Yohandri Bow
Chemical Engineering Department, State Polytechnic of Sriwijaya, Palembang, 30139, Indonesia

Published : 4 Documents
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PREVENTION OF CORROSION RATE BY NATURAL INHIBITOR PAPAYA LEAF EXTRACT Bow, Yohandri
TEKNIK ENERGI Vol 3, No 1 (2012): Kinetika 01112012
Publisher : TEKNIK ENERGI

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Abstract

Corrosion is an event of damage or deterioration of a metal caused by reaction with the environtment. Corrosion process can be prevented by the addition of corrosion inhibitor. Papaya leaf extract is an organic material that could potentially be used as a corrosion inhibitor because it contains N-acetyl- glukosamida and amino acid. The purpose of this study is  to determine the effects of brine concentration and surface area on the rate of corrosion of a metal plate that can be used as reference incorrosion control on metal plate. Determination of corrosion rate use weight loss methods, with medium marinade variation 3.5%, 5% and 6.5% salt water and a sample of the iron plates of different sizes. Each concentration of the medium contained four samples with different sizes of iron plates immersed for 30 days. The results showed the highest corrosion rate found on a metal plate without inhibitor with a value of 0.1331 mm/ year . The  greater concentration of the medium the corrosion rate will be higher. The smaller surface area of iron plate the corrosion rate will be higher.
Treatment of Traditional Cloth Wastewater by Electrocoagulation Using Aluminum Electrodes Rusdianasari, Rusdianasari; Bow, Yohandri; Yuniar, Yuniar
International Journal on Advanced Science, Engineering and Information Technology Vol 4, No 2 (2014)
Publisher : International Journal on Advanced Science, Engineering and Information Technology

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Abstract

The existence of the textile industry in Indonesia is not only included in the category of large and medium scale industries, but also in small-scale and some even in the household (home industry). This led to the pollution caused by the textile industry, especially as a result of the presence of the textile dyeing not only occur in industrial areas but also occurs in densely populated settlements. To overcome the problem of environmental pollution that occurs, it needs treatment of the textile wastewater. Treatment of traditional cloth wastewater by electrocoagulation using aluminum electrode material has been investigated in this paper. The effect of relevant wastewater characteristics such as pH and conductivity, and important process variables such as applied voltage and operating time on the chemical oxygen demand (COD), biological oxygen demand (BOD), turbidity, total suspended solid (TSS) and total dissolved solid (TDS).  The processing time is used 60, 75, 90, 105, 120 minutes and for the variation of the applied voltage is 6 V, 12 V, 18 V, and 24 V. The best conditions and the effectiveness of electrocoagulation for each parameter varies with the voltage is in the range between 6 V– 18 V with the processing time between 90-120 minutes. The effectiveness of electrocoagulation method to decrease the turbidity value 99.634%; TSS 49.679%; TDS 17.243%; BOD 91.778%; COD 97.260% and to decrease the conductivity value of 23.631% and the increase in pH from 6.34 to 7.79.
Purification of Crude Glycerol from Biodiesel By-product by Adsorption using Bentonite Anzar, Erniati; Yusi, M. Syahirman; Bow, Yohandri
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 3, No 3 (2018): October 2018
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

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Abstract

The production of glycerol from biodiesel by-product that was obtained from waste cooking oil has low purity. This crude glycerol contains impurities such as methanol, catalyst, soap and water. Analysis result shows that crude glycerol contains 67.7% water, 16.7% ash with density 1.1217 g/mL. The impurities were able to be adsorbed using bentonite which was activated in sulphuric acids 1.5 M and characterized by SEM-EDX. The purified glycerol after being treated with bentonite at 60 C for 75 minutes was fulfilled The SNI 06-1564-1995 requirement i.e. 89.5% glycerol, 4.3% water, 3.6% ash and density 1.2212 g/mL. From the experiment can be concluded the activated bentonite showed a capacity in adsorbing and removing impurities in waste cooking oil.
Effect of DC Voltage on Prototype of Biodiesel Electrostatic Separator with Glycerin from Waste Cooking Oil Putra, Jaya Utama; Kalsum, Leila; Bow, Yohandri
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 3, No 3 (2018): October 2018
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

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Abstract

The limitations of fossil fuel support on fulfillment of energy need in a sustainable and environment friendly fashion has drove society to efforts of finding and developing fresh and renewably resources. Biodiesel is one the renewable energy resource and shows environment friendly property, consist of alkyl of fatty acids monoester originated from vegetable oil or animal fat.One of important steps in biodiesel production is separation of glycerin from product. Electrostatic method has been proved in accelerating saturation of glycerin. However, several aspects still need a careful assessment to acquire biodiesel production process with standard quality assigned. In this work, we designed an electrostatic separator of biodiesel from glycerin using waste cooking oil feed. The prototype was tested in several different voltages 12 Vdc, 20 Vdc, 30 Vdc and 33.5 Vdc. The result shows the highest voltage obtained is 33.5 Vdc, separation time 2 minutes 10 seconds having viscosity, water content and density i.e. 7.2139 cSt, 0.0321% and 0.85 g/mL respectively whereas flash point increase to 1917 C. The data confirmed that the product fulfills required standard value fordensity, water content and flash point.