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<![CDATA[Metode-Metode Pengurangan Residu Pestisida pada Hasil Pertanian ]]>
<![CDATA[Bayu Refindra Fitriadi]]>;
<![CDATA[Ayutia Ciptaningtyas Putri]]>
<![CDATA[ Jurnal Rekayasa Kimia & Lingkungan Vol 11, No 2 (2016): Jurnal Rekayasa Kimia & Lingkungan ]]>
Publisher : <![CDATA[Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia ]]>
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DOI: 10.23955/rkl.v11i2.4950
<![CDATA[Penggunaan pestisida yang luas pada setiap tahap tanaman di Indonesia menyebabkan banyak residu pestisida yang tertinggal pada hasil pertanian maupun pada lingkungan pertanian. Residu pestisida yang terdapat pada hasil pertanian mempunyai dampak yang buruk bagi kesehatan manusia dan lingkungan. Berbagai macam metode telah dikembangkan untuk mengurangi residu pestisida yang terdapat pada hasil pertanian, baik pada tahap prapanen maupun pada tahap pasca panen. Metode prapanen meliputi penggunaan Agen Pengendali Hayati dan sistem pertanian Pengendalian Hama Terpadu, penggunaan pestisida non persisten, pengaturan waktu aplikasi pestisida, dan penggunaan arang aktif. Sedangkan metode pasca panen meliputi pencucian hasil pertanian, penggunaan ozon dan air terozonisasi, perendaman air panas, penggunaan radiasi ultrasonik dan pengaturan pH. Metode prapanen maupun pasca panen sama baiknya dalam menurunkan kadar residu pestisida pada hasil pertanian dengan memberikan hasil signifikan pengurangan residu pestisida antara 50 - 100%.]]>
<![CDATA[Adsorpsi Ion Logam Cu(II) Menggunakan Lignin dari Limbah Serbuk Kayu Gergaji ]]>
<![CDATA[Lelifajri Lelifajri]]>
<![CDATA[ Jurnal Rekayasa Kimia & Lingkungan Vol 7, No 3 (2010): Jurnal Rekayasa Kimia & Lingkungan ]]>
Publisher : <![CDATA[Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia ]]>
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<![CDATA[Adsorption of heavy metal ion Cu(II) onto modified lignin from sawdust waste have been presented. The ability of lignin from sawdust waste to adsorb the copper ion has been evaluated by varying adsorption time, pH of solution, and adsorption capacity. The concentration of copper ion was measured by atomic adsorption spectrometer. The result showed that the optimum condition of ion Cu(II) by lignin were achieved at adsorption time of 15 minutes, pH of solution of 6, and copper concentration of 20 mg/L with adsorption efficiency of 99,3 %. In this study, the maximum capacity of 15,43 mg/g and equilibrium constant of 754,96 were achieved.Keywords: adsorpsi, ion tembaga, lignin, limbah serbuk kayu gergaji]]>
<![CDATA[Modifikasi Alat Penyuling Uap untuk Peningkatan Rendemen dan Mutu Minyak Nilam (Pogostemon cablin Benth) ]]>
<![CDATA[Mahlinda Mahlinda]]>;
<![CDATA[Vinno Arifiansyah]]>;
<![CDATA[Muhammad Dani Supardan]]>
<![CDATA[ Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 1 (2019): Jurnal Rekayasa Kimia & Lingkungan (June, 2019) ]]>
Publisher : <![CDATA[Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia ]]>
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DOI: 10.23955/rkl.v14i1.13475
<![CDATA[Penyulingan minyak nilam konvensional umumnya menggunakan peralatan penyulingan sederhana yang memilikii beberapa kekurangan yaitu: waktu proses yang lama, konsumsi energi yang besar dan rendemen minyak yang rendah. Tujuan penelitian ini adalah melakukan modifikasi alat penyuling uap untuk peningkatkan rendemen dan mutu minyak nilam yang dihasilkan. Modifikasi yang dilakukan adalah: penambahan pipa api pada boiler, pengaturan aliran air yang masuk ke dalam boiler, pemasangan economizer dan penambahan unit pemanas lanjut. Hasil penelitian menunjukkan bahwa dengan penggunaan alat penyuling uap modifikasi dapat menghasilkan rendemen yang lebih tinggi dan waktu proses yang lebih cepat dibandingkan dengan