Garuda - Garba Rujukan Digital

Activated Carbon Fixed-Bed Adsorber Design for Treating Chromium Hexavalent Wastewater Hudaya, Tedi; Rachmat, Velicia
Makara Journal of Technology Vol. 22, No. 3
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Pollution caused by industrial wastewater containing heavy metals is a major issue, primarily due to its toxic nature. A cheap yet effective method to deal with such wastewater is activated carbon adsorption. The purpose of this research is to evaluate and design a fixed bed adsorber with granular activated carbon as an adsorbent to process wastewater-containing chromium hexavalent (Cr 6+). Experiments show that the Langmuir isotherm fits the equilibrium data as effectively as the Freundlich isotherm. Activated carbon used in this research is Jacobi 2000® derived from bituminous coal. The lab scale inlet volumetric flow is 100 mL/h with different Cr6+ concentration for each run, 20 and 35 ppm respectively. Based on scale-up calculation with Length of Unused Bed (LUB) method, for superficial flow of 400 L.m-2.min-1 and service time of six months, the column dimensions for inlet concentration of 20 ppm are 0.62 m diameter and 2.33 m height with 1.87 m carbon bed depth. Concurrently, a slightly bigger column (0.63 m diameter and 2.37 m height column with 1.89 m carbon bed) is necessary for treating inlet concentration of 35 ppm.

Pengolahan Limbah Warna DYA Industri Pencelupan Tekstil dengan Teknologi UV / H2O2/ TiO2 Hudaya, Tedi; Tunardi, Stephen Reinaldo; Octaviany, Octaviany
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

Show Abstract | Download Original | Original Source | Check in Google Scholar

Textile wastewater often contains non-biodegradable as well as toxic dyes, for example Dianix Yellow Ace (DYA). One possible destructive method of treating such waste treatment is the Advance Oxidation Processes (AOPs), in which the oxidation of organic compounds by potent hydroxyl radicals (● OH) occurs. This research had a novelty of combining UV / H2O2 with UV / TiO2 to study the effect of treatment process’ variables, i.e. [H2O2], [TiO2] and initial pH on the rate of degradation as well as the ratio of BOD / COD until biodegradability threshold was reached. This research employed a Central Composite Design (CCD) experimental design technique that used factorial design and included center points as well as axial points for better accuracy and understanding of the process. CCD helped create a response surface model for optimization and prediction. The variations were the concentration of H2O2 between 0.01 - 1.00 %w, TiO2 concentrations ranging from 0.80 to 3.00 g.L-1 and initial pH between 1 - 11. The order and reaction rate constants were also determined by measuring the DYA concentrations using a spectrophotometer. The optimum condition for DYA degradation was found at pH 3, 0.2% H2O2 and [TiO2] 3 g.L-1 with a pseudo first-order rate constant of 0.0524 min-1. UV irradiation around 75 minutes resulted in DYA removal of 99%. The wastewater fell into the biodegradable limit after 60 minutes treatment, with a value of BOD / COD ratio was 0.1029 so that the wastewater became biodegradable to be further treated by much cheaper biological method.

Exploration of Biomimetic Metal-Organic Catalysts for Splitting Glucose into Dihydroxyacetone and Glyceraldehyde Sumargo, Margaretha; Audreylia, Vanessa; Luivan, Samuel; Susanti, Maria Patrycia Della; Soerawidjaja, Tatang Hernas; Hudaya, Tedi
Journal of Engineering and Technological Sciences Vol. 57 No. 2 (2025): Vol. 57 No. 2 (2025): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.2.1

