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Neni Damajanti
Department of Chemical Engineering, Faculty of Engineering and Science, Universitas Muhammadiyah Purwokerto, Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Materials Science & Nanotechnology

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Reduction of Heavy Metal Levels (Pb and Fe) in Chemical Laboratory Wastewater by the Coagulation Method using Moringa Seeds Bio-coagulants (Moringa oleifera) Elia Trisnawati; Neni Damajanti
Research in Chemical Engineering Vol. 2 No. 2 (2023): Research in Chemical Engineering
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/rice.v2i2.90

Abstract

Chemical laboratory wastewater treatment is important because contains hazardous wastewater substance that pollute the environment if not treated properly. Instead of to Chemical Oxygen Demand (COD), Total Suspended Solid (TSS), and Biological Oxygen Demand (BOD) content, chemical laboratory wastewater also contains several types of heavy metals, such as Pb and Fe, which are infectious, pathological, and cytotoxic. One of the effective methods to treat the chemical laboratory wastewater is the coagulation-flocculation method with the addition of moringa seed powder bio-coagulant. The aim of this study was to determine the effect of coagulant dose and and precipitation time in reducing Pb and Fe metal levels in chemical laboratory wastewater. This study used variations in coagulant dose (1500, 2000, 2500, 3000, and 3500 mg/L) and precipitation time (20, 30, 40, 50, and 60 min). The result showed that the initial level of Pb and Fe in wastewater were 0.519 and 7.849 mg/L, respectively. The dose of 3000 mg/L of Moringa seed bio-coagulants showed the best concentration to reduce Pb level to 0.084 mg/L. On the other hand, at 3500 mg/L for reduction of Fe into 5.555 mg/L. The precipitation at 30 min showed the best time for reducing level both of Pb and Fe into 0.065 mg/L and 4.569 mg/L, respectively. However, the final level of Pb and Fe of wastewater after coagulation resulting in the below quality standard under The Minister of Environment Regulation Number 5 of 2014.
Utilization of Coffee Grounds as an Adsorbent in Reducing the Levels of Naphthol Dyes of Weaving Industry Wastewater Adlina Fitry; Neni Damajanti; Yeti Rusmiati Hasanah
Research in Chemical Engineering Vol. 3 No. 1 (2024): Research in Chemical Engineering
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/rice.v3i1.174

Abstract

Naphthol dye is one of the synthetic dyes contained in weaving industry waste. One method that can be used to reduce the disadvantageous effects of these substances is by adsorption using activated charcoal adsorbent from coffee grounds. This research aims to determine the character of activated charcoal from coffee grounds and the effect of adsorbent dosage and stirring time on the adsorption of naphthol dye levels. Making activated charcoal from coffee grounds goes through 3 stages, namely the dehydration stage, carbonization stage at 350 oC for 3.5 hours, and activation stage using a 0.1 M HCl activator for 48 hours. The characterization of activated charcoal obtained complies with SNI 06-3730-1995 with results of water content of 3.74%, ash content of 2.12%, and iodine adsorption capacity of 758.29 mg/g, and functional group testing was carried out by varying the adsorbent dosage at 0.125; 0.250; 0.500; 0.750; 1 g (per 100 mL sample) and stirring time for 10; 20; 30; 40; 50 minutes. From the research results, it was obtained the best adsorbent dose and mixing time were 0.5 g and 40 minutes with adsorption efficiency of 98.68% and 99.63%.
Extraction and Characterization of Pectin from Snake Fruit Peel via Maceration Raafi Akbar Putra Purnomo; Yeti Rusmiati Hasanah; Neni Damajanti
Research in Chemical Engineering Vol. 3 No. 2 (2024): Research in Chemical Engineering
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/rice.v3i2.210

Abstract

The high consumption of fruit flesh from the snake fruit is not in line with the utilization of fruit peels, which are often considered organic waste that goes to waste. The lack of optimal utilization of fruit peels as organic waste can open up opportunities to develop other alternatives, such as using fruit peels as a source of pectin. The extraction of pectin from fruit peels is carried out using the maceration extraction method with citric acid as the solvent. This research aims to determine the effect of the solvent material ratio and solvent concentration, as well as to understand the characteristics of the resulting pectin product. The results of this study indicate that among the variations in the ratio of materials and solvents, the highest %yield was achieved at a ratio of 1:40 (gr/mL) with a %yield value of 13.15%. In the variations of solvent concentration, the highest pectin %yield was at a concentration of 10% with a %yield value of 17.5%. The characteristics of the produced pectin were the highest equivalent weight of 114.94 mg, the highest methoxyl content of 9.92%, and the highest galacturonic acid content of 1063.04%. Functional group analysis using FTIR showed the presence of the O-H functional group at a wavelength of 3255 cm-1, the aliphatic C-H functional group at a wavelength of 2808 cm-1, the carboxyl (C=O) functional group at 1838 cm-1, and the methyl C-H functional group at a wavelength of 1442 cm-1. Therefore, the best research results were found at 1:40 and a solvent concentration of 10% with the highest %yield, equivalent weight, methoxyl content, and galacturonic acid content
Co-Authors Adlina Fitry Elia Trisnawati Raafi Akbar Putra Purnomo Yeti Rusmiati Hasanah