alat penyuling uap konvensional. Hasil analisis gas chomatography-mass spectrometry menunjukkan kandungan patchouli alcohol minyak nilam hasil penyulingan alat modifikasi sebesar 31,96%. Spektra hasil analisis Fourier Transform Infrared menunjukkan minyak nilam hasil penyulingan alat penyuling modifikasi dan konvensional memiliki gugus fungsi yang sama. Namun, warna minyak hasil penyulingan alat penyuling modifikasi lebih gelap dibandingkan alat penyuling konvensional. Hasil pengujian mutu minyak nilam menunjukkan warna, densitas, indeks bias dan putaran optik sudah memenuhi standar SNI No. 062385-1998.]]>
<![CDATA[A Comparative Study of Applying Active-Set and Interior Point Methods in MPC for Controlling Nonlinear pH Process ]]>
<![CDATA[Syam Syafiie]]>;
<![CDATA[Chia Yaw Kwan]]>
<![CDATA[ Jurnal Rekayasa Kimia & Lingkungan Vol 10, No 1 (2014): Jurnal Rekayasa Kimia & Lingkungan ]]>
Publisher : <![CDATA[Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia ]]>
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DOI: 10.23955/rkl.v10i1.2168
<![CDATA[A comparative study of Model Predictive Control (MPC) using active-set method and interior point methods is proposed as a control technique for highly non-linear pH process. The process is a strong acid-strong base system. A strong acid of hydrochloric acid (HCl) and a strong base of sodium hydroxide (NaOH) with the presence of buffer solution sodium bicarbonate (NaHCO3) are used in a neutralization process flowing into reactor. The non-linear pH neutralization model governed in this process is presented by multi-linear models. Performance of both controllers is studied by evaluating its ability of set-point tracking and disturbance-rejection. Besides, the optimization time is compared between these two methods; both MPC shows the similar performance with no overshoot, offset, and oscillation. However, the conventional active-set method gives a shorter control action time for small scale optimization problem compared to MPC using IPM method for pH control.]]>
<![CDATA[Esterification of Free Fatty Acid in Crude Palm Oil Off Grade ]]>
<![CDATA[Muhammad Dani Supardan]]>;
<![CDATA[Satriana Satriana]]>
<![CDATA[ Jurnal Rekayasa Kimia & Lingkungan Vol 7, No 2 (2009): Jurnal Rekayasa Kimia & Lingkungan ]]>
Publisher : <![CDATA[Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia ]]>
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<![CDATA[The esterification of free fatty acids (FFA) found in crude palm oil (CPO) off grade with methanol is a promising technique to convert FFA into valuable fatty acid methyl ester (FAME, biodiesel) and obtain a FFA-free oil that can be further transesterified using alkali bases. In this work, the effects of the main variables involved in the esterification process i.e. alcohol to oil molar ratio, reaction temperature, agitation speed and the initial amount of FFA of oil, were studied in the presence of sulphuric acid as catalyst at concentration of 1%-w. The experimental results show that the esterification process could lead to a practical and cost effective FFA removal unit in front of typical oil transesterification for biodiesel production.Keywords: CPO off grade, esterification, free fatty acid]]>
<![CDATA[Adsorpsi Methyl Violet oleh Karbon Aktif dari Limbah Tempurung Kelapa dengan Aktivator ZnCl2 Menggunakan Pemanasan Gelombang Mikro ]]>
<![CDATA[Widi Astuti]]>;
<![CDATA[Anggelita Dwi Handayani]]>;
<![CDATA[Diah Ayu Wulandari]]>
<![CDATA[ Jurnal Rekayasa Kimia & Lingkungan Vol 13, No 2 (2018): Jurnal Rekayasa Kimia & Lingkungan (December, 2018) ]]>
Publisher : <![CDATA[Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia ]]>
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DOI: 10.23955/rkl.v13i2.11945