Lactic acid is a metabolite produced during glucose glycolysis, typically generated industrially through the fermentation of glucose using microorganisms. However, the high production cost of this fermentation process makes lactic acid relatively expensive, rendering biodegradable plastics made from polylactic acid less competitive. This research focuses on the initial stages of glucose glycolysis process, in which glucose is split into dihydroxyacetone and glyceraldehyde, both of which are isomers of lactic acid. Biomimetic metal-organic catalysts composed of Mg-Zn tripolyphosphate, imidazole, and monosodium or monoammonium glutamate were tested in a water–acetonitrile reaction medium. Prior to catalyst testing, either water–acetonitrile or water–acetonitrile–acetone solutions were chosen as the reaction medium based on their effectiveness in producing phase separation. The study investigated the effects of catalyst concentrations, catalyst types, and reaction temperatures on glucose conversion, as well as the yield and selectivity of dihydroxyacetone and glyceraldehyde within 6 hours reaction time at pH 8. The results showed that these biomimetic metal-organic catalysts effectively facilitated the splitting of glucose in a water–acetonitrile solution, achieving the best glucose conversion of 57.16% at a temperature of 90°C with a catalyst concentration of 0.8%-mol.

Simulation of the Effect of Flow Ratio on Methyl Caproate Composition in Fractionated Methyl Ester Based on Palm Kernel Oil Tandra, William; Bisowarno, Budi Husodo; Hudaya, Tedi
Journal of Social Research Vol. 4 No. 7 (2025): Journal of Social Research
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/josr.v4i7.2648

This research consists of five steps, first is literature review and Aspen Plus simulator review, this review step will not only provide initial data and assumptions, but also provide which thermodynamics data suitable to be used in Aspen Plus for this research. Second step is the data collection step, the data collected from actual recorded data such as temperature, pressure, and flow rate from one of oleochemicals plants in the June 2023 period complete with the analysis results. The data and analysis results are collected from several days in the month and selected based on normal running conditions of the plant without any interruptions. Third is the process modeling with Aspen Plus simulator using the data collected from literature review and actual plant data. Fourth step is validation of the process model using actual plant data with different modes. The last step is simulation of the process using the valid model to predict the product composition based on predetermined process parameter variation. Based on the actual plant data, valid model obtained using RadFrac Unit Operation, with reflux ratio 150, stage count at 32 stages, and feed stage at stage 23. Process parameter variation used in the simulation are reflux ratio and side product flow ratio with +/- 10% range. Based on the simulation result, reflux ratio affects methyl caproate product composition more than side product flow ratio in first methyl ester fractionation column. This model has the potential to be implemented in the plant to predict the methyl caproate composition in case of feed composition changes or deviation on the product composition itself.

Pengolahan Limbah Warna DYA Industri Pencelupan Tekstil dengan Teknologi UV / H2O2/ TiO2 Hudaya, Tedi; Tunardi, Stephen Reinaldo; Octaviany, Octaviany
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

Show Abstract | Download Original | Original Source | Check in Google Scholar

Textile wastewater often contains non-biodegradable as well as toxic dyes, for example Dianix Yellow Ace (DYA). One possible destructive method of treating such waste treatment is the Advance Oxidation Processes (AOPs), in which the oxidation of organic compounds by potent hydroxyl radicals (● OH) occurs. This research had a novelty of combining UV / H2O2 with UV / TiO2 to study the effect of treatment process’ variables, i.e. [H2O2], [TiO2] and initial pH on the rate of degradation as well as the ratio of BOD / COD until biodegradability threshold was reached. This research employed a Central Composite Design (CCD) experimental design technique that used factorial design and included center points as well as axial points for better accuracy and understanding of the process. CCD helped create a response surface model for optimization and prediction. The variations were the concentration of H2O2 between 0.01 - 1.00 %w, TiO2 concentrations ranging from 0.80 to 3.00 g.L-1 and initial pH between 1 - 11. The order and reaction rate constants were also determined by measuring the DYA concentrations using a spectrophotometer. The optimum condition for DYA degradation was found at pH 3, 0.2% H2O2 and [TiO2] 3 g.L-1 with a pseudo first-order rate constant of 0.0524 min-1. UV irradiation around 75 minutes resulted in DYA removal of 99%. The wastewater fell into the biodegradable limit after 60 minutes treatment, with a value of BOD / COD ratio was 0.1029 so that the wastewater became biodegradable to be further treated by much cheaper biological method.

Title

Found 5 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 5 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 5 Documents
Search