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Journal of Enviromental Engineering and Sustainable Technology

JEEST
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Published by Universitas Brawijaya

ISSN : 23563117 EISSN : 23563109 DOI : -

Core Subject : Social,

Environmental Science

JEEST is an interdisciplinary and refereed journal, addresses matters related to environmental engineering and sustainable technology. Its range of themes encompasses ecological studies, field research, empirical work and descriptive analyses on topics such as environmental systems, environmental policies and politics, environmental legislation, environmental impact assessment, air, water and land pollution, water and energy related issues, engineering innovations, development, technical solutions and sustainability technology. Other matters related to or which influence the international debate on sustainability will be also considered.

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Articles 5 Documents

Search results for , issue "Vol 5, No 1 (2018)" : 5 Documents clear

FAULT DETECTION AND PROTECTION METHOD ON LOW VOLTAGE DC MICRO-GRID SYSTEM Sholeh Hadi Pramono; Eka Maulana; Hadi Suyono; Akhmad Zainuri
Journal of Environmental Engineering and Sustainable Technology Vol 5, No 1 (2018)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Brawijaya

ABSTRACTMicro-grid architecture is designed for small scale model in Brawijaya University area in order to change conventional AC-based electricity system previously. Low voltage direct current (LVDC) levels are proposed and charactized to obtain the optimal design of the DC grid system. Some parameters related to the electrical phenomenon of voltage, current and power which occur in distributed-generation, distribution grid, and load sites were also analyzed. Detailed model of photovoltaic (PV) and PMSG was implemented with operational analysis and simulated with study case modes to achieved the power and system efficiency. DC bus is conducted to accommodate the distribution power between PV generation, battery and super capacitor for energy sorage element, distributed-load and other grid utilization.Various condition and operation have been characterized toward stability performance of the voltage and current of 12-36 volts and 0-20 A DC, respectively. This architectural design can be utilized to develop an actual design and small scale implementation of the LVDC smart micro-grid system.Keywords: Fult Detection Protection Micro-grid Low Voltage DC

THE USE OF CITRIC ACID MODIFIED BACTERIAL CELULLOSE AS AN ENVIROMENTALLY FRIENDLY ADSORBENT Diah Mardiana; Ani Mulya Suryani; Budi Kamulyan; Nur Lailatul Rahma
Journal of Environmental Engineering and Sustainable Technology Vol 5, No 1 (2018)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Brawijaya

AbstractThe use of nata de coco as an ester cellulose raw material through esterification using various of carboxylic acids has been widely conducted. In this study, it was used citric acid with three carboxyl groups. This aim research were to determine the optimum reactant composition and to compare the cellulose citrate properties toward bacterial cellulose and commercial ester cellulose. Esterification at mass ratio of nata : citric acid were 1 : 1 up to 1 : 9 were conducting at temperature of 150oC. The optimum ester cellulose produced, were then characterized based on the FTIR spectrophotometry, hydrophobicity and degree of crystallinity. Furthermore, the surface area has been determined in order to find out its potency as an adsorbent .The result revealed that reaction using citric acid has affect on chemical structure and hydrophobicity. The increase of hydrophobicity and degree of crystallinity was influenced by citric acid added. On the other hand, it was obtained that cellulose citrate could be develop as an adsorbent.Keyword: cellulose, esterification, citric acid, adsorbent

ONE DIMENSIONAL SIMULATION OF DC BIASED ARGON PLASMA USING COMSOL MULTIPHYSICS Dionysius Joseph Djoko Herry Santjojo
Journal of Environmental Engineering and Sustainable Technology Vol 5, No 1 (2018)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Brawijaya

The character of a argon plasma in a DC biased reactor was simulated using 1-dimensional model. The model and simulation was carried out using COMSOL multiphysics software. Results of the simulation show that the model and can be used to predict the character and state of the Ar plasma such as distribution of electron density and Ar+ ion, electron temperature, and electric potential in the plasma space. Furthermore, the model predicts that the argon plasma is formed near the cathode (r<0.5 cm) at the end of the simulation. And, the higher the pressure the higher the plasma density produced at pressures less than 100 Pa.

SOIL DRIVE NUTRIENT AS NEW METHOD FOR TIN MINING REMEDIATION Anton Muhibuddin
Journal of Environmental Engineering and Sustainable Technology Vol 5, No 1 (2018)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Brawijaya

A contaminated soil by tin usually is a big problem in Indonesia. Uniformity is essential for processing soil at a normal quality and to ensure conformity to specify clean up levels. Revegetation efforts were carried out by using rubber and jatropha combination which infected by arbuscular mycorrhizal (VAM) fungi applied using the soil drive nutrient (SDN) method showed good result in the previously research.This research purposes to know the effectivity of soil drive nutrient (SDN) method to promote the growth of soybean plants (Glysine max L.) in tin mining soil. The results showed that the cropping pattern and dose of mycorrhizal gave effect on soybean growth, especially on the trunk diameter. Result also showed that mycorrhizal infection on soybean roots significantly influenced by the SDN method and dose of mycorrhizal that applied. Both of these are expected to have a positive impact on soybean production and resistance to environmental stress and disease attack. Viceversa, height and number of plant leaves untill 28 days were not affected by the SDN method and the dose of mycorrhiza applied.

METHOD OF ANALYSIS FOR DETERMINATION OF THE CHROMIUM (Cr) SPECIES IN WATER SAMPLES BY SPECTROPHOTOMETRY WITH DIPHENYLCARBAZIDE Adam Wiryawan; Rurini Retnowati; Perry Burhan; Syekhfani Syekhfani
Journal of Environmental Engineering and Sustainable Technology Vol 5, No 1 (2018)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Brawijaya

Speciation of Chromium (Cr) is very important because of the toxicity of these metals depending on the oxidation number and its concentration is very low in the water system. Chromium occurs in the environment primarily in two valence states, trivalent Cr(III) and hexavalent Cr(VI). Chromium (III) is an essential micro-nutrients for the human body, while the Cr(VI) is highly toxic and carcino-gennic. Chromium(VI) in the water can be analyzed by spectrophotometry with diphenylcarbazide as reagent on pH=1 at maximum wavelength of 540 nm. The experimental result show that Cr(VI) can be analyzed using diphenylcarbazide in the concentration of 0.0015% and H3PO4 solution as acidic in 0.03 mol/L. The absorbance was measured at minutes 5 after preparation. There is interference from ion Fe(III) at least 6.0 ppm and this interference can be overcome by using 0.3 % NaF solution. The limit of detection of this method is -samples, mix of Cr(III) and Cr(VI), can be analyzed by using this method without oxidation by KMnO4 solution. While Cr(III) in the artificial samples, mix of Cr(III) and Cr(VI), can be analyzed by using this method via oxidation by KMnO4 solution in the acidic media (H2SO4), the result of this analysis is the total concentration of Chromium. The concen-tration of Cr(III) can be calculate via subtract the total of Cr concentration by concentration of Cr(VI).Keywords: speciation, Cr(III), Cr(VI), spectropho-tometry, diphenylcarbazide, Fe(III), interference.

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