<![CDATA[Synthesis of activated carbon from coconut shell waste with ZnCl2 activation using microwave heating have been carried out. Coconut shell consists of 36.51% lignin, 33.61% cellulose and 19.27% hemicellulose which causes it can be used as a precursor in the synthesis of activated carbon. The activated carbon was further characterized using Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectrophotometer (FTIR) and NOVA Gas Sorption Analyzer-Quantachrome and used for the adsorption of methyl violet in aqueous solution with variation of pH, contact time and concentration of solution. The result showed that the pore of activated carbon was larger than that of the char. The optimum adsorption occurred at pH 3 and the equilibrium time was reached after 180 minutes. The Langmuir equilibrium model was more appropriate than the Freundlich equilibrium model. While the kinetics model analyzed using pseudo first order, pseudo second order, internal diffusion and external diffusion indicated that the pseudo second order was most suitable for the adsorption of methyl violet by coconut shell activated carbon.]]>
<![CDATA[Feasibility of In-Situ Aeration of Old Dumping Ground for Land Reclamation ]]>
<![CDATA[Huan-Huan Tong]]>;
<![CDATA[Ke Yin]]>;
<![CDATA[Charles Yong-Han Chia]]>;
<![CDATA[Omar Ahmad]]>;
<![CDATA[Ling Xin]]>;
<![CDATA[Jing-Yuan Wang]]>
<![CDATA[ Jurnal Rekayasa Kimia & Lingkungan Vol 9, No 4 (2013): Jurnal Rekayasa Kimia & Lingkungan ]]>
Publisher : <![CDATA[Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia ]]>
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DOI: 10.23955/rkl.v9i4.1227
<![CDATA[Dumping grounds are characterized by the absence of engineering controls such as base liners and cover layer. Consequently, these dumping grounds present risks for surrounding resources such as soil, groundwater and air. The concern for groundwater contamination by leachate from tropical dumping grounds is heightened due to the greater amounts of rainfall and subsequent infiltration and percolation through the waste mass. The emergent demand for old dumping grounds reclamation drives the need to employ remediation technologies. Generally, in-situ aeration is a remediation method that promotes aerobic conditions in the later stage of dumping ground. It accelerates carbon transfer, reduces remaining organic load, and generally shortens the post closure period. However, high rainfall in tropical areas straitens this technique. For example, pollutants could be easily flushed out and more energy should be required to overcome hydrostatic pressure. Although heavy rainfall could supply sufficient water to the substrate and accelerate degradation of organic matter, it may inhibit aerobic activities due to limited air transfer. The waste characterization from Lorong Halus Dumping Ground (closed dumping ground in Singapore) showed that the waste materials were stabilized after 22 years closure. According to the Waste Acceptance Criteria set by European Communities Council, the waste materials could be classified as inert wastes. One interesting finding was that leachate layer detected was about of 5 - 8 meter depth, which entirely soaked the waste materials. Hence, the reclamation design and operation should be carefully adjusted according to these characters. Lorong Halus Dumping Ground case study can provide a guideline for other tropical closed landfills or dumping grounds.]]>
<![CDATA[Spore Production of Biocontrol Agent Trichoderma Harzianum: Effect of C/N ratio and Glucose Concentration ]]>
<![CDATA[Syahiddin Dahlan Said]]>
<![CDATA[ Jurnal Rekayasa Kimia & Lingkungan Vol 6, No 1 (2007): Jurnal Rekayasa Kimia & Lingkungan ]]>
Publisher : <![CDATA[Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia ]]>
