protection.