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<![CDATA[Effects of medium condition on spore production and spore viability of Trichoderma harzianum UPM 29 isolated from oil palm rhizosphere were studied. The carbon to nitrogen (CN) ratio and glucose concentration have significant effect on spore production and spore viability of the fungus. Highest spore production (1.6x108spores/ml) was obtained in a medium containing 30 g/l glucose with a CN ratio of 24. The highest spore viability (52.5%) was produced in the culture grown on media with glucose concentration of 30 g/l and with a C/N ratio of 44.Keywords: biocontrol agent, biofungicide, spore viability, Trichoderma harzianum]]>
<![CDATA[Adsorption of Mercury (II) Ions from Water Using Carbon-Based Monolith with Manganese Oxide Filler ]]>
<![CDATA[Debby Widya Kusuma]]>;
<![CDATA[Mahidin Mahidin]]>;
<![CDATA[darmadi darmadi]]>
<![CDATA[ Jurnal Rekayasa Kimia & Lingkungan Vol 17, No 2 (2022): Jurnal Rekayasa Kimia & Lingkungan (July - December, 2022) ]]>
Publisher : <![CDATA[Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia ]]>
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DOI: 10.23955/rkl.v17i2.27747
<![CDATA[Mercury is harmful to humans and the ecological environment. The adsorption process is known as an effective method for removing heavy metals. This research is devoted to developing new adsorbents based on carbon materials to remove metal ions Hg(II) with carbon-based monolith adsorbents without and with manganese oxide fillers (KM and KMM). The results of adsorption efficiency, adsorption kinetics, and isotherm models were made in a batch system with varying concentrations of mercury solution from 2 mg/L to 6 mg/L with adsorbents without and with manganese oxide fillers (KM and KMM). The highest removal efficiency reached 96% on KMM and 47% on KM. The adsorption isotherm of Hg(II) ions corresponds to the Freundlich model, with intensity and volume constants obtained respectively 0.042 and 1.347 L/mg on KM adsorbents, while on KMM adsorbents the intensity and volume constants obtained are 0.291 and 2.079, respectively. L/mg. These results indicate that physical adsorption occurs more dominantly than chemical adsorption. The adsorption of Hg(II) ions was in accordance with the pseudo-first-order adsorption kinetics, with the adsorption capacity and rate constant on the KM adsorbent obtained were 0.0505 mg/g and 0.0072 g/mg, while the adsorption capacity and rate constant for the KMM adsorbent were on KM adsorbents obtained were 0.0848 mg/g and 0.0239 g/mg.]]>
<![CDATA[Fotokatalisis Nanopartikel Magnetis Zinc Ferrite dengan Penyinaran Cahaya UV dan Cahaya Tampak ]]>
<![CDATA[Iis Nurhasanah]]>;
<![CDATA[Priyono Priyono]]>;
<![CDATA[Karnaji Karnaji]]>;
<![CDATA[Very Richardina]]>
<![CDATA[ Jurnal Rekayasa Kimia & Lingkungan Vol 13, No 1 (2018): Jurnal Rekayasa Kimia & Lingkungan (June, 2018) ]]>
Publisher : <![CDATA[Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia ]]>
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DOI: 10.23955/rkl.v13i1.9953
<![CDATA[Nanopartikel magnetis ZnFe2O4 telah disintesis menggunakan metode presipitasi untuk degradasi rhodamine B dengan penyinaran cahaya UV dan cahaya tampak. Analisis pola difraksi sinar-X dan spektrum Fourier Transform Infrared (FTIR) menunjukkan pembentukan kubik spinel ZnFe2O4 dengan ukuran kristalit sekitar 13 nm. Spektrum absorpsi dalam rentang cahaya UV (200 nm) sampai cahaya tampak (~ 600 nm) dan celah energi 2,04 eV teramati dari pengukuran spektrofotometer UV-Vis. Sifat magnetik nanopartikel diukur menggunakan vibrating sample magnetometer (VSM) menunjukkan sifat magnet lemah yang sesuai untuk aplikasi magnetis fotokatalis. Nanopartikel ZnFe2O4 menunjukkan aktivitas fotokatalisis dengan cahaya UV maupun cahaya tampak untuk degradasi rhodamine B dengan konstanta laju reaksi 8,2 x 10-3 /menit dan 4,5 x 10-3/menit.]